Exact math and fractions
Handle arithmetic, scientific functions, precedence, and fractions with readable local steps and reusable results.
Units and currencies
Convert across 12 unit categories and 166 bundled ISO-oriented currency references with freshness and cache/offline fallback.
Reusable history
Search, filter, favorite, copy, delete, and refill results so one calculation can naturally become the next task.
Focused tools and OCR
Use wage, compound, A-share limit, cycle, age, and BMI reference tools; photo problems enter an editable on-device OCR field first.
Who it is for
Study, work, and everyday decisions
Check a fraction, convert a temperature, compare a reference currency rate, or carry a result into the next step from one clear workbench.
Local first
Core math, units, tools, and history run on the device by default, with no account required.
Network by choice
Currency refresh and optional semantic solving run only when you actively use them, with visible reference and failure states.
iPhone and iPad
iPhone stays compact for one-handed work; iPad adds a sidebar, main workspace, and contextual results.
Important notes
Currency, wage, compound, A-share limit, cycle, and BMI outputs are reference calculations or estimates, not investment, payroll, medical, or fertility advice. Photo OCR starts on device; external solving is off by default and sends confirmed text only after the user configures and actively retries.