
Alarmy
stagetimer.io
Due
EventTimer.io
Fantastical Scheduling
Google Calendar
Microsoft Outlook Calendar
OnTimer connects to your calendar and automatically sets alarms before meetings so you're never late again. Free iPhone app.

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Website, pricing, platforms and company facts side by side.
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| Website | ontimer.app | opalstack.com |
| Pricing | — | |
| Company | Startup from the United States · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


OnTimer is a calendar reminder app designed to make sure you are never late for meetings, calls, or appointments. While standard calendar notifications are easy to miss or can fail due to silent mode, focus settings, or device limitations, OnTimer adds a reliable reminder layer that ensures you...
No description of Opalstack yet.
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Share your experience with using OnTimer.app and Opalstack. For example, how are they different and which one is better?
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