# Check Answer vs SiS4School

The clearest difference is in-app purchases: SiS4School at none against Check Answer's 4. SiS4School also leads on iOS requirement (15.1 vs 18.6). Check Answer's advantage is update cadence (every 4 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Check Answer sells 4 in-app purchases, starting at $0.99 per month. SiS4School asks for nothing beyond the download.

Check Answer ships an update every 4 days, SiS4School every 2 weeks. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Check Answer | SiS4School |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 3 MB | 42 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jatuphol Jaturapat](https://appshunter.io/developer/1788860463) | [SIS SOFTTECH COMPANY LIMITED](https://appshunter.io/developer/6779064403) |

## What reviewers say

### Check Answer

[App page](https://appshunter.io/ios/app/check-answer/id6756690225)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited use (1 Month) | $0.99 | per month |
| Unlimited Use (3 Months) | $2.99 | per 3 months |
| Unlimited Use (1 Year) | $4.99 | per year |
| Lifetime Access | $12.99 | one-time |


### SiS4School

[App page](https://appshunter.io/ios/app/sis4school/id6779064401)

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

**In-app purchases:** none


## Frequently asked questions

### Is Check Answer free?

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

### Is SiS4School free?

SiS4School is free to download, with no in-app purchases.

### Do Check Answer or SiS4School have ads?

Neither Check Answer nor SiS4School shows ads.

### Which is updated more often, Check Answer or SiS4School?

Check Answer ships an update every 4 days, and SiS4School every 2 weeks. Most recently, Check Answer was updated on October 2, 2026 and SiS4School 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.*