The best replacement for garmin connect is strava.

The best alternatives to garmin connect are rated as following:
★★★★★  strava
★★★★★  garmin training center
★★★  runkeeper
★★★  garmin fit
★★  garmin express
★★  trainingpeaks
★★  nike plus
★★  polar personal trainer
★  movescount
★  training peaks
★  endomondo
★  mapmyride
★  training centre
★  ridewithgps
★  training center
★  sporttracks

Your alternative for garmin connect is not listed? Suggest!
Speaking about garmin connect, one probably shouldn't forget about runkeeper.

Other search terms related to garmin connect and their ratings are:
★★★★★ runkeeper
★ endomondo
You have in mind a companion for garmin connect and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of garmin connect in all years. Click on graph for more.
garmin connect
strava
garmin training center