# ovolution vs Hydration Buddy

The clearest difference is update cadence: ovolution at every 3 weeks against Hydration Buddy's every 2 months. ovolution also leads on device support (3 vs 1) and iOS requirement (15.6 vs 26.5). On price, ads and in-app purchases there is nothing between them.

Both are free to download. ovolution sells 3 in-app purchases, starting at $1.99 per month and Hydration Buddy sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ovolution ships an update every 3 weeks, Hydration Buddy every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ovolution | Hydration Buddy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/ovolution/id1633014678/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 121 MB | 5 MB |
| Requires iOS | **15.6** | 26.5 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ovolution GmbH](https://appshunter.io/developer/1633014680) | [Alexander Nielsen](https://appshunter.io/developer/6786638605) |

## What reviewers say

### ovolution

[App page](https://appshunter.io/ios/app/ovolution/id1633014678)

This app helps users understand their natural menstrual cycle using the NFP method. It tracks body signs like temperature and cervical mucus to determine ovulation and fertile days. Features include cycle phase information, fertility tracking, and pregnancy monitoring.

**Highlights:** NFP rule evaluation, Digital NFP cycle sheet, Body sign documentation, Cycle phase display and forecast, Fertility and pregnancy mode, Cycle statistics and overview, NFP educational articles and videos

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Monthly Subscription | $1.99 | per month |
| Yearly subscription | $19.99 | per year |


### Hydration Buddy

[App page](https://appshunter.io/ios/app/hydration-buddy-water-tracker/id6789956967)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $1.99 | per month |
| Plus Yearly | $14.99 | per year |


## Frequently asked questions

### Is ovolution free?

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

### Is Hydration Buddy free?

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

### Do ovolution or Hydration Buddy have ads?

Neither ovolution nor Hydration Buddy shows ads.

### Which is updated more often, ovolution or Hydration Buddy?

ovolution ships an update every 3 weeks, and Hydration Buddy every 2 months. Most recently, ovolution was updated on November 3, 2026 and Hydration Buddy on October 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.*