Grexusagent-deliveryBeta

AI app builder for founders

Describe your idea. Agents make it a real app. You decide when it ships.

No code needed — just plain words. Agents plan, build, and test your app, then prove it works in a live preview before you approve.

No account, no card — you’ll see the real thing working.

The loop

You describe. Agents build & prove. You decide.

  1. You describe a feature, and the coach sharpens it.
  2. A planning agent breaks it into tasks.
  3. Design and code agents work on it in parallel.
  4. A test agent checks every criterion — a failing test sends the work back to code.
  5. A proving agent gathers the evidence: screenshots, the test run, a live preview.
  6. You decide. Only a person can approve a feature and publish it; then the loop turns to the next one.
  1. You describe

    Describe it, get the plan

    Type your idea in plain words. A short conversation fills the gaps, and Grexus turns it into a real plan — every feature, in order — ready to build before a single agent starts.

  2. Agents deliver

    Agents build & prove it

    AI agents build and test each feature in an isolated sandbox — then prove it in a live preview, with a screenshot, a passing test, or a real email behind every check.

  3. You decide

    You deliver the verdict

    Review the working change against the evidence and approve what ships. Agents can plan, build, and test — but they can never mark a feature done. That call is always yours.

What you get

A delivery cockpit, not a code generator.

Always know where it stands

Every feature moves through four plain lanes — Shaping, Building, Needs you, Done — so you always know exactly where each piece of your app stands.

See it working before you approve

Every feature ships to a live preview with real data. Tick off each check against real evidence — a screenshot, a passing test, an email in the inbox — not a diff you have to take on faith.

A coach in your plan

As you describe your idea, Grexus asks what you did not think to ask and catches anything vague or too big — so what the agents receive is clear enough to build right the first time.

Your keys, your code, your rules

Bring your own AI provider key — you pay your provider directly, keys encrypted and never logged. Your code lives in a real Git repository.

Why Grexus

Nothing is Done until you say so.

Every autonomous tool wants to close the loop for you. Grexus won’t. Agents plan, build, and prove — but the verdict that ships code is yours alone, enforced in the platform itself, not left to a prompt.

Agents can
  • Plan the change
  • Write & refactor the code
  • Run the tests
  • Assemble the evidence
Only you can
  • Approve the work
  • Request changes
  • Mark a feature done
  • Publish it

Cost, mastered

You hold the key — and the budget.

Grexus runs on your own AI provider key, so you decide what a build costs — with guardrails that make a runaway bill impossible.

At cost

Pay your provider directly

Bring your own Anthropic or OpenAI key and pay for exactly what each build uses. Grexus never marks up a token.

Hard cap

Builds can’t run away

Every build stops at a cap you set and waits for your call — it never silently drains your key on a loop that went sideways.

Cheaper by default

Frugal without trying

Grexus spends frontier models only where they matter and routes routine work to cheaper ones — automatically, behind the scenes.

  • EU-nativePlatform and sandboxes in Europe. GDPR by design.
  • Bring your own keyEncrypted at rest, injected per run, never logged.
  • Your code, alwaysYour app’s code lives in a real Git repository.
  • Hardened isolationEvery agent works in a locked-down sandbox that is destroyed after each build.

Pricing

Pay per app, not per attempt.

Your builds run on your own AI key, so there are no credits to count and no meter to watch. Pick the number of apps you need.

  • Free

    Freeforever

    See what you’re about to build — the whole plan, before you spend anything.

    • Shape your idea with the coach
    • A real implementation plan: every feature, in order
    • One app

    Building starts on Solo.

  • Solo

    Recommended

    €29/ month

    excl. VAT · €34.80 incl. 20% French VAT

    Ship one app, end to end — as many builds as it takes.

    • Everything in Free
    • Build features, review them, and say when they’re done
    • A live preview of every change
    • Publish your app with a grexus.app address
    • Sign-in, email and secrets for your app
    • One app — add more any time, per app
    Choose Solo

    Runs on your own AI key.

  • Pro

    Coming soon

    Pricing to come

    Three apps, and the control you need once they’re real.

    • Everything in Solo
    • Three apps included — add more, per app
    • Your own domain instead of a grexus.app address (coming)
    • More advanced settings as they land

  • Team

    Coming soon

    Pricing to come

    For teams delivering together.

    • Everything in Pro
    • Seats for your team
    • Shared review and delivery

Another idea? Add an app to your plan — nothing else changes. €12 / month per app, excl. VAT · €14.40 incl. 20% French VAT.

Prices exclude VAT. VAT is added at checkout at the rate that applies to you (20% in France); businesses outside France with an EU VAT number pay no VAT (reverse charge).

Questions

What founders ask before they start.

What is Grexus?

Grexus is an AI app builder with a human verdict. You describe an idea in plain words; AI agents plan, build and test a real web app and prove each part in a live preview. Nothing is done until you approve it, and Grexus hosts your app when you decide to publish.

Do I need to know how to code?

No. You describe what you want, answer a few questions, and review evidence — screenshots, passing tests, real emails — instead of code. The technical decisions are made for you, on one proven stack.

What can I build with it?

Web apps: booking tools, client portals, dashboards, internal tools. Grexus builds every app on one tested stack (React, NestJS and PostgreSQL) and hosts it for you. Native iOS and Android apps are not available yet.

How much does it cost?

Seeing the full plan for your idea is free, with no account and no card. Building starts on a paid plan, priced per app rather than per attempt. Builds run on your own Anthropic or OpenAI key, with a spending cap you set. Current prices are in the Pricing section above.

What if the AI gets it wrong?

Nothing ships until you approve it with the evidence in front of you. Send it back and the agents try again. A request outside the feature becomes a new feature, so nothing you have already approved can change behind your back.

Who owns the app, and where is it hosted?

Your app’s data and your AI key are yours, and the app’s code lives in a real Git repository. Publishing and every release are your decisions; the agents never touch your live app. The Grexus platform and its build sandboxes run in the EU.

Your turn

Describe it. Watch it get built.

No account and no card to start. Type what you want, and Grexus plans it, builds it and proves it works — you decide what ships.