Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Future Me - Send an email to your future self
Felt for iPhone - Handwritten cards for the modern world
Timebomb Messenger - Send secret messages that open based on time or location 💣
Punkpost - Send handwritten cards as quick as texting
Letter to Yourself - Send a physical letter to your future self