zerocal - zero effort calendar
Natural language event planner
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Paste a group announcement and every event goes in at once. Or share it, or just tell Siri. Scheduling should cost zero calories.
How many taps does it take to add one event?
zerocal's goal: make using a calendar cost zero calories.
■ One sentence is all it takes
Write "Tomorrow 3pm dentist", "every other tue swim" or "last friday of every month team dinner" —
dates, times, and repeats are recognized as you type, including ranges like "3pm to 4pm".
The words it understood get highlighted, and you see where the new event
lands among that day's plans — overlaps included — before you add it.
Texting shorthand works too (tmrw 3p), and so does Korean. Or just pick the date, range,
repeat, alert, and notes with buttons.
■ Every event in a message, at once
Paste a group announcement or an email and zerocal finds every event in it.
Add the ones you check in one go — times listed under a date line get that date.
■ Share sheet and Siri
Share text from Messages, Mail or Notes, or say "Add an event in zerocal" —
events go in without opening the app.
■ Add events by voice
Tap the mic and speak. Your words appear in real time,
with the date and time parsed automatically. Korean and English
are told apart on their own — no setting to flip.
■ Read your month at a glance
Event titles appear right inside the calendar grid —
no tapping into each day. Trips and other multi-day events show up
on every day they cover, and you can drag an event to another date.
Pull the bottom panel all the way up for a day timeline where you drag events
to change their time and length.
■ Works with your existing calendars
Google, Outlook, and iCloud events connected to your iPhone
show up alongside your own — and you can save new events
straight to them, or hide the calendars you don't need.
■ Home and Lock Screen widgets
See today's and upcoming events without opening the app.
The Month widget shows the whole month; tap a day to open it.
Tap the "Add by Voice" widget to jump straight into voice entry.
■ Fast actions, no nag dialogs
Swipe to delete your own events. Made a mistake? One tap undoes it.
Only connected-calendar events — which can't be undone — ask once.
■ Make it yours
Light/dark mode, seven highlighter colors, locations with Maps,
several alerts per event, repeats like every other week or the last Friday of the month,
and .ics export.
■ zerocal Pro
Repeats recognized from your sentence, adding every event in a message at once,
the share sheet, Lock Screen, Month and "Add by Voice" widgets,
seven highlighter colors and three designs come with zerocal Pro
(monthly or yearly subscription, or a one-time lifetime purchase).
Adding events by sentence, by voice and with Siri is free, with no limits.
■ Zero data collection
No accounts, no servers. Everything stays on your device.
No ads, no tracking.
Make your calendar cost zero calories.
■ Subscription details
zerocal Pro Monthly (1 month) and Yearly (1 year, with a 7-day free trial) are auto-renewable subscriptions.
Payment is charged to your Apple Account, and the subscription renews unless canceled at least 24 hours
before the end of the current period. Manage or cancel anytime in Settings > Apple Account > Subscriptions.
The Lifetime option is a one-time purchase.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://zerocal.goodflow.dev/privacy/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
■ Every event in a message, at once (Pro)
Paste a group announcement or an email into a new event and zerocal finds every event in it. Add the ones you check in one go.
■ Share sheet (Pro)
Share text from Messages, Mail or Notes to zerocal — no need to open the app.
■ Siri
Say "Add an event in zerocal", then the event. It goes in without opening the app.
■ More ways to repeat
"every other Tue", "every Mon, Wed and Fri", "every weekday", "last Friday of every month".
Set the interval, days and number of times yourself in the repeat editor. (Recognizing repeats in your sentence is Pro.)
■ Several alerts
Up to five alerts per event.
■ Alerts for synced events
When a Google or other synced event has no alert, zerocal reminds you instead. (Settings › Alerts for synced events)
■ Month widget (Pro)
See the whole month on your Home Screen. Tap a day to open it.
■ Landscape
Turn your iPhone sideways: the month on the left, the day's events on the right.
■ Understands more
Time ranges like "3pm to 3:15pm" and texting shorthand like tmrw and 3p.
■ Fixes
· A just-saved event no longer warns that it overlaps itself
· The swipe-to-delete button is visible in dark mode again
The developer, Hyunwook Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hyunwook Kim
- Size
- 4 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- zerocal Pro Lifetime $29.99
- zerocal Pro Yearly $14.99
- zerocal Pro Monthly $2.99
- Copyright
- © 2026 goodflow