Image: Sempere / Anthony Wertz · Sempere handwriting app showing a recipe with handwritten notes, drawings and a voice memo
Sempere, a local handwriting app built with Claude Code
A developer used Claude Code to build an open-source handwriting app for Apple devices after their previous notes app moved data to the cloud.
Credits
Earliest dated source: Details reviewed:
The full story
The maker wanted a handwriting app that kept notes locally and let them choose how to back up or synchronise them. They used Claude Code with Opus 5.5 to build Sempere, directing the architecture while agents handled implementation, integration and review.
The shared project targets Mac, iPad and iPhone, with a command-line interface on Mac and Linux and a static web viewer. It supports handwriting, media and Markdown with maths. The maker describes encryption and privacy features and publishes the GPL-3+ source; those are project claims rather than an independent security assessment.
Device and compatibility
- Mac, iPad and iPhone
Command-line interface also on Linux; static web viewer available
Source ↗
What Claude did
- App implementation, integration, efficiency checks and code review under the maker’s directionClaude Code · Opus 5.5 Source ↗
How it was done
Tools
Themes
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Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: Sempere, a local handwriting app built with Claude Code
The maker's Reddit post describing the project and reported results.