Beware
I asked for an estimate between Barcelona central, and the airport and was quoted €11, though warned it was an estimate.
20m later, through pretty uneventful traffic, and a route that was optimal (the driver kept to the route Google suggested), I was charged €35.
Additionally, there is no way to rate drivers so that bad driving and rude drivers can be averted.
For clarity, I used this app in Spain (which has banned Uber, apparently to support the local taxi industry for a bit longer before it inevitably changes forever).
The app seems to encourage whatever practices seem to be standard in the local taxi community. While its technically very good, I cannot trust it.
sugaraspa about
FREENOW - Mobility Super App, v6.2.1