Function Fitter vs Taqvim

Function curve fitting using custom function that you enter. Reads data values either from file or manual entry, and tries to fit your function to the data by adjusting 1 to 4 parameters for a least-squares best fit. For enjoyment only, NOT for serious data needs. This is minimalist by design with no ads, no in-app purchases, no bells and whistles, and no fancy moving graphics to distract you, just fun. Note: Entertainment value only, fun using different parameter starting values.

Taqvim is a clean, beautifully designed Persian (Solar Hijri / Jalali) calendar. • Today at a glance — live Tehran time, the Persian date, plus the Gregorian and Hijri equivalents. • Sun-based prayer times for Tehran (Fajr, sunrise, Zuhr, sunset, Maghrib). • Month view with official Iranian holidays. • Day detail with full date conversions, day of year, season, and day length. • Date converter — spin the wheels to convert any Solar to Gregorian date, with the Hijri date shown too. • Reminders — add birthdays or any occasion, repeat yearly, and get a notification 24 hours before. • Upcoming view that lists your reminders and holidays with a countdown. • Home-screen widget showing today's Persian date. All data stays on your device. No accounts, no tracking.