# ShiftRhythm vs Plumb

The clearest difference is update cadence: ShiftRhythm at every 2 days against Plumb's every 10 days. ShiftRhythm also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. ShiftRhythm sells 3 in-app purchases, starting at $2.99 per month and Plumb sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ShiftRhythm ships an update every 2 days, Plumb every 10 days. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | ShiftRhythm | Plumb |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 7 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jaeyoun Kim](https://appshunter.io/developer/6772886377) | [MOHAMMAD ALJARAD](https://appshunter.io/developer/6784008263) |

## What reviewers say

### 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 |


### Plumb

[App page](https://appshunter.io/ios/app/plumb-posture-reminder/id6785198606)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plumb+ Weekly | $3.99 | per 7 days |
| Plumb+ Annual | $39.99 | per year |
| Plumb+ Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is ShiftRhythm free?

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

### Is Plumb free?

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

### Do ShiftRhythm or Plumb have ads?

Neither ShiftRhythm nor Plumb shows ads.

### Which is updated more often, ShiftRhythm or Plumb?

ShiftRhythm ships an update every 2 days, and Plumb every 10 days. Most recently, ShiftRhythm was updated on November 1, 2026 and Plumb 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.*