# Zerin vs Doctus

Zerin and Doctus are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Zerin sells 4 one-off in-app purchases and Doctus sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Zerin ships an update weekly, Doctus every 10 days. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Zerin | Doctus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Size | 67 MB | 93 MB |
| Requires iOS | **15** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [oznur aslan cinar](https://appshunter.io/developer/1850787591) | [Doctus App](https://appshunter.io/developer/1862751416) |

## What reviewers say

### Zerin

[App page](https://appshunter.io/ios/app/zerin/id6755254155)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Support | $0.99 | one-time |
| Medium Support | $1.99 | one-time |
| Big Support | $2.99 | one-time |
| Huge Support | $9.99 | one-time |


### Doctus

[App page](https://appshunter.io/ios/app/doctus-microlearning/id6756780930)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Doctus+ Monthly | $6.99 | per month |
| Doctus+ Yearly | $69.99 | per year |


## Frequently asked questions

### Is Zerin free?

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

### Is Doctus free?

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

### Do Zerin or Doctus have ads?

Neither Zerin nor Doctus shows ads.

### Which is updated more often, Zerin or Doctus?

Zerin ships an update weekly, and Doctus every 10 days. Most recently, Zerin was updated on October 7, 2026 and Doctus on October 3, 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.*