# Z21Updater vs Dremel

The clearest difference is rating: Z21Updater at 5.0 against Dremel's 4.4. Z21Updater also leads on review sentiment (50% vs 21%) and iOS requirement (13.4 vs 18.0). Dremel's advantage is update cadence (every 2 months vs every 28 months) and ratings volume (19 vs 1). 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.

Z21Updater holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Dremel has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Z21Updater's written reviews are positive against 21% of Dremel's.

Z21Updater ships an update every 28 months, Dremel every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Z21Updater | Dremel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/z21updater/id1463533460/reviews)** | [4.4 (19 ratings)](https://appshunter.io/ios/app/dremel/id1577928986/reviews) |
| Number of ratings | 1 | **19** |
| Positive reviews | **50.0% of reviews** | 21.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 29 MB | 193 MB |
| Requires iOS | **13.4** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Modelleisenbahn GmbH](https://appshunter.io/developer/533805542) | [Bosch US](https://appshunter.io/developer/1200374538) |

## What reviewers say

### Z21Updater

[App page](https://appshunter.io/ios/app/z21updater/id1463533460)

Easily update your Z21, z21, z21start, and smartRail devices. The app automatically detects connected hardware and fetches the latest firmware directly from the server when online, simplifying the update process.

**Highlights:** Automatic device recognition, Direct server updates, Simple and functional update process, Supports Z21, z21, z21start, smartRail

**In-app purchases:** none


### Dremel

[App page](https://appshunter.io/ios/app/dremel/id1577928986)

This app connects to a smart rotary tool to provide usage insights, performance alerts, and speed recommendations. It helps users find the right accessories and settings for their projects, monitor tool battery life, and manage tool health.

**Highlights:** Bluetooth pairing with smart rotary tool, Accessory and speed recommendations, Tool dashboard with battery and usage time, Performance alerts and preventative tips, Accessory guides for various Dremel tools, Material guide for rotary tool accessories

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Z21Updater free?

Z21Updater is free to download, with no in-app purchases.

### Is Dremel free?

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

### Which has better reviews, Z21Updater or Dremel?

Z21Updater is rated higher. Z21Updater averages 5.0 out of 5 from 1 ratings, while Dremel averages 4.4 from 19 ratings.

### Do Z21Updater or Dremel have ads?

Neither Z21Updater nor Dremel shows ads.

### Which is updated more often, Z21Updater or Dremel?

Z21Updater ships an update every 28 months, and Dremel every 2 months. Most recently, Z21Updater was updated on October 24, 2026 and Dremel on October 24, 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.*