The best alternatives to Tiny Reminder are Single Clock, Taxarly, and Hapen. If these 3 options don't work for you, we've listed a few more alternatives below.
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Your companion app to remind you of all income tax and GST related due dates. Penalties for missing a due date can be extremely high - with Taxarly, you have a reminder system that will ensure you never have to pay these penalties again!
Soon is a simplistic reminder application for macOS menubar to quickly add small post-it like reminders. When the time comes, Soon sends a system notification to remind your note. The duration for a reminder can be defined in seconds, minutes or hours.
Memo Reminders is application that will help you to do the thing you are often "forgetting", postponing, have a "valid" excuse for not doing it or simply: procrastinating.
Make meaningful reminders and have them show up at random times throughout the day, during time periods of your choosing. And add widgets to your home screen! One-time purchase for iPhone, iPad, and Mac.
Get sh*t done with Humemo. If you're a procrastinator and love putting off stuff that you just have to do, Humemo will help you get that sh*t done. Every reminder is persistent until marked done and will haunt you until you do it.