# Hydrate App vs KLU Longevity

The clearest difference is update cadence: KLU Longevity at every 3 weeks against Hydrate App's every 16 months. KLU Longevity also leads on iOS requirement (16.6 vs 27.0). 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.

Hydrate App ships an update every 16 months, KLU Longevity every 3 weeks. The most recent releases landed on September 15, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | Hydrate App | KLU Longevity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrate-app/id6472684650/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 13 MB | 92 MB |
| Requires iOS | 27.0 | **16.6** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Digitizr LLC](https://appshunter.io/developer/1465518556) | [LifeUnlocked s.r.o.](https://appshunter.io/developer/1896421480) |

## What reviewers say

### Hydrate App

[App page](https://appshunter.io/ios/app/hydrate-app/id6472684650)

Effortlessly track your daily water intake and monitor progress towards personalized hydration goals. Log various beverages quickly and visualize your achievements with a clean, colorful ring. Gain insights into your hydration habits over time.

**Highlights:** Log any drink in seconds, Set personalized daily hydration goals, Visualize progress with a colorful ring, View daily, weekly, and long-term trends, Supports light and dark mode, Fast and simple user interface

**Features:** Apple Watch app

**In-app purchases:** none


### KLU Longevity

[App page](https://appshunter.io/ios/app/klu-longevity/id6760349826)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hydrate App free?

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

### Is KLU Longevity free?

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

### Do Hydrate App or KLU Longevity have ads?

Neither Hydrate App nor KLU Longevity shows ads.

### Which is updated more often, Hydrate App or KLU Longevity?

Hydrate App ships an update every 16 months, and KLU Longevity every 3 weeks. Most recently, Hydrate App was updated on September 15, 2026 and KLU Longevity on August 31, 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.*