# OTR Prep vs Dental Assistant Prep

The clearest difference is update cadence: Dental Assistant Prep at fortnightly against OTR Prep's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OTR Prep sells 1 one-off in-app purchase and Dental Assistant Prep sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

OTR Prep ships an update every 5 months, Dental Assistant Prep fortnightly. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OTR Prep | Dental Assistant Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Size | 21 MB | 9 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [iAPPSSTUDIO](https://appshunter.io/developer/1830642259) | [Hermes Inteligencia Digital Ltda](https://appshunter.io/developer/1896694873) |

## What reviewers say

### OTR Prep

[App page](https://appshunter.io/ios/app/otr-prep-nbcot-practice-test/id6760580880)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Lifetime Access | $7.99 | one-time |


### Dental Assistant Prep

[App page](https://appshunter.io/ios/app/dental-assistant-prep-exam/id6789206521)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dental Assistant Prep Weekly | $3.99 | per 7 days |
| Dental Assistant Prep Monthly | $10.99 | per month |
| Quarterly | $21.99 | per 3 months |


## Frequently asked questions

### Is OTR Prep free?

OTR Prep is free to download, with in-app purchases available.

### Is Dental Assistant Prep free?

Dental Assistant Prep is free to download, with in-app purchases available.

### Do OTR Prep or Dental Assistant Prep have ads?

Neither OTR Prep nor Dental Assistant Prep shows ads.

### Which is updated more often, OTR Prep or Dental Assistant Prep?

OTR Prep ships an update every 5 months, and Dental Assistant Prep fortnightly. Most recently, OTR Prep was updated on October 8, 2026 and Dental Assistant Prep 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.*