# Calto vs TreeNote

The clearest difference is in-app purchases: Calto at none against TreeNote's 1. Calto also leads on iOS requirement (15.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. TreeNote sells 1 one-off in-app purchase. Calto asks for nothing beyond the download.

Calto ships an update every 9 days, TreeNote weekly. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Calto | TreeNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/treenote-nested-notes/id6772667012/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Freemium |
| Size | 30 MB | 7 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JONGWOO PARK](https://appshunter.io/developer/1873952653) | [Zhe Wu](https://appshunter.io/developer/1821356459) |

## What reviewers say

### Calto

[App page](https://appshunter.io/ios/app/calto-note-calculator/id6758614596)

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

**In-app purchases:** none


### TreeNote

[App page](https://appshunter.io/ios/app/treenote-nested-notes/id6772667012)

Organize complex ideas into clear, nested outlines. Create boards for various projects and break down thoughts into detailed subnotes. Supports rich formatting, Markdown, and local data storage with optional iCloud sync.

**Highlights:** Unlimited nesting for flexible trees, Drag-and-drop reordering, Rich note details (tags, colors, due dates, images), Markdown formatting and preview, Import/export JSON, Markdown, OPML, Local data storage with iCloud sync

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TreeNote Pro | $2.99 | one-time |


## Frequently asked questions

### Is Calto free?

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

### Is TreeNote free?

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

### Do Calto or TreeNote have ads?

Neither Calto nor TreeNote shows ads.

### Which is updated more often, Calto or TreeNote?

Calto ships an update every 9 days, and TreeNote weekly. Most recently, Calto was updated on October 12, 2026 and TreeNote on October 6, 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.*