# Accelerometer ∞ vs decibella 2

The clearest difference is in-app purchases: decibella 2 at none against Accelerometer ∞'s 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Accelerometer ∞ sells 2 in-app purchases, starting at $1.99 per month. decibella 2 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 11, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Accelerometer ∞ | decibella 2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (65 ratings)](https://appshunter.io/ios/app/accelerometer/id6621273087/reviews)** | — |
| Number of ratings | **65** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 53 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Fawkes Wei](https://appshunter.io/developer/432767536) | [Jisu Jung](https://appshunter.io/developer/1731788096) |

## What reviewers say

### Accelerometer ∞

[App page](https://appshunter.io/ios/app/accelerometer/id6621273087)

Visualize device motion data in real-time with dynamic graphs. Analyze sensor information, calibrate your device, and explore various possibilities. This utility app offers a unique perspective on your device's movement.

**Highlights:** Real-time motion data visualization, Stunning graph displays, Sensor calibration, Data analysis, Explore endless possibilities

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Lifetime | $9.99 | one-time |


### decibella 2

[App page](https://appshunter.io/ios/app/decibella-2/id6768519741)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Accelerometer ∞ free?

Accelerometer ∞ is free to download, with in-app purchases available.

### Is decibella 2 free?

decibella 2 is free to download, with no in-app purchases.

### Do Accelerometer ∞ or decibella 2 have ads?

Both Accelerometer ∞ and decibella 2 show ads.

### Which is updated more often, Accelerometer ∞ or decibella 2?

Accelerometer ∞ ships an update every 2 weeks, and decibella 2 every 2 weeks. Most recently, Accelerometer ∞ was updated on October 11, 2026 and decibella 2 on October 4, 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.*