# Sumi vs Lachlan

The clearest difference is review sentiment: Lachlan at 100% against Sumi's 0%. Lachlan also leads on rating (5.0 vs 3.0) and ratings volume (8 vs 2). Sumi's advantage is monetization model (free vs subscription) and iOS requirement (16.0 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Sumi sells 3 in-app purchases, starting at $5.99 per month and Lachlan sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Lachlan holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 0% of Sumi's written reviews are positive against 100% of Lachlan's.

Sumi ships an update every 5 days, Lachlan weekly. The most recent releases landed on November 3, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Sumi | Lachlan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/sumi-deep-work-focus/id6448810281/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/lachlan-screen-time-control/id6792966928/reviews)** |
| Number of ratings | 2 | **8** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | **Free** | Subscription |
| Size | 10 MB | 34 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 9+ |
| Developer | [David Park](https://appshunter.io/developer/1686485618) | [ND Enterprises](https://appshunter.io/developer/6792966930) |

## What reviewers say

### 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 |


### Lachlan

[App page](https://appshunter.io/ios/app/lachlan-screen-time-control/id6792966928)

This app acts as a digital padlock, blocking distracting applications on a set schedule. It requires users to provide a reason before granting temporary access, encouraging mindful usage and accountability.

**Highlights:** Scheduled app blocking, Reason-based access grants, Personalized accountability, Screen time history trends, Streak system for engagement, Offline functionality

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $3.99 | per 7 days |
| Lachlan Monthly Subscription | $7.99 | per month |
| Lachlan Yearly Subscription | $69.99 | per year |


## Frequently asked questions

### Is Sumi free?

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

### Is Lachlan free?

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

### Which has better reviews, Sumi or Lachlan?

Lachlan is rated higher. Sumi averages 3.0 out of 5 from 2 ratings, while Lachlan averages 5.0 from 8 ratings.

### Do Sumi or Lachlan have ads?

Neither Sumi nor Lachlan shows ads.

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

Sumi ships an update every 5 days, and Lachlan weekly. Most recently, Sumi was updated on November 3, 2026 and Lachlan on November 10, 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.*