# FLOWBIO vs Vaken

The clearest difference is in-app purchases: FLOWBIO at none against Vaken's 1. Vaken's advantage is iOS requirement (17.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Vaken sells 1 one-off in-app purchase. FLOWBIO asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 5, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | FLOWBIO | Vaken |
| --- | --- | --- |
| 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 | Fortnightly |
| Monetization | Free | — |
| Size | 37 MB | 4 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [FLOWBIO LTD](https://appshunter.io/developer/1607898930) | [Dan Kristoffer Holmstad](https://appshunter.io/developer/1894215395) |

## 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


### Vaken

[App page](https://appshunter.io/ios/app/vaken/id6762458404)

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vaken Premium | $4.99 | one-time |


## Frequently asked questions

### Is FLOWBIO free?

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

### Is Vaken free?

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

### Do FLOWBIO or Vaken have ads?

Neither FLOWBIO nor Vaken shows ads.

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

FLOWBIO ships an update fortnightly, and Vaken fortnightly. Most recently, FLOWBIO was updated on October 5, 2026 and Vaken on October 3, 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.*