# Stemoscope vs Keikku

The clearest difference is review sentiment: Keikku at 100% against Stemoscope's 14%. Keikku also leads on rating (4.0 vs 2.7). Stemoscope's advantage is ratings volume (16 vs 4) and iOS requirement (9.0 vs 14.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Keikku holds the better App Store score, 4.0 against 2.7. Both are backed by a comparable volume of ratings — 16 and 4 respectively. Written reviews point the same way: 14% of Stemoscope's written reviews are positive against 100% of Keikku's.

Stemoscope ships an update every 3 weeks, Keikku fortnightly. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Stemoscope | Keikku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (16 ratings)](https://appshunter.io/ios/app/stemoscope/id1448663751/reviews) | **[4.0 (4 ratings)](https://appshunter.io/ios/app/keikku/id1635629709/reviews)** |
| Number of ratings | **16** | 4 |
| Positive reviews | 14.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 19 MB | 208 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Shanghai Hulu Devices Co Ltd](https://appshunter.io/developer/1053971681) | [keikku](https://appshunter.io/developer/1635629711) |

## What reviewers say

### Stemoscope

[App page](https://appshunter.io/ios/app/stemoscope/id1448663751)

This app allows users to listen to various body sounds wirelessly via a small, wearable device. It's designed for STEM education, recreation, and general appreciation of life's sounds, offering features like sound recording, sharing, and playback speed adjustment.

**Highlights:** Wireless Bluetooth audio transmission, Record and save sounds, Share recordings via email, Playback at half speed, STEM mode for infrasound detection, Customizable sound filters and pitch shifting

**Features:** macOS Compatibility

**In-app purchases:** none


### Keikku

[App page](https://appshunter.io/ios/app/keikku/id1635629709)

Transform your smartphone into a diagnostic tool for heart sounds. Visualize, analyze, and track heartbeats with detailed waveforms and spectrograms. Securely manage and share recordings for enhanced patient care or personal health monitoring.

**Highlights:** Real-time heart sound visualization, Accurate heart sound tracking, Seamless data management, User-friendly interface, Waveform and spectrogram analysis, Secure recording storage and sharing

**In-app purchases:** none


## Frequently asked questions

### Is Stemoscope free?

Stemoscope is free to download, with no in-app purchases.

### Is Keikku free?

Keikku is free to download, with no in-app purchases.

### Which has better reviews, Stemoscope or Keikku?

Keikku is rated higher. Stemoscope averages 2.7 out of 5 from 16 ratings, while Keikku averages 4.0 from 4 ratings.

### Do Stemoscope or Keikku have ads?

Neither Stemoscope nor Keikku shows ads.

### Which is updated more often, Stemoscope or Keikku?

Stemoscope ships an update every 3 weeks, and Keikku fortnightly. Most recently, Stemoscope was updated on October 6, 2026 and Keikku on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*