actionlint
Programming & Dev Tools
A static checker for GitHub Actions workflow files, published as a linter that finds mistakes before the workflows run.
Free planIndie
Apps by indie makers
33 apps
33 apps that APP NAVI confirmed from official sources to be built by an individual or a small team. Last checked: 2026-11-05. Anything we could not confirm stays "Unverified"; we never guess. Prices and specs change, so check each app's official page before you use it.
AIAvatarKit
AI & Generative AI
A Python toolkit for quickly building conversational AI avatars, published by the same GitHub account (uezo) as ChatdollKit.
Free planAIIndie
AntennaPod
Mobile Apps
An open-source podcast manager for Android. It subscribes to any RSS feed, downloads episodes for offline listening and has no ads in the app.
Indie
AtCoder Problems
Web Services & Online Tools
A web app that helps AtCoder users solve problems and manage their progress, under the tagline 'Extend your AtCoder'.
Free planJapanese UIIndie
ChatdollKit
AI & Generative AI
A Unity SDK for turning a 3D model into a voice-enabled chatbot. It supports several LLMs such as ChatGPT, Claude and Gemini and speech synthesis such as VOICEVOX and AivisSpeech.
Free planAIJapanese UIIndie
CmdDeck
Mobile Apps
A command reference app for IT work on iOS, iPadOS and macOS. It lists 1,510 commands and 120 troubleshooting flows, works fully offline, supports 9 UI languages and is a one-time purchase.
Japanese UIIndie
CotEditor
Programming & Dev Tools
A lightweight plain-text editor for macOS with syntax highlighting and regex search, plus CJK-friendly features such as vertical text and encoding detection. It is free on the Mac App Store.
Free planJapanese UIIndie
Fedibird
Social & Communication
A general-purpose Mastodon server in Japan run by admin noellabo, offering many original features. New registrations were suspended at the time of checking.
Japanese UIIndie
hledger
Daily Life & Utilities
Plain-text accounting software, described on its official site as "plain text accounting, made easy".
Indie
Ice Cubes
Mobile Apps
An open-source Mastodon client written in SwiftUI, published from developer Dimillian's personal GitHub account.
Indie
ImageGlass
Image, Photo & Design
A fast, modern image viewer supporting more than 90 formats, available for Windows, macOS and Linux per its official site.
Indie
Mealie
Daily Life & Utilities
A self-hosted recipe manager and meal planner that can import recipes from URLs and build shopping lists.
Indie
Mery
Daily Life & Utilities
A lightweight text editor for Windows that can be extended with macros and color themes.
Japanese UIIndie
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
ntfy
Web Services & Online Tools
An HTTP-based pub-sub notification service that sends push notifications to phones and desktops via PUT/POST. It can be used without sign-up and is open source.
Free planIndie
Pi-hole
Security & Privacy
Network-wide ad and tracker blocking software. The official site says that once installed it covers every connected device, including phones and smart TVs.
Indie
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
sd-scripts
AI & Generative AI
A collection of training, generation and utility scripts for Stable Diffusion and other image generation models, covering LoRA training and fine-tuning. Japanese versions of the README and docs are provided.
Free planAIJapanese UIIndie
Secretlint
Security & Privacy
A pluggable linter that prevents credentials from being committed. It scans a project for secrets and can run as a pre-commit hook.
Free planIndie
Stocha
Mobile Apps
A photo organizer app for tidying photos on the device. The developer's site says it is designed with privacy as the top priority and has no external data communication.
Indie
tbls
Programming & Dev Tools
A CI-friendly tool, written in Go, that documents a database. The repository describes it as generating documentation from schema information.
Free planIndie
textlint
Programming & Dev Tools
A pluggable linter for natural-language text. Rules are added via npm, and it can check Markdown and plain text from the CLI with partial auto-fix.
Free planIndie
The Odin Project
Education & Learning
A free, open-source coding curriculum that can be taken entirely online. It offers a roadmap to full-stack development with hands-on projects and is maintained by volunteers.
Free planIndie
TheDesk
Social & Communication
A desktop client for Mastodon (and Misskey) with a multi-column timeline layout. The official site says v25 onward is a modified version of Fedistar.
Japanese UIIndie
tide736.net
Daily Life & Utilities
A site offering tide tables for 736 ports along the Japanese coast, plus a tide calendar and API. It states it does not replace the official tide tables of the Japan Coast Guard.
Japanese UIIndie
Tux Paint
Education & Learning
A free drawing program for children aged 3 to 12. The official site states it has no ads, is open source under the GPL and is built by a worldwide volunteer team.
Free planJapanese UIIndie
uBlock Origin
Security & Privacy
An open-source, efficient content/ad blocker extension for Chromium and Firefox, as described in its GitHub repository.
Indie
Voicepaper
Mobile Apps
A text-to-speech app for iPhone, iPad and Android. Import PDFs, EPUBs, web articles and photos and listen; the English page says it is free and has no ads.
Free planAIIndie
waifu2x
Image, Photo & Design
A web service that upscales and denoises anime-style art and photos using deep convolutional neural networks, with a 20-language interface.
AIJapanese UIIndie
Whalebird
Social & Communication
A desktop client for the Fediverse supporting Mastodon and other services, with account switching and streaming timelines.
Free planIndie
WOLF RPGエディター(ウディタ)
Games & Entertainment
A free RPG-making tool driven by Japanese-language commands. The official site says games made with it may be freely distributed, sold or submitted to contests.
Free planJapanese UIIndie
Zeny
Mobile Apps
A simple money tracker for logging expenses in a few taps, with history, a calendar and charts. The site says it is free forever with no sign-up.
Free planIndie
ゆっくりMovieMaker4
Video, Audio & Music
A video editor for yukkuri-style commentary videos, offering video export, template features and support for many speech-synthesis tools and services.
Free planJapanese UIIndie