Numerare vs Periora

Have you ever struggled to decipher the date inscribed on a monument in Roman numerals? Or know how to write a number in Roman numerals? Hear how these numbers were pronounced? Would you like to learn how to calculate with an abacus like the ancient Romans? In any case, Numerare allows you to do so in a simple, fun, and educational way. Numerare allows you to read numbers in Roman numerals and convert them to conventional numbers, up to numbers of 40 million. The entry is facilitated by a keyboard in Roman numerals and verified on the fly. Conversely, enter a number to find out how it is written in Roman numerals and how to speak the number in Latin. You can read inscriptions of Roman numerals with the camera or draw on screen to instantly translate it into a number. With the animated help module, learn to calculate addition and subtraction with abacuses. Have the messages and Roman numerals read for ease of use. Numerare can be displayed in English, French, Italian, Spanish, German, Greek, Portuguese and even Latin for enthusiasts. Practice reading or writing Roman numerals by playing. Find 5 or 10 numbers with increasing levels of difficulty and beat your time record. Like a hurdle race. Play with others to compete for the title of champion. Works on iOS 15.6 and above as well as on Mac Supports dark mode.

Periora is the periodic table you'll actually enjoy opening. Every one of the 118 elements, with data compiled from IUPAC and NIST — atomic weights, electron configurations, physical properties — bundled offline, so it works in class, in the lab, or on a plane. No account. No ads. Ever. BUILT FOR STUDY • Quiz mode: Symbol → Name and Name → Symbol with instant feedback • Search that understands Arabic and English — حديد, Iron, Fe, or 26 all find the same element • Category filters: pick out the halogens or lanthanides at a glance BEAUTIFUL AND ALIVE • Animated electron shells for every element • A true iPad layout: the whole table at a glance • Full dark mode and a design that respects your language — complete right-to-left Arabic ACCURATE BY DESIGN • Values from IUPAC (2021 standard atomic weights) and NIST • Every property traceable to its source PERIORA PRO (optional one-time purchase) • Unlimited quiz sessions — the reference itself is free, forever • No subscription, ever Made for students, teachers, and the chemistry-curious.