# Shift Fuel vs ShiftRhythm

The clearest difference is update cadence: ShiftRhythm at every 2 days against Shift Fuel's every 5 months. ShiftRhythm also leads on iOS requirement (17.0 vs 26.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Shift Fuel sells 2 in-app purchases, starting at $2.99 per month and ShiftRhythm sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Shift Fuel ships an update every 5 months, ShiftRhythm every 2 days. The most recent releases landed on November 5, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Shift Fuel | ShiftRhythm |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 16 MB | 17 MB |
| Requires iOS | 26.4 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Monarch Labs Collective](https://appshunter.io/developer/1891368463) | [Jaeyoun Kim](https://appshunter.io/developer/6772886377) |

## What reviewers say

### Shift Fuel

[App page](https://appshunter.io/ios/app/shift-fuel/id6772874868)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Shift Fuel Pro Monthly | $2.99 | per month |
| Shift Fuel Pro Yearly | $14.99 | per year |


### ShiftRhythm

[App page](https://appshunter.io/ios/app/shiftrhythm-shift-sleep/id6776639759)

This app helps night shift workers optimize their sleep and light exposure based on their unique work schedules. It provides personalized guidance for sleep, naps, and light interaction to align with your body's natural circadian rhythm.

**Highlights:** Personalized sleep and nap timing, Light exposure guidance, Circadian rhythm insights (DLMO, CBTmin), Sleep score and debt tracking, Customizable roster presets, Apple Watch app and widgets

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $14.99 | per year |
| Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Shift Fuel free?

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

### Is ShiftRhythm free?

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

### Do Shift Fuel or ShiftRhythm have ads?

Neither Shift Fuel nor ShiftRhythm shows ads.

### Which is updated more often, Shift Fuel or ShiftRhythm?

Shift Fuel ships an update every 5 months, and ShiftRhythm every 2 days. Most recently, Shift Fuel was updated on November 5, 2026 and ShiftRhythm on November 1, 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.*