Dev tools · alternatives · 2026
24 alternatives to Open-source Android app to record raw data from Polar devices
There seemed to be no open source app yet to record raw biosignals from polar devices, so I build one. It’s aimed at researchers, developers, and anyone interested in working with raw biometric signals. Would love any feedback!
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites.
- 1
Automatically track your journeys on a stunning map 🌍
2016 · play.google.com · its alternatives →
- 2
Build live prototypes faster using mobile device sensor data
2021 · moonsense.io · its alternatives →
- 3IM
Hey HN, after the app I actually used to track my period wanted me to log in and save my data in the cloud, I decided to write my own. Most apps in this area are based on a subscription model and display far too much information anyway. For me, a simple calendar is enough where I can add a few notes if necessary. So that is the result of my work - a simple design and the data is only saved on the smartphone.
2024 · play.google.com · its alternatives →
- 4IMI made a tiny camera with super long battery lifefrom $200/mo▲843
Hey HN! A few years ago someone kept trying to steal my motorcycle, so I decided to make a small camera with really long battery life to catch them. The hardware/software is totally open source, but the companion app only supports macOS currently. (I'm a big fan of native apps, and didn't want to block releasing on Linux/Windows support.) I wrote some blog posts about the process: PCB design: https://toaster.llc/blog/pcb Enclosure design: https://toaster.llc/blog/enclosure Image pipeline:…
2024 · toaster.llc · its alternatives →
- 5
Open Wearables▲631Hi, I'm Bart, one of the maintainers of Open Wearables. For the past few months we've been building an open-source, self-hosted backend that normalises health and fitness data from multiple wearable providers (Garmin, Whoop, Apple Health, Samsung Health and others) into a single AI-ready REST API - and thought it was worth sharing here too :) We built this out of our own experience doing custom wearable integrations for clients, and from working with paid SaaS solutions that often lack the flexibility to customise data pipelines or debug what's actually happening under the hood.…
Apr 2026 · openwearables.io · its alternatives →
- 6
- 7
Polarsteps▲131Automatically track your journeys on a stunning map
2015 · polarsteps.com · its alternatives →
- 8
Polar Habits▲615Build lasting habits without the guilt of broken streaks
2024 · polarhabits.com · its alternatives →
- 9
A few years ago, right after high school, I decided to try to make a simultaneous translation app for Android as a side project, it took longer than expected (about 2 years) and I had to make a lot of compromises (I had to use Google's API and therefore make users use a developer key because at the time there were no free solutions for speech recognition and translation that had good quality). At the end of university, I decided to pick it up again and finally, using OpenAi's Whisper for speech recognition and Meta's NLLB for translation (with both running locally on the phone), I managed to…
2024 · github.com · its alternatives →
- 10OS
2011 · market.android.com · its alternatives →
- 11
Professional photo editor designed for everyone
2015 · play.google.com · its alternatives →
- 12IM
2022 · telegie.com · its alternatives →
- 13
- 14
Hey HN, I built MBCompass, a lightweight, privacy-friendly compass app for Android. It works fully offline, doesn’t ask for unnecessary permissions (no GPS, no internet), and is open source. Most compass apps out there are bloated or ad-heavy. I wanted something clean, fast, and featurish. So I made this! It’s only ~1.7 in size and uses a low-pass filter to smooth sensor readings. I’d love feedback or thoughts – especially from others building simple, privacy-first apps! https://f-droid.org/packages/com.mubarak.mbcompass/…
2025 · github.com · its alternatives →
- 15
Hey HN, This is a follow-up to our original Show HN post, where I launched the first version of MBCompass. https://news.ycombinator.com/item?id=44155741 Since then, I've added several features based on user feedback and community input... I just released v1.1.9 of MBCompass - Minimal, FOSS compass and navigation app. New in this version: - Theme toggling (Dark/Light) controlled via settings - Fix current location arrow visibility - Compass accuracy alerts - Sensor status indicator - Explicit button for showing the GPS current location - Smooth transitions and many more..…
Jan 2026 · github.com · its alternatives →
- 16
On-device or Cloud transcription powered by OpenAI's Whisper
2023 · apps.apple.com · its alternatives →
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GoPolar▲154Track your cold plunge & sauna sessions + share with others
2025 · gopolar.app · its alternatives →
- 19
Hi HN - My name is Andrew, and I'm a high school student. This is a write-up on StratoSpore, a payload I designed and launched to the stratosphere. The goal was to test if we could estimate physical altitude based on algae fluorescence (using a lightweight ML model trained on the sensor data). The blog post covers the full engineering mess/process, including: - The Hardware: Designing PCBs for the AS7263 spectral sensor and Pi Zero 2 W. -The biological altimeter: How I tried to correlate biological stress (fluorescence) with altitude. - The Communications: A custom lossy compression…
Nov 2025 · radi8.dev · its alternatives →
- 20
Crisp images, geo-stamped
2024 · play.google.com · its alternatives →
- 21
A big collection of open-source electronics projects
2016 · play.google.com · its alternatives →
- 22
DU Recorder▲69Record your life with phone. A screen recorder for Android.
2017 · play.google.com · its alternatives →
- 23
Transform your phone into a Polaroid-like, instant camera
2015 · its alternatives →
- 24
Hi HN, I recently shared this on r/BCI and wanted to see what the engineering community here thinks. A while back, I got frustrated with the state of accessible BCI hardware. Research gear was wildly unaffordable. So, I spent a ton of time designing a custom board, software and firmware to bridge that gap. I call it the Cerelog ESP-EEG. It is open-source (Firmware + Schematics), and I designed it specifically to fix the signal integrity issues found in most DIY hardware. I believe in sharing the work. You can find the Schematics, Firmware, and Software setup on the GitHub repo: GITHUB…
Jan 2026 · github.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →