If “seamless” means you can start on your phone, use a tablet when convenient, and reliably move to the TV without fighting compatibility, I’d rank the major connected-fitness ecosystems roughly like this:
For a tech-savvy household with mixed devices, Peloton is probably the strongest choice.
Its current app officially supports iOS and Android phones/tablets, plus Apple TV, Android TV, Roku and Fire TV, as well as web access.
That matters because you aren't really buying into a particular screen. You can use Peloton classes with your own bike, treadmill or rower, and the App+ tier supports unlimited cardio-equipment classes.
Why I rank it #1: it's the closest thing to a Netflix-like fitness service that happens to have excellent connected hardware. The TV experience is a first-class destination rather than merely a phone screen being mirrored.
Best if: you have iPhone + Android devices in the household, multiple TV platforms, or want the freedom to change equipment later.
🥈 Apple Fitness+ — the smoothest experience inside Apple
If your household is predominantly iPhone + iPad + Apple Watch + Apple TV, Apple Fitness+ arguably feels even more seamless than Peloton.
Apple supports Fitness+ directly on iPhone, iPad and Apple TV, and current Apple support also allows workouts to be streamed via AirPlay to compatible TVs.
The killer feature is integration: Apple Watch and supported heart-rate devices can put live metrics directly into the workout experience. Current Fitness+ also supports metrics from AirPods Pro 3, Powerbeats Pro 2 and compatible Bluetooth heart-rate monitors.
The catch is ecosystem lock-in. Android isn't part of the native experience, so the same thing that makes Fitness+ wonderfully cohesive in an Apple household makes it considerably less attractive in a mixed-device household.
Best if: your tech ecosystem already revolves around Apple.
🥉 iFIT — excellent if the hardware is part of the plan
iFIT is particularly compelling if you're buying a NordicTrack/ProForm/Freemotion treadmill, bike or other compatible equipment.
Its lighter iFIT Train membership runs on phones/tablets and can pair with Bluetooth-compatible equipment, while iFIT Pro is designed around equipment with integrated touchscreens.
The platform's standout is the combination of 10,000+ workouts, outdoor/scenic training and hardware integration.
I'd put it behind Peloton for pure device-to-device app elegance, though. iFIT's greatest strength is really the marriage of software with compatible fitness equipment rather than being the best standalone multi-TV app ecosystem.
Best if: you're buying a connected treadmill/bike and want the software to control the experience.
4. Echelon — surprisingly flexible, but less polished
Echelon supports iOS and Android and lets the same account work across devices. Its ecosystem supports TV viewing through Chromecast/AirPlay, and newer Echelon equipment running FitOS can also provide entertainment apps directly on the machine.
The weakness is that its TV experience historically relies more on web login, casting or mirroring than Peloton's dedicated TV-app approach. Echelon itself recommends Apple TV or screen mirroring for displaying workout stats on a TV.
So it's flexible, but the number of little workarounds is higher.
Tonal is almost the inverse of Peloton: its hardware experience is extremely integrated, but the companion-app ecosystem isn't as broad.
The current Tonal app is primarily positioned around iPhone and Apple Watch, with workouts and programs available away from the machine.
If your priority is “I want an incredible strength machine that also has an app”, Tonal is compelling. If your priority is “I want to choose between phone, iPad, Android tablet, Roku TV and Apple TV”, Peloton wins comfortably.
My recommendation
For maximum device freedom:Peloton
For the most frictionless Apple experience:Apple Fitness+
For treadmill/bike training with immersive outdoor content:iFIT
For lower-cost hardware and flexibility:Echelon
For serious connected strength training:Tonal
The interesting distinction is that Peloton is currently the best platform-first ecosystem, whereas Apple is the best device-ecosystem-first experience. Peloton's official app spans phone, tablet, web and several major TV platforms, while Apple achieves its smoothness by controlling the operating system, hardware and health-data stack.
If I were choosing specifically for a tech-savvy household that owns a mix of iPhone/Android, iPad/tablets and smart TVs, I'd take Peloton. If everyone uses Apple, I'd take Fitness+.
Apple Fitness+ and Peloton offer the most seamless multi-device fitness experiences, with Apple leading in biometric integration and Peloton leading in cross-platform hardware versatility.
Apple Fitness+
The Experience : Best for deep Apple ecosystem integration. It dynamically overlays real-time metrics (heart rate, calories, activity rings) from your Apple Watch directly onto your iPhone, iPad, or Apple TV screen.
The Tech Touch : Handoff and continuity are frictionless. Starting a workout on an Apple TV automatically prompts your watch, and pausing or finishing syncs instantly across devices via iCloud.
The Catch : You must be fully invested in the iOS/watchOS ecosystem. It does not natively support Android devices or non-Apple smart TV casting apps without AirPlay.
Peloton App
The Experience : Best for mixed-device or hardware-agnostic households. It runs natively and robustly across iOS, Android, Fire TV, Roku, and major smart TV interfaces.
The Tech Touch : The interface layout cleanly scales from a mobile screen to a tablet or 4K TV. Account progress, metrics history, and music preferences sync instantly across platforms via Peloton's cloud.
The Catch : While the video and class syncing are smooth, it lacks the direct, real-time biometric onscreen metric overlay for third-party wearables on your TV unless you are connected to official Peloton hardware.
Garmin Connect / Strava
The Experience : Best for data-heavy, outdoor, and metric-obsessed athletes . While they are less focused on "follow-along TV classes," their ecosystem syncing across phone and tablet dashboard apps is instantaneous.
The Tech Touch : Unmatched depth in post-workout analytics, training readiness scores, and API integrations with third-party cycling/running apps.
The Catch : Not designed as a living-room TV workout entertainment platform, meaning the large-screen experience is virtually non-existent compared to Peloton or Apple.
If you share what specific wearables (such as an Apple Watch, Garmin, or Galaxy Watch) and TV streaming devices (like Apple TV, Fire TV, or Google TV) you use, I can help you choose the option with the least amount of syncing friction.