Callie is here—now in Open Testing on Google Play. It’s a fast, clean, privacy-first calculator built for everyday math, with Classic & Scientific modes and a full Unit Converter. No accounts. Works offline. Optional one-time purchase to remove ads.

Get the beta

  1. Open the Google Play link: Join Callie Open Testing.
  2. Tap Join (Open testing) → Install.
  3. Use Callie for your day-to-day, then send feedback from the app menu or email support@clairos.ai.

Why Callie?

  • Speed & clarity: minimal UI, large tap targets, haptics, smart copy/paste.
  • Classic & Scientific: memory keys, percent, parentheses, exponent, roots, trig (deg/rad), logs.
  • Unit Converter: length, area, volume, mass/weight, temperature, time, data, speed, pressure, energy (more categories coming).
  • Quick Calculators: tip/split, discount/sale price, mortgage/loan, percentage change, and more (expanding through testing).
  • Privacy-first: no accounts, no analytics. Works fully offline. Banner ads only; one-time in-app purchase removes ads.
  • Multi-language: the interface supports multiple languages (rolling out during open testing; tell us what you need next).
  • Dark mode: looks great day or night.

Roadmap we’re validating in Open Testing

  • History with search & pinned results
  • Widgets & quick actions
  • More unit categories & presets
  • Extra quick calculators based on tester feedback
  • Localization expansion across high-demand languages

How you can help

Open testing is where Callie gets sharpened. If something feels clunky, if you’re missing a conversion, or if a translation needs love—tell us. The fastest path is in-app feedback; you can also email support@clairos.ai.

FAQ

Is Callie free?
Yes. It’s free with banner ads. You can remove ads forever with a one-time in-app purchase.

Does it work offline?
Yes. All core features work without an internet connection.

Which languages are supported?
English is complete; additional languages are rolling out during open testing (including Spanish, French, German, Italian, Portuguese, Arabic, Greek, Hindi, Indonesian, Japanese, Korean, Simplified Chinese, Turkish, Russian, and more). Need one prioritized? Email us.

What Android versions are supported?
Modern Android phones and tablets (most devices from the last several years). If you hit a device-specific issue, please report it.

How do I share feedback or report a bug?
Use Help & Feedback in the app menu or email support@clairos.ai.

Big Brain. Small Screen. Thank you for helping us finish Callie 1.0.