# Smart Belt Drive vs Strap Sentry

The clearest difference is update cadence: Strap Sentry at every 3 months against Smart Belt Drive's every 18 months. Smart Belt Drive's advantage is iOS requirement (13.4 vs 17.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Smart Belt Drive ships an update every 18 months, Strap Sentry every 3 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Smart Belt Drive | Strap Sentry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (13 ratings)](https://appshunter.io/ios/app/smart-belt-drive/id1093873727/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 14 MB | 14 MB |
| Requires iOS | **13.4** | 17.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HUTCHINSON](https://appshunter.io/developer/862345826) | [Strap Sentry Technologies, LLC](https://appshunter.io/developer/1791284564) |

## What reviewers say

### Smart Belt Drive

[App page](https://appshunter.io/ios/app/smart-belt-drive/id1093873727)

This application provides a comprehensive diagnostic tool for belt drive systems. It measures key parameters like pulley speeds, belt frequency, tension, and system geometry to ensure optimal performance, energy efficiency, and extended service life.

**Highlights:** Pulley rotary speed measurement, Belt frequency and tension measurement, System geometry and misalignment measurement, Comprehensive belt drive system check-up, Performance and energy efficiency analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### Strap Sentry

[App page](https://appshunter.io/ios/app/strap-sentry/id6740725851)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Smart Belt Drive free?

Smart Belt Drive is free to download, with no in-app purchases.

### Is Strap Sentry free?

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

### Do Smart Belt Drive or Strap Sentry have ads?

Neither Smart Belt Drive nor Strap Sentry shows ads.

### Which is updated more often, Smart Belt Drive or Strap Sentry?

Smart Belt Drive ships an update every 18 months, and Strap Sentry every 3 months. Most recently, Smart Belt Drive was updated on October 24, 2026 and Strap Sentry on October 28, 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.*