Available on Google Play

Android tools,
built right.

Lightweight, ad-free Android utility apps designed to solve real problems. Clean code, clean design, nothing wasted.

Browse Apps About the dev
12+
apps published
50K
total downloads
4.7★
avg. rating
// featured
App of the month
Our most-downloaded app, built with Camera2 API and Material 3 design.
⭐ Editor's pick

Heart Rate Monitor

Measure your heart rate using just your phone's camera — no wearable needed. Uses PPG (photoplethysmography) technology for accurate readings, with a real-time graph and full history log backed by Room database.

Camera2 API PPG MVVM Room DB Material 3
Download Free
❤️
Heart Rate Monitor
// catalogue
All apps
❤️
Heart Rate Monitor
health
PPG-based heart rate detection using the phone camera. Real-time graph + history.
★ 4.8
Play
📋
Quick Notes
productivity
Fast notepad with categories, search, and offline support. No cloud required.
★ 4.6
Play
🔋
Battery Monitor
system
Track battery health, temperature, charge cycles, and voltage in real time.
★ 4.5
Play
📏
Unit Converter
utilities
Convert between 20+ unit categories — length, weight, temperature and more.
★ 4.7
Play
🔐
Password Gen
utilities
Generate strong, custom passwords. 100% offline. No permissions needed.
★ 4.9
Play
📡
Network Info
system
View your IP, DNS, WiFi signal strength, and live network statistics.
★ 4.4
Play
// dev blog
Latest posts
Behind-the-scenes dev notes, tips, and app updates.
❤️
tutorial Dec 2024
Building a Heart Rate Monitor with Camera2 API
How PPG works, why I chose Java over Kotlin, and how I solved the Lottie crash bug.
Read post →
⚙️
devnotes Nov 2024
MVVM + Room: the architecture I use for every app
A walkthrough of my standard project setup with Navigation Component and ViewModels.
Read post →
🚀
google play Oct 2024
Publishing my first app on the Play Store: a full guide
From APK to live listing — store listing tips, screenshots, and what I learned.
Read post →
// about

Independent Android developer.

I build small, focused Android utility apps — the kind that do one thing extremely well, load instantly, and never ask for unnecessary permissions.

Every app is built in pure Java, with clean MVVM architecture, Room database, and Material 3 UI — designed to work on real devices without issues.

Zero ads. No trackers, no analytics SDKs phoning home.
Minimal permissions. Every permission has a reason.
Offline-first. Apps should work without internet.
Real-device tested. No simulator-only releases.
tech stack
☕ Java
🏗 MVVM
🗄 Room DB
🎨 Material 3
🧭 Navigation
📷 Camera2
📊 MPAndroidChart
🔧 Android Studio
contact

Have feedback or a feature request for any app?

hello@toolkitstudio.dev