# HRVSpark vs EndureIndex

The clearest difference is update cadence: HRVSpark at weekly against EndureIndex's monthly. HRVSpark also leads on iOS requirement (17.0 vs 26.0). 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 EndureIndex sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

HRVSpark ships an update weekly, EndureIndex monthly. The most recent releases landed on October 31, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | HRVSpark | EndureIndex |
| --- | --- | --- |
| 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** | Monthly |
| Monetization | Freemium | — |
| Size | 6 MB | 9 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Joel Farthing](https://appshunter.io/developer/1879704683) | [Danilo Krautz](https://appshunter.io/developer/1875731224) |

## 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 |


### EndureIndex

[App page](https://appshunter.io/ios/app/endureindex-training/id6760260948)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EndureIndex Pro Monthly | $1.99 | per month |
| EndureIndex Pro Yearly | $14.99 | per year |


## Frequently asked questions

### Is HRVSpark free?

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

### Is EndureIndex free?

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

### Do HRVSpark or EndureIndex have ads?

Neither HRVSpark nor EndureIndex shows ads.

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

HRVSpark ships an update weekly, and EndureIndex monthly. Most recently, HRVSpark was updated on October 31, 2026 and EndureIndex on November 7, 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.*