Actual Budget
Daily Life & Utilities
A local-first, privacy-focused personal finance app built around envelope budgeting, with an optional self-hosted sync server.
Apps for Web browser
112 apps
112 apps that APP NAVI confirmed from official sources to run on Web browser. 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
Akaunting
Business & Operations
Free, open-source online accounting software for small businesses and freelancers; send invoices and track expenses.
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
Education & Learning
A competitive programming site that holds regular contests of several kinds such as ABC, ARC and AGC, with rankings and practice contests.
Japanese 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
Authelia
Security & Privacy
An open-source authentication and authorization server providing multi-factor authentication and single sign-on. It also works as an OpenID Connect 1.0 provider alongside reverse proxies.
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
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.
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
CMAN インターネットサービス
Web Services & Online Tools
A site for IT engineers and web creators with tools such as server monitoring, QR code generation, an .htaccess generator and image editing. Almost all services are described as free.
Japanese 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
CrowdSec
Security & Privacy
A security service providing IP reputation and threat feeds built from real production servers, together with its open-source Security Engine.
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
Editor Bridge
WordPress (plugins & themes)
Extends the block editor's core blocks with extra styles and formats.
Free planJapanese UI
Ente Auth
Security & Privacy
A free, open-source two-factor authentication app with end-to-end encrypted backups and sync across devices. It can also be used offline without an account.
Etherpad
Web Services & Online Tools
A real-time collaborative editor you host yourself. It shows authorship by colour, lets you replay history, and can be extended with plugins.
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
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
Firefly III
Daily Life & Utilities
A free, open-source personal finance manager that you run on your own server.
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
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
Graphite
Image, Photo & Design
A free, open-source 2D graphics tool (alpha) that combines vector editing and node-based generative design, running as a web app.
Grocy
Daily Life & Utilities
A household management tool that bills itself as "ERP beyond your fridge", an open-source project you host yourself.
GROWI
Business & Operations
An open-source Markdown wiki for team knowledge sharing, with real-time co-editing, permissions and an AI agent.
AIJapanese UI
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
Hoppscotch
Programming & Dev Tools
An open-source API development ecosystem available on web, desktop and CLI, with offline, on-prem and cloud options.
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
Jotoba
Education & Learning
A multilingual Japanese dictionary built on free resources. It covers words, kanji, names and radicals and exposes a public API.
Karakeep
Daily Life & Utilities
An open-source bookmark manager for links, notes and images, with AI auto-tagging and self-hosting; apps for iOS, Android, Chrome and Firefox.
AI
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
Kimai
Business & Operations
An open-source time tracker for project-driven teams, with reports and invoicing.
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
Lemmy
Social & Communication
A decentralised discussion platform for communities, as described in its GitHub repository.
Lightning
WordPress (plugins & themes)
A simple, easily customizable Bootstrap-based theme that works well with custom post types and taxonomies.
Free planJapanese UI
linkding
Web Services & Online Tools
A minimal, fast, self-hosted bookmark manager that is easy to run with Docker. It offers tags, archiving, a REST API and browser extensions.
listmonk
Web Services & Online Tools
A self-hosted newsletter and mailing list manager that runs as a single binary with Postgres. It offers subscriber segmentation, campaign analytics and a transactional mail API.
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
Mastodon
Social & Communication
A free and open-source decentralized social media platform, described on its official site as radically different.
Free plan
Matrix
Social & Communication
An open protocol for secure decentralised communications, as its official site describes it, with open-source server implementations.
Mealie
Daily Life & Utilities
A self-hosted recipe manager and meal planner that can import recipes from URLs and build shopping lists.
Indie
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
Mermaid Live Editor
Web Services & Online Tools
An online editor that previews Mermaid flowcharts, sequence diagrams and more in real time, with SVG export and shareable links.
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
Monkeytype
Education & Learning
A minimalistic, customizable typing test website with many test modes and an account system that stores speed and accuracy history.
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
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
Paperless-ngx
Daily Life & Utilities
A community-supported document management system for scanning, indexing and archiving documents.
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
Photopea
Image, Photo & Design
A browser-based photo and image editor that opens PSD and 40+ other formats and says files are processed locally on the device.
AI
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
Pixelfed
Social & Communication
A free and open-source decentralized photo-sharing social media platform. The official site credits Dansup as the creator.
Pixelorama
Image, Photo & Design
An open-source pixel art editor for sprites, tiles and animations, running on Windows, Linux, macOS and the web.
Plane
Business & Operations
A project and knowledge management platform covering work items, cycles and a wiki. It is available as a cloud service or self-hosted via Docker or Kubernetes.
AI
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
Pochipp
WordPress (plugins & themes)
Search products on Amazon and Rakuten and manage affiliate links from within WordPress.
Free planJapanese UI
PrivacyPhoto
Image, Photo & Design
A browser-based tool for inspecting and removing GPS and other Exif data from photos; the page states photos are not sent to any server.
Japanese UI
PrivateBin
Web Services & Online Tools
A minimalist open-source pastebin that encrypts in the browser so the server cannot read stored content. It supports passwords, expiry and burn-after-reading.
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
RSSHub
Web Services & Online Tools
An open-source project that generates RSS feeds for sites that lack them, with many routes and public instances. The docs state it is released under AGPL-3.0.
Shaarli
Web Services & Online Tools
A self-hosted, single-user bookmark manager and link-sharing service that stores links in a file without a database. It supports tags, RSS/ATOM feeds and plugins.
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
Smalruby
Education & Learning
A programming learning environment, modelled on Scratch, where children build programs and robots with Ruby. It is developed by the NPO Ruby Programming Shounendan.
Japanese 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
Stoat
Social & Communication
An open-source group chat app for friends and communities with servers, channels, voice chat and file sharing. The official site states there are no ads or data mining.
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
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
Twenty
Business & Operations
An open-source CRM with custom objects, fields, views and no-code workflows, available self-hosted or as a managed cloud.
AI
UGTOP
Web Services & Online Tools
A Japanese-language site that publishes tools such as the "Kakunin-kun" environment checker. Its copyright notice reads "1997- ugtop".
Japanese UI
Umami
Web Services & Online Tools
An open-source web and product analytics platform that the official site says uses no cookies and collects no personal data. It covers custom events, funnels, session replay and more.
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
Vivliostyle
Web Services & Online Tools
An open-source CSS typesetting project for digital and web publishing. The site is available in Japanese and English, and a CLI is provided.
Japanese UI
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
wallabag
Web Services & Online Tools
A free, open-source, self-hostable read-it-later app that stores articles in your own archive. It supports imports from Pocket and others, plus apps and browser extensions.
WaniKani
Education & Learning
A web app that teaches kanji and vocabulary through mnemonics and spaced repetition, made by Tofugu.
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
Zenn
Web Services & Online Tools
A knowledge-sharing community for engineers where users can publish articles and books. Its tagline is 'Write for yourself.'
Japanese UI
Zotero
Education & Learning
A research tool for collecting, organizing, annotating and citing sources, developed by a nonprofit and free to use.
Free plan
Zulip
Social & Communication
An open-source team chat application for distributed teams, described on its official site as organized team chat.
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
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
ドリトル (Dolittle)
Education & Learning
A programming language designed for education. The official site says it is used in textbooks and supplementary materials for junior and senior high schools and in classes from elementary school to university.
Japanese 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
ビスケット (Viscuit)
Education & Learning
A visual programming language for kids built around a single concept, the glasses, to make pictures move and react.
Japanese 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
青空文庫
Web Services & Online Tools
An online digital library in Japanese. Works can be browsed by author and title, and usage rules are explained on the site.
Japanese UI