# BITS Lab vs Sensory Arachne

The clearest difference is price: BITS Lab at Free against Sensory Arachne's $0.99. BITS Lab also leads on update cadence (every 2 months vs every 58 months) and iOS requirement (9.0 vs 16.4). On ads, in-app purchases and device support there is nothing between them.

BITS Lab is free to download; Sensory Arachne costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BITS Lab ships an update every 2 months, Sensory Arachne every 58 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | BITS Lab | Sensory Arachne |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.9 (16 ratings)](https://appshunter.io/ios/app/bits-lab-start/id1198658004/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 58 months |
| Monetization | Free | — |
| Size | 66 MB | 10 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Tara McAllister](https://appshunter.io/developer/1198658003) | [Sensory App House Ltd](https://appshunter.io/developer/1361994084) |

## What reviewers say

### BITS Lab

[App page](https://appshunter.io/ios/app/bits-lab-start/id1198658004)

This app uses visual biofeedback to help users, particularly children and adolescents, correct speech errors related to the American English 'r' sound. It offers guided practice, adaptive challenges, and progress tracking for effective speech therapy.

**Highlights:** Visual biofeedback for speech correction, Tutorial for biofeedback interpretation, Free play mode for 'r' practice, Adaptive quest mode for increasing difficulty, Quiz mode for progress tracking, Visual rewards for improvement, Clinician dashboard for progress monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### Sensory Arachne

[App page](https://appshunter.io/ios/app/sensory-arachne/id1554115040)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BITS Lab free?

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

### Is Sensory Arachne free?

Sensory Arachne costs $0.99, with no in-app purchases.

### Do BITS Lab or Sensory Arachne have ads?

Neither BITS Lab nor Sensory Arachne shows ads.

### Which is updated more often, BITS Lab or Sensory Arachne?

BITS Lab ships an update every 2 months, and Sensory Arachne every 58 months. Most recently, BITS Lab was updated on November 2, 2026 and Sensory Arachne on November 7, 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.*