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Scrbbl
Scrbbl is an iPad app that generates handwritten AI answers when users write text and underline it.
Scrbbl is an open source iPad application that allows users to write notes using an Apple Pencil and receive AI-generated answers directly on the page. By underlining text three times or circling it, users trigger quick or detailed responses that stream in word by word. The app sends images of the handwriting to OpenAI models and displays the resulting text in a handwriting font. It supports web search for time-sensitive questions and requires a user-provided OpenAI API key. The project is designed for iPadOS and includes source code intended to be built via Xcode.
Scrbbl at a glance
Key features
- Recognizes triple underline gestures for quick answers
- Recognizes circle gestures for longer answers
- Sends handwriting images to OpenAI
- Streams answers word by word
- Displays responses in a handwriting font
- Performs web searches for current information
- Stores API keys securely in the Keychain
Use it for
- Asking quick questions on an iPad canvas
- Generating detailed explanations with examples
- Searching the web via handwritten queries
Alternatives to Scrbbl
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- Arc AI — Acts directly on the current screen without copying, pasting, or app switching.
- NoteGen — It keeps notes in local Markdown files and runs completely free with no subscription.
- Spilr — Private AI journaling with mood tracking and secure local data handling.
- Rember — Generates high-quality flashcards using proven spaced repetition methods.
- Lecta — Converts class PDFs, photos, and recordings into interactive study materials.
- Scrieb — Runs entirely on your computer to keep sensitive data private without uploading audio.
- Folio — It combines local document reading with built-in AI assistance and open-source code.
- Ace — Generates verified four-option quiz questions from your own study materials.
- PenEcho — Connects AI tools directly to an infinite spatial canvas via the PenEcho MCP server.
- NoteWorthy — It uses private on-device artificial intelligence without accounts or uploads.
All Scrbbl alternatives