'World's First Swim App' on Apple Watch Put to the Test in New Video

In the days and weeks after its launch last April, one of the biggest curiosities surrounding the Apple Watch was its tolerance to water. Thanks to a few initial tests -- from showers to high dive pools -- we now know that the Apple Watch is indeed a bit more waterproof than Apple promises, and with that in mind a few London-based iOS developers have created the "World's first swim app on the Apple Watch," and put it through its paces in a new video.

static1.squarespace.com
Having designed a similar app for the Pebble, Ted Bradley and his team decided to take that idea -- a lapping, time, and heart rate monitoring swim app -- and transplant it onto the Apple Watch. The developers put each smartwatch to the same test, swimming four full lengths of the London Aquatic Centre's 50 meter pool. The test proved successful, with the Apple Watch mirroring the Pebble's results of a four lap, 200 meter swim. Apple's smartwatch even continued to measure heart rate successfully, raising from an initial 88bpm to 138bpm immediately after the test finished.

The only downside for the app is that the Apple Watch experiences a tiny bit of lag when waking it up to check out lap times, the developers explaining that only when the screen is awake can the app run through the data samples collected from the swim and take a few seconds to parse through the information and display it on screen. Elsewhere, the swimming data isn't locked into the app, all of the workout and heart rate information getting delivered to HealthKit like any other workout and adding to a user's daily exercise and move goals.


Of course, even though the app works, the developers are still referring to it as an "interesting technology demo," seeing that App Store Guidelines will immediately shut it down for encouraging users to use the Watch "in a way that may cause damage to the device." In the end, the app's creators just hope that Apple hears the calls for a fully-waterproof smartwatch and includes such features in the device's next generation.

We really hope that Apple see the demand for an official, fully waterproofed Apple Watch. Once that is available, we’ll be able to ship a fully featured swimming app. In the mean time, it would be great to see swimming become a first class citizen in the Apple Health and Activities apps. Running and cycling both have their own distance graphs you can view in the dashboard whilst for swimming you have to drill down to individual workouts.

Although you can’t swim with the Apple Watch, many people swim with other devices as well as logging their swim workouts manually on other apps. If there is a future ambition for Apple Health/HealthKit, Apple Watch, the new Activity app and ResearchKit to all tie up and tell the narrative that "Apple user's live longer healthier lives", then recording all fitness activity, including swimming, is a must.

The full blog post, where Bradley goes into detail about everything from his inspiration for creating the swim app to architectural challenges the team faced in creating it, is definitely worth a read.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iPhone Pocket Short

iPhone Pocket is Now Completely Sold Out Worldwide

Tuesday November 25, 2025 7:16 am PST by
Apple recently teamed up with Japanese fashion brand ISSEY MIYAKE to create the iPhone Pocket, a limited-edition knitted accessory designed to carry an iPhone. However, it is now completely sold out in all countries where it was released. iPhone Pocket became available to order on Apple's online store starting Friday, November 14, in the United States, France, China, Italy, Japan, Singapore, ...
Netflix Smaller 4

Netflix Kills Casting From Its Mobile App to Most Modern TVs

Monday December 1, 2025 4:36 am PST by
Netflix has quietly removed the ability to cast content from its mobile apps to most modern TVs and streaming devices, including newer Chromecast models and the Google TV Streamer. The change was first spotted by users on Reddit and confirmed in an updated Netflix support page (via Android Authority), which now states that the streaming service no longer supports casting from mobile devices...
Cyber Week Deals 2025

Best Cyber Week Apple Deals Include Big Discounts on AirPods, Apple Watch, and More

Sunday November 30, 2025 7:33 am PST by
Cyber Week is here, and you can find popular Apple products like AirPods, iPad, Apple Watch, and more at all-time low prices. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running. Specifically,...
Sad Siri Feature

Apple AI Chief John Giannandrea Retiring After Siri Delays

Monday December 1, 2025 2:16 pm PST by
Apple AI chief John Giannandrea is stepping down from his position and retiring in spring 2026, Apple announced today. Giannandrea will serve as an advisor between now and 2026, with former Microsoft AI researcher Amar Subramanya set to take over as vice president of AI. Subramanya will report to Apple engineering chief Craig Federighi, and will lead Apple Foundation Models, ML research, and ...
studio display purple february

M5 iPad Pro Could Hint at New Studio Display Feature

Sunday November 30, 2025 10:30 am PST by
The updated specs of the M5 iPad Pro may point toward a major new feature for Apple's next-generation Studio Display expected in early 2026. Apple's latest iPad Pro debuted last month and contains one display-related change that stands out: it can now drive external monitors at up to 120Hz with Adaptive Sync. The feature should deliver lower latency, smoother motion, and fewer visual...
New Intel Logo

Apple and Intel Rumored to Partner on Mac Chips Again in a New Way

Friday November 28, 2025 7:33 am PST by
While all Macs are now powered by Apple's custom-designed chips, a new rumor claims that Apple may rekindle its partnership with Intel, albeit in a new and limited way. Apple supply chain analyst Ming-Chi Kuo today said Intel is expected to begin shipping Apple's lowest-end M-series chip as early as mid-2027. Kuo said Apple plans to utilize Intel's 18A process, which is the "earliest...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
iphone black friday gold

The Best Black Friday iPhone Deals Still Available

Friday November 28, 2025 6:24 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2025 sales have kicked off at AT&T, Verizon, T-Mobile, and more. Right now we're tracking notable offers on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air. For even more savings, keep an eye on older models during the holiday shopping season. Note: MacRumors is...
iOS 26

When Will Apple Release iOS 26.2?

Monday December 1, 2025 4:37 pm PST by
We're getting closer to the launch of the final major iOS update of the year, with Apple set to release iOS 26.2 in December. We've had three betas so far and are expecting a fourth beta or a release candidate this week, so a launch could follow as soon as next week. Past Launch Dates Apple's past iOS x.2 updates from the last few years have all happened right around the middle of the...

Top Rated Comments

73b Avatar
136 months ago
My only complaint I have about the Apple Watch is that the sport model is not really durable enough for a lot of sports. I'm nervous to wear my watch to the beach or during any sport where I might be hitting the ground too hard. Of course, I can't take it swimming either. Apple could design a much more durable watch that is completely waterproof and still looks good. I don't know why "sport" for them just means cheaper and lighter.
Score: 11 Votes (Like | Disagree)
Quu Avatar
136 months ago
I don't know why Apple didn't fully waterproof the Watch. Perhaps at least the sport version. It seems that it's pretty much waterproof anyway… add a couple gaskets and go for full waterproofing already.
I think it's clear that the watch is waterproof but Apple didn't want to have it fail and have to refund people or have a lawsuit or class action if it wasn't durable enough to stay waterproof over the life of the watch.

I would expect the 2nd or 3rd Apple Watch to be advertised as waterproof once they have more data about the durability of the water seals.
Score: 9 Votes (Like | Disagree)
AngerDanger Avatar
136 months ago
the developers explaining that only when the screen is awake can the app run through the data samples collected from the swim and take a few seconds to parse through the information and display it on screen.
Ah, there's nothing like developing within limitations to really hone one's skills. It's the programming equivalent of high-altitude training.
Score: 6 Votes (Like | Disagree)
DTphonehome Avatar
136 months ago
I don't know why Apple didn't fully waterproof the Watch. Perhaps at least the sport version. It seems that it's pretty much waterproof anyway… add a couple gaskets and go for full waterproofing already.
Score: 4 Votes (Like | Disagree)
Lazrhog Avatar
136 months ago
They just need to be creative in the app description. It can be used to measure the number of widths of a football pitch you can run whilst flailing your arms windmill-style !

Call it Windy-Widths :)
Score: 3 Votes (Like | Disagree)
WatchSwimmer Avatar
136 months ago
Do you know of any links/blogs where people have been tracking similar usage, over time? I'd be very interested to get beyond these abstract debates and read more about real world experience. Plus, a big question: Anyone heard of any reports of a watch actually breaking from swimming?!!
We're going to swim the distance of the English Channel (41km) with our Apple Watch. Follow us at https://twitter.com/WatchSwimmer

We'll upload a map each time we've done a swim so you can follow the progress, along with any damage reports, videos/photos and hopefully some more updates on the progress of our Unreleasable Apple Watch Swim app!

Any suggestions, let us know.

If there is anyone in the London area capable of dissecting the Apple Watch to inspect for damage once we've completed/failed please get in touch.
Score: 2 Votes (Like | Disagree)