# GridMath vs InterestOS

The clearest difference is update cadence: GridMath at daily against InterestOS's weekly. GridMath also leads on iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. GridMath sells 3 one-off in-app purchases and InterestOS sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

GridMath ships an update daily, InterestOS weekly. The most recent releases landed on November 12, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | GridMath | InterestOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/interestos-k5-worksheets/id6790950368/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 13 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wojciech Szczurek](https://appshunter.io/developer/1454681479) | [JAKE ROBERT CRAYCRAFT](https://appshunter.io/developer/6790950370) |

## What reviewers say

### GridMath

[App page](https://appshunter.io/ios/app/gridmath/id6754144816)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 30 Tokens | $2.99 | one-time |
| 50 Tokens | $4.99 | one-time |
| 100 Tokens | $5.99 | one-time |


### InterestOS

[App page](https://appshunter.io/ios/app/interestos-k5-worksheets/id6790950368)

Personalized, printable learning packs for K-5 students based on their interests. Generates stories, worksheets, and parent guides aligned with academic standards. Offers a free trial and subscription for monthly packs.

**Highlights:** Personalized learning packs, Printable stories and worksheets, Parent guides for easy teaching, Aligned with academic standards, Kid-friendly artwork, Progress tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| InterestOS Premium | $9.99 | per month |


## Frequently asked questions

### Is GridMath free?

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

### Is InterestOS free?

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

### Do GridMath or InterestOS have ads?

Neither GridMath nor InterestOS shows ads.

### Which is updated more often, GridMath or InterestOS?

GridMath ships an update daily, and InterestOS weekly. Most recently, GridMath was updated on November 12, 2026 and InterestOS on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*