# SensorLog vs buckle. Companion App

The clearest difference is price: buckle. Companion App at Free against SensorLog's $2.99. buckle. Companion App also leads on in-app purchases (none vs 4) and update cadence (weekly vs every 2 months). SensorLog's advantage is device support (3 vs 1). On ads and iOS requirement there is nothing between them.

buckle. Companion App is free to download; SensorLog costs $2.99 up front. SensorLog sells 4 one-off in-app purchases. buckle. Companion App asks for nothing beyond the download.

SensorLog ships an update every 2 months, buckle. Companion App weekly. The most recent releases landed on October 22, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SensorLog | buckle. Companion App |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.4 (41 ratings)](https://appshunter.io/ios/app/sensorlog/id388014573/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 69.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 16 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bernd Thomas](https://appshunter.io/developer/385441510) | [David Banziger](https://appshunter.io/developer/1802904084) |

## What reviewers say

### SensorLog

[App page](https://appshunter.io/ios/app/sensorlog/id388014573)

Record and stream sensor data from your iPhone, iPad, and Apple Watch. Export data in CSV or JSON format, or send it via TCP, UDP, or HTTP requests. Integrates with Core ML models for advanced analysis.

**Highlights:** Log sensor data up to 100Hz, Stream data via TCP/UDP or HTTP, Export data as CSV or JSON, Remote client/server functionality, Siri and Shortcuts integration, Core ML model support, HealthKit data export from Apple Watch

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a Coffee ... | $0.99 | one-time |
| Spend me an Ice Cream ... | $1.99 | one-time |
| Offer me a glas of Wine ... | $5.99 | one-time |
| Invite me for a Cocktail ... | $9.99 | one-time |


### buckle. Companion App

[App page](https://appshunter.io/ios/app/buckle-companion-app/id6746700416)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SensorLog free?

SensorLog costs $2.99, and also offers in-app purchases.

### Is buckle. Companion App free?

buckle. Companion App is free to download, with no in-app purchases.

### Do SensorLog or buckle. Companion App have ads?

Neither SensorLog nor buckle. Companion App shows ads.

### Which is updated more often, SensorLog or buckle. Companion App?

SensorLog ships an update every 2 months, and buckle. Companion App weekly. Most recently, SensorLog was updated on October 22, 2026 and buckle. Companion App on October 5, 2026.

---

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