Kenzo here, and I've just launched Keepsake - a platform purpose-built for sending meaningful letters. (also on Product Hunt - https://www.producthunt.com/posts/keepsake-3)
Keepsake was initially just a side project and was something I made to learn a new programming language. But since I've launched the MVP of Keepsake to my friends and family last August 2020, Keepsake has gotten over 300 users and 500+ letters with around 400 of them already delivered. I got a lot of encouraging feedback in the process, and now I'm very excited to share the improved version with a larger audience!
It features 2 main products: Personal and Capsule.
With Personal, think of it as your own virtual envelope for your letters. You'll be getting your own Keepsake link which you can share with anyone (or yourself) to write you letters. Think FutureMe but with audio & video + ask.fm/CuriousCat but intended for meaningful letters instead of creepy questions.
With Capsule, you can create a customizable time capsule of letters for anyone or anything. Perfect as a gift or memento for any kind of event - birthdays, graduations, weddings, employee promotion/recognition, etc. Similar to Personal, a Capsule will generate a unique link which you can share with your letter writers. Think GroupGreeting or Kudoboard but with a greater focus on privacy.
There are also Public Letters and Capsules which you can read on Keepsake, so feel free to explore the platform!
I'm always open to feedback (as it also may have some bugs here and there), so feel free to reach out to me. I hope you enjoy using Keepsake as much as I did making it!