# SupStack vs Protocol

The clearest difference is review sentiment: SupStack at 100% against Protocol's 0%. SupStack also leads on rating (5.0 vs 3.0) and ads (none vs shown). Protocol's advantage is iOS requirement (16.0 vs 18.4). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. SupStack sells 2 in-app purchases, starting at $2.99 per 7 days and Protocol sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

SupStack holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 100% of SupStack's written reviews are positive against 0% of Protocol's.

SupStack ships an update every 6 days, Protocol fortnightly. The most recent releases landed on September 20, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | SupStack | Protocol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/supstack-supplement-advisor/id6757682290/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/protocol-hrv-tracker/id6762954264/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Fortnightly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 9 MB | 58 MB |
| Requires iOS | 18.4 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [WSK Labs LLC](https://appshunter.io/developer/1811489211) | [AppEcho Labs ,LLC](https://appshunter.io/developer/1701185869) |

## What reviewers say

### SupStack

[App page](https://appshunter.io/ios/app/supstack-supplement-advisor/id6757682290)

This app helps you understand and manage your daily supplements. It offers AI-powered analysis of supplement interactions and timing, smart reminders for intake, and hydration tracking to build consistent wellness habits.

**Highlights:** AI stack analysis for interactions and timing, Smart reminders for supplement intake, Daily water intake tracking, Progress tracking and streak building, Simple and intuitive interface, Analysis of positive, negative, and neutral interactions

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SupStack Pro Weekly | $2.99 | per 7 days |
| SupStack Pro Monthly | $9.99 | per month |


### Protocol

[App page](https://appshunter.io/ios/app/protocol-hrv-tracker/id6762954264)

This app helps you scientifically test health claims about supplements, routines, and lifestyle changes. It guides you through 21-day experiments using your own body data and provides clear verdicts based on your metrics.

**Highlights:** Test health claims scientifically, Structured 21-day experiments, Integrates with Apple Health data, Provides clear 'Keep It' or 'Drop It' verdicts, Tests supplements, routines, and lifestyle changes, Data privacy and export options

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protocol Pro (Monthly) | $14.99 | per month |
| Protocol Pro (Annual) | $119.99 | per year |


## Frequently asked questions

### Is SupStack free?

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

### Is Protocol free?

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

### Which has better reviews, SupStack or Protocol?

SupStack is rated higher. SupStack averages 5.0 out of 5 from 1 ratings, while Protocol averages 3.0 from 2 ratings.

### Do SupStack or Protocol have ads?

Protocol shows ads; SupStack does not.

### Which is updated more often, SupStack or Protocol?

SupStack ships an update every 6 days, and Protocol fortnightly. Most recently, SupStack was updated on September 20, 2026 and Protocol on September 11, 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.*