# HRVSpark vs VitalStackFit

The clearest difference is update cadence: VitalStackFit at every 2 days against HRVSpark's weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. HRVSpark sells 2 one-off in-app purchases and VitalStackFit sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

HRVSpark ships an update weekly, VitalStackFit every 2 days. The most recent releases landed on October 14, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | HRVSpark | VitalStackFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hrvspark/id6759590346/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 6 MB | 13 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Joel Farthing](https://appshunter.io/developer/1879704683) | [TORQUETRAIL LLP](https://appshunter.io/developer/1874452612) |

## What reviewers say

### HRVSpark

[App page](https://appshunter.io/ios/app/hrvspark/id6759590346)

Visualize your raw heart rate variability data directly on your Apple Watch face with a dynamic sparkline complication. Get immediate insights into your body's trends without opaque scores or labels. A companion iPhone app provides detailed views and guidance.

**Highlights:** Raw HRV sparkline complication, 8-hour free complication, 24/7, 7-day, 30-day Pro views, Circular gauge and corner complications, iPhone companion app, No interpretation layer, Complication-first design

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HRVSpark Pro | $0.99 | one-time |
| HRVSpark Tip Jar | $4.99 | one-time |


### VitalStackFit

[App page](https://appshunter.io/ios/app/vitalstackfit/id6760126478)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VitalStackFit Pro Monthly | $4.99 | per month |
| VitalStackFit Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is HRVSpark free?

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

### Is VitalStackFit free?

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

### Do HRVSpark or VitalStackFit have ads?

Neither HRVSpark nor VitalStackFit shows ads.

### Which is updated more often, HRVSpark or VitalStackFit?

HRVSpark ships an update weekly, and VitalStackFit every 2 days. Most recently, HRVSpark was updated on October 14, 2026 and VitalStackFit on October 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.*