PoopDiary vs Hydro Dots
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PoopDiary
Easily log your bowel movements, noting the date, stool shape, and volume. This health tracker helps you monitor your digestive health.
- Record bowel movement dates
- Log stool shape
- Track stool volume
- Digestive health monitoring
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This app is for keeping a record of bowel movements. You can easily record the date and the shape/volume of the stool.
Hydro Dots
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Hydro Dots is a water tracker that draws your day as a rising water level, one dot at a time. Tap once to log a cup, a mug, or a bottle. The water climbs. That is the whole idea. WHAT IT DOES • One tap to log — your usual sizes sit on the first screen. Custom amounts and drink types are one tap further. • Not every drink counts the same — coffee, tea, juice and the rest are converted by their hydration index, so what you log is what your body keeps. • A goal that follows your day — body weight, temperature, humidity, UV and activity shape the target. It settles once, the first time you open the app each day, so it never moves under you. • Reminders that know where you stand — each one carries how much you have had and the pace that would get you there. • History and recap — a week of bars, a month of dots, a streak counter, and the month's total turned into things you can picture: bottles, kettles, sugar you avoided. • Widgets — log from the home screen or the lock screen without opening the app. A month of dots fits on the large one. • Shortcuts and Siri — log a drink or ask what you have had today, hands free. Every action is available to build your own routines. • Apple Health — records can be written to Health, and removing a record takes it back out. PRO A one-time purchase. No subscription. • No ads • Every theme — seven palettes, from cream LCD to OLED black • iCloud sync — records and drinks across your devices PRIVACY What you drink stays on your device. Your records are not sent anywhere unless you turn on iCloud sync, and then they go to your own iCloud, not to us.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | PoopDiary | Hydro Dots |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 8 months | Daily — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 6 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuta Endo | Kengo Tate |
In-app purchases
PoopDiary
- Hide ads$5.99
Hydro Dots
- A drop$0.99
- A glass$2.99
- A bottle$5.99
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- Pro — Founding Member$5.99
Questions
Is PoopDiary free?
Is Hydro Dots free?
Do PoopDiary or Hydro Dots have ads?
Which is updated more often, PoopDiary or Hydro Dots?
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