This is just what the tech world needed: another Apple versus Google battle.
Originally, Google Fit was a software framework allowing app developers and hardware makers to record, log and display health-related data with as little coding as possible. But it left the developer labs at the end of 2014 and is now a fully-fledged consumer facing offering.
Apple's HealthKit, originally appearing with iOS 8, works the same way, alongside the company's standalone Health app. The tech giant duo are concentrating mainly on the framework, letting app developers and device manufacturers fill in the gaps.
But what are the differences? And is Android or iOS the best for fitness fanatics? Let us compare....
Quality of data
Google Fit is made up of three APIs: Sensors, Recording and History. These APIs are the Google-prescribed standards for getting data from physical sensors to apps and interfaces that want to use it.
The official list of data types covers activity times and types, calories burned, pedalling rate, wheel speed, distance covered, heart rate, height, weight, power generated in a workout, steps taken and elevation. There's no mention of sleep tracking in the official documentation, though apps can also create their own custom data types, so presumably it can be added.
Apple's official list of default data types is more comprehensive. It covers your gender, sleep patterns, blood type, workout duration and intensity, body temperature, heart rate, blood alcohol level, blood glucose, diet, cycling activity, walking activity and more, even how many times you've fallen over.
There are more data options to play with in HealthKit, at least in terms of preset fields for developers to plug into.
The apps and platforms
Google Fit takes the form of an Android app, optimised for both smartphones and tablets, and a web based portal, which can collect health info from a range of wearable devices. For the apps, you'll need to be running Android 4.0 or later.
Essential guide: How to use Apple Health
With Google Fit installed on your mobile device you don't actually need additional apps when it comes to the basics. It uses the sensors already built in to your Android device to automatically detect walking, cycling and running; and you can set and keep track of goals based on your activity levels.
Apple Health is built right into iOS and is described as its makers as "an easy‑to‑read dashboard of your health and ﬁtness data".
Apple's latest iPhones have motion co-processors built in that collect sensor data from the integrated accelerometers, gyroscopes and compasses, and your phone tracks this data and combines it with the info from other compatible apps.
When Google Fit was announced back in June 2014 at Google I/O, partners such as Withings, Nike, HTC, LG, Motorola, Noom, Runtastic, RunKeeper and Polar were mentioned, and they've all followed through with compatible apps and devices.
Check out our comprehensive list of Google Fit apps and devices for more details.
Apple Health, having a bit of a head-start, already has more than 100 apps that play nicely with it including the likes of Strava, Golfshot, Sleepio, Runtastic, Garmin Connect, Jawbone and Beddit.
Essential reading: Apple Watch vs Samsung Gear
We do know that Google Fit will eventually include APIs to work on the web and iOS, whereas Apple's HealthKit is firmly locked into its own software, so iOS apps can theoretically support Google Fit as well as HealthKit.
This is in line with the existing approach of both companies: you can get Gmail and Google Maps on iPhones easily enough, but you'll be a long time waiting for Apple email and maps apps on your Nexus.
When it comes to wearable devices, compatibility varies. Android Wear devices don't work with iOS and automatically plug into Google Fit; the Apple Watch of course, exclusively supports HealthKit.
As for devices manufactured independently of Apple and Google, it's likely that they'll support both platforms from now on, in the same way that most app developers cater for both iOS and Android (see Jawbone's announcement along these lines).
With Google Fit and Apple Health still in their early stages of development, we're yet to see third-party wearable devices appear that peg their colours to one mast or the other – most will continue to support both iOS and Android, and as a result HealthKit and Google Fit too.
To get a device that specifically supports one health platform or the other, choose the Apple Watch or an Android Wear gadget.
Analysis and data security
Both Google Fit and Apple HealthKit pull in your health and fitness data from multiple apps and multiple devices, making sure there are no overlaps along the way. Apps built on top of these two platforms can give you a detailed breakdown of your activities.
As the names suggest though, Apple is more comprehensive when it comes to health (from allergies to sugar levels), while Google focuses primarily on the usual fitness variables. It looks like Apple is taking a more comprehensive, detailed approach to data analysis while Google is offering a more lightweight, flexible set of tools that can be moulded as required.
Apple is keen to emphasis the privacy of your data on HealthKit. "The information you generate about yourself is yours to use and share," says the company. Data is encrypted and backed up to iCloud, and HealthKit-compatible apps are required to present their own privacy policies when installed.
Google has yet to make a definitive statement on data stored in Google Fit, though its advertising policies restrict the use of "sensitive information" in marketing activities, with health and medical records specifically mentioned.
For the time being it looks like all of the big hardware and software companies — with the exception of the Android Wear smartwatch makers — are happy to support both Google Fit and Apple Health. Key players like Jawbone and Fitbit, for example, have made noises suggesting they'll be platform agnostic. Google relies more on hardware manufacturers than Apple does, and it has an impressive list of backers on the Google Fit website: Adidas, Asus, Basis, HTC, Intel, LG, Mio, Motorola, Nike, Noom, Polar, RunKeeper, Runtastic and Withings.
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Apple has not published a similar list of partners, but showcased Nike, Fitbit, RunKeeper and Withings in its announcement keynote back in June. Where Apple has forged ahead is in partnering with electronic health record companies, including the Mayo Clinic and Epic software. Again, this confirms Apple is much more serious about health records as well as fitness tracking, an area where Google has previously tried and failed to make an impact with its Google Health initiative.
What do you think?
Have you used Apple Health or Google Fit? Let us know about your experiences using the comments below...