Waterllama
Replaceable in one session with an AI coding agent.
A water-intake tracker: you log what you drink, it fills an animated character, and it nudges you when you are behind for the day.
Build me a drink tracker as an installable web app. STACK - Plain HTML with a service worker, IndexedDB, no server LOGGING - Preset buttons for the containers I actually use, editable, with a custom amount as a fallback - One tap to log; undo available for thirty seconds - Store amount in millilitres always, and display in the unit I chose THE DAY - A target, a running total, and a single visual that fills - Day boundary is local midnight, with an option to shift it to 03:00 for people who are awake late REMINDERS - Notifications through the Notifications API, only after I grant permission - Skip a reminder if I am already ahead of the pace for the time of day — a reminder that fires when you are on target is why people turn them off HISTORY - A month grid, each day coloured by percentage of target - Averages by week and month, computed from the rows BACKUP - JSON export and import; there is no account and no server Include the schema, the pacing rule and the manifest.
What you lose
- Character animation and illustration that turn a counter into something people actually open
- Apple Health writing, so intake shows up alongside everything else
- Widgets, watch support and reminders that adapt to what you have already logged
If you would rather not build
- Any open-source habit tracker with a numeric goal
- Apple Health, which already stores water intake
- A widget and a tally, which is genuinely enough
The escape hatch
open source · no votes, no paid placement
Loop Habit Tracker
$0Handles measurable habits with a numeric target, not only yes-or-no ones.
iSoron/uhabitsfree · open source
Why this verdict
our own opinion · changed only by a person
93/100
Verdict yes at 93, among the highest here. It is a counter with a nice picture. The pacing rule for reminders is the only design decision that matters.
History
tracked since 10 Aug 2026 · nothing is ever overwritten
Nothing recorded yet. This chart fills in once the page has visitors, votes or prompt copies — it will not draw a flat line to look busy.
Questions about Waterllama
answered from the record above
Is Waterllama free?
No — the plan we track is $2.50 a month. Around $29.99 a year for the full version; the figure shown is that annual price divided by twelve.
Can you replace Waterllama by building your own?
YES. Replaceable in one session with an AI coding agent. Replacement score 93 out of 100, build time one session. Read what you lose before you decide.
How much does Waterllama cost?
$2.50 a month on Premium — $30 a year. Recorded 10 Aug 2026.
What do you lose by replacing Waterllama?
Character animation and illustration that turn a counter into something people actually open; Apple Health writing, so intake shows up alongside everything else; Widgets, watch support and reminders that adapt to what you have already logged. If any of those carry weight for you, keep paying.
Is there an open-source alternative to Waterllama?
Yes: Loop Habit Tracker, Habitica. The prompt on this page is for when you want it your way instead.
Related entries
same category first, most replaced first
Forest
Hevy
YNABEvery week, something stops being worth paying for.
New verdicts, prices that moved, entries added. One email a week. Unsubscribe in one click.
free forever · no tracking pixel · every prompt stays free on the site