AliveCor Files Antitrust Suit Against Apple for Preventing Third-Party Irregular Heart Rhythm Analysis on Apple Watch

AliveCor, a company that that has developed an ECG 'KardiaBand' for the Apple Watch, today filed an antitrust lawsuit against Apple that accuses the Cupertino company of "monopolistic conduct."

Kardia Band apple watch
According to AliveCor, Apple's decision to exclude third-party heart rate analysis providers from the Apple Watch has harmed AliveCor and impacted patients and consumers. To go along with the KardiaBand, AliveCor created the SmartRhythm app, which uses data from the Apple Watch's heart rate algorithm to determine when a heart rate is irregular and suggest people take an ECG with the KardiaBand.

The KardiaBand received FDA approval in 2017, and in 2018, Apple debuted the Apple Watch Series 4 with built-in ECG capabilities and its own irregular heart rhythm notifications followed. AliveCor claims that Apple saw the success of the KardiaBand and changed the functionality of watchOS to sabotage KardiaBand and "corner the market for heart rate analysis on Apple Watch."

AliveCor claims that the SmartRhythm app was initially allowed in the App Store, but Apple later claimed that it violated ‌App Store‌ guidelines. AliveCor says that it was forced to adapt SmartRhythm multiple times to adjust to Apple's rules, and then Apple "made changes to watchOS's heart rate algorithm" to ensure that SmartRhythm and other competing apps would not work. Apple allegedly changed the heart rate algorithm in watchOS 5 to prevent third-party apps from being able to identify irregular heart rate situations.

The algorithm was virtually the same on the first four versions of watchOS, but, with the introduction of the Series 4 Apple Watch and Apple's introduction of its competing heartrate analysis app, Apple released watchOS5, which, among other things, "updated" the Watch's heartrate algorithm. That update did not improve the user experience for Apple Watch purchasers; instead, its purpose and effect was simply to prevent third parties from identifying irregular heartrate situations and, thus, from offering competing heartrate analysis apps.

Prior to Apple's alleged sabotage, AliveCor says that its SmartRhythm app was "simply better at identifying worrisome heart-related health events," and could have successfully competed with the ECG function built into the Apple watch. AliveCor was forced to pull SmartRhythm from the ‌App Store‌ because the irregular rhythm functionality no longer worked.

All of this has been devastating to competition, as Apple today commands 100% share of heartrate analysis apps on watchOS devices and, if viewed in the alternative as part of either the U.S. ECG-capable smartwatch or U.S. ECG-capable wearable devices market, over 70% market share. With a single update, Apple thus eliminated competition that consumers clearly wanted and needed, depriving them of choice for heartrate analysis that is better than what Apple can provide.

AliveCor has previously filed several patent infringement lawsuits against Apple, alleging that Apple copied AliveCor's cardiological detection and analysis technology. Those lawsuits have not yet been resolved, and with today's antitrust suit, AliveCor is seeking damages and an injunction that would require Apple to "cease its abusive conduct."

This is just one of several antitrust battles that Apple is facing. A high-profile lawsuit brought by Epic Games wrapped up earlier this week, and there are also antitrust investigations into Apple's ‌App Store‌ fees in the UK and in the United States, among other countries.

Popular Stories

iOS 26 Feature

iOS 26.1 to iOS 26.4 Will Add These New Features to Your iPhone

Saturday October 18, 2025 11:00 am PDT by
iOS 26 was released last month, but the software train never stops, and iOS 26.1 beta testing is already underway. So far, iOS 26.1 makes both Apple Intelligence and Live Translation on compatible AirPods available in additional languages, and it includes some other minor changes across the Apple Music, Calendar, Photos, Clock, and Safari apps. More features and changes will follow in future ...
ios 26 1 liquid glass opaque

iOS 26.1 Beta 4 Lets Users Control Liquid Glass Transparency with New Toggle

Monday October 20, 2025 10:57 am PDT by
With the fourth betas of iOS 26.1, iPadOS 26.1, and macOS 26.1, Apple has introduced a new setting that's designed to allow users to customize the look of Liquid Glass. The toggle lets users select from a clear look for Liquid Glass, or a tinted look. Clear is the current Liquid Glass design, which is more transparent and shows the background underneath buttons, bars, and menus, while tinted ...
iphone air thickness

Apple Said to Cut iPhone Air Production Amid Underwhelming Sales

Friday October 17, 2025 8:29 am PDT by
Apple plans to cut production of the iPhone Air amid underwhelming sales performance, Japan's Mizuho Securities believes (via The Elec). The Japanese investment banking and securities firm claims that the iPhone 17 Pro and iPhone 17 Pro Max are seeing higher sales than their predecessors during the same period last year, while the standard iPhone 17 is a major success, performing...
iOS 26

iOS 26.0.2 Update for iPhones Coming Soon

Friday October 17, 2025 7:35 am PDT by
Apple's software engineers continue to internally test iOS 26.0.2, according to MacRumors logs, which have been a reliable indicator of upcoming iOS versions. iOS 26.0.2 will be a minor update that addresses bugs and/or security vulnerabilities, but we do not know any specific details yet. The update will likely be released by the end of next week. Last month, Apple released iOS 26.0.1,...
Apple iPad Pro hero M5

New iPad Pro Has Six Key Upgrades Beyond M5 Chip

Saturday October 18, 2025 10:57 am PDT by
While the new iPad Pro's headline feature is the M5 chip, the device has some other changes, including N1 and C1X chips, faster storage speeds, and more. With the M5 chip, the new iPad Pro has up to a 20% faster CPU and up to a 40% faster GPU compared to the previous model with the M4 chip, according to Geekbench 6 results. Keep in mind that 256GB and 512GB configurations have a 9-core CPU,...
iPhone Siri Glow

Some Apple Employees Have 'Concerns' About iOS 26.4's Revamped Siri

Sunday October 19, 2025 7:39 am PDT by
iOS 26.4 is expected to introduce a revamped version of Siri powered by Apple Intelligence, but not everyone is satisfied with how well it works. In his Power On newsletter today, Bloomberg's Mark Gurman said some of Apple's software engineers have "concerns" about the overhauled Siri's performance. However, he did not provide any specific details about the shortcomings. iOS 26.4 will...
HomePod mini and Apple TV

Apple's Next Rumored Products: New HomePod Mini, Apple TV, and More

Thursday October 16, 2025 9:13 am PDT by
Apple on Wednesday updated the 14-inch MacBook Pro, iPad Pro, and Vision Pro with its next-generation M5 chip, but previous rumors have indicated that the company still plans to announce at least a few additional products before the end of the year. The following Apple products have at one point been rumored to be updated in 2025, although it is unclear if the timeframe for any of them has...
m4 macbook air blue

M5 MacBook Air Coming Spring 2026 With M5 Mac Studio and Mac Mini in Development

Thursday October 16, 2025 3:57 pm PDT by
Apple plans to launch MacBook Air models equipped with the new M5 chip in spring 2026, according to Bloomberg's Mark Gurman. Apple is also working on M5 Pro and M5 Max MacBook Pro models that will come early in the year. Neither the MacBook Pro models nor the MacBook Air models are expected to get design changes, with Apple focusing on simple chip upgrades. In the case of the MacBook Pro, a m...
maxresdefault

Here's How the iOS 26.1 Transparency Toggle Changes Liquid Glass

Monday October 20, 2025 1:55 pm PDT by
With the fourth beta of iOS 26.1, Apple added a toggle that makes Liquid Glass more opaque and reduces transparency. We tested the beta to see where the toggle works and what it looks like. Subscribe to the MacRumors YouTube channel for more videos. If you have the latest iOS 26.1 beta, you can go to Settings > Display and Brightness to get to the new option. Tap on Liquid Glass, then...

Top Rated Comments

thisisnotmyname Avatar
58 months ago

Send your complaint to the FDA.
They did get FDA approval per the article but their complaint is that they are dependent upon Apple devices to trigger their own device's operation and Apple has changes its API so they can no longer trigger that process. If I were making a medical device that was dependent on Siemens imaging equipment to trigger my operation I wouldn't be at all surprised if Siemens unilaterally changed their interfaces either. That would have been a risk I took on by making my device dependent upon another manufacturer without contractual agreements in place to support said interface. They're taking a shot in the courts but it won't work out in their favor.

edit: typo
Score: 44 Votes (Like | Disagree)
calikid78 Avatar
58 months ago
It's nuts. You build your own platform, O/S and now you get sued because you won't give everyone access to your proprietary, hard work. Sounds like all these idiots should go invent their own tech and O/S and stop complaining about Apple's.
Score: 39 Votes (Like | Disagree)
nattK Avatar
58 months ago
Is suing Apple a trendy thing right now? It feels like everyone and their grandmother are out suing Apple nowadays.
Score: 37 Votes (Like | Disagree)
Mebsat Avatar
58 months ago
So Apple is using its monopoly power to dominate the Apple Watch ECG market?
Score: 37 Votes (Like | Disagree)
WiseAJ Avatar
58 months ago
Yeah Apple clearly copied them, because it's not like they were working for years on the ecg function for the Apple Watch and got it designed and FDA approved in under a year. :rolleyes:.

They need to start handing out shirts that say "I sued Apple and all I got was this T-Shirt"

This is getting ridiculous.
Score: 27 Votes (Like | Disagree)
swingerofbirch Avatar
58 months ago
What's sad is that AliveCor actually is better, too.

They've been doing this for a long time. Their a-fib detection is superior because it actually analyzes rates that are typical for a-fib, whereas Apple caps their detection to low pulse rates. AliveCor's algorithms have gotten really good and are approved for more diagnoses by the FDA than Apple's.

Tim Cook talks about reading letters of people's lives he's saved, and then they cut out a competitor that actually has a better and less expensive product. How many lives has that impacted?
Score: 22 Votes (Like | Disagree)