head to head · open source
yomiyasu vs WritingTools
yomiyasu has 2,812 GitHub stars, 73 forks, 3 open issues and last shipped 3 days ago. WritingTools has 2,479 stars, 165 forks, 79 open issues and last shipped 3 months ago. yomiyasu leads on adoption by 13% (2,812 vs 2,479 stars). yomiyasu is written in Python under MIT; WritingTools is written in Swift under GPL-3.0. yomiyasu has attracted 3% as many forks as stars, WritingTools 7%. yomiyasu was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (gemini, llm), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| yomiyasu | WritingTools | |
|---|---|---|
| GitHub stars | ★ 2.8K | ★ 2.5K |
| License | MIT | GPL-3.0 |
| Written in | Python | Swift |
| Last push | 2026-10-31 | 2026-08-19 |
| Forks | ⑂ 73 | ⑂ 165 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick yomiyasu if
- You weight community size — 2.8K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick WritingTools if
- You want the WritingTools feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Swift
- You evaluated both and WritingTools fits your workflow better
About yomiyasu
yomiyasu（よみやす） これは何？ 『yomiyasu（よみやす）』は、AIが生成した日本語の不自然な比喩、曖昧な主述関係、不要な装飾を直し、読みやすい文章に整えるスキルです。 主に技術記事、設計書・仕様書、PR説明文、社内レポートなどの実務的な文章を対象として設計されています。 Codex、Claude Code、CursorをはじめとするAIコーディング環境に読み込ませて使用してください。 開発の背景、AI生成文の読みにくさ、コーパスを使った検証については、次の解説記事で紹介しています。 解説記事 : AI臭い日本語を脱臭するAgent Skill『yomiyasu』を作った話（Zenn） Built with curiosity at ALGO ARTIS ALGO ARTISについて 株式会社ALGO ARTISは、社会基盤の最適化に取り組むスタートアップです。 電力・海運・化学プラントといった現場では、膨大な制約が絡み合う複雑な運用計画を、今なお熟練者が手作業で組み立てています。 そうした高度な現場業務を数理モデル化し、実用的なヒューリスティック最適化アルゴリズムと業務システムを一貫して開発しています。 最適化技術を用いた社会インフラの変革に興味がある方は、公式ウェブサイトや採用情報をご覧ください。 背景と課題
read the full yomiyasu overview →
About WritingTools
Writing Tools 🍎 Using a Mac? Jump to the macOS (Native Swift Port) section → macOS Instantly proofread and optimize your writing system wide with AI: Summarize content (webpages, YouTube videos, documents...) in a click: Add your own buttons for unlimited potential! ✨ What is Writing Tools? Writing Tools is an Apple Intelligence inspired application for Windows, Linux, and macOS that supercharges your writing with an AI LLM (cloud based or local). With one hotkey press system wide, it lets you fix grammar, optimize text according to your instructions, summarize content (webpages, YouTube videos, etc.), and…
read the full WritingTools overview →
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Frequently asked questions
Is yomiyasu or WritingTools more popular?
yomiyasu has 2,812 GitHub stars and WritingTools has 2,479. yomiyasu has the larger community by that measure.
Are yomiyasu and WritingTools free?
Both are open source. yomiyasu is licensed under MIT and WritingTools under GPL-3.0. Neither carries a licence fee.
What is the difference between yomiyasu and WritingTools?
yomiyasu is written in Python and WritingTools in Swift. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, yomiyasu or WritingTools?
Choose yomiyasu if you want the larger community (2,812 stars) or its MIT licence terms. Choose WritingTools if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.