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Show HN: Penmentor – Claude marks up your handwritten math like a teacher
Penmentor is a tool that allows users to get handwritten math marked up by AI models like Claude, Gemini, or GPT. By pressing a key while working, users can have their work reviewed. It supports various agents such as claude:opus, claude:sonnet, claude:haiku, and codex:gpt-5.6-terra, as well as Antigravity CLI agents like agy:gemini-4-argon-medium. Penmentor is released under the MIT license.
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IngestedOffset at this time: UTC+0Oct 20, 2026, 16:00 UTC
- Ingested
- Oct 20, 2026, 16:00
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- Dev community
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