# Octuple Calc vs ConvertCalc

The clearest difference is in-app purchases: Octuple Calc at none against ConvertCalc's 1. Octuple Calc also leads on iOS requirement (15.8.3 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ConvertCalc sells 1 one-off in-app purchase. Octuple Calc asks for nothing beyond the download.

Octuple Calc ships an update every 2 weeks, ConvertCalc every 8 days. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Octuple Calc | ConvertCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/convertcalc/id6756512186/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 36 MB | 28 MB |
| Requires iOS | **15.8.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Michael Riehl](https://appshunter.io/developer/1861093934) |

## What reviewers say

### Octuple Calc

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

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

**In-app purchases:** none


### ConvertCalc

[App page](https://appshunter.io/ios/app/convertcalc/id6756512186)

This app combines a powerful calculator with an advanced unit converter, offering over 200 units across 19 categories. It allows for unified calculations and conversions in one step, with features like live currency exchange and date conversions. An optional pro version unlocks advanced customization and organizational tools.

**Highlights:** Unified calculation and conversion workflow, Over 200 units across 19 categories, Live currency conversion, Multiple calendar system conversions, Age calculator, Customizable themes and layouts, Offline functionality (excluding live currency)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ConvertCalc Pro | $8.99 | one-time |


## Frequently asked questions

### Is Octuple Calc free?

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

### Is ConvertCalc free?

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

### Do Octuple Calc or ConvertCalc have ads?

Both Octuple Calc and ConvertCalc show ads.

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

Octuple Calc ships an update every 2 weeks, and ConvertCalc every 8 days. Most recently, Octuple Calc was updated on November 8, 2026 and ConvertCalc on October 30, 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.*