# Probability vs Sparrows HSEQ

The clearest difference is update cadence: Sparrows HSEQ at every 7 months against Probability's every 18 months. Probability's advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Probability ships an update every 18 months, Sparrows HSEQ every 7 months. The most recent releases landed on October 27, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Probability | Sparrows HSEQ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 7 months** |
| Size | 1 MB | 24 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [domesticusdevelop](https://appshunter.io/developer/373834594) | [Sparrows Offshore Services Limited](https://appshunter.io/developer/1560825394) |

## What reviewers say

### Probability

[App page](https://appshunter.io/ios/app/probability-dd/id1451460705)

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

**In-app purchases:** none


### Sparrows HSEQ

[App page](https://appshunter.io/ios/app/sparrows-hseq/id1497084498)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Probability free?

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

### Is Sparrows HSEQ free?

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

### Do Probability or Sparrows HSEQ have ads?

Neither Probability nor Sparrows HSEQ shows ads.

### Which is updated more often, Probability or Sparrows HSEQ?

Probability ships an update every 18 months, and Sparrows HSEQ every 7 months. Most recently, Probability was updated on October 27, 2026 and Sparrows HSEQ on October 8, 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.*