Frequently Asked Questions

Quick answers for anyone curious about bld402.

What is bld402?

bld402 is a free service that helps you build and deploy web applications without writing any code. You describe what you want to a coding agent (like Claude Code, ChatGPT Codex, or Cursor), paste the bld402 link, and the agent builds and deploys a working app for you — usually in under 10 minutes.

Do I need to know how to code?

No. That's the whole point. You describe your idea in plain English, and your coding agent handles all the technical work. bld402 provides the agent with templates, step-by-step instructions, and best practices so it can build a real, working application.

How much does it cost?

bld402 itself is completely free. The apps you build run on run402 infrastructure, where the prototype tier is free (lasts 7 days, costs $0 real money). Your coding agent sets this up automatically — you don't need to do anything. If you want to keep your app running longer, paid tiers start at $5/month. You can pay with a credit card via Stripe, or your agent can pay autonomously using digital dollars (USDC stablecoin) — either way, the experience is the same.

What kinds of things can I build?

Anything you can describe: todo lists, voting apps, trivia games, landing pages with email signups, expense trackers, recipe books, workout logs, flash card apps, and more. Check out the Showcase for examples and the Templates for ready-made starting points.

How long do my apps last?

It depends on the plan your coding agent chooses. Prototype projects last 7 days. Hobby projects last 30 days and can be renewed. After a lease expires, your app goes read-only for 7 days, then gets archived, and is permanently deleted after 37 days. You can renew anytime before deletion.

Wait — do I need my own AI agent? Doesn't bld402 provide one?

No — bld402 does not provide an AI. We provide the knowledge — structured instructions, templates, and best practices that teach your AI agent how to build and deploy real web apps. Think of it like a recipe book: we supply the recipes, but you bring the chef.

The good news? You probably already have one. If you use ChatGPT, Claude, Cursor, or similar tools, you already have access to a coding agent. And if you don't have one yet, getting started is free:

• Download Claude — Claude Code is a powerful coding agent from Anthropic.
• Try OpenAI Codex — OpenAI's coding agent built into ChatGPT.
• Or use any other coding agent — Cursor, Windsurf, Cline, and more all work with bld402.

Why use my own AI instead of an all-in-one builder?

All-in-one app builders bundle a limited AI with a locked-in platform. That means you're paying a premium for their AI, restricted to their templates, and stuck on their hosting. When you use your own coding agent with bld402:

• You choose the best AI for you — use whichever agent you already pay for or prefer. No double-paying for an inferior built-in model.
• Your agent isn't limited to one task — the same Claude or Codex that builds your app also writes your emails, analyzes your data, and helps you with everything else. One subscription, unlimited uses.
• You own the workflow — bld402 teaches your agent how to build. run402 provides the cloud services (database, hosting, auth). No lock-in, no walled garden.

In short: bld402 = the knowledge. run402 = the cloud. Your AI agent = the builder. You bring the builder; we handle the rest.

Which AI agent should I use?

You need a coding agent — one that can create files, run commands, and make web requests. Examples: Claude Code, ChatGPT Codex, Cursor, Windsurf, or Cline. Regular chat-only assistants (like ChatGPT without Codex, or Gemini) won't work because they can't fetch web pages or write files.

My agent can't access bld402.com. What do I do?

Some agents run in a sandbox that blocks web access. If your agent says it can't reach bld402.com, tries to open a browser, or tries to install an extension — it's the wrong type of agent. Switch to a coding agent like Claude Code, ChatGPT Codex, Cursor, or Windsurf. These agents fetch web pages directly with HTTP requests — no browser needed.

What's the right way to give my agent the link?

Paste the full URL directly into the chat — don't say "go to" or "open". For example:

"I want to build a voting app. Here are the instructions: https://bld402.com"

This tells the agent to fetch the page content, not try to open a browser.

What if my app has a bug?

Tell your coding agent what's wrong. It can read the deployed code, diagnose the issue, and redeploy a fix. You can also ask it to add features or change the design after the initial build.

Can I edit my app after it's deployed?

Yes. Just tell your coding agent what you want to change. It can update the code and redeploy. You can iterate as many times as you want within your project's lease period.

Is my data private?

Your app's data is stored on run402 infrastructure with encryption at rest and in transit. Each project is isolated in its own database schema. See run402's Privacy Policy for full details.

Who can see my app?

Your deployed app gets a public URL (like yourapp.run402.com). Anyone with the link can visit it. If your app has authentication (login/signup), you control who can access what.

What happens to apps that violate the rules?

Apps deployed through bld402 must follow run402's Acceptable Use Policy. Apps containing malware, phishing, illegal content, or other prohibited material can be taken down without notice. You're responsible for everything your coding agent deploys on your behalf.

I don't need templates. I can code — I just need infrastructure.

You want run402 — it's the infrastructure layer that powers bld402. run402 gives you direct access to Postgres, REST APIs, auth, storage, and static site hosting. Paste https://run402.com/llms.txt into your coding agent's chat and you're ready to go.