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Your data. Your phone. Nobody else's.

Optional Labs makes four everyday apps. Each one keeps what you put into it on your phone, not on our servers.

Explore the apps How we build

Your app data sent to Optional Labs

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Your codes, cards, papers and letters stay on your phone. Optional Labs never receives them.

Four apps. One rule.

Each app fixes one everyday problem, and keeps what you give it on your phone.

  1. ZeroAuth

    Authenticator for iPhone and Android

    The problem
    Many authenticator apps sync your secret keys to the cloud, where one breach can expose every code.
    What we fixed
    ZeroAuth makes your codes on the phone, with no internet needed, and keeps the keys in an encrypted vault that never leaves it.
    • Codes work offline
    • AES-256-GCM vault
    • Face ID and fingerprint lock
    More about ZeroAuth Visit zeroauth.in Download ZeroAuth on the App Store Get ZeroAuth on Google Play

  2. Saifu

    Credit card advisor for India

    The problem
    With a few credit cards, it is hard to know which one pays most at checkout, and fee waivers, monthly caps and expiring points slip by.
    What we fixed
    Saifu ranks your cards for each spend and warns you before a fee waiver, a cap or your points run out.
    • 336 Indian cards listed
    • Spends stay on your phone
    • No card numbers or bank login
    More about Saifu Visit saifu.in Find my best card Web tools live now. App coming soon.

  3. Parchi

    Family medical papers

    The problem
    Prescriptions, lab reports and hospital bills pile up in drawers and photo galleries, and the one you need is never at hand at the doctor's.
    What we fixed
    Parchi reads each paper on your phone, files it under the right family member and makes a one-page summary for the next visit.
    • Read on the phone
    • Medicine reminders
    • Health card per person
    More about Parchi Visit getparchi.com Coming soon to App Store and Google Play

  4. Tegami

    City-hall letters, for residents of Japan

    The problem
    Letters from Japanese government offices come in formal Japanese, with deadlines, amounts and era dates that are easy to miss.
    What we fixed
    Tegami tells you what the letter is, what to do and by when, in plain English, without the letter leaving your phone.
    • Deadlines pulled out
    • Era dates converted
    • Letters encrypted on the phone
    More about Tegami Visit Tegami Coming soon to the App Store

How we build

The rules our apps are built on, and what each app does to keep them.

Your data stays on the phone.

  • ZeroAuthVault encrypted with AES-256-GCM, with keys held in the phone's secure hardware.
  • SaifuYour cards and spends stay on your phone.
  • ParchiPapers are read by the phone itself, not by a server.
  • TegamiLetters are encrypted on the device and never leave it.

Nothing to sign up for.

  • SaifuNo sign-up and no account. No card numbers and no bank login.
  • ParchiNo account to make and no server to sign in to.
  • TegamiNo account, no server, no analytics.

Show our work.

  • ParchiEvery detail it reads sits next to the original photo, for you to check and correct.
  • TegamiSee the original letter and the exact text that was read, beside the explanation.
  • SaifuCard rules not yet checked against the bank's terms carry a warning, and affiliate links are labelled.

Pick an app. Keep your data.