# Speed Tracker mach4 vs KDA Tracker & Joule Calc

The clearest difference is in-app purchases: Speed Tracker mach4 at none against KDA Tracker & Joule Calc's 1. Speed Tracker mach4 also leads on ads (none vs shown) and device support (4 vs 2). KDA Tracker & Joule Calc's advantage is update cadence (every 3 days vs every 6 weeks). On price there is nothing between them.

Both are free to download. KDA Tracker & Joule Calc sells 1 one-off in-app purchase. Speed Tracker mach4 asks for nothing beyond the download.

Speed Tracker mach4 ships an update every 6 weeks, KDA Tracker & Joule Calc every 3 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Speed Tracker mach4 | KDA Tracker & Joule Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/speed-tracker-mach4/id6446348164/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 78 MB | 40 MB |
| Requires iOS | **9** | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [nVisti](https://appshunter.io/developer/1058574940) | [Kamil Bobrowski](https://appshunter.io/developer/1788939427) |

## What reviewers say

### 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


### KDA Tracker & Joule Calc

[App page](https://appshunter.io/ios/app/kda-tracker-and-joule-calc/id6774669600)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads – Lifetime Access | $1.99 | one-time |


## Frequently asked questions

### Is Speed Tracker mach4 free?

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

### Is KDA Tracker & Joule Calc free?

KDA Tracker & Joule Calc is free to download, with in-app purchases available.

### Do Speed Tracker mach4 or KDA Tracker & Joule Calc have ads?

KDA Tracker & Joule Calc shows ads; Speed Tracker mach4 does not.

### Which is updated more often, Speed Tracker mach4 or KDA Tracker & Joule Calc?

Speed Tracker mach4 ships an update every 6 weeks, and KDA Tracker & Joule Calc every 3 days. Most recently, Speed Tracker mach4 was updated on November 3, 2026 and KDA Tracker & Joule Calc on November 6, 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.*