# Kaizen vs Lock In Together

The clearest difference is in-app purchases: Lock In Together at none against Kaizen's 2. Lock In Together also leads on update cadence (every 5 days vs fortnightly) and iOS requirement (13.0 vs 16.4). Kaizen's advantage is device support. On price there is nothing between them.

Both are free to download. Kaizen sells 2 in-app purchases, starting at $3.99 per month. Lock In Together asks for nothing beyond the download.

Kaizen ships an update fortnightly, Lock In Together every 5 days. The most recent releases landed on September 12, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Kaizen | Lock In Together |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 66 MB | 34 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [MK Development](https://appshunter.io/developer/1853083060) | [Solbeen So](https://appshunter.io/developer/1885738452) |

## What reviewers say

### Kaizen

[App page](https://appshunter.io/ios/app/kaizen-focus-and-study-timer/id6755314708)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (monthly) | $3.99 | per month |
| Premium (yearly) | $44.99 | per year |


### Lock In Together

[App page](https://appshunter.io/ios/app/lock-in-together/id6760687057)

**In-app purchases:** none


## Frequently asked questions

### Is Kaizen free?

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

### Is Lock In Together free?

Lock In Together is free to download, with no in-app purchases.

### Which is updated more often, Kaizen or Lock In Together?

Kaizen ships an update fortnightly, and Lock In Together every 5 days. Most recently, Kaizen was updated on September 12, 2026 and Lock In Together on September 19, 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.*