MYTH

Features

• Describe the app you want in plain English and get a working app back
• Attach screenshots of a look you want, or a PDF spec to build from
• MYTH writes a plan in plain words that you approve before any code is written
• Watch the code being written, file by file, as it happens
• See the finished app running in a phone frame in the browser
• Keep chatting to change it: add a screen, change the colours, adjust a layout
• Build screens by dragging and dropping, on a canvas drawn by real Flutter
• Edit any file yourself in a built in code editor
• Download the complete source code as a ZIP, with no lock in
• Build a real Android APK and install it on your phone
• Set the app icon, splash screen, colours, name and Android permissions
• Save versions of a project and restore any of them in one click
• Share a project by public link, or fork someone else's into your account
• Publish an app to the community marketplace, free or paid
• Buy apps other users have built, with star ratings and written reviews
• Sign in by email or Google, with email verification
• Generated code is checked and repaired automatically until it compiles cleanly
• Five AI providers behind one interface, with costs normalised into one credit
• Paid previews run in a Docker container per project with real Flutter hot reload
• Android builds run on a GitHub Actions build farm with live logs and cancelling
• Subscriptions, monthly credit allowances and coupons handled through Paddle
• Admin panel with roles, revenue analytics, feature flags and AI quality review

Challenges and solutions

1. 01

   Challenge

   Language models do not reliably write Dart that compiles, which is the core problem in this space.

   Solution

   Built the pipeline in four layers: a planner with hard limits, generation waves ordered by dependency with an explicit contract per wave, Dart repair modules for the mistakes models repeat (pubspec sync, theme slot types, DI wiring, import paths), and an analyzer gate feeding a small, focused fix loop until the build is clean.

2. 02

   Challenge

   Five model providers, each with its own streaming format, usage reporting and pricing, made quotas and cost control messy.

   Solution

   Put every provider behind one streaming interface and converted raw token usage into a single credit unit using a weighted cost model, so a balance means the same thing no matter which model ran.

3. 03

   Challenge

   Running generation waves in parallel risked two workers writing the same files and corrupting the project.

   Solution

   Gave each worker a frozen copy of the file tree, split batches so no two touch the same path, and merged results back in a fixed order. Sequential stayed the default and parallel is an option you turn on.

4. 04

   Challenge

   Serving the Flutter toolchain to many users at once, with real hot reload, without overloading the server.

   Solution

   Split preview into two tiers: cached web builds for free users, and one Docker container per project for paid users, with HTTP and WebSocket proxying so Flutter's own hot reload channel works. A session manager tracks containers, clears idle ones, and recovers orphans by reading Docker state after a restart.

5. 05

   Challenge

   Building Android APKs on demand in the cloud without paying for a dedicated build server.

   Solution

   Used GitHub Actions as the build farm: branches managed through the REST API, workflow triggering, run polling, live logs, artifact download and cancel support, with a Redis queue in front and a local SDK build path behind the same interface.

6. 06

   Challenge

   A design tool that fakes Flutter widgets in HTML always lies about the final result.

   Solution

   Shipped a separate Flutter Web app, deployed it through its own CI pipeline, and embedded it as the design canvas, talking to React over postMessage. A schema to Dart generator keeps the visual editor and the real source in sync.

7. 07

   Challenge

   Turning the generation engine into something people actually pay for, not just a demo.

   Solution

   Added Paddle billing with webhook verified fulfilment, cancellation grace periods, monthly quotas and refills, coupons, marketplace payouts with a hold period, and an admin panel with feature flags to run all of it.