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Every other AI coding tool is a chat window over someone else's model. Whittl is the knowledge layer that sits between you and the AI — 75+ auto-fix rules, a curated skills library for PySide6, Flet, CustomTkinter, and general Python, oscillation guards, hard round caps, tool executors, and validators. The model writes the code; Whittl makes the model better at building Python desktop apps.

That layer compounds with use. Every auto-fix rule learned from a real bug. Every skill written from a confirmed pattern. The AI model lineup changes monthly — Sonnet, GPT-5, DeepSeek V4, Qwen3.5 Plus — the knowledge layer keeps Whittl's output consistent and reliable across all of them.

• 75+ auto-fix rules covering Qt scoped enums, Flet hallucinations, PyInstaller resource paths, deprecated APIs, hallucinated class names, and dozens more — Whittl catches and rewrites what the AI gets wrong before the code ever fails
• Skill library auto-injected based on your project's framework — PySide6 patterns for desktop apps, Flet mobile rules for Android builds, threading rules for both
• Oscillation guard + 5-round cap prevent runaway autofix loops that would otherwise burn tokens forever on the same error
• Validators catch bad code before it reaches your project — duplicate marker handling, file truncation detection, structural diff guards
• Compatible with Claude Code skills — drop in skills written for Claude Code or OpenCode and Whittl picks them up alongside its own library

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Drop a screenshot of any UI into Whittl and get a native Python app. A Figma mock, a web app you want to run locally, your own music player you're tired of configuring. Every other AI coding tool outputs more web. Whittl uniquely converts design references into runnable software you own.

• Drag-drop or clipboard-paste a screenshot into chat
• Works with Claude (Opus / Sonnet / Haiku), GPT-4o, Gemini 2.5 Pro/Flash, Llama 3.2 Vision, Pixtral, Qwen-VL, Gemma 3 — any vision-capable model on OpenRouter
• Images flow through tool-use rounds, not just the initial chat turn — the AI sees your image while it builds, not just when you send it
• Preview before send — attached images show inline with filename and size, removable, no silent bytes leaving your machine

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• Code editor with syntax highlighting, AST-powered code folding, autocomplete, and bracket auto-pairing
• Real-time error detection (pyflakes) with inline error indicators
• Multi-file project management with tabbed editing and line count tracking
• Smart file routing — keyword search + AI selects the right files in large projects
• One-click builds — Windows .exe, Linux AppImage, Android APK, and setup installers
• Explain mode — highlight any code and get a plain-English explanation
• Undo/history — roll back bad generations to any previous state
• Multi-file search across your entire project
• In-app auto-updater — Download → Restart to install, with SHA-256 checksum verification, no browser hop
• Real .py files on your disk — open in any editor, version with git, own forever
• Works on Windows and Linux

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• 4 targets — Desktop (PySide6), Mobile (Flet), Basic (CustomTkinter), or General Python (CLI tools, scripts, plugins)
• Conversational AI — ask questions, get explanations, iterate on your code through chat
• 5 AI backends — Claude, DeepSeek, Gemini, OpenRouter (200+ models), or fully offline with Ollama
• Smart editing — the AI changes only the lines that need to change, dramatically faster and cheaper than rewriting whole files
• Self-healing autofix — when your app crashes, the AI reads the traceback and iterates on fixes automatically, up to 10 rounds until it works
• Built-in cost cache — multi-round conversations reuse context so your API bill stays small
• 75+ auto-fix rules catch common mistakes — hallucinated APIs, deprecated patterns, missing imports
• Context memory — the AI remembers your earlier conversation instead of forgetting after a few messages
• Bring your own API key — no middleman markup, no message limits, no monthly quotas

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Mobile APK builds are currently experimental. They work but may need troubleshooting on some devices. Desktop builds (Windows/Linux) are stable and production-ready.

• Build Android APKs with one click — no Android Studio, no Java, no Gradle
• Device format selector — Phone, Tablet, or custom dimensions
• One-click install to device via USB
• Pure Python APK signing — all build tools downloaded automatically

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Cormorant Garamond and Inter typography, Phosphor Duotone icons throughout, and a refined navy, cream, tan, and copper palette. Dark and light themes are both polished, and flip cleanly without stale colors bleeding through.

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1. Start a new project or import existing Python code

2. Write code in the editor, or describe what you want and let AI generate it

3. Use the AI chat to ask questions, explain code, or iterate on changes

4. Run and test directly inside Whittl with built-in error detection

5. Build to .exe, AppImage, or Android APK with one click

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