# Open Stress vs POTS Tracker

The clearest difference is iOS requirement: POTS Tracker at 15.0 against Open Stress's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Open Stress sells 1 in-app purchase, starting at $9.99 per year and POTS Tracker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Open Stress | POTS Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 6 MB | 50 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Sihang Chen](https://appshunter.io/developer/1479493730) | [Daniel Gartler](https://appshunter.io/developer/6789568198) |

## What reviewers say

### Open Stress

[App page](https://appshunter.io/ios/app/open-stress-hrv-notifier/id6792768616)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Open Stress Annual | $9.99 | per year |


### POTS Tracker

[App page](https://appshunter.io/ios/app/pots-tracker-dysautonomie/id6797274783)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| POTS Tracker: Dysautonomia | $17.99 | one-time |


## Frequently asked questions

### Is Open Stress free?

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

### Is POTS Tracker free?

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

### Do Open Stress or POTS Tracker have ads?

Neither Open Stress nor POTS Tracker shows ads.

### Which is updated more often, Open Stress or POTS Tracker?

Open Stress ships an update every 3 weeks, and POTS Tracker every 3 weeks. Most recently, Open Stress was updated on October 23, 2026 and POTS Tracker on October 25, 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.*