Words that arrive at the perfect moment
Write letters with drawings, voice notes, and stamps — then set a trigger so they arrive at a place, a time, a mood, or even the weather.
Opens your email app — just hit send to request your invite.
See when in action
A quick look at the magic behind every letter.
Everything you need to send letters that matter
One cozy experience.
Smart Triggers
Location, date, mood, weather — or combine them. Your letter waits until every condition is met, then arrives like magic.
Rich Media Letters
Drawings, voice notes, GIFs, custom stamps, and beautiful backdrops. Every letter is a tiny work of art.
Physical Mail
Send real, printed letters domestically or internationally. Track delivery and enjoy discounts with When+.
Coin Economy
Earn coins through daily logins, sending letters, completing prompts, and achievements. Spend them in the marketplace.
Marketplace & Creators
Browse stamps, backdrops, bundles, and mystery packs. Creators can list and sell their own designs.
Social & Pen Pals
Friends, pen pals, letter chains, group letters, stamp trading, and referrals — a cozy social layer for letter lovers.
Time Capsules
Seal a collection of letters to your future self or someone you love. They wait patiently until the moment is right.
Prompts & Journals
Daily writing prompts, journal letters, burn letters, and special templates for apologies, gratitude, and condolences.
When+ Premium
AI writing assist, exclusive themes, premium stamps, 2× coin multiplier, physical mail discounts, and priority support.
A glimpse inside when
Hand-crafted for moments that matter.
Home & daily rewards
Compound triggers
The magic moment
Fun unlock challenges
Read, react & reply
Marketplace & stamps
How it works
Four simple steps to send a letter that truly matters.
Write a letter
Rich text, voice notes, drawings, GIFs, and custom stamps. Pick a backdrop, add attachments — make it yours.
Set your triggers
A location, a date, a mood, the weather — or combine multiple triggers so the letter only unlocks when every condition aligns.
It waits patiently
Your letter sleeps until the conditions are met. No peeking. Or send it as physical mail and it travels the old-fashioned way.
The magic moment
Conditions met — the letter arrives with an animation. They read, react with emojis, reply inline, and the conversation blossoms.
When+
Unlock the full experience with a subscription that actually adds value.
Get early access to when
Join the closed beta, hit send on the pre-filled email, and you'll be in.
Opens your email app — just hit send to request your invite.