# Gerolsteiner TrinkCheck vs TK

The clearest difference is review sentiment: Gerolsteiner TrinkCheck at 85% against TK's 52%. Gerolsteiner TrinkCheck also leads on rating (4.5 vs 4.2). TK's advantage is iOS requirement (16.0 vs 18.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Gerolsteiner TrinkCheck holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 13 and 6 respectively. Written reviews point the same way: 85% of Gerolsteiner TrinkCheck's written reviews are positive against 52% of TK's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Gerolsteiner TrinkCheck | TK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (13 ratings)](https://appshunter.io/ios/app/gerolsteiner-trinkcheck/id370892661/reviews)** | [4.2 (6 ratings)](https://appshunter.io/ios/app/tk-coach/id6444313653/reviews) |
| Number of ratings | **13** | 6 |
| Positive reviews | **84.9% of reviews** | 51.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 78 MB | 68 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Gerolsteiner Brunnen GmbH & Co. KG](https://appshunter.io/developer/370892664) | [Techniker Krankenkasse (TK)](https://appshunter.io/developer/355493231) |

## What reviewers say

### Gerolsteiner TrinkCheck

[App page](https://appshunter.io/ios/app/gerolsteiner-trinkcheck/id370892661)

This app helps you determine your daily fluid needs based on personal data and weather. It allows you to track your drinks, set reminders, and participate in fun challenges to stay hydrated. Integration with health platforms is also supported.

**Highlights:** Personalized fluid intake calculation, Drink tracking and logging, Hydration reminders, Health platform integration (Apple Health), Apple Watch support, Customizable drink options, Hydration challenges

**In-app purchases:** none


### TK

[App page](https://appshunter.io/ios/app/tk-coach/id6444313653)

Achieve all-round wellbeing with personalized plans for fitness, nutrition, and relaxation. Set goals, track progress with self-tests, and receive motivating tips and recipe suggestions. Integrates with smartwatches for a holistic health overview.

**Highlights:** Personalized coaching plans, Fitness exercises and audio coaching, Extensive recipe database, Meditation and mindfulness exercises, Smartwatch and fitness tracker integration, Progress tracking and self-tests

**In-app purchases:** none


## Frequently asked questions

### Is Gerolsteiner TrinkCheck free?

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

### Is TK free?

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

### Which has better reviews, Gerolsteiner TrinkCheck or TK?

Gerolsteiner TrinkCheck is rated higher. Gerolsteiner TrinkCheck averages 4.5 out of 5 from 13 ratings, while TK averages 4.2 from 6 ratings.

### Do Gerolsteiner TrinkCheck or TK have ads?

Neither Gerolsteiner TrinkCheck nor TK shows ads.

### Which is updated more often, Gerolsteiner TrinkCheck or TK?

Gerolsteiner TrinkCheck ships an update every 2 months, and TK every 2 months. Most recently, Gerolsteiner TrinkCheck was updated on October 6, 2026 and TK on October 30, 2026.

---

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