# Calclin vs Dual

The clearest difference is in-app purchases: Dual at none against Calclin's 2. Calclin's advantage is update cadence (every 2 months vs every 28 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Calclin sells 2 one-off in-app purchases. Dual asks for nothing beyond the download.

Calclin ships an update every 2 months, Dual every 28 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Calclin | Dual |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/calclin/id385216637/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 28 months |
| Monetization | Free | — |
| Size | 9 MB | 4 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Azukid.com](https://appshunter.io/developer/354937951) | [Chih-Hao Chen](https://appshunter.io/developer/618207820) |

## What reviewers say

### Calclin

[App page](https://appshunter.io/ios/app/calclin/id385216637)

This calculator app provides a paper-roll style history for easy review of calculations. It supports formula input, notes for results, and multiple calculation frames to organize different tasks. Users can customize display modes and appearance.

**Highlights:** Paper-roll style calculation history, Multiple calculation frames, Formula input with parentheses and functions, Notes for calculation results, PDF export, Customizable digit grouping, separators, and rounding, Auto, Light, and Dark appearance modes

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tips_1 | $0.99 | one-time |
| Tips_5 | $4.99 | one-time |


### Dual

[App page](https://appshunter.io/ios/app/dual-calculator/id6479655030)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calclin free?

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

### Is Dual free?

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

### Do Calclin or Dual have ads?

Neither Calclin nor Dual shows ads.

### Which is updated more often, Calclin or Dual?

Calclin ships an update every 2 months, and Dual every 28 months. Most recently, Calclin was updated on November 1, 2026 and Dual on November 4, 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.*