Numi

Numi combines written notes with calculations, unit conversion, currencies and dates. Its desktop documentation uses variables and earlier-line results to build a worksheet; copy a result, print it, or export UTF-8 plain-text .numi files. Import leaves the original file unchanged until an explicit export. Parsing conventions matter: SI prefixes are case-sensitive, data multiples use 1,000 unless kibibytes are named, trigonometric functions default to radians, and duration arithmetic treats a year as 365 days and a month as one twelfth of that. The paid activation page offers unlimited notes and iCloud sync. The terminal edition has a narrower feature set, omitting dates, time zones, sum/previous/average tokens, localisation and extensions. The repository's MIT label should not be taken as the desktop app's licence: the app has a separate restrictive EULA.