I posted earlier about decimal time iPhone apps. I had also searched for an app for the French republican/revolutionary calendar, as the calendar was tied together with decimal time. I even searched the French word "calendrier", but did not find one. This calendar was used from 1793 to 1805, and replaced the 7-day week with the 10-day décade, with exactly three décades (i.e. 30 days) a month and five or six extra days at the end of the year, which began on the autumnal equinox in September.
Well, now there is an app for that, too, released December 20 (MJD 55185). It's called Calendrier- French Revolution Calendar by Kawasemi Corp. (José Luis Martín Mas) and costs $1.99.
I thought that name was familiar; he's the same one who made the Mac Dashboard widget, with whom I've communicated before. As I remember, instead of the years always starting on the equinox, he uses an odd rule that every fourth year be a leap year, except for years divisible by 128. That means that in this app the current year CCXVIII (218) started on 2009 Sept. 23 (55097) even though the equinox was on Sept. 22 (55096). However, the next autumnal equinox is on Sept. 23, so the two versions will coincide the next republican year, although some use yet a different version, with a leap year rule similar to the Gregorian calendar, that starts on Sept. 22. BTW, today's French republican date would be 13 Nivôse CCXVIII, Tridi, Décade 2, according to the app, or Quartidi, 14 Nivôse, according to the other versions.
It also displays the decimal time, like the other apps, although digital only. That makes a total of four apps which display French decimal time.
Quartidi 14 Nivôse an CCXVIII à 6h6 t.m.P.