Cal.diy
Business & Operations
A community-driven, MIT-licensed, self-hosted scheduling tool forked from Cal.com with enterprise features removed. No managed version exists; personal, non-production use is recommended.
Ranking
Rankings based on user star ratings.
How ranks are decided
Apps with 3+ star ratings are ranked by a score computed from the average rating and the number of ratings. With few ratings, even a high average ranks lower; as ratings grow, the score approaches the real average. Rank depends on ratings only. Ratings are anonymous: one per app per browser.
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Gathering ratings
These join the ranking at 3 ratings.
Cosense (Scrapbox)
Business & Operations
A tool for sharing and organizing knowledge by writing and linking pages. Free for personal or non-profit use; the Business plan is listed at JPY 1,100 per user per month.
Free planJapanese UI
Excalidraw
Image, Photo & Design
An open-source virtual whiteboard for sketching hand-drawn-style diagrams and wireframes in the browser, with real-time collaboration, end-to-end encryption, and PNG/SVG export.
Free plan
Immich
Image, Photo & Design
A self-hosted photo and video management solution with a mobile app and web interface. It supports backup, albums, sharing and ML-based search.
Free planAI
KantanProEX（DT）
Business & Operations
A sales management app for freelancers, sole proprietors and small businesses. Manage customers, orders, invoices, services, partner companies and reports in one screen, and create, print or export quotes and invoices as PDF. It runs only on your Mac or Windows PC — your data is never stored online. No subscription: download it free and try every feature for the first 30 days.
Free planAIJapanese UI
Memos
Daily Life & Utilities
A free open-source self-hosted note-taking app. It keeps everyday notes in a personal timeline with Markdown and tags.
Free plan
Misskey
Social & Communication
Free open-source software for building social networking services, with ActivityPub support for Fediverse federation. It has a responsive web UI and PWA support.
Free planAIJapanese UIIndie
Obsidian
Business & Operations
A note-taking app that is free for personal use, with paid add-ons for Sync and Publish.
Free plan
Ollama
AI & Generative AI
An open-source tool for running open AI models locally or in the cloud. It provides a CLI, a REST API and Python and JavaScript libraries.
Free planAI
Open WebUI
AI & Generative AI
A self-hosted, extensible web platform for interacting with AI models via Ollama or OpenAI-compatible APIs, designed to run fully offline.
Free planAI
Plausible Analytics
Web Services & Online Tools
A privacy-friendly, lightweight alternative to Google Analytics, with no cookies or cookie banners. It offers a 30-day free trial without a credit card.
Indie
Tera Term
Programming & Dev Tools
An open-source terminal emulator with an SSH module (TTSSH). Japanese manuals and language files for localizing menus are provided.
Japanese UI
Uptime Kuma
Programming & Dev Tools
An easy-to-use self-hosted monitoring tool. It monitors HTTP(s), TCP, ping, DNS and Docker containers and sends notifications to many services.
Free plan
サクラエディタ (Sakura Editor)
Programming & Dev Tools
A free text editor for Windows with a Japanese-language focus. Its source code is published on GitHub.
Free planJapanese UI
ポイピク (Poipiku)
Image, Photo & Design
A Japanese web service for posting and managing illustrations. It supports uploading up to 200 images at once and anonymous emoji reactions.
Japanese UI