# FLOWBIO vs PROTR

The clearest difference is in-app purchases: FLOWBIO at none against PROTR's 10. FLOWBIO also leads on update cadence (fortnightly vs every 5 weeks). PROTR's advantage is iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. PROTR sells 10 in-app purchases, starting at $149.99 per month. FLOWBIO asks for nothing beyond the download.

FLOWBIO ships an update fortnightly, PROTR every 5 weeks. Both last shipped on October 5, 2026.

## The numbers

| Metric | FLOWBIO | PROTR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/flowbio/id1614407048/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free | — |
| Size | 37 MB | 79 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 17+ | 12+ |
| Developer | [FLOWBIO LTD](https://appshunter.io/developer/1607898930) | [Out Of Home Limited](https://appshunter.io/developer/1882309152) |

## What reviewers say

### FLOWBIO

[App page](https://appshunter.io/ios/app/flowbio/id1614407048)

This app analyzes sweat data to provide personalized hydration and recovery strategies for athletes. It connects to a sweat sensor to track fluid and sodium loss, offering tailored plans and pre-session predictions to optimize performance.

**Highlights:** Personalized hydration strategies, Tailored recovery plans, Pre-session performance predictions, Intake logging, Support for electrolyte brands, Integrations with Garmin, Wahoo, Zwift, Coros

**Features:** macOS Compatibility

**In-app purchases:** none


### PROTR

[App page](https://appshunter.io/ios/app/protr-workout-and-training-log/id6760012262)

**Features:** Apple Watch app

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PROTR Coaching | $149.99 | per month |
| PROTR Coaching | $159.99 | per month |
| PROTR Coaching | $164.99 | per month |
| PROTR Coaching | $169.99 | per month |
| PROTR Coaching | $174.99 | per month |
| PROTR Coaching | $179.99 | per month |
| PROTR Coaching | $184.99 | per month |
| PROTR Coaching | $189.99 | per month |
| PROTR Coaching | $194.99 | per month |
| PROTR Coaching | $199.99 | per month |


## Frequently asked questions

### Is FLOWBIO free?

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

### Is PROTR free?

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

### Do FLOWBIO or PROTR have ads?

Neither FLOWBIO nor PROTR shows ads.

### Which is updated more often, FLOWBIO or PROTR?

FLOWBIO ships an update fortnightly, and PROTR every 5 weeks. Most recently, FLOWBIO was updated on October 5, 2026 and PROTR on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*