# HydrateTap vs Yinstill

The clearest difference is in-app purchases: Yinstill at none against HydrateTap's 3. Yinstill also leads on update cadence (every 3 weeks vs every 6 months) and iOS requirement (16.6 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. HydrateTap sells 3 in-app purchases, starting at $0.99 per 7 days. Yinstill asks for nothing beyond the download.

HydrateTap ships an update every 6 months, Yinstill every 3 weeks. The most recent releases landed on October 28, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | HydrateTap | Yinstill |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Size | 65 MB | 49 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Eldin Mujovic](https://appshunter.io/developer/1608171214) | [Yinstill](https://appshunter.io/developer/1896496036) |

## What reviewers say

### HydrateTap

[App page](https://appshunter.io/ios/app/hydratetap-water-tracker/id6749263836)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydrateTap Plus | $0.99 | per 7 days |
| Theme Pack | $1.99 | one-time |
| HydrateTap Pro | $4.99 | one-time |


### Yinstill

[App page](https://appshunter.io/ios/app/yinstill/id6767648073)

**In-app purchases:** none


## Frequently asked questions

### Is HydrateTap free?

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

### Is Yinstill free?

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

### Do HydrateTap or Yinstill have ads?

Neither HydrateTap nor Yinstill shows ads.

### Which is updated more often, HydrateTap or Yinstill?

HydrateTap ships an update every 6 months, and Yinstill every 3 weeks. Most recently, HydrateTap was updated on October 28, 2026 and Yinstill on September 24, 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.*