# Promil Meter vs SleepShift

The clearest difference is review sentiment: SleepShift at 100% against Promil Meter's 50%. Promil Meter's advantage is in-app purchases (none vs 2) and update cadence (weekly vs every 3 months). On price and ads there is nothing between them.

Both are free to download. SleepShift sells 2 in-app purchases, starting at $5.99 per month. Promil Meter asks for nothing beyond the download.

Promil Meter ships an update weekly, SleepShift every 3 months. The most recent releases landed on September 30, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Promil Meter | SleepShift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sleepshift/id6760953945/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 7 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Ali Can Olgen](https://appshunter.io/developer/1821864789) | [YUECEL CELIK](https://appshunter.io/developer/1886932004) |

## What reviewers say

### Promil Meter

[App page](https://appshunter.io/ios/app/promil-meter/id6747582404)

Calculate your blood alcohol content (BAC) in real-time using a scientific formula. Track your alcohol consumption, get estimated sober-up times, and receive driving warnings for responsible drinking.

**Highlights:** Real-time BAC calculation, Estimated time to sober up, Driving warnings, Multi-profile support, Custom alcohol types, Consumption history and statistics, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### SleepShift

[App page](https://appshunter.io/ios/app/sleepshift/id6760953945)

This app helps shift workers optimize their sleep by calculating personalized sleep windows based on their unique schedules. It offers guidance on light exposure, caffeine, and naps, with features like lock screen widgets and Apple Health integration.

**Highlights:** Personalized optimal sleep windows, Home and lock screen widgets, Live Activity for Dynamic Island, Light exposure guidance, Caffeine and melatonin timing, Pre-shift nap recommendations, Apple Health integration

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SleepShift Pro | $5.99 | per month |
| Pro Annual | $34.99 | per year |


## Frequently asked questions

### Is Promil Meter free?

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

### Is SleepShift free?

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

### Do Promil Meter or SleepShift have ads?

Neither Promil Meter nor SleepShift shows ads.

### Which is updated more often, Promil Meter or SleepShift?

Promil Meter ships an update weekly, and SleepShift every 3 months. Most recently, Promil Meter was updated on September 30, 2026 and SleepShift on September 25, 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.*