# Atomic KB vs Kioku

The clearest difference is update cadence: Kioku at every 2 days against Atomic KB's every 2 months. Atomic KB's advantage is iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Atomic KB ships an update every 2 months, Kioku every 2 days. The most recent releases landed on October 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Atomic KB | Kioku |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 6 MB | 51 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Foldspace Labs LLC](https://appshunter.io/developer/1796614941) | [Kai Kang](https://appshunter.io/developer/1757164832) |

## What reviewers say

### Atomic KB

[App page](https://appshunter.io/ios/app/atomic-kb/id6759266634)

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

**In-app purchases:** none


### Kioku

[App page](https://appshunter.io/ios/app/kioku-private-second-brain/id6762234661)

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

**In-app purchases:** none


## Frequently asked questions

### Is Atomic KB free?

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

### Is Kioku free?

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

### Do Atomic KB or Kioku have ads?

Neither Atomic KB nor Kioku shows ads.

### Which is updated more often, Atomic KB or Kioku?

Atomic KB ships an update every 2 months, and Kioku every 2 days. Most recently, Atomic KB was updated on October 5, 2026 and Kioku on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*