# Tech vs Sime

The clearest difference is iOS requirement: Tech at 13.0 against Sime's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Tech ships an update monthly, Sime fortnightly. The most recent releases landed on October 21, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Tech | Sime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (87 ratings)](https://appshunter.io/ios/app/tech-air-app/id1504440133/reviews)** | — |
| Number of ratings | **87** | — |
| Positive reviews | 13.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free | — |
| Size | 151 MB | 55 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ALPINESTARS SPA](https://appshunter.io/developer/1499986821) | [SIME-TEK SPA](https://appshunter.io/developer/1893587420) |

## What reviewers say

### Tech

[App page](https://appshunter.io/ios/app/tech-air-app/id1504440133)

Easily register and monitor your motorcycle airbag system's status and battery life. Track ride details, record location and speed, and relive your journeys with detailed maps and statistics. Build a library of your rides and manage system settings.

**Highlights:** Register Tech-Air® 5 Airbag System, Monitor system status and battery life, Track ride details with location and speed, Record and visualize ride statistics, Build a library of recorded rides, Disable system for off-road riding, Update system firmware

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ Successful firmware updates when working properly
- 📍 Ride tracking and route recording functionality
- 🔋 Battery level monitoring
- ⚡ Quick pairing when conditions are optimal
- 🎯 Simple and intuitive UI design

**What reviewers complain about**

- 🐛 Constant disconnection issues between app and vest
- 📡 Extremely limited Bluetooth range (requires phone within 5cm of vest)
- 🔐 Registration and verification SMS not received in multiple regions
- ❌ Firmware update failures stuck at 2-3%
- ⚠️ App crashes on startup after updates

**Reported bugs**

- App crashes immediately upon launch after updates
- Firmware update stuck at 2% indefinitely
- Error 12 during firmware installation
- Verification SMS not arriving (especially for +420 Czech numbers and other regions)
- QR code scanner not recognizing codes

**Requested features**

- PC/desktop application for firmware updates
- Lean angle tracking and display
- Maximum speed recording in ride logs
- Acceleration metrics in ride data
- Altitude data in ride tracking


### Sime

[App page](https://appshunter.io/ios/app/sime-tek-service/id6762262355)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tech free?

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

### Is Sime free?

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

### Do Tech or Sime have ads?

Neither Tech nor Sime shows ads.

### Which is updated more often, Tech or Sime?

Tech ships an update monthly, and Sime fortnightly. Most recently, Tech was updated on October 21, 2026 and Sime on October 2, 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.*