# IO vs Speed Tracker mach4

The clearest difference is review sentiment: Speed Tracker mach4 at 50% against IO's 0%. Speed Tracker mach4 also leads on device support (4 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

## The numbers

| Metric | IO | Speed Tracker mach4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/speed-tracker-mach4/id6446348164/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Monetization | Free | Free |
| Size | 11 MB | 78 MB |
| Requires iOS | 9.0 | 9 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Digitech Co., Ltd.](https://appshunter.io/developer/1281561834) | [nVisti](https://appshunter.io/developer/1058574940) |

## What reviewers say

### IO

[App page](https://appshunter.io/ios/app/io-hawk/id1531669334)

This app syncs with smart cycling hardware to display detailed riding data, manage your e-bike, and provide anti-theft features. It offers a user-friendly interface for tracking performance and staying connected on the go.

**Highlights:** Riding data synchronization, Detailed tour reports, E-bike management, Anti-theft alert, Bike locator, Phone call notifications

**In-app purchases:** none


### Speed Tracker mach4

[App page](https://appshunter.io/ios/app/speed-tracker-mach4/id6446348164)

Measure the speed of objects using Doppler radar technology. This app accurately tracks speeds from 250 to 1250 m/s with precision better than 0.1%. Available on various Apple devices.

**Highlights:** Doppler radar speed measurement, Speed range: 250-1250 m/s, Accuracy better than 0.1%, Supports Apple Watch, iPhone, iPad, iPod

**In-app purchases:** none


## Frequently asked questions

### Is IO free?

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

### Is Speed Tracker mach4 free?

Speed Tracker mach4 is free to download, with no in-app purchases.

### Do IO or Speed Tracker mach4 have ads?

Neither IO nor Speed Tracker mach4 shows ads.

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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.*