Congrats on the launch. I've been doing something similar using email. I have an email account for both of my kids and I send them email that I hope will be fu

Congrats on the launch. I've been doing something similar using email. I have an email account for both of my kids and I send them email that I hope will be fun for them to read once they're older. I don't trust anything though - so in order to feel like the messages would be around for them when they're older I have a Zapier Zap which converts the email too a text file that gets stored in Dropbox. (I also don't trust Dropbox so I have my Dropbox account sync to a Synology device at home). The points being... 1) I think many people generally want to do this but if it's not super easy then they won't keep doing it (email was the lowest friction way I could think of). 2) I'm not sure how big a market "many people" is and I wonder if they'd pay. 3) Expect to get many "how do I know you'll be around on the date I choose to send?" responses. I see you offer PDF download and that might be sufficient - It wouldn't be for me but might be for others. :) Good luck!