New: Time to Fly. Every flight on your calendar gets an alarm when it's time to leave for the airport. Plus a fresh new look and custom alarm sounds.
“Are you joining the meeting?”
If you've ever gotten that message while you were sidetracked by an email, a task, or one more thing, OnTimer is for you. Calendar notifications are easy to swipe away. OnTimer turns your calendar into real alarms, so a missed notification doesn't become a missed meeting, or a missed flight.
Connect your Google, Outlook, or Apple Calendar once, and OnTimer does the rest: a persistent alarm when it's time to act, a Time to Leave alert when it's time to head out, and now Time to Fly for every flight on your calendar.
NEW: TIME TO FLY
Every flight on your calendar gets an alarm when it's time to leave for the airport. OnTimer recognizes flights your email and travel apps add to your calendar, or just put the airport code, like JFK, in an event's location.
Your leave time combines airline-recommended arrival times (2 hours domestic, 3 hours international) with your drive, parking, and whether you're checking a bag. Connecting flights don't get a second alarm, and you can adjust any flight from its card.
CUSTOM ALARM SOUNDS
Make your alarms your own. Choose a sound for your main alarm and another for Time to Leave alerts, or give one event its own sound. Preview every sound for free. More sounds are coming soon.
HOW IT WORKS
OnTimer uses your calendar as the source of truth. When your schedule changes, your alarms stay in sync, so you never create or maintain alarms by hand.
Unlike notifications that disappear after a swipe, OnTimer's alarms keep reminding you until you dismiss them. High Alert can ring through Silent mode and Focus on iOS 26.1 and later. Prefer quieter alerts? Medium Alert respects Focus.
TIME TO LEAVE ALERTS
For events with a location, OnTimer watches traffic and tells you exactly when to head out. Choose your travel mode and add a departure buffer.
ESPECIALLY HELPFUL IF YOU
• See calendar reminders and still leave late
• Get focused and lose the last few minutes before a call
• Need alarms that keep going until you act
• Use more than one calendar
• Experience time blindness or notification overload
FREE
• Connect one Google, Outlook, or Apple Calendar
• Automatic alarms for every calendar event
• Persistent alarms with High and Medium Alert
• Time to Fly airport alarms
• Recurring event controls
• Focus & Silent Mode settings
PREMIUM
• Connect multiple calendars across work and personal life
• Time to Fly live traffic updates and a night-before heads-up
• Time to Leave alerts with live traffic
• Early Warning alerts before your main alarm
• Custom alarm timing for individual events
• Custom alarm sounds
• Business Hours
• 7-day free trial on the annual plan
OnTimer works quietly in the background, so you never have to think about setting alarms again.
Download OnTimer today and never be late again.
Some features require a paid subscription. Monthly and annual subscription options are available in the app. Pricing varies by region and is shown before purchase.
Terms of Use:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
I use Claude to plan my entire schedule. Meds, training, client calls, wind down, all of it. Claude writes the day to my Google Calendar and that used to be where the system broke, because iOS calendar notifications are useless. Quiet banners you swipe away without looking. I had a perfect schedule sitting in my calendar and still missed half of it. OnTimer fixed it.It reads my calendar and automatically creates a real alarm for every event. Not a notification. A loud alarm that actually cuts through. I don’t build alarms manually. I don’t maintain two systems. Claude writes the plan, OnTimer turns it into sound, and I just live my day. If you searched “Google Calendar to iPhone alarm,” “convert calendar to alarms,” “AI calendar alarm,” “Claude calendar sync,” or “ADHD calendar alarm app,” this is it.The developer is also a real human (I won’t say his name for privacy) who actually cares. Responsive, fast, works the problem with you, ships fixes. Almost extinct in the App Store right now. Setup took two minutes. Loud alarms. Customizable lead time. If you use AI to plan your life and you’re on iPhone, OnTimer is the piece that closes the loop.
Just about perfect!
D Becker
OnTimer has completely changed how I stay on top of my day. The seamless integration with Google Calendar makes setting reminders effortless, and everything just works exactly when you need it. It’s simple, reliable, and incredibly helpful—especially for keeping important tasks from slipping through the cracks. A smart, well-designed app I didn’t know I needed but now use every day. Well done!
A great app!
Halanor
App does exactly what it claims in a simple, quick and elegant way. Especially for someone like me who has multiple meetings and various arrangements across multiple calendars it was a breeze to setup and keep me well organized so I don’t miss anything scheduled.
Keeps me on time
Humanatee321
My grandfather always told me that if you’re on time, you’re five minutes late. Ontimer make sure that I’m never on time but rather early and impress my meeting.
Developer Response
Glad you are finding it useful and let us know if we can make it better.
Smarter alarms for the meetings that matter
OnTimer now understands your calendar better. Declined meetings stay out of your alarm list, and for hybrid meetings you can choose whether you're joining online or attending in person—so travel alerts appear only when you need them.
Fewer unnecessary alarms. Less calendar cleanup. More confidence that the right meeting will ring at the right time.
Version 1.2.24
The developer, Ethan Garr, 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 Linked to You
The following data may be collected and linked to your identity:
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More