# TreadReader vs CarAi CarAssistant

The clearest difference is in-app purchases: TreadReader at none against CarAi CarAssistant's 4. CarAi CarAssistant's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CarAi CarAssistant sells 4 in-app purchases, starting at $1.99 per month. TreadReader asks for nothing beyond the download.

TreadReader ships an update every 5 weeks, CarAi CarAssistant every 2 weeks. The most recent releases landed on September 28, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | TreadReader | CarAi CarAssistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/treadreader/id1528184960/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 109 MB | 31 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [SNAP-ON EQUIPMENT INC](https://appshunter.io/developer/1375570882) | [ONLINE CLINIC YAZILIM LIMITED SIRKETI](https://appshunter.io/developer/1764740453) |

## What reviewers say

### TreadReader

[App page](https://appshunter.io/ios/app/treadreader/id1528184960)

This app controls a handheld scanner to perform 3D tire tread depth scans. It guides users through single or full vehicle scans, generating PDF summary reports that highlight uneven wear due to alignment, inflation, or suspension issues.

**Highlights:** Controls TreadReader Hand Held Scanner, Single and full vehicle tire scans, 3D tread depth measurements, Identifies uneven wear causes, Generates PDF Summary Reports, App setup and configuration

**Features:** macOS Compatibility

**In-app purchases:** none


### CarAi CarAssistant

[App page](https://appshunter.io/ios/app/carai-carassistant/id6751297322)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lite Monthly | $1.99 | per month |
| Pro Monthly | $4.99 | per month |
| Lite Yearly | $19.99 | per year |
| Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is TreadReader free?

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

### Is CarAi CarAssistant free?

CarAi CarAssistant is free to download, with in-app purchases available.

### Do TreadReader or CarAi CarAssistant have ads?

Neither TreadReader nor CarAi CarAssistant shows ads.

### Which is updated more often, TreadReader or CarAi CarAssistant?

TreadReader ships an update every 5 weeks, and CarAi CarAssistant every 2 weeks. Most recently, TreadReader was updated on September 28, 2026 and CarAi CarAssistant on September 27, 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.*