# Onbo vs Knowledge Base

The clearest difference is in-app purchases: Knowledge Base at none against Onbo's 1. Knowledge Base also leads on ads (none vs shown). Onbo's advantage is update cadence (every 4 days vs weekly) and iOS requirement (16.4 vs 26.4). On price and device support there is nothing between them.

Both are free to download. Onbo sells 1 in-app purchase, starting at $34.99 per year. Knowledge Base asks for nothing beyond the download.

Onbo ships an update every 4 days, Knowledge Base weekly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Onbo | Knowledge Base |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Weekly |
| Size | 116 MB | 9 MB |
| Requires iOS | **16.4** | 26.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sieu Thai](https://appshunter.io/developer/1435851351) | [CHANG CHIA-WEI](https://appshunter.io/developer/1804812181) |

## What reviewers say

### Onbo

[App page](https://appshunter.io/ios/app/onbo-place-and-location-saver/id6768495248)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Pro | $34.99 | per year |


### Knowledge Base

[App page](https://appshunter.io/ios/app/knowledge-base-second-brain/id6785236967)

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

**In-app purchases:** none


## Frequently asked questions

### Is Onbo free?

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

### Is Knowledge Base free?

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

### Do Onbo or Knowledge Base have ads?

Onbo shows ads; Knowledge Base does not.

### Which is updated more often, Onbo or Knowledge Base?

Onbo ships an update every 4 days, and Knowledge Base weekly. Most recently, Onbo was updated on October 28, 2026 and Knowledge Base on October 31, 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.*