# Achieva vs KnowTree

The clearest difference is in-app purchases: Achieva at none against KnowTree's 1. KnowTree's advantage is iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

Achieva ships an update every 2 weeks, KnowTree every 9 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Achieva | KnowTree |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/knowtree/id6757321205/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 61 MB | 51 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shuto Motoike](https://appshunter.io/developer/1835852111) | [Ukon Ryohei](https://appshunter.io/developer/1834526187) |

## What reviewers say

### Achieva

[App page](https://appshunter.io/ios/app/achieva/id6751570762)

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

**In-app purchases:** none


### KnowTree

[App page](https://appshunter.io/ios/app/knowtree/id6757321205)

Organize your thoughts and information hierarchically with parent-child relationships. Supports Markdown, images, and code blocks for rich note-taking. Offers flexible workflows and powerful search capabilities.

**Highlights:** Hierarchical note organization, Markdown support, Flexible workflow (top-down/bottom-up), Rich content (images, links, code), Search across all nodes, Backup and restore functionality, Multiple tree management (premium)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KnowTree Premium | $4.99 | one-time |


## Frequently asked questions

### Is Achieva free?

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

### Is KnowTree free?

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

### Do Achieva or KnowTree have ads?

Both Achieva and KnowTree show ads.

### Which is updated more often, Achieva or KnowTree?

Achieva ships an update every 2 weeks, and KnowTree every 9 days. Most recently, Achieva was updated on October 25, 2026 and KnowTree on October 28, 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.*