4rth AI Terms of Service

These terms cover paid and free use of 4rth worldwide, including building apps with AI and hosting them.

Last updated: October 8, 2026 · Version: 1.0

IMPORTANT: SECTION 13 CONTAINS A BINDING ARBITRATION AGREEMENT AND CLASS ACTION WAIVER THAT APPLY TO USERS IN THE UNITED STATES, EXCEPT WHERE PROHIBITED BY LAW.

1. Agreement, eligibility and accounts

1.1 Agreement. These Terms of Service ("Terms") are a contract between you and 4rth AI, Inc., a Delaware corporation, 4 Palo Alto Square, 3000 El Camino Real, Suite 200, Palo Alto, CA 94306, USA ("4rth", "we", "us"). They govern your use of the 4rth website, app builder, AI features, hosting and related services (the "Service"). By ticking the acceptance box at checkout, creating an account, or using the Service, you agree to these Terms, our Privacy Policy, our Acceptable Use Policy and, where you process personal data through the Service, our Data Processing Addendum. Those documents form part of these Terms.

1.2 Business or consumer. If you use the Service for an organization, you agree on its behalf and confirm you have authority to do so; "you" then means that organization. If you are a consumer, some sections apply differently where your local law requires, as noted below. Nothing in these Terms limits rights you have under mandatory consumer law.

1.3 Eligibility. You must be at least 18, or the age of majority where you live if higher, and able to form a binding contract. You may not use the Service if you are barred under applicable law, including sanctions laws (Section 15).

1.4 Accounts. You must give accurate information, keep your login details secure, and tell us promptly at security@4rth.ai about any unauthorized use. You are responsible for everything that happens under your account, including activity by team members you invite. One person or organization may not create multiple free accounts to obtain extra credits or limits.

1.5 Definitions.

App: software, websites or content you create, edit or publish with the Service.
Live App: an App published and hosted by 4rth at a 4rth subdomain or your own domain.
End User: anyone who visits or uses one of your Live Apps.
Your Content: prompts, instructions, files, code, data and other material you or your End Users submit to the Service, and the Output generated for you.
Output: code, text, images and other material generated by AI features for you.
AI Credits: units that pay for AI processing, as described in Section 2.
Shared Credits: AI Credits that pay for building and editing Apps and, once Run Credits are used up, for AI features in Live Apps. They include free credits and top-up credits.
Run Credits: a monthly allowance of AI Credits for AI features in your Live Apps.
Plan: the Starter plan.

2. The Service, credits and hosting

2.1 What we provide. The Service lets you build Apps with AI, edit them, and publish them as Live Apps hosted by 4rth. Features, limits and prices for each Plan are shown on our pricing page or in the Service at the time you buy, which forms part of these Terms.

2.2 AI Credits. AI Credits pay for AI processing. The number of credits an action uses depends on its complexity and AI usage, and is deducted when the work is done. Estimates such as "about 2 medium apps" are illustrations, not guarantees.

Shared Credits pay for building and editing your Apps, and for AI features in your Live Apps once your Run Credits are used up. Credits used by your Live Apps come from the App owner's account, not the End User's.
Free credits are given once when you sign up. They are Shared Credits and do not expire while your account is open, except as Section 2.11 provides.
Top-up credits you buy are Shared Credits and do not expire while your account is open (Section 2.12).
Run Credits are a monthly allowance, per account, for AI features in your Live Apps, as shown on our pricing page or in the Service. They are shared across all your Apps, cannot be used for building or editing, expire at the end of each month, do not roll over, have no cash value, and may be changed or ended at any time.
Credits are used in this order: Run Credits (Live Apps only), then free credits, then top-up credits.
We warn you in the Service and by email when your credits are running low. When your Shared Credits run out, building pauses and we invite you to top up. AI features in your Live Apps pause once your Run Credits are also used up; the Apps otherwise stay online.

2.3 Credits have no cash value. AI Credits are a limited license to use the Service. They are not money, property or a stored-value instrument, cannot be transferred, sold or exchanged for cash, and are forfeited when your account is closed, except where law requires otherwise. We may change how many credits an action uses, with notice for material changes.

2.4 Hosting and limits. Each Plan includes hosting limits, such as live apps, bandwidth and storage, shown on our pricing page or in the Service. Bandwidth resets monthly; storage is the total you keep at any time. If you exceed a limit, we will notify you and may give a grace period. After that we may slow traffic, pause new uploads, or pause AI features until you reduce usage. We may also take other reasonable steps to protect the Service.

2.5 Fair use. "Unlimited" features are subject to fair use to protect the Service for everyone. We may set and change limits on live apps, publishing, requests, AI usage, file sizes and other resources at any time, and may enforce them as we reasonably decide.

2.6 Starter plan. The Starter plan is provided as is and may be changed, limited or withdrawn at any time. Live Apps on the Starter plan are not guaranteed to stay online continuously and may be paused when idle or after inactivity. We may remove inactive Starter accounts and their content.

2.7 Changes to the Service. We may add, change or remove features. Features, limits and credit usage may change over time.

2.8 Beta features. Features marked beta, preview or experimental are provided as is, may change or end without notice, and are excluded from any support commitments.

2.9 Subdomains and usernames. 4rth owns the 4rth subdomains we provide for Live Apps, and you receive only a right to use them while your account is in good standing. We may reclaim or change a subdomain or username that is inactive, misleading, infringing, impersonating someone, or otherwise in breach of these Terms. No refund or compensation is due when we do.

2.10 Our records. Our records of credit balances, usage, bandwidth and storage are final and binding, absent manifest error. Credits carry no interest.

2.11 Promotional credits. Free, bonus, referral or promotional credits may expire sooner, have conditions, and be withdrawn if obtained through abuse. They have no cash value and are never refundable.

2.12 Inactive balances. Top-up credits remain available while your account is open and active. If your account has no sign-in for 24 months, we may close it and any remaining credits expire, after notice by email, except where law requires otherwise.

3. Payment and top-ups

3.1 Prices and taxes. Prices are shown in USD unless stated otherwise. Prices exclude taxes unless the checkout says they are included. If you provide a valid business tax ID, reverse-charge rules may apply and you are responsible for self-assessing the tax. You pay all applicable sales, use, VAT, GST and similar taxes, which we collect where required based on your billing location. Your bank may charge currency conversion or foreign transaction fees.

3.2 Price changes. We may change top-up prices at any time. A change does not affect credits you have already bought.

3.3 Top-ups. Top-up credits are one-time purchases charged when bought. They are added to your Shared Credits, are shared across all your Apps, do not expire while your account is open (Section 2.12), and are non-refundable, except as Section 3.5 or applicable law provides.

3.4 Failed payments. If a payment fails, no credits are added to your account. We may refuse repeated failed payment attempts.

3.5 Refunds. Payments are non-refundable and we do not give refunds for unused credits, except where this section or applicable law says otherwise, or where we decide to at our discretion. We refund charges made in error, such as a duplicate charge, if you tell us at billing@4rth.ai within 60 days of the charge.

3.6 Right of withdrawal (EU, EEA, UK and similar). If you are a consumer in a country that gives you a right to withdraw from online contracts, you may withdraw within 14 days of buying credits, if you have not used them. By ticking the box at checkout, you ask us to make the credits available immediately and acknowledge that you lose your right of withdrawal for credits once you start using them. If you withdraw in time, we will refund the credits you have not used.

3.7 Chargebacks. Please contact us at billing@4rth.ai before disputing a charge with your bank; most problems are fixed faster that way. If you dispute a charge, we may give your bank records of the purchase, your acceptance of these Terms at checkout, your sign-ins and the credits you used, and we may suspend your account while the dispute is open. If the dispute is decided in your favour, we will remove any unused credits from that purchase. If you dispute a valid charge, we may close your account, and you still owe the amount.

3.8 Fraud and refused orders. We may refuse or cancel a purchase, or remove credits, if we suspect fraud, use of a payment method without permission, or abuse of offers. If we cancel a purchase, we refund it to the original payment method.

4. Your content, AI and your apps

4.1 You own your content. As between you and 4rth, you own Your Content, the data stored in your Apps, and your App blueprints. Apps run on 4rth's proprietary runtime: the generated pages, specifications, action plans, templates and runtime that make an App work are 4rth materials, licensed to you for use on the Service while your account is active, and Apps cannot run outside the Service. You give us a worldwide, non-exclusive, royalty-free license to host, store, copy, process, display and transmit Your Content only as needed to provide, secure and support the Service, comply with law, and enforce these Terms. This hosting license ends when Your Content is deleted from our systems, except for backups kept for a limited period and the training license in Section 4.2. You confirm that you have the rights needed to Your Content and that it does not violate the law or anyone else's rights.

4.2 Training. You give us a worldwide, perpetual, irrevocable, royalty-free license to use de-identified and aggregated data derived from Your Content and your use of the Service, such as app structures, design patterns and usage statistics, to operate, analyze and improve the Service, including to develop and train AI models. Before we use data this way, we remove information that identifies you or any other person. We do not use your personal information, or the personal data of your End Users, to train AI models. Training use does not give anyone else access to Your Content.

4.3 Output. AI Output may be inaccurate, incomplete, insecure or similar to output generated for others, and may not be protectable by copyright in some countries. You are responsible for reviewing, testing and securing Output and your Apps before relying on or publishing them, including checking for bugs, security issues, and third-party rights in any code, images or text. Output generated for others is not Your Content. Credits are consumed for AI processing whether or not you are satisfied with the Output.

4.4 Third-party AI providers. AI features are powered by third-party AI model providers. When you build an App, and when your Live Apps run AI features, the content involved, including prompts, files and data submitted by End Users, is sent to these providers to generate a response. They process this content under their agreements with 4rth. We do not sell Your Content.

4.5 Your Live Apps and End Users. You are responsible for your Apps, their content, and how they collect and use End User data. For End User personal data, you are the controller and 4rth is your processor, under our Data Processing Addendum. You must:

provide End Users with a privacy notice and any terms your App needs;
tell End Users that their inputs to AI features may be processed by third-party AI providers;
obtain any consents required by law in your End Users' locations and your industry;
not send sensitive data (such as health, financial, biometric or government ID data, or data of children) through AI features or store it in your Apps unless you have a separate written agreement with 4rth that allows it; and
handle End User requests and complaints about your App.

4.6 Platform notices. Because we host Live Apps, we may display a notice next to AI features and an "AI disclosure" link in your Live Apps explaining that inputs are processed by third-party AI providers. You may restyle these notices but may not remove or hide them.

4.7 Your domains and integrations. If you connect a custom domain, third-party API or service to your App, you are responsible for your rights to use it and for complying with its terms. We are not responsible for third-party services.

4.8 Your App's legal compliance. You are solely responsible for making sure your Apps comply with laws that apply to them, including privacy, consumer protection, e-commerce, advertising, accessibility, employment and sector-specific laws, and for any terms, notices and policies your App needs.

4.9 Regulated and high-risk uses. The Service is not designed for, and you may not use it for, (a) health information regulated by HIPAA or similar laws (we do not sign business associate agreements), (b) storing payment card numbers or data covered by PCI DSS, (c) government ID, biometric or other special-category data, or (d) uses where failure could cause death, injury or serious harm, such as medical, emergency, aviation or critical infrastructure systems, unless we agree otherwise in a signed written agreement.

4.10 Apps for children. You may not build Apps directed to children under 13, or under the age of digital consent where you operate, unless you comply with all applicable laws (such as COPPA and GDPR) and we have agreed in writing.

4.11 AI transparency. Where law requires (for example, the EU AI Act), you must tell End Users when they are interacting with AI or seeing AI-generated content. You may not present AI Output as human-written where that would mislead, or remove notices we display for this purpose.

4.12 Payments and keys in your Apps. If your App accepts payments or uses third-party API keys, you do so under your own accounts and agreements unless additional terms for a feature say otherwise. Except as those terms say, 4rth is not a party to, and has no liability for, transactions between you and your End Users. Some features, such as payments, have additional terms that apply when you use them and form part of these Terms.

4.13 Monitoring and review. We may use automated and human review of prompts, Apps and Live Apps to operate the Service, detect abuse, enforce these Terms and comply with law. We are not obligated to monitor, and we may refuse to build or publish any App, or remove any content, at our discretion.

5. Acceptable use

You may not use the Service, or let your Apps or End Users use it, to:

break any law, or infringe anyone's intellectual property, privacy or other rights;
build or host phishing pages, impersonation sites, fake login, payment or support flows, scams, or fraudulent reviews or records;
distribute malware, run crypto mining, send spam, or attack, scan or overload any system;
host sexual content involving minors, non-consensual intimate imagery, content that promotes terrorism or violent extremism, or targeted harassment;
make high-risk decisions about people (credit, employment, housing, insurance, medical or legal decisions) using AI Output without appropriate human review and legal compliance;
use AI features to create weapons, or to generate content our AI providers' usage policies prohibit;
resell, sublicense or provide the Service itself as a standalone AI or hosting service, or share accounts to avoid paying;
create multiple accounts, automate sign-ups, or otherwise abuse free credits or limits;
reverse engineer the Service, extract our models, prompts or system instructions, or use the Service to build a competing product; or
get around security measures, usage limits, rate limits or platform notices.

The full Acceptable Use Policy adds detail and examples.

6. Suspension and termination

6.1 By you. You can stop using the Service and close your account anytime in Settings.

6.2 By us. We may suspend or remove an App, or suspend or terminate your account, if you materially breach these Terms, fail to pay, create a risk to the Service, End Users or others, or if we must do so by law. Where reasonable, we will give notice and a chance to fix the problem first. We may act immediately for serious abuse, illegal content, security threats or legal orders. We may also end your account for any reason with reasonable notice. If we terminate for your breach, unused credits are forfeited and no refund is due.

6.3 Ending the Service. We may stop offering the Service, or any Plan or feature, at any time. Where we end the Service entirely, we will give reasonable notice and refund the unused value of credits you bought.

6.4 Your data after termination. After your account ends, Live Apps go offline. Export, where available, is limited to App blueprints and does not include data stored in your Apps. We may give you a limited period to export, but are not required to. We may then delete Your Content, except where the law requires us to keep it.

6.5 What survives. Sections on payment owed, ownership, disclaimers, limitation of liability, indemnity, disputes and any other terms that by their nature should continue survive termination.

7. Privacy, security and data transfers

7.1 Privacy. Our Privacy Policy explains how we handle personal data about you. Our Data Processing Addendum applies when we process personal data for you, including End User data in your Live Apps.

7.2 International transfers. We and our providers may process data in the United States and other countries. Where required, we use lawful transfer mechanisms, such as the EU Standard Contractual Clauses and the UK Addendum.

7.3 Security. We use reasonable technical and organizational measures to protect the Service. No system is perfectly secure. You are responsible for the security of your Apps' code, configuration, credentials and API keys, and for backups you need beyond what the Service provides. We will notify you of a security incident affecting your personal data as required by law.

7.4 Backups and data loss. We make backups for our own disaster recovery, not as a service to you. We do not guarantee that Your Content or App data can be recovered. You are responsible for keeping your own copies of anything you cannot afford to lose.

7.5 Legal requests. We may access, preserve and disclose Your Content and account information if we believe in good faith it is reasonably necessary to comply with law or legal process, protect anyone's safety, or protect 4rth's rights. Where lawful and practical, we will tell you first.

8. Intellectual property and feedback

8.1 Our property. The Service, including our software, models, prompts, templates, designs and trademarks, belongs to 4rth and its licensors. These Terms give you a limited, non-exclusive, non-transferable right to use the Service while your account is active. Templates and starter code we provide may be used in your Apps.

8.2 Third-party and open-source software. Generated Apps may include open-source components under their own licenses. You are responsible for complying with those licenses in your Apps.

8.3 Feedback. If you send us ideas or feedback, we may use them without obligation to you. If you use the Service for business, we may list your name and logo as a customer; you can ask us to stop at any time.

9. Copyright and content complaints

If you believe content hosted on the Service infringes your copyright or is illegal, send a notice to legal@4rth.ai with the details required by applicable law, including the US Digital Millennium Copyright Act and the EU Digital Services Act. We may remove content, notify the App owner, and accept counter-notices. We terminate the accounts of repeat infringers where appropriate. Anyone can report illegal or abusive content, including in Live Apps, at contact@4rth.ai. When we restrict content or an account, we will give the affected user a statement of reasons where required by law, and you can appeal by replying to that notice. Our point of contact for the EU Digital Services Act is dsa@4rth.ai.

10. Availability and disclaimers

10.1 Availability. We aim to keep the Service and Live Apps available, but we do not promise uninterrupted or error-free operation. "Always online" means your Live Apps are kept published and reachable while your account is in good standing; Apps may sleep when idle and take a few seconds to wake, and may be unavailable during maintenance, outages or events outside our control. No service level agreement applies unless agreed in writing. The Service depends on third-party hosting, infrastructure and AI providers, and we are not responsible for interruptions or changes caused by them.

10.2 Disclaimer. EXCEPT AS EXPRESSLY STATED IN THESE TERMS, THE SERVICE, AI OUTPUT AND HOSTING ARE PROVIDED "AS IS" AND "AS AVAILABLE". TO THE FULLEST EXTENT PERMITTED BY LAW, 4RTH DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT AND ACCURACY. WE DO NOT WARRANT THAT OUTPUT OR APPS WILL BE CORRECT, SECURE, LAWFUL OR FIT FOR YOUR PURPOSE.

11. Liability and indemnity

11.1 Limitation of liability. TO THE FULLEST EXTENT PERMITTED BY LAW, 4RTH AND ITS AFFILIATES, SUPPLIERS AND PERSONNEL WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY OR PUNITIVE DAMAGES, OR FOR LOST PROFITS, REVENUE, DATA, GOODWILL OR BUSINESS OPPORTUNITIES, ARISING FROM OR RELATED TO THE SERVICE, EVEN IF ADVISED OF THEIR POSSIBILITY. WE ARE NOT LIABLE FOR AI OUTPUT, YOUR APPS OR THEIR USE, CLAIMS BY YOUR END USERS, LOSS OR CORRUPTION OF DATA, SECURITY BREACHES OF YOUR APPS, OR ACTS AND OUTAGES OF THIRD-PARTY PROVIDERS.

11.2 Cap. OUR TOTAL LIABILITY FOR ALL CLAIMS RELATED TO THE SERVICE WILL NOT EXCEED THE GREATER OF (A) THE AMOUNTS YOU PAID US IN THE 12 MONTHS BEFORE THE EVENT GIVING RISE TO THE CLAIM AND (B) US$100. IF YOU HAVE NOT BOUGHT ANY CREDITS, OUR TOTAL LIABILITY IS LIMITED TO US$50. THESE LIMITS APPLY TO ALL CLAIMS TOGETHER, UNDER ANY THEORY OF LIABILITY, AND ARE AN ESSENTIAL BASIS OF OUR PRICING.

11.3 What we don't exclude. Nothing in these Terms excludes or limits liability for death or personal injury caused by negligence, fraud, gross negligence or willful misconduct, or any liability that cannot be limited by law. If you are a consumer in the EU, EEA or UK, we are liable for foreseeable loss caused by our breach of these Terms or our failure to use reasonable care and skill, and Sections 10.2 and 11.1 apply only as far as your local law permits.

11.4 Indemnity. If you use the Service for business, you will defend and indemnify 4rth against third-party claims, losses and costs (including reasonable legal fees) arising from your Apps, Your Content, your End Users' use of your Apps, your breach of these Terms, or your violation of law or third-party rights. We will notify you of a claim promptly and let you control its defense, provided you do not settle without our consent.

11.5 Time to bring a claim. To the extent permitted by law, any claim related to the Service must be brought within one year after it arises, or it is permanently barred.

12. Governing law and disputes

12.1 Governing law. These Terms are governed by the laws of the State of Delaware, USA, without regard to conflict-of-law rules. If you are a consumer outside the United States, you also keep the protection of mandatory laws of your country of residence, and you may bring claims in your local courts.

12.2 Informal resolution. Before starting a formal dispute, contact us at legal@4rth.ai and give us 30 days to try to resolve it.

13. Arbitration and class action waiver (United States)

13.1 Arbitration. If you live in the United States, any dispute that is not resolved informally will be settled by binding individual arbitration administered by the American Arbitration Association under its applicable rules, instead of in court, except that either party may bring an individual claim in small claims court or seek an injunction for misuse of intellectual property.

13.2 Class action waiver. YOU AND 4RTH MAY BRING CLAIMS ONLY ON AN INDIVIDUAL BASIS, NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY CLASS, CONSOLIDATED OR REPRESENTATIVE ACTION. There is no jury trial.

13.3 Opt-out. You may opt out of this Section 13 by emailing legal@4rth.ai within 30 days of first accepting these Terms. If this Section 13 is found unenforceable, disputes will be heard in the state or federal courts of Wilmington, Delaware.

13.4 Arbitration details. The arbitrator decides all disputes about the scope and enforceability of this Section 13, except that a court decides the class action waiver. The arbitration takes place by video or in your county of residence, and is confidential. Each party pays its own legal fees unless the rules or law provide otherwise.

13.5 Mass arbitration. If 25 or more similar claims are brought by the same or coordinated counsel, they will be administered in batches of up to 50 claims, with one arbitrator per batch, and fees will be assessed per batch. Claims are tolled while they wait to be batched.

14. Changes to these Terms

We may update these Terms from time to time. We will post the new version with its date and, for material changes, notify you by email or in the Service before they take effect. If you keep using the Service after changes take effect, you accept them. If you do not agree, stop using the Service and close your account.

15. Sanctions and export

You confirm that you are not located in, or ordinarily resident in, a country or region subject to comprehensive sanctions, and are not on any government sanctions or restricted-party list. You will not use the Service in violation of export control or sanctions laws.

16. General

Entire agreement. These Terms and the documents they reference are the whole agreement between you and 4rth about the Service.
Assignment. You may not transfer these Terms without our consent. We may transfer them to an affiliate or in a merger, acquisition or sale of assets.
Force majeure. We are not liable for delays or failures caused by events beyond our reasonable control, including outages of third-party providers.
Severability and waiver. If a provision is unenforceable, the rest stays in effect. Not enforcing a right is not a waiver of it.
Notices. We may send notices to the email on your account or in the Service. You send notices to legal@4rth.ai.
Language. If we provide a translation, the English version controls to the extent permitted by law.
No third-party beneficiaries. These Terms do not give rights to anyone else, including End Users.

16.1 Order of precedence. If documents conflict, this order applies: a signed agreement with 4rth, then the Data Processing Addendum (for personal data), then these Terms, then the Acceptable Use Policy, then the pricing page and other policies.

16.2 Electronic communications. You agree to receive notices, receipts and agreements electronically, and that clicking or ticking to accept is your legally binding signature.

16.3 Independent parties. You and 4rth are independent contractors. Nothing in these Terms creates a partnership, joint venture, agency or employment relationship.

16.4 Interpretation. "Including" means "including without limitation". Headings are for convenience only.

16.5 Anti-corruption. Neither party will offer or accept bribes or improper payments in connection with these Terms.

16.6 US government users. The Service is commercial computer software and documentation, provided to US government users only with the rights in these Terms.

16.7 Equitable relief. Breach of Sections 5 or 8 may cause 4rth irreparable harm, and we may seek injunctive relief in any court without posting a bond.

17. Contact

4rth AI, Inc. · 4 Palo Alto Square, 3000 El Camino Real, Suite 200, Palo Alto, CA 94306, USA · legal@4rth.ai