How many open-source wearable signal tools are listed?

234 tools: 51 PPG, 86 ECG, 54 IMU, 16 EEG, 15 EDA, 13 respiration and 2 temperature, plus 62 tagged as multi-signal. A tool that handles more than one signal is counted under each.

Which programming languages do these tools use?

Python (156), MATLAB (35), C (7), R (7), Java (4), Swift (4), Kotlin (3), Ruby (2), C++ (1), Dart (1) and JavaScript (1); 15 do not state a language. A tool that names more than one language is counted under each.

Can I use these tools in a commercial product?

It depends on each licence. Of the 234 tools, 205 list commercial use as yes, 13 as no and 16 do not state it. Each tool page shows the licence exactly as the project publishes it; read the licence in the project repository before you build on it.

How is maintenance shown?

By the date of the last commit to the project's repository, as of Oct 21, 2026: 104 have a commit in the last 12 months, 61 were last updated 1 to 3 years earlier and 69 have had no commit in over 3 years. An older last commit does not mean a tool no longer works.

How are Wearable Signal Tools different from the tools built by ChatPPG?

Wearable Signal Tools lists open-source software made by other teams. Tools built by ChatPPG are shown in their own section and are not included in these counts, filters or browse pages.

Wearable Signal Tools

Wearable Signal Tools: Open-Source PPG, ECG & IMU Software

234 open-source software projects for PPG, ECG, IMU, EEG, EDA, respiration and temperature signals from wearables. Filter by signal, category, language, licence, commercial use and maintenance.

All 234 open-source tools

Made here

Built by ChatPPG

5 tools made by ChatPPG. They are listed separately and are not counted in Wearable Signal Tools.

Perfusion Index CheckerExplains what PI means on a pulse oximeter and lets you compare a perfusion index with published values for healthy adults and newborns, or calculate it from the pulsatile (AC) and non-pulsatile (DC) parts of the signal. In 108 healthy adults the median PI was 1.4% with a middle 50% of 0.7–3.0% (Lima et al., 2002). It runs privately in the browser.Licence: Not stated · Commercial use: Not stated
PlethscapePlethscape is an interactive 3D physiology lab that runs in the browser. Pick a sensing site (finger, wrist, ear, temple, neck, upper arm or toe), change age, heart rate, arterial stiffness, perfusion and breathing rate, and watch a synthetic PPG stream and a labelled single beat respond. It includes a guided tour, rest/walk/run presets with simulated wrist motion and sensor noise, and BodyParts3D anatomy. The waveform is an analytical teaching model, not a measurement or a calibrated optical simulation.Licence: MIT · Commercial use: yes
ppg-jsppg-js is a zero-dependency JavaScript library that turns a phone camera, with a fingertip over the lens and flash, into a photoplethysmography sensor in the browser. Sessions are recorded and can be replayed offline through the same engine. It is published on npm as @sontakey/ppg-js and has a three-minute HRV spot-check demo app.Licence: MIT · Commercial use: yes
SpO2 at Altitude CheckerEnter an altitude to see the SpO2 range measured in healthy, acclimatised residents from 154 m to 5,100 m (Rojas-Camayo et al., 2018), with infant data, and optionally compare your own reading. In 6,289 healthy Andean residents the median SpO2 was 99% at 154 m, 96% at 2,500 m, 92% at 3,600 m, 87% at 4,100–4,500 m and 81% at 5,100 m. It is educational and runs privately in the browser.Licence: Not stated · Commercial use: Not stated
Wearable Validation ToolkitFree in-browser statistics for wearable validation studies. Paste paired device and reference readings to get Bland–Altman bias and limits of agreement with confidence intervals, a proportional-bias check, ICC (all six Shrout–Fleiss forms), MAE, MAPE and RMSE, Cohen's kappa with weighted variants for categorical outputs such as sleep stages, and a Lu et al. (2016) sample-size planner. Figures and BibTeX can be exported, and everything runs in the browser.Licence: Not stated · Commercial use: Not stated

Questions about Wearable Signal Tools

How many open-source wearable signal tools are listed?
234 tools: 51 PPG, 86 ECG, 54 IMU, 16 EEG, 15 EDA, 13 respiration and 2 temperature, plus 62 tagged as multi-signal. A tool that handles more than one signal is counted under each.
Which programming languages do these tools use?
Python (156), MATLAB (35), C (7), R (7), Java (4), Swift (4), Kotlin (3), Ruby (2), C++ (1), Dart (1) and JavaScript (1); 15 do not state a language. A tool that names more than one language is counted under each.
Can I use these tools in a commercial product?
It depends on each licence. Of the 234 tools, 205 list commercial use as yes, 13 as no and 16 do not state it. Each tool page shows the licence exactly as the project publishes it; read the licence in the project repository before you build on it.
How is maintenance shown?
By the date of the last commit to the project's repository, as of Oct 21, 2026: 104 have a commit in the last 12 months, 61 were last updated 1 to 3 years earlier and 69 have had no commit in over 3 years. An older last commit does not mean a tool no longer works.
How are Wearable Signal Tools different from the tools built by ChatPPG?
Wearable Signal Tools lists open-source software made by other teams. Tools built by ChatPPG are shown in their own section and are not included in these counts, filters or browse pages.

Listings, summaries, licences and commercial-use fields are shown as recorded for each project, as of Oct 21, 2026. Maintenance is computed from the date of the last commit. Check the licence in each project’s repository before you use it.