PureHub

Small, practical utilities for focus, measurement, scanning, documents, privacy, audio, and personal finance.
Free to use. No ads. No mandatory account. Open source.

Open the web app · Browse all tools · Download Android · Releases · Community updates

What is PureHub?

PureHub is an offline-first utility collection for Android and the web. Instead of installing many single-purpose apps filled with advertising and tracking, you get 25 practical tools plus one community hub in a consistent interface.

Typical uses include scanning or creating a QR code, running a Pomodoro session, extracting text from an image, converting units, checking a level or compass, splitting a bill, tracking expenses, and following a guided breathing exercise.

PureHub is currently beta software. The web app is available now, and signed Android preview builds are published through GitHub Releases.

The flagship lineup now includes the Zen tools, QR Studio, the OCR + PDF Document Suite, Speaker Cleaner, the private Finance Suite, and the Compass + Level + Sound Sensor Suite.

Zen Habit, Zen Pomodoro, and Zen Breath now share a complete Zen Suite experience on web and Android. Pomodoro includes quick/custom focus sessions, private weekly rhythm tracking, and local soundscapes; Breath includes timed goals, accessible motion, optional cues, and private completion history.

Try it now

Start with the highest-demand workflows:

• Bubble Level — flat and edge modes, local zero calibration, adjustable tolerance, and private sensor readings.
• QR Studio — inspect, scan, create, and keep useful codes locally.
• OCR Studio — turn camera pages into editable text and searchable PDF without a cloud account.
• Download Android — signed APKs, checksums, and architecture-specific builds.

Destination	Link
Homepage	hub.blissbiovn.com/en
Complete tool catalog	hub.blissbiovn.com/en/tools
Android APK and checksum	hub.blissbiovn.com/en/download
Changelog	hub.blissbiovn.com/en/changelog
Community and feedback	hub.blissbiovn.com/en/community

The 26 mini-app experiences

Category	Included tools
Zen & Time	Lunar Calendar, Zen Habit, Zen Pomodoro, Zen Breath
Measure & Tools	Compass, Bubble Level, Decibel Meter, Smart Flashlight, Unit Converter
Vision & Documents	QR Studio, Doc to PDF, OCR Studio, Color Grabber, Photo Privacy
Security & Audio	Speaker Cleaner, Deep Cleaner, Wi-Fi Analyzer, Password Vault, Wallpaper Changer
Files & Creator	Authenticator Vault, File Studio, Screen Recorder
Finance & Community	Bill Splitter, Expense Tracker, Decision Wheel, PureHub Community

Some tools depend on device capabilities such as a camera, microphone, motion sensor, storage access, or location permission. Availability and precision can differ by browser and device.

Product preview

One calm home

All tools

Zen Pomodoro

Why this project exists

• Free and ad-free: no banner ads, interstitials, subscriptions, or surprise paywalls.
• Privacy-first: local processing and on-device storage are preferred whenever the platform allows it.
• Offline-first: the PWA caches its application shell; the Android app deliberately removes the INTERNET permission from release builds.
• Open source: product decisions, releases, security limitations, and implementation are visible here.
• Community-built: bug reports, device testing, roadmap votes, and contributions shape what gets improved next.

Privacy-first does not mean every feature has completed an independent security audit. In particular, Password Vault is experimental; read SECURITY.md and the internal vault review before storing sensitive data.

Platforms and architecture

Surface	Stack	Purpose
Web/PWA	React 19, TypeScript, Vite, Tailwind CSS	Installable multilingual web experience with offline support
Android	Kotlin, Jetpack Compose, CameraX, Room, ZXing, ML Kit/Tesseract flavors	Native offline-first app for Android 8.0+
Hosting/automation	Vercel, GitHub Actions	Web deployment, CI, signed Android releases, checksums, and privacy gates

The public app supports English, Vietnamese, and Chinese routes. User content is stored locally for tools designed around private on-device workflows. The operator backend is deployed separately from a private repository and is not required to use the mini apps.

Run locally

Web app

Requirements: Node.js 24+ and npm.

cd pwa
npm install
npm run dev

Quality checks:

cd pwa
npm run lint
npm run build

Android app

Requirements: JDK 17 and the Android SDK for API 36.

./gradlew testStandardDebugUnitTest lintStandardDebug assembleStandardDebug
./gradlew testFdroidDebugUnitTest lintFdroidDebug assembleFdroidDebug

On Windows PowerShell:

.\gradlew.bat testStandardDebugUnitTest lintStandardDebug assembleStandardDebug
.\gradlew.bat testFdroidDebugUnitTest lintFdroidDebug assembleFdroidDebug

The standard flavor keeps ML Kit OCR for recognition quality. The fdroid flavor uses ZXing and Tesseract and its runtime dependency graph contains no ML Kit, Google Play Services, or Firebase. See the F-Droid flavor architecture and verification guide. APKs are written under app/build/outputs/apk/<flavor>/debug/. Production signing credentials are intentionally not stored in the repository; see ANDROID_RELEASE_CHECKLIST.md.

Official F-Droid submission is tracked directly through fdroiddata; PureHub does not claim a listing until a public F-Droid package page exists. Google Play is intentionally deferred until at least October 16, 2026 and will proceed only if tester coverage and every launch goal are complete. See the distribution submission dossier.

Repository map

Path	Contents
pwa/	React PWA, mini-app surfaces, localization, SEO, and public pages
app/	Native Android application
.github/workflows/	Web and Android CI plus signed release pipelines
docs/	Security and community-operation documentation
marketing/	Brand assets, screenshots, and reproducible demo-video tooling

Releases

The current preview is PureHub 1.0.0-beta.42. This reliability release validates the YouTube queue before upload, gives TikTok uploads stable sequential queue numbers, reports Deep Cleaner cache results accurately, and retains beta.41's security hardening. The standard flavor remains offline-first while retaining Internet access only for explicitly connected workflows such as the Minigame and update checks. The F-Droid flavor remains strictly offline-only and replaces ML Kit OCR with Tesseract. Signed Android artifacts are published through GitHub Releases after CI, scanner checks, and physical-device verification. Each Android release provides:

• a signed APK for testers;
• an AAB for future store distribution;
• SHA256SUMS.txt for integrity verification;
• build provenance generated by GitHub Actions.

Android releases are prereleases while device coverage, accessibility, and workflows continue to mature. Download only from the PureHub download page or this repository.

Contributing and feedback

You do not need to write code to help. Useful contributions include:

• reporting the device, browser/app version, tool, and exact reproduction steps for a bug;
• testing a release APK and describing where the UI feels unclear;
• suggesting a focused improvement to an existing tool;
• improving translations, accessibility, tests, documentation, or implementation.

Start with CONTRIBUTING.md, use the issue templates, or join the Telegram update channel. Please follow the Code of Conduct. Security issues must follow SECURITY.md, not a public issue.

Current direction

The immediate priorities are reliability on real devices, deeper workflows for the most-used tools, accessibility, honest privacy boundaries, and community feedback. PureHub will remain free, ad-free, and open source.

See the original 22-app flagship report for the previous catalog milestone, verification results, and video campaign status.

License

PureHub is available under the MIT License.