Hydro Dots vs Caffeine Clock
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
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 β’ One tap to log β your usual sizes sit on the first screen. Custom amounts and drink types are one tap further. β’ Not every drink counts the same β coffee, tea, juice and the rest are converted by their hydration index, so what you log is what your body keeps. β’ A goal that follows your day β 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. β’ Reminders that know where you stand β each one carries how much you have had and the pace that would get you there. β’ History and recap β 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. β’ Widgets β log from the home screen or the lock screen without opening the app. A month of dots fits on the large one. β’ Shortcuts and Siri β log a drink or ask what you have had today, hands free. Every action is available to build your own routines. β’ Apple Health β records can be written to Health, and removing a record takes it back out. PRO A one-time purchase. No subscription. β’ No ads β’ Every theme β seven palettes, from cream LCD to OLED black β’ iCloud sync β 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.
Caffeine Clock
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Not how much you drank - how much is still in you now, and how much will still be there at bedtime. One tap to log Set up to four usual drinks and log them the moment you tap. Mistaps are undoable, and you can move a record to "1 hour ago" afterwards. The hours you could not see The ring at the centre - the Caffeine Halo - shows what is estimated to remain. It also shows the estimate at your bedtime and when it will be mostly gone. Connect Health (Pro) Compare the estimate at bedtime with your time asleep, night wakings, and next-morning HRV, using your records only. The analysis stays on this device and is never sent anywhere. Widgets and Apple Watch Check from the Lock Screen, Home Screen, or your watch face - and log right there. Apple Watch logs offline and syncs later without duplicates. Two themes Calm roast and crema tones, or a dark base with electric accents. Switch any time in Settings. Never blames you Days without records are not failures. No streak pressure, and notifications carry neutral wording only. No account No sign-in. Your records stay on your device. Caffeine Clock Pro (one-time purchase) unlocks sleep relations, every widget, Apple Watch, custom presets, and CSV export. Logging, estimates, the calendar, and today's and weekly stats stay free. Note: caffeine amounts shown are estimates, not measurements. Do not use them for medical, medication, or driving decisions.
Screenshots
Verdict
The clearest difference is ads: Caffeine Clock at none against Hydro Dots's shown. Caffeine Clock also leads on iOS requirement (18.0 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Hydro Dots sells 4 one-off in-app purchases and Caffeine Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Hydro Dots ships an update daily, Caffeine Clock every 2 days. Both last shipped on November 13, 2026.
| Parameter | Hydro Dots | Caffeine Clock |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily β better | Every 2 days |
| Ads | Yes | No β better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 26.0 | 18.0 β better |
| Further details β not scored | ||
| Size | 43 MB | 6 MB |
| Age rating | 4+ | 12+ |
| Developer | Kengo Tate | kazunari aoki |
In-app purchases
Hydro Dots
- A drop$0.99
- A glass$2.99
- A bottle$5.99
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- Pro β Founding Member$5.99
Caffeine Clock
- Caffeine Clock Pro$9.99
Questions
Is Hydro Dots free?
Is Caffeine Clock free?
Do Hydro Dots or Caffeine Clock have ads?
Which is updated more often, Hydro Dots or Caffeine Clock?
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