# SEC Heat Transfer vs Math Keyboard

The clearest difference is in-app purchases: SEC Heat Transfer at none against Math Keyboard's 1. SEC Heat Transfer also leads on iOS requirement (15.0 vs 26.2). Math Keyboard's advantage is update cadence (every 3 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Math Keyboard sells 1 one-off in-app purchase. SEC Heat Transfer asks for nothing beyond the download.

SEC Heat Transfer ships an update every 3 months, Math Keyboard every 3 weeks. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | SEC Heat Transfer | Math Keyboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.4 (13 ratings)](https://appshunter.io/ios/app/math-keyboard-formula-input/id6757350527/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 44.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 2 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [S.E.C. Accessories Limited](https://appshunter.io/developer/1483746720) | [Yuta Nishimatsu](https://appshunter.io/developer/1480004995) |

## What reviewers say

### SEC Heat Transfer

[App page](https://appshunter.io/ios/app/sec-heat-transfer/id1483746721)

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

**In-app purchases:** none


### Math Keyboard

[App page](https://appshunter.io/ios/app/math-keyboard-formula-input/id6757350527)

This custom keyboard simplifies typing mathematical and physics symbols, including Greek letters and superscripts/subscripts. Seamlessly input formulas into any app without needing to copy and paste from external sources. Enhance your notes, reports, and messages with ease.

**Highlights:** Superscripts/subscripts for numbers, letters, and symbols, Greek letters support, Wide variety of math symbols, Familiar keyboard layout, Quick tab switching, Cursor control via long-press

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MathKeyboard Pro | $5.99 | one-time |


## Frequently asked questions

### Is SEC Heat Transfer free?

SEC Heat Transfer is free to download, with no in-app purchases.

### Is Math Keyboard free?

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

### Do SEC Heat Transfer or Math Keyboard have ads?

Neither SEC Heat Transfer nor Math Keyboard shows ads.

### Which is updated more often, SEC Heat Transfer or Math Keyboard?

SEC Heat Transfer ships an update every 3 months, and Math Keyboard every 3 weeks. Most recently, SEC Heat Transfer was updated on November 7, 2026 and Math Keyboard on November 5, 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.*