We're building the platform every app gets rebuilt on.

Anyone with an idea should be able to ship a real app. 4rth turns a plain-English description into a live, hosted app, with no code to write and no codebase to maintain.

1,100+apps built on 4rth
1,000+new creators every month
9,700+app pages generated by AI
95%of builds pass automated health checks
Headquarters

Built in the heart of Silicon Valley

We're based in the SF Bay Area, where the platforms our team helped build were born. Our engineering hub in India builds alongside us around the clock.

Silicon Valley, California · HQIndia · EngineeringBuilding around the clock
Why we started

Other tools hand you code. We hand you the app.

AI made it easy to generate an app, but most tools leave you owning a codebase: every bug, upgrade and new feature becomes your job. We think the codebase is the part to remove.

The usual way

Prompt → code → you maintain it

  • 1A codebase you have to understand
  • 2Hosting, databases and keys to set up
  • 3Every fix and upgrade is on you
The 4rth way

Prompt → live app → keep improving

  • ✓Describe it in plain English, get a working app
  • ✓Hosted for you, with a live link to share
  • ✓Change anything by chatting; apps improve as AI models do
  • ✓Earn from your appComing soon
What we believe

Four ideas behind every decision

Simple

Building an app should feel like describing it to a friend.

For everyone

You don't need to be technical to build something people use.

Honest

Clear about what's live today and what's still coming.

Real outcomes

We measure ourselves by apps that launch and get used.

The team

Built by engineers who scaled platforms

Our team has built and run systems at Apple, Intel, Meta, PayPal and Remitly. Now we're building the platform your app runs on.

40+years of combined platform experience
5companies where our team built at scale
2hubs: Silicon Valley and India
Leadership

20+ years leading platform teams at Apple and Intel.

VisionGo-to-marketPartners
Engineering

VP-level engineering at Remitly, with years at Meta and PayPal scaling distributed systems and marketplaces.

ArchitectureReliabilityScale
AI runtime

IIT alumni who own the runtime that turns a description into a live app.

Model routingQuality checksMonitoring
Advised byA VP of Technology at a global telecom software companywho helped build and scale a cloud platform through its acquisition
Why you can trust 4rth

Built to be dependable

Checked automatically

Every build runs automated health checks for broken pages and failed actions. 95% pass on the first run.

Your app, your users

You keep your users and your data. There's no codebase to manage or migrate.

Hosted for you

We run and monitor the infrastructure, so there are no servers for you to set up or secure.

Honest about what's live

We say clearly what works today and what's coming soon, like built-in monetization.

Have an idea? Build it today.

Describe it in plain English. We'll handle the rest.