# PoopDiary vs Hydro Dots

The clearest difference is update cadence: Hydro Dots at daily against PoopDiary's every 8 months. PoopDiary's advantage is iOS requirement (17.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PoopDiary sells 1 one-off in-app purchase and Hydro Dots sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

PoopDiary ships an update every 8 months, Hydro Dots daily. The most recent releases landed on September 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | PoopDiary | Hydro Dots |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/poopdiary/id1541589953/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 8 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 43 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Yuta Endo](https://appshunter.io/developer/1256506814) | [Kengo Tate](https://appshunter.io/developer/1458012620) |

## What reviewers say

### PoopDiary

[App page](https://appshunter.io/ios/app/poopdiary/id1541589953)

Easily log your bowel movements, noting the date, stool shape, and volume. This health tracker helps you monitor your digestive health.

**Highlights:** Record bowel movement dates, Log stool shape, Track stool volume, Digestive health monitoring

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads | $5.99 | one-time |


### Hydro Dots

[App page](https://appshunter.io/ios/app/hydro-dots/id6794577673)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A drop | $0.99 | one-time |
| A glass | $2.99 | one-time |
| A bottle | $5.99 | one-time |
| Pro — Founding Member | $5.99 | one-time |


## Frequently asked questions

### Is PoopDiary free?

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

### Is Hydro Dots free?

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

### Do PoopDiary or Hydro Dots have ads?

Both PoopDiary and Hydro Dots show ads.

### Which is updated more often, PoopDiary or Hydro Dots?

PoopDiary ships an update every 8 months, and Hydro Dots daily. Most recently, PoopDiary was updated on September 27, 2026 and Hydro Dots 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.*