The best alternatives to Only Reminder are Hints, WhatsApp, and elocance 2.0. If these 3 options don't work for you, we've listed a few more alternatives below.
WhatsApp Messenger is a FREE messaging app available for iPhone, Android, and other smartphones. WhatsApp uses your phone's Internet connection (4G/3G/2G/EDGE or Wi-Fi, as available) to let you message and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, documents, and Voice Messages.
elocance is a mobile app that lets you save and curate YOUR OWN content, turn it to audio and listen on the go. Features include HD voice options and accents you can pick from, playlists, newsletters directly in the app, reminders for when to listen and more!
You're online all day. Why not use the browser to remind you of things? One time or recurring? You set the timing, Best Reminder App helps you never forget.
Salepager let's you automatically send branded reminders for Zoom meetings with registration. Simply sign up and connect your Zoom account.
https://salepager.com/