Get Reckon Pro free
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Open the Google Play Store, tap your profile → Payments & subscriptions → Redeem code, and paste it. Codes expire June 30, 2026.
About
Reckon is a precision unit converter for Android. Eight everyday categories (length, weight, volume, temperature, time, cooking, energy cost, and a set of date tools) are free forever. One $2.99 unlock adds 26 specialist, engineering, and scientific categories, an optional scientific keypad, conversion history, and favorites. Live currency conversion is one of the Pro categories and is the only feature that ever uses the network; every other category works fully offline. Japanese traditional units (shaku, sun, ken, ri, kan, monme, tsubo, jō, shō, gō, koku) are first-class throughout, not bolted on.
What it does
- 34 categories spanning everyday, specialist, engineering, and scientific units
- Japanese traditional units throughout
- Currency with a three-tier live provider chain (USD-pinned), fetched only on demand
- No ads, no account, no analytics
What you get free, and what the $2.99 unlock adds
Free
- Length, Weight, Volume, Temperature, Time, Cooking, Energy Cost, and Date tools
- Date tools: age from date of birth, days between dates, date ± N days
- Single or multi-unit display; Light / Dark / System theme
Pro · $2.99 one-time
- Area, Speed, Energy, Power, Pressure, Fuel Economy, Data, Frequency, Angle, Base / Numeric, SI / IEC Prefix
- Engineering set: Force, Torque, Density, Sound, Concentration, Flow Rate
- Scientific set: Heat Density, Moment of Inertia, Illuminance, Magnetism, Electric Charge, Radiation
- Clothing Size and Shoe Size (US / UK / EU / JP)
- Live Currency with a three-provider failover chain and 24h cache
- Optional scientific keypad (sin, cos, tan, log, ln, √, π, expressions)
- Last 50 conversions in history; up to 20 favorites
Accuracy and limitations
Reckon's Currency category shows daily reference exchange rates from public providers (primarily the European Central Bank feed), not live interbank or trading rates, and it caches them for up to 24 hours. Use them for everyday estimates and conversions, not for trading, settlement, or any decision that needs to-the-second pricing. Every other category is exact unit math. Apparel sizing (Clothing and Shoe Size) maps published regional size charts; real garments vary by brand and cut, so a brand-variation note appears beneath every sizing result.
Privacy at a glance
- No personal data is collected by Reckon.
- All app data is stored on your device.
- No analytics, no telemetry, no crash reporting.
- No account is required to use the app.
Read the full Reckon privacy policy or learn about account and data deletion.
Permissions Reckon requests
- Internet
- Used only by the Pro Currency category to refresh daily exchange rates from one of three providers (api.frankfurter.dev, open.er-api.com, or cdn.jsdelivr.net), and to verify your purchase with Google Play. Every other category works fully offline.