# ONSI ALS App vs Heavy Protocol

The clearest difference is update cadence: Heavy Protocol at every 8 days against ONSI ALS App's every 3 weeks. ONSI ALS App's advantage is iOS requirement (13.0 vs 17.6). 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.

ONSI ALS App ships an update every 3 weeks, Heavy Protocol every 8 days. Both last shipped on October 9, 2026.

## The numbers

| Metric | ONSI ALS App | Heavy Protocol |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Size | 22 MB | 9 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [University of Kentucky](https://appshunter.io/developer/328074751) | [Gopalarathnam Venkatesan](https://appshunter.io/developer/1859899384) |

## What reviewers say

### ONSI ALS App

[App page](https://appshunter.io/ios/app/onsi-als-app/id6470493744)

**Features:** macOS Compatibility

**In-app purchases:** none


### Heavy Protocol

[App page](https://appshunter.io/ios/app/heavy-protocol/id6756292434)

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

**In-app purchases:** none


## Frequently asked questions

### Is ONSI ALS App free?

ONSI ALS App is free to download, with no in-app purchases.

### Is Heavy Protocol free?

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

### Do ONSI ALS App or Heavy Protocol have ads?

Neither ONSI ALS App nor Heavy Protocol shows ads.

### Which is updated more often, ONSI ALS App or Heavy Protocol?

ONSI ALS App ships an update every 3 weeks, and Heavy Protocol every 8 days. Most recently, ONSI ALS App was updated on October 9, 2026 and Heavy Protocol on October 9, 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.*