# ThemeCalc vs Octuple Calc

The clearest difference is in-app purchases: Octuple Calc at none against ThemeCalc's 17. Octuple Calc also leads on iOS requirement (15.8.3 vs 18.0). ThemeCalc's advantage is update cadence (every 6 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. ThemeCalc sells 17 in-app purchases, starting at $0.99 per month. Octuple Calc asks for nothing beyond the download.

ThemeCalc ships an update every 6 days, Octuple Calc every 2 weeks. The most recent releases landed on October 18, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ThemeCalc | Octuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 36 MB |
| Requires iOS | 18.0 | **15.8.3** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Toan Le](https://appshunter.io/developer/1462706953) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### ThemeCalc

[App page](https://appshunter.io/ios/app/themecalc-math-and-calculator/id6605930538)

Enhance your math experience with a powerful scientific calculator featuring over 40 aesthetic themes. It offers a professional engine for various math levels, a programmer mode, and a history tape for easy recall. Customize your calculator's look and feel while tackling complex problems.

**Highlights:** Professional scientific calculator engine, 40+ aesthetic themes, Programmer mode (HEX, DEC, OCT, BIN), History tape for past calculations, Haptic feedback, Customizable layouts

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

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $5.99 | per year |
| Solar Flare | $1.99 | one-time |
| Valhalla Viking | $1.99 | one-time |
| Sakura Zen Garden | $1.99 | one-time |
| Atlantis Deep | $1.99 | one-time |
| Quantum Processor | $1.99 | one-time |
| Casio fx-991ES Theme | $1.99 | one-time |
| Casio fx-115ES Theme | $1.99 | one-time |
| Casio fx-570VN Theme | $1.99 | one-time |
| Casio fx-350MS Theme | $1.99 | one-time |
| Casio fx-580VN X Theme | $1.99 | one-time |
| Casio fx-CG50 Theme | $1.99 | one-time |
| Casio fx-92 Collège Theme | $1.99 | one-time |
| Casio fx-5800P Theme | $1.99 | one-time |
| Casio fx-9860GII Theme | $1.99 | one-time |
| Unlock Everything | $9.99 | one-time |


### Octuple Calc

[App page](https://appshunter.io/ios/app/octuple-calc/id6742039735)

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

**In-app purchases:** none


## Frequently asked questions

### Is ThemeCalc free?

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

### Is Octuple Calc free?

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

### Do ThemeCalc or Octuple Calc have ads?

Both ThemeCalc and Octuple Calc show ads.

### Which is updated more often, ThemeCalc or Octuple Calc?

ThemeCalc ships an update every 6 days, and Octuple Calc every 2 weeks. Most recently, ThemeCalc was updated on October 18, 2026 and Octuple Calc on October 13, 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.*