So, I'm a happy Libra user, for weight trend tracking. In maintenance, because I tend to eat very unevenly, I get a lot of meaningless fluctuations, so I changed the advanced settings to use longer time horizons for smoothing & forecasts (30d smoothing, 60d forecast, as compared with 7d default values for both, for the tech/stats geeks out there).
Just recently, I decided I should buckle down a bit, and be consistent with a tiny deficit, to start slowly dropping some Winter/holidays weight.
This made me chuckle (note the purple circle/arrow near the lower right):
So touched that the app thinks a 63 y/o li'l ol' lady's gonna live another 10,000+ years.
FWIW, if I switch back to the 7-day default, it predicts goal achievement at June 3, 2019 . . . maybe food for thought for anyone who thinks these apps are a technological crystal ball.
Just a more statistically sophisticated version of MFP's "In 5 weeks . . . " thingie, really.