# 1000digit Calc vs Thoughtree

The clearest difference is in-app purchases: 1000digit Calc at none against Thoughtree's 2. Thoughtree's advantage is update cadence (every 3 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Thoughtree sells 2 in-app purchases, starting at $19.99 per year. 1000digit Calc asks for nothing beyond the download.

1000digit Calc ships an update weekly, Thoughtree every 3 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1000digit Calc | Thoughtree |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/1000digit-calc/id6463856899/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free | — |
| Size | 5 MB | 66 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Yukihiro Shioya](https://appshunter.io/developer/1565306192) | [NIJIZO](https://appshunter.io/developer/1765848169) |

## What reviewers say

### 1000digit Calc

[App page](https://appshunter.io/ios/app/1000digit-calc/id6463856899)

Perform arithmetic operations on integers up to 1,000 digits. Supports parentheses for complex calculations and automatically saves results to the clipboard for easy reuse in other applications.

**Highlights:** 1,000-digit integer calculations, Parentheses support for formula order, Automatic clipboard saving of results, Four basic arithmetic operations, Cross-application result reuse

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 1000digit Calc free?

1000digit Calc is free to download, with no in-app purchases.

### Is Thoughtree free?

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

### Do 1000digit Calc or Thoughtree have ads?

Neither 1000digit Calc nor Thoughtree shows ads.

### Which is updated more often, 1000digit Calc or Thoughtree?

1000digit Calc ships an update weekly, and Thoughtree every 3 days. Most recently, 1000digit Calc was updated on October 30, 2026 and Thoughtree on October 25, 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.*