WhenDo vs Senstream
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WhenDo
This tool provides a graphical programming environment for learning Arduino. It simplifies coding by allowing users to drag and combine blocks to create programs. The app supports wireless downloads to compatible Arduino devices and utilizes a cloud server for compilation.
- Graphical programming with drag-and-drop blocks
- Clear logic structure (When, Centre Node, Do blocks)
- Cloud server compilation
- Wireless BLE downloads
- Compatible with Bluetooth 4.0 Arduino chips
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This is the most comprehensive graphical programming and developing tool based on Arduino. WhenDo is the most sufficient way to learn about Arduino and every basic programming logic. WhenDo is compatible with all the Arduino chips that have Bluetooth 4.0 module . Significant Features: 1. Graphical programming In this graphical programming language, user just need to drag condition and execute blocks and freely combine them. This development tool applies many amusing functions that the Arduino can accomplish in WhenDo. 2. Clear and meticulous logic Each sentence involves three elements: When block ( condition setting), Centre Node (combine When & Do block) and Do block ( execute setting ). Besides, the whole interactive User Interference environment is a big loop, which repeatedly run the program statements. 3. Cloud server compile Excellent file transfer and compile based on a Ubuntu server. Remote access to various libraries to improve its capability. 4. BLE download Wireless download the program through blueTooth 4.0 Arduino devices.
Senstream
This app records physiological signal data from a wearable ring, capturing electrodermal activity, ECG, PPG, temperature, and motion. It connects to the cloud for powerful data analysis, enabling new types of research.
- Electrodermal activity (EDA/GSR) capture
- ECG and PPG data recording
- Temperature and motion sensing
- Mobile and cloud data synchronization
- BIOPAC integration
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RESEARCH RING: LAB GRADE PHYSIOLOGICAL DATA ACQUISITION PLEASE NOTE: The Senstream Researcher Ring is not a medical device and is not intended to diagnose, treat, cure, monitor, or prevent medical conditions or illnesses. The app is designed to record physiological signal data, but not to make medical decisions. Multi-Sensor: Electrodermal activity (EDA, aka GSR), ECG, PPG, temperature and motion, captured from a single, user friendly device with long battery life. Electrodermal Data: Our initial product is the first ring form factor device that captures electrodermal activity with lab quality, enabling new types of research. ECG and/or Pulse: Capture electrocardiograph (ECG) and/or photoplethysmograph (PPG) data, depending on the specific needs of a study or application. Temperature and Motion: Capture temperature data from the finger, and contextualize physiological data with motion data captured by the Research Ring. Mobile and Cloud Apps: Start capturing data with just a ring and mobile app, which seamlessly connects to the cloud. BIOPAC integration offers powerful tools. Bold Vision: The Senstream roadmap, supported by a rich patent portfolio, leverages the convenience and unique physiology of the finger. Stay tuned!
Screenshots
Verdict
The clearest difference is update cadence: WhenDo at monthly against Senstream's every 3 months. WhenDo also leads on iOS requirement (8.1 vs 17.6). Senstream's advantage is device support (4 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
WhenDo ships an update monthly, Senstream every 3 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.
| Parameter | WhenDo | Senstream |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (3 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | — | 3 — better |
| Update frequency | Monthly — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, Mac, Vision Pro — better |
| Requires iOS | 8.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 22 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Shanghai Zhiwei Robotics Co Ltd | Senstream, Inc. |
Customer experience
WhenDo
Senstream
In-app purchases
WhenDo
No in-app purchases
Senstream
No in-app purchases









