OneCalc Pro: Calculator & Pay
Tools In-app purchases
Calculator, converter, pay tracker and maths solver in one calm, ad-free app.
- Downloads
- 2+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- Oct 29
- 2026 · v1.0.3
Screenshots
About OneCalc Pro: Calculator & Pay
One calm, capable calculator that replaces a dozen apps on your phone.
OneCalc Pro brings together everyday maths, scientific functions, currency and unit conversion and a genuinely useful pay tracker in one beautifully simple app. No ads. No accounts.
STANDARD AND SCIENTIFIC CALCULATOR
Switch instantly between a clean everyday calculator and full scientific functions (trig, logs, powers, roots, factorials, memory), with a scrollable history so you never lose a previous sum.
PAY AND OVERTIME TRACKER
Built for shift workers. Add jobs and pay rates, set daily and weekly overtime, night and weekend rates, then clock in and watch your earnings update live. Weekly and monthly totals, every shift broken down line by line, and CSV export for your spreadsheet.
SCAN & SOLVE
Photograph a maths problem from a textbook, worksheet or whiteboard and get a clear, step-by-step solution in seconds. Works on any Android phone.
CURRENCY, UNIT AND TIME CONVERSION
Convert between 30+ currencies using official European Central Bank rates, cached so they work offline too. 174 units across 24 categories, from kilometres and kilograms to cooking measures and shoe sizes. Add up hours and minutes or work out the time between two dates.
PERCENTAGES, VAT, DISCOUNTS AND LOANS
Add or remove VAT, split a bill and tip, work out sale prices and stacked discounts, or see monthly repayments and total interest before you take out a loan.
MADE FOR ANDROID
• Home-screen calculator widget – keys work without opening the app
• App shortcuts to Scientific, Converter, Pay Tracker and Scan & Solve
• Clock out straight from the notification
• Material You themed icon and 9 accent colours
FREE AND PREMIUM
Standard, Scientific, Converter, Time and Percentage are free. Premium unlocks the Pay Tracker, Scan & Solve, Currency, Discount and Loan tools and all themes, with a 3-day free trial. Choose £9.99 a year or £29.99 once for lifetime access.
PRIVATE BY DESIGN
Your calculations, jobs and shifts stay on your phone. Scan & Solve sends only the photo you choose to Google Gemini through our server to read and solve it; photos are not stored. Delete all your data any time in Settings.
Terms: https://annmarstudio.co.uk/onecalc/terms
Privacy: https://annmarstudio.co.uk/onecalc/privacy
OneCalc Pro brings together everyday maths, scientific functions, currency and unit conversion and a genuinely useful pay tracker in one beautifully simple app. No ads. No accounts.
STANDARD AND SCIENTIFIC CALCULATOR
Switch instantly between a clean everyday calculator and full scientific functions (trig, logs, powers, roots, factorials, memory), with a scrollable history so you never lose a previous sum.
PAY AND OVERTIME TRACKER
Built for shift workers. Add jobs and pay rates, set daily and weekly overtime, night and weekend rates, then clock in and watch your earnings update live. Weekly and monthly totals, every shift broken down line by line, and CSV export for your spreadsheet.
SCAN & SOLVE
Photograph a maths problem from a textbook, worksheet or whiteboard and get a clear, step-by-step solution in seconds. Works on any Android phone.
CURRENCY, UNIT AND TIME CONVERSION
Convert between 30+ currencies using official European Central Bank rates, cached so they work offline too. 174 units across 24 categories, from kilometres and kilograms to cooking measures and shoe sizes. Add up hours and minutes or work out the time between two dates.
PERCENTAGES, VAT, DISCOUNTS AND LOANS
Add or remove VAT, split a bill and tip, work out sale prices and stacked discounts, or see monthly repayments and total interest before you take out a loan.
MADE FOR ANDROID
• Home-screen calculator widget – keys work without opening the app
• App shortcuts to Scientific, Converter, Pay Tracker and Scan & Solve
• Clock out straight from the notification
• Material You themed icon and 9 accent colours
FREE AND PREMIUM
Standard, Scientific, Converter, Time and Percentage are free. Premium unlocks the Pay Tracker, Scan & Solve, Currency, Discount and Loan tools and all themes, with a 3-day free trial. Choose £9.99 a year or £29.99 once for lifetime access.
PRIVATE BY DESIGN
Your calculations, jobs and shifts stay on your phone. Scan & Solve sends only the photo you choose to Google Gemini through our server to read and solve it; photos are not stored. Delete all your data any time in Settings.
Terms: https://annmarstudio.co.uk/onecalc/terms
Privacy: https://annmarstudio.co.uk/onecalc/privacy
What’s new
Version 1.0.3 · Updated October 29, 2026
Calculations now always follow the order of operations, including the home screen widget and the time calculator, plus fixes for negative numbers and percentages.