https://www.whatstime.co/en-US

Hey HN, I need a feature to schedule messages on WhatsApp in a delivery service I have, so I came up with the idea of transforming this feature into a micro-SAAS. With WhatsApp, you connect your cell phone to the application and import your contacts. You can easily schedule recurring messages for as many contacts as you want. It currently only accepts text messages, but in the near future it will also accept sending files.

I believe this application can help you, and I would appreciate any feedback.