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
List of apps with a free plan
89 apps
89 apps that APP NAVI confirmed from official sources to have a free plan. 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
AivisSpeech
AI & Generative AI
Free speech synthesis software that produces emotionally expressive voices, usable for video narration, voice dramas and similar.
Free planAIJapanese UI
Anki
Education & Learning
A spaced-repetition flashcard program. The desktop version is free and cards sync across devices via AnkiWeb.
Free plan
assift(アシフト)
Daily Life & Utilities
A web service dedicated to building shift schedules: AI drafts a schedule from your conditions, and you share it by URL. Free for up to 10 staff.
Free planAIJapanese UI
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
Booking Package
WordPress (plugins & themes)
A booking plugin that lets you take reservations such as rooms, services and events directly on WordPress pages.
Free planJapanese UI
Chatbox AI
AI & Generative AI
An AI client for using GPT, Claude, Gemini, DeepSeek and more with your own API keys, free to start on desktop, mobile and web.
Free planAI
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
CloudSecure WP Security
WordPress (plugins & themes)
A Japan-made security plugin that protects the admin area and login URL from unauthorized access, with simple on/off feature toggles.
Free planJapanese UI
Comfortable Admin Page
WordPress (plugins & themes)
Gathers hard-to-reach admin settings in one place so you can tailor a friendlier WordPress dashboard.
Free planJapanese UI
ComfyUI
AI & Generative AI
A node/graph-based tool for building visual AI workflows such as diffusion image generation, available as a desktop app and cloud service.
Free planAI
Coolify
Programming & Dev Tools
A self-hostable PaaS for deploying apps, databases and 360+ services to your own server, positioned as an open-source alternative to Heroku.
Free plan
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
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
Cryptomator
Security & Privacy
Free open-source software that encrypts files on your device before they go to cloud storage. The site lists Cryptomator for individuals and Cryptomator Hub for teams.
Free plan
CryptPad
Web Services & Online Tools
An end-to-end encrypted, open-source collaborative office suite with documents, spreadsheets, forms and kanban boards. It can be self-hosted.
Free plan
Dify
AI & Generative AI
A platform for building agentic workflows, agents and knowledge pipelines on one canvas, deployable on cloud, in your VPC, or self-hosted.
Free planAIJapanese UI
Dwarf Fortress
Games & Entertainment
A long-running fortress-building simulation about managing a dwarven settlement. The official site points to Steam and itch.io and offers a Classic version download.
Free plan
Editor Bridge
WordPress (plugins & themes)
Extends the block editor's core blocks with extra styles and formats.
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
Exercism
Education & Learning
A free platform for learning and practicing programming, with exercises, mentoring and a CLI. It is run by a UK-registered not-for-profit.
Free plan
FireAlpaca
Image, Photo & Design
A free paint tool with brushes, layers, comic panel features and filters; a paid FireAlpaca SE is sold on Steam.
Free planJapanese UI
Flexible Table Block
WordPress (plugins & themes)
Adds cell merge/split and per-element styling to the table block in the block editor.
Free planJapanese UI
FormNest
WordPress (plugins & themes)
A form plugin built around Japanese contact-form conventions, with a confirm screen and postal-code address autofill.
Free planJapanese UI
Fukasawa
WordPress (plugins & themes)
A minimal masonry-style blog theme for photographers and collectors.
Free planJapanese UI
GCompris
Education & Learning
An educational software suite for children aged 2 to 10 with more than 100 activities covering reading, arithmetic, science and geography. It is developed by the KDE community.
Free plan
Gitea
Programming & Dev Tools
A painless self-hosted all-in-one software development service including Git hosting, code review, package registry and CI/CD.
Free plan
Gyazo
Web Services & Online Tools
A capture tool for screenshots and video that creates a shareable URL right away. It offers shortcut capture, OCR search, tags and collections.
Free planAIJapanese UI
Healthchecks.io
Web Services & Online Tools
A monitoring service for cron jobs and other scheduled tasks. It alerts you when a job's ping arrives late or not at all, and the official site says 20 jobs can be monitored for free.
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
Invoice Ninja
Business & Operations
Invoicing software for freelancers and small businesses covering invoices, quotes, expenses, time tracking and projects, with a free plan.
Free plan
Keitai
WordPress (plugins & themes)
A tribute to early-2000s Japanese mobile sites (NTT DoCoMo 502i era): single 240px column, no front-end JavaScript.
Free plan
Kolibri
Education & Learning
An offline-first learning platform for delivering educational content without internet access. It is developed by the nonprofit Learning Equality.
Free plan
Langflow
AI & Generative AI
A low-code AI builder for agentic and RAG apps. You can code in Python and use any LLM or vector database.
Free planAI
Leasy
Mobile Apps
A simple flashcard-style memorization app where you add your own words or phrases. It offers multiple-choice and typed questions, review of missed items and a random test, with data kept on the device.
Free planJapanese UI
Lightning
WordPress (plugins & themes)
A simple, easily customizable Bootstrap-based theme that works well with custom post types and taxonomies.
Free planJapanese UI
LogonTracer
Security & Privacy
A tool that visualises and analyses Windows event logs to investigate suspicious logons, published by JPCERT Coordination Center.
Free plan
Lovecraft
WordPress (plugins & themes)
A two-column blogger theme with a full-width header image and custom accent color support.
Free planJapanese UI
MalConfScan
Security & Privacy
A Volatility plugin for memory forensics that extracts configuration data of known malware, published by JPCERT Coordination Center.
Free plan
Mastodon
Social & Communication
A free and open-source decentralized social media platform, described on its official site as radically different.
Free plan
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
Mindustry
Games & Entertainment
A sandbox tower-defense game where you build factories to process materials and defend your base against enemy waves, with multiplayer servers.
Free planJapanese UI
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
Mochi
Education & Learning
A spaced-repetition flashcard app that doubles as a Markdown note tool. It is local-first and supports LaTeX plus language-learning aids such as dictionaries and text-to-speech.
Free planAI
NewPipe
Mobile Apps
A free open-source YouTube client for Android designed to avoid ads and unnecessary permissions, with downloads, background play and a popup player.
Free plan
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
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
Ollie
WordPress (plugins & themes)
A block theme with over 50 patterns and a customizable design system through Global Styles.
Free plan
Online Lesson Booking
WordPress (plugins & themes)
A scheduler and booking form for one-on-one online lessons, with email notifications for bookings and cancellations.
Free planJapanese UI
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
Organic Maps
Mobile Apps
An offline maps and navigation app built on OpenStreetMap data. The official site says it has no ads or tracking and is free.
Free planJapanese UI
Penpot
Image, Photo & Design
An open-source design platform for teams, available as a hosted app or self-hosted, with an MCP server that lets AI agents work in it.
Free planAI
Pinta
Image, Photo & Design
A free, open-source painting and image editing program built around simplicity, available on Linux, Mac, Windows and BSD according to its official site.
Free plan
Pochipp
WordPress (plugins & themes)
Search products on Amazon and Rakuten and manage affiliate links from within WordPress.
Free planJapanese UI
Pz-LinkCard
WordPress (plugins & themes)
Displays links as blog cards via a shortcode, with appearance options in the settings screen.
Free plan
Rams
WordPress (plugins & themes)
A clean, minimalist responsive theme for bloggers.
Free planJapanese UI
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
SHAREVOX
AI & Generative AI
A free text-to-speech app that uses deep-learning speech synthesis. The official site says users can adjust intonation and speed in detail and create a voice from their own recording.
Free planAIJapanese UI
shitate
WordPress (plugins & themes)
A block theme for corporate sites where choosing one of eight type-scale ratios in the Customizer sets heading and body sizes.
Free plan
Simple Days
WordPress (plugins & themes)
A free responsive blog theme designed mobile-first.
Free planJapanese UI
Sonic Pi
Education & Learning
A free open-source tool for making and performing music by writing code. The official site says it runs in the browser and also ships as apps for Windows, macOS and Linux.
Free plan
Stirling PDF
Daily Life & Utilities
A PDF tool you run on your own machine or server for editing, converting, OCR and redaction; free for individual use.
Free planAI
Taski
Business & Operations
A team issue tracker that shows the same issues as list, board, Gantt and calendar views, with import from Redmine and Trello.
Free planAIJapanese UI
Tatoeba
Education & Learning
A collaborative multilingual sentence collection with translations, useful for finding example sentences when learning languages; it has a Japanese interface.
Free planJapanese UI
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
Tusky
Mobile Apps
A lightweight Android client for Mastodon supporting photos, videos, lists and custom emojis. It is free and open source.
Free plan
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
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
Vikunja
Business & Operations
An open-source, self-hostable task manager with list, kanban, Gantt and table views.
Free plan
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
VOICEVOX
Video, Audio & Music
Free text-to-speech and singing voice synthesis software; the page states it is free for commercial and non-commercial use subject to each character's terms.
Free planJapanese UI
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
Word Balloon
WordPress (plugins & themes)
Adds speech balloons to posts. Supports both the block and classic editors and ships with a Japanese translation.
Free planJapanese UI
XO Security
WordPress (plugins & themes)
Strengthens login security with a login log, attempt limits, captcha, login URL change and two-factor options.
Free planJapanese UI
Yes/No Chart
WordPress (plugins & themes)
Lets you create a yes/no question flow (a yes/no chart) on a WordPress site.
Free planJapanese UI
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
Zotero
Education & Learning
A research tool for collecting, organizing, annotating and citing sources, developed by a nonprofit and free to use.
Free plan
アサリツールズ (Asari Tools)
Web Services & Online Tools
A free collection of web tools for streamlining web work, including text formatting, image conversion and SEO analysis, run by Studio Asari LLC in Nagoya.
Free planJapanese UI
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
ティラノスクリプト
Games & Entertainment
A free tool for making visual novel games. Games can be published for PC, smartphones and browsers, and the official site says commercial use has no restrictions.
Free planJapanese UI
ドットインストール (dotinstall)
Education & Learning
A programming learning service built on videos of three minutes or less. Its top page lists 578 lessons and 8,635 videos, and it is run by dotinstall Inc. in Meguro, Tokyo.
Free planJapanese UI
なでしこ3 (Nadesiko3)
Education & Learning
An open-source programming language in which programs are written in Japanese, aimed at automation and learning to program. A web version and a PC (Go) version are available.
Free planJapanese UI
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