# RHRSpark vs Moss

The clearest difference is in-app purchases: Moss at none against RHRSpark's 2. RHRSpark's advantage is update cadence (weekly vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RHRSpark sells 2 one-off in-app purchases. Moss asks for nothing beyond the download.

RHRSpark ships an update weekly, Moss monthly. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | RHRSpark | Moss |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rhrspark/id6762872980/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 18 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Joel Farthing](https://appshunter.io/developer/1879704683) | [Quiet Leaf LLC](https://appshunter.io/developer/6777428492) |

## What reviewers say

### RHRSpark

[App page](https://appshunter.io/ios/app/rhrspark/id6762872980)

Visualize your resting heart rate directly on your Apple Watch face with customizable complications. Choose from various styles and time windows to see your heart rate trends at a glance. Understand how your data is calculated with full transparency.

**Highlights:** Resting heart rate on watch face, Sparkline, gauge, or corner complications, 10 watch face complications, 4 time window options (8H, 24H, 7D, 30D), Two distinct data sources, Full calculation transparency

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RHRSpark Pro | $0.99 | one-time |
| Tip Jar | $2.99 | one-time |


### Moss

[App page](https://appshunter.io/ios/app/moss-meditation-timer/id6777428490)

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

**In-app purchases:** none


## Frequently asked questions

### Is RHRSpark free?

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

### Is Moss free?

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

### Do RHRSpark or Moss have ads?

Neither RHRSpark nor Moss shows ads.

### Which is updated more often, RHRSpark or Moss?

RHRSpark ships an update weekly, and Moss monthly. Most recently, RHRSpark was updated on October 24, 2026 and Moss on October 6, 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.*