# HappyKey vs Math Solver AI

The clearest difference is in-app purchases: HappyKey at none against Math Solver AI's 2. Math Solver AI's advantage is update cadence (weekly vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Math Solver AI sells 2 in-app purchases, starting at $4.99 per 7 days. HappyKey asks for nothing beyond the download.

HappyKey ships an update every 8 months, Math Solver AI weekly. The most recent releases landed on September 24, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | HappyKey | Math Solver AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (9 ratings)](https://appshunter.io/ios/app/happykey/id965705471/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | Free | — |
| Size | 26 MB | 24 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Baratti](https://appshunter.io/developer/1264988386) | [Ilayda Kizil](https://appshunter.io/developer/1819099692) |

## What reviewers say

### HappyKey

[App page](https://appshunter.io/ios/app/happykey/id965705471)

This app offers a specialized keyboard for easily inputting a wide range of mathematical symbols. It includes numbers, operators, pi, infinity, and more, simplifying the process of writing math notation on your device.

**Highlights:** Specialized math symbol keyboard, Includes numbers and operators, Supports pi and infinity symbols, Simplifies math notation input, Customizable keyboard layout

**In-app purchases:** none


### Math Solver AI

[App page](https://appshunter.io/ios/app/math-solver-ai-mathy/id6746950449)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Annual | $49.99 | per year |


## Frequently asked questions

### Is HappyKey free?

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

### Is Math Solver AI free?

Math Solver AI is free to download, with in-app purchases available.

### Do HappyKey or Math Solver AI have ads?

Neither HappyKey nor Math Solver AI shows ads.

### Which is updated more often, HappyKey or Math Solver AI?

HappyKey ships an update every 8 months, and Math Solver AI weekly. Most recently, HappyKey was updated on September 24, 2026 and Math Solver AI on September 11, 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.*