daktilo — time-locked letters

an encrypted letter on paper

Only for iPhone

Free · In‑App Purchases

iPhone

daktilo is an encrypted typewriter. Your letter is encrypted on your phone and turned into a printable origami envelope: the words live as QR codes on paper you fold with your own hands. Our servers never see a single word — there is nothing to hack, nothing to subpoena, nothing to leak. HOW IT WORKS • Write your letter and pick the opening date • It is sealed on your device: the key is locked to a future date using drand, a public randomness network run by independent organizations worldwide • Print the envelope, fold it, hand it over — or share the capsule digitally • On the chosen day, the lock simply falls. The letter opens with the code inside the envelope — even if we no longer exist WHAT MAKES IT DIFFERENT • Opening early is mathematically impossible — not a policy, mathematics • No accounts, no tracking, no analytics, no ads • Every letter carries a verified author stamp (Apple/Google sign-in), sealed inside the encryption — no one can write a letter in your name • Each letter's fingerprint is anchored to the Polygon blockchain: proof that it was written that day and never altered • The capsule format is an open specification — your letter doesn't even need us A letter to your child for the day they grow up. A promise to your partner for your tenth anniversary. Words for a friend to read when the time is right. Some words are worth the wait.

Ratings & Reviews

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Fixed the free letter allowance being shown incorrectly on the sealing screen.

Version 1.0.1

The developer, Sabri Cagrı CAKIR, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Sabri Cagrı CAKIR
    Size
    • 43.8 MB
    Category
    • Lifestyle
    Compatibility
    Requires iOS 16.4 or later.
    • iPhone
      Requires iOS 16.4 or later.
    Languages
    • English and Turkish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © daktilo 2026
  • Developer Website
  • Privacy Policy

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