# Klus vs Sumi

The clearest difference is in-app purchases: Klus at none against Sumi's 3. Sumi's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sumi sells 3 in-app purchases, starting at $5.99 per month. Klus asks for nothing beyond the download.

Klus ships an update every 3 weeks, Sumi every 5 days. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Klus | Sumi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/sumi-deep-work-focus/id6448810281/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | — | Free |
| Size | 27 MB | 10 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Klus App BV](https://appshunter.io/developer/1689904815) | [David Park](https://appshunter.io/developer/1686485618) |

## What reviewers say

### Klus

[App page](https://appshunter.io/ios/app/klus/id1576538931)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sumi

[App page](https://appshunter.io/ios/app/sumi-deep-work-focus/id6448810281)

This app helps you reduce phone usage by setting timers for breaks. It alerts you if you touch or move your device during the break, aiming to boost productivity and mental well-being.

**Highlights:** Timed phone breaks, Movement alerts, Productivity enhancement, Mental health improvement, Simple interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sumi Pro Monthly | $5.99 | per month |
| Sumi Pro Annual | $24.99 | per year |
| Sumi Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Klus free?

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

### Is Sumi free?

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

### Do Klus or Sumi have ads?

Neither Klus nor Sumi shows ads.

### Which is updated more often, Klus or Sumi?

Klus ships an update every 3 weeks, and Sumi every 5 days. Most recently, Klus was updated on October 11, 2026 and Sumi on October 7, 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.*