Describe it. K2Coder builds it, runs it and checks it.
A builder app for macOS: websites, web apps, APIs and iPhone apps, made by AI and verified in a real browser or simulator before it tells you it is done.
88 MB · free · no account needed
macOS 14 or later · Apple silicon and Intel · signed and notarised by Apple, so it opens without a warning · Windows is being built now
iPhone and Mac app projects need Xcode, so they work on macOS only. Websites, web apps and APIs work on both.
Projects like Xcode
New project → website, React web app, Node API or iPhone app. Run it with one button and see it in the Preview.
It checks its own work
The builder opens your page in a real browser at phone and desktop width, clicks through it and fixes what is broken.
iPhone apps
SwiftUI projects that build with Xcode and run in the iPhone simulator, with the live screen inside the app.
Remembers your project
Each project keeps a small wiki of decisions and conventions, so the next session starts where the last one ended.
Many AI models
Gemini, OpenAI, DeepSeek, Kimi, local models on your Mac, and Claude through your own Claude plan.
Your keys stay yours
Provider keys live in your Mac's Keychain and never reach the AI's own commands.
Your own keys: add a Gemini, OpenAI, DeepSeek or Kimi key in Settings and you pay the provider directly. Local models on your Mac cost nothing.
Quantum Cloud credit: sign in with your email and buy prepaid credit in US dollars (card, UPI, netbanking or PayPal). You see what each build cost, and a project can have its own budget. Claude models are never sold on credit: they use your own Claude plan.
Your projects stay on your Mac. Crash reports are off until you say yes, and even then they contain only the error and K2Coder's own code locations — no file names, prompts or keys. K2Coder includes Node.js under the MIT licence; the full notices ship inside the app.