OnTimer vs On
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnTimer
This app transforms calendar notifications into persistent alarms, ensuring you never miss important events like meetings or flights. It offers smart alerts for travel, customizable sounds, and integrates with your existing calendars to keep you on track.
- Persistent calendar alarms
- Time to Leave alerts with traffic
- Time to Fly airport alarms
- Customizable alarm sounds
- Integration with Google, Outlook, Apple Calendars
- Snooze functionality
- High Alert through Silent/Focus modes
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“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. 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. YOUR OWN ALARM SOUNDS Make your alarms unmistakably yours. Import a sound you recognize instantly and use it for your main calendar alarm, Time to Leave, Time to Fly, or an individual event. You can also choose from OnTimer's built-in sounds and preview them before deciding. 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. SNOOZE WHEN YOU NEED A FEW MORE MINUTES Open a High Alert to snooze it, and OnTimer will remind you again. When multiple events need your attention at the same time, OnTimer brings them together in one clear alarm. 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 • Unlimited snoozing with customizable snooze options • Import and use your own 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/
On
This app calculates the optimal alarm time by factoring in your morning routine, commute, and buffer time for unexpected delays. Simply input your preparation duration, travel time, and desired arrival, and it instantly provides the perfect wake-up call.
- Calculate alarm time
- Input routine duration
- Input commute time
- Add buffer time
- Intuitive interface
- Copy time to clipboard
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Never be late again! On Time Calculator helps you figure out exactly when to set your alarm based on your morning routine. Simply enter: - How long it takes you to get ready - Your commute time - Extra buffer time for unexpected delays - Your appointment or event time The app instantly calculates the perfect alarm time for you! Perfect for: - Morning commuters - People with important meetings - Anyone who struggles with punctuality - Students and professionals Features: - Simple, intuitive interface - Easy 12-hour time selection - Quick alarm time calculation - Copy time to clipboard - Beautiful starry night design Stop doing the math in your head - let On Time Calculator help you start your day on time, every time!
Screenshots
Verdict
The clearest difference is in-app purchases: On at none against OnTimer's 2. On also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.0). OnTimer's advantage is ratings volume (25 vs 3). On price, rating, review sentiment and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OnTimer sells 2 in-app purchases, starting at $7.99 per month. On asks for nothing beyond the download.
On holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: OnTimer has 25 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
| Parameter | OnTimer | On |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (25 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 25 — better | 3 |
| Update frequency | Every 5 days | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 35 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Ethan Garr | Yuen Jing Liu |
Customer experience
OnTimer
On
In-app purchases
OnTimer
- OnTimer Pro (Monthly)$7.991 Month
- OnTimer Pro (Yearly)7 Days trial$49.991 Year
On
No in-app purchases









