# Calclin vs Thoughtree

The clearest difference is update cadence: Thoughtree at every 2 days against Calclin's every 2 months. Thoughtree also leads on iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Calclin sells 2 one-off in-app purchases and Thoughtree sells 2 in-app purchases, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

Calclin ships an update every 2 months, Thoughtree every 2 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Calclin | Thoughtree |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 9 MB | 65 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Azukid.com](https://appshunter.io/developer/354937951) | [NIJIZO](https://appshunter.io/developer/1765848169) |

## 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 |


### Thoughtree

[App page](https://appshunter.io/ios/app/thoughtree-mind-map-and-outline/id6804508753)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Yearly | $19.99 | per year |
| Thoughtree Pro (Lifetime) | $29.99 | one-time |


## Frequently asked questions

### Is Calclin free?

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

### Is Thoughtree free?

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

### Do Calclin or Thoughtree have ads?

Neither Calclin nor Thoughtree shows ads.

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

Calclin ships an update every 2 months, and Thoughtree every 2 days. Most recently, Calclin was updated on October 15, 2026 and Thoughtree on October 8, 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.*