RepubliCal vs SoilHue

RepubliCal allows you to use the French Republican Calendar not just as a converter, but as what it was intended to be: a calendar! The app uses the original leap-day system (the only one which was ever legaly used during the French Revolution), meaning new years start on the fall equinox and leap days are calculated instead of having a rule. This means, unlike in the Gregorian Calendar, dates won't shift in relation to the seasons. Available dates and conversions range from 1792 to 2126 (years 1 to 334), after which calculation of equinoxes becomes less reliable. The app includes everything to have time-keeping be fully independent from the Gregorian calendar. It doesn't only display the current date, but also allows you to: - Visualize the year and actively interact with the Republican months. Scroll through the years and months to your heart's content! - Check and convert dates within the 334 year range. See what your Republican birthday is! - Create and delete reminders for specific dates. Got a picnic in a week? You'll get a notification in 10 days! - Have handy widgets to show the Republican date in both your lockscreen and homescreen - See the daily celebrations that have been assigned to each date. It includes an option to display Gregorian equivalents as well, for those who want to see both systems. Although years were normally displayed using roman numerals, you can change the way they are displayed with a simple tap. For more information about the French Republican Calendar and its historical significance, check out the Wikipedia page! EHM

SoilHue identifies the Munsell color of a soil sample from a photograph taken with your device. It is built for pedologists, agronomists, geologists, archaeologists, conservators, soil-science students and anyone who works with soil color in the field. WHAT IT DOES • Calibrate the camera with an X-Rite ColorChecker Classic. SoilHue detects the card automatically inside your photo, rectifies its perspective, and computes a 3×3 correction matrix by least-squares fit over the 24 reference patches. • Take a photo of your soil sample (or pick one from your library) and select the area to analyze with a rectangle or a free-form polygon. • SoilHue averages the selected pixels in linear sRGB, applies your calibration matrix, and finds the closest match in CIE Lab among 293 chips derived from the official USDA Munsell renotation data. • Get the Munsell notation, an approximate USDA soil order (Histosol, Mollisol, Alfisol, Oxisol, Vertisol, Spodosol, Aridisol, Entisol, Inceptisol, Ultisol) and a short description. WHAT'S NEW IN 2.0 • 293 reference chips instead of 18. • ΔE94 in CIE Lab instead of Euclidean RGB. • Matrix 3×3 calibration replacing per-channel factors. • Automatic ColorChecker detection (Vision framework). • Printable calibration card (2-page A4 PDF, ICC sRGB). • Lighting check (warm/cool/atypical tint warning). • Real .xlsx export. • Accessibility, dark mode and stability improvements. DATA & PRIVACY • All analysis runs on-device. No image, sample or location ever leaves your phone. • Samples are stored locally in your app sandbox. iCloud sync is planned for a future release. • Location is captured only when you explicitly grant it. REQUIREMENTS • iPhone or iPad running iOS 17.6 or later. • A reasonably calibrated camera. Recommended: X-Rite ColorChecker Classic for best results. A basic calibration card is included for casual use. NOTES The USDA soil order classification is a heuristic orientation, not a definitive diagnosis — real classification depends on horizon, chemistry, texture and other field properties. Calibrations saved with versions before 2.0 are not compatible with the new color engine; the app will ask you to recalibrate. Contact: soilhue@ajgb.eu — Web: ajgb.eu/apps/soilhue