# DT vs Echo

The clearest difference is update cadence: DT at every 2 weeks against Echo's every 3 months. 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.

DT ships an update every 2 weeks, Echo every 3 months. The most recent releases landed on September 14, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | DT | Echo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Size | 176 MB | 59 MB |
| Requires iOS | **14.2** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tactile Robotics Ltd.](https://appshunter.io/developer/1514487210) | [Wail Ashraf](https://appshunter.io/developer/1583763302) |

## What reviewers say

### DT

[App page](https://appshunter.io/ios/app/dt-prepscanner-plus/id6478564727)

**Features:** Vision Pro support

**In-app purchases:** none


### Echo

[App page](https://appshunter.io/ios/app/echo-dent/id6753124614)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DT free?

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

### Is Echo free?

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

### Do DT or Echo have ads?

Neither DT nor Echo shows ads.

### Which is updated more often, DT or Echo?

DT ships an update every 2 weeks, and Echo every 3 months. Most recently, DT was updated on September 14, 2026 and Echo on September 20, 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.*