# Logger by Bonsai Systems® — A Versatile Sensor Data Logger

> Record and visualize live internal and Bluetooth sensor data. (iPhone/iPad app by Bonsai Systems GmbH.)

- Source: https://appshunter.io/ios/app/logger-by-bonsai-systems/id918338088 (this page in markdown: same URL + `.md`)
- Developer: [Bonsai Systems GmbH](https://appshunter.io/developer/918338087)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 4.50/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 127 MB
- Languages: English
- Released: 2018-08-02
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/logger-by-bonsai-systems/id918338088/reviews.md

## What is Logger by Bonsai Systems®?

Easily display and record live sensor data from internal sensors and sensors connected via Bluetooth.

Select among the available data sources and visualization options to freely combine them into your own, saveable configuration. The graph visualization supports different time scales and you can set an upper- and a lower threshold to get visual feedback when one of them is exceeded. The entire screen can be recorded into a video for later analysis and for sharing, and you can save the data streams to CSV files for sensors that support this feature.

Internal Sensors (Graph):
- Acceleration (3 Axes)
- Rotation Rate (3 Axes)
- Magnetic Field (3 Axes)
- Location

Internal Camera (Video):
- Front
- Back

Supported External Sensors (Bluetooth):
- Motion Capturing: QuantiMotion Full-Body Set
- Brass Players (Lip Force and Loudness): QuantiForce Brass
- Other Sensors by Bonsai Systems

## Key features

- Live sensor data display
- Bluetooth sensor support
- Customizable graph visualizations
- Video recording of screen
- CSV data export
- Threshold alerts

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Magnetic Field Sensing | $1.99 | one-time |
| Location Sensing | $1.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/logger-by-bonsai-systems/id918338088/reviews.md

### 5/5 — Finally, a GOOD SENSOR APP!

*2020-05-24, version 1.1.2*

Thank you so much! This app is amazing! I have been looking everywhere for an app with a linear accelerometer, or rotation force. Thank you!!

## Frequently asked questions about Logger by Bonsai Systems®

### What internal sensors does Logger support?

Logger supports internal sensors for acceleration (3 axes), rotation rate (3 axes), magnetic field (3 axes), and location. It also utilizes the front and back cameras for video recording.

### Can Logger connect to external Bluetooth sensors?

Yes, Logger supports external sensors via Bluetooth, including motion capturing sets like QuantiMotion Full-Body Set and brass player sensors like QuantiForce Brass, as well as other sensors by Bonsai Systems.

### How can I save my recorded data with Logger?

You can save the entire screen recording as a video for later analysis and sharing. Additionally, data streams can be saved to CSV files for sensors that support this feature.

### Does Logger offer any alerts or notifications?

Yes, the graph visualization in Logger supports setting upper and lower thresholds. You will receive visual feedback when one of these thresholds is exceeded.

### What is the rating and age appropriateness of Logger?

Logger has a high rating of 4.5 stars from 2 ratings. It is suitable for users aged 4 and up.

### On which devices can I use Logger?

Logger is available for iPhone, iPad, and iPod devices.

### How often is Logger updated?

The latest version of Logger is 2.1, and it was last updated on April 14, 2023. This indicates regular maintenance and potential feature additions.

### Does Logger have ads?

The provided data does not explicitly state whether Logger has ads. However, it does mention in-app purchases, suggesting a freemium model.

## Version history (last 5 releases)

### 2.1 — 2023-04-14

- Supporting 32-bit devices running iOS 9 or newer

### 2.0 — 2021-11-01

This version supports all our newest sensor types and it contains many internal improvements and optimizations.

The internal sensors of the iOS device, like accelerometer, gyroscope, magnetometer, and location, can now be recorded to CSV-formatted files.

### 1.1.2 — 2019-12-04

We fixed an issue that sometimes made the recording to fail when screen recording was enabled. And the app now properly informs you (instead of crashing) when microphone access is required but you did not allow it.

### 1.1.1 — 2019-11-11

There are quite a few improvements in this version:
- When using QuantiForce Brass you get a summary of force and loudness statistics after completing a recording. Compare the summaries to track progress and share them as you like.
- All your recordings are now accessible directly from the start screen and are nicely grouped by sensor type.
- The battery level and the estimated remaining time are displayed on the options screen ((i)-button).
- Each visualizer now displays the name of the sensor node that provides the data in the top right corner.
- We eliminated several bugs and made everything run smooth with iOS 13.

### 1.1 — 2019-08-15

We were digging a lot under the hood to make the user experience even better and to support our newest sensors such as QuantiForce Brass LIVE.

## Apps similar to Logger by Bonsai Systems®

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| [RDS-32](https://appshunter.io/ios/app/rds-32/id1623034787) | 5.0 (1) | Free | Utilities |
| [Device Motion Detective](https://appshunter.io/ios/app/device-motion-detective/id884501447) | 1.0 (1) | Free | Utilities |
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| [HemiPhysioData](https://appshunter.io/ios/app/hemiphysiodata/id1502983547) | — | Free | Utilities |
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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*