From Viya App Studio
The reminder that never forgets.
Cronk is for everything that repeats but never belongs on a calendar — medication, plants, filters, oil changes. Set the rhythm once, and Coco the crow keeps track: nudging until it is done, then quietly scheduling the next one.
- v1.0
- iPhone
- iOS 18.1+
- 10 languages
- No account
Free for up to 5 reminders with every feature included, iCloud sync among them. Cronk Unlimited is one optional one-time purchase — never a subscription, never ads.
What it looks like
Due today, due in six days, due in ten years
One list, grouped by when things are actually due. The intervals a calendar cannot express and a to-do app forgets to chase.
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Everything due, grouped by when — not by the list it came from.
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Any rhythm, from every 8 hours to every 10 years.
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Coco follows up, and gets less polite about it.
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Every completion kept, with notes — proof, not just a reminder.
How it works
Three steps, and then it keeps itself going
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Set the rhythm
Pick any interval from one hour to 999 years — or start from one of 31 templates for the things people actually forget: HVAC filters, smoke detectors, medication, oil changes.
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Coco follows up
Miss it and the nudges escalate — 30 minutes, 1 hour, 2, 4 — then settle into one a day for up to 14 days. They are Time Sensitive, so a 9 PM medication reminder arrives even during Sleep Focus.
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Mark it done
From the widget, the notification, or Siri, without opening the app. The next one is scheduled a full interval from that moment, and the completion is logged with a timestamp and your note.
Features
Everything, on the free tier too
The purchase lifts one number — how many reminders you can keep. Every capability below is in the free version.
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Any interval, hours to years
Every 8 hours, every 3 days, every 6 months — the rhythms a calendar cannot schedule and a to-do list forgets to chase.
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Escalation until it is done
Follow-ups at 30 minutes, 1, 2 and 4 hours, then a single daily nudge for up to 14 days. Coco does not give up.
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A record, not just a reminder
Completion history with timestamps and notes, exportable as CSV — handy for doctors, mechanics, and landlords.
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Widgets, Siri, and notifications
Mark things done from the Home Screen widget, the notification, or Siri, without opening the app.
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iCloud sync, free for everyone
Your reminders follow you across devices through your own private iCloud database — inaccessible to us, and not behind the purchase.
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31 templates to start from
HVAC filters, smoke detectors, medication, oil changes, passport renewals — the things people actually forget, already set up.
Where your reminders live. On your iPhone, and — if you are signed in to iCloud — in your own private iCloud database. There are no accounts and no servers of ours in the path, so there is nothing for us to read and nothing to breach.
Late is not a failure. Complete something late and your cadence holds: the next one stays anchored to the rhythm you set, instead of dragging the whole schedule later every time life happens. Complete it early and Cronk asks whether to re-anchor from today — because sometimes that is what actually happened.
What we measure. A handful of anonymous usage signals through TelemetryDeck — never reminder content, no tracking, no advertising identifiers. Payments are handled entirely by Apple. The privacy policy spells out all three kinds of signal.
Pricing
Free to use. One purchase when five is not enough.
Nothing is crippled on the free tier — only counted. The price is shown in the app before you buy, and it is a purchase, not a plan.
Cronk is free for up to 5 reminders with every feature included — iCloud sync among them. Cronk Unlimited is a single one-time purchase that lifts the count. Never a subscription, never ads.
| Feature | Free | Unlimited |
|---|---|---|
| Reminders | 5 | Unlimited |
| Any interval, hours to years | Included | Included |
| Escalating notifications | Included | Included |
| Completion history & CSV export | Included | Included |
| Widgets, Siri & Spotlight | Included | Included |
| iCloud sync across devices | Included | Included |
| 31 starting templates | Included | Included |
FAQ
Common questions
Is Cronk a subscription?
No. Cronk Unlimited is a one-time purchase that lifts the 5-reminder limit. It never renews, and there are no ads.
What does the free plan include?
Up to 5 reminders with every feature — escalation, history, all intervals, widgets, Siri, and iCloud sync. Nothing is crippled; only the count is limited.
What if I complete something late?
The next reminder stays anchored to your original rhythm. Complete early, with a confirmation, and Cronk re-anchors from today — matching what actually happened.
Will reminders break through Focus?
Due and escalation notifications are Time Sensitive, so a 9 PM medication reminder arrives even during Sleep Focus. You can turn this off in iOS Settings.
Where does my data live?
On your device — and, if you are signed in to iCloud, in your own private iCloud database. No accounts, no servers, nothing we can read.
Can I get my reminders out again?
Yes. Cronk exports a full JSON backup and a CSV of your completion history, and imports the backup on a new device. Your data is not held hostage by the app.
Get Cronk
Cronk v1.0 · iPhone · iOS 18.1+ · 10 languages · no account required.