# IELTS Practice & Mock Tests vs OnBook

The clearest difference is update cadence: OnBook at every 5 days against IELTS Practice & Mock Tests's every 3 months. IELTS Practice & Mock Tests's advantage is iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. IELTS Practice & Mock Tests sells 3 in-app purchases, starting at $34.99 per month and OnBook sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

IELTS Practice & Mock Tests ships an update every 3 months, OnBook every 5 days. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | IELTS Practice & Mock Tests | OnBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 45 MB | 39 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TEST SUCCEED](https://appshunter.io/developer/1828860862) | [Jinyoung Jang](https://appshunter.io/developer/1888765890) |

## What reviewers say

### IELTS Practice & Mock Tests

[App page](https://appshunter.io/ios/app/ielts-practice-and-mock-tests/id6760332520)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Premium | $34.99 | per month |
| 6 Months Premium | $59.99 | per 6 months |
| 1 Year Premium | $99.99 | per year |


### OnBook

[App page](https://appshunter.io/ios/app/onbook/id6761301818)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ink 30 Pack | $2.99 | one-time |
| Ink 70 Pack | $4.99 | one-time |
| Ink 170 Pack | $9.99 | one-time |


## Frequently asked questions

### Is IELTS Practice & Mock Tests free?

IELTS Practice & Mock Tests is free to download, with in-app purchases available.

### Is OnBook free?

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

### Do IELTS Practice & Mock Tests or OnBook have ads?

Neither IELTS Practice & Mock Tests nor OnBook shows ads.

### Which is updated more often, IELTS Practice & Mock Tests or OnBook?

IELTS Practice & Mock Tests ships an update every 3 months, and OnBook every 5 days. Most recently, IELTS Practice & Mock Tests was updated on November 9, 2026 and OnBook on October 31, 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.*