Do I need an account to use the Sport App? May 12, 2020 19:30 Updated Yes, you must log on to unlock all the features and get the most out of your 4iiii Products. Related articles How is Fliiiight different from the STAC Zero Trainers? I have a dual powermeter. Can I pair both sides using the 4iiii app? Can I pair my Viiiiva with the 4iiii app and a third party app (Trainer Road, Zwift, Sufferfest, etc.)? Are iOS and Android Apps supported?