Stopped working one week after return window. Replaced battery. Clip would not press on as in video. Husband and daughter tried unsuccessfully. Repeatedly emailed and called company, no response. Fi... See more
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See what reviewers are saying
I had this Kardia Card for a little more than a year and using on my Samsung S20+. I complained almost a year ago that it gives me "UNCLASSIFIED" result almost 95% of the time. I lived with that any... See more
Company replied
I was having trouble with password reset on the Kardia ap so that I could use my Kardia Mobile card that I recently purchased. I called Kardia customer support on a Saturday morning and got a call re... See more
Company replied
Bought the kardiamobile 6l from amazon. You have to agree to multiple creepy personal data sharing statements, have to agree to phone contact sharing then location on at all times + other weird and co... See more
Company details
Information provided by various external sources
AliveCor is a medical device and artificial intelligence company that sells ECG hardware and software for consumer mobile devices.
Contact info
Maiden Lane 30, 94108, San Francisco, United States
- alivecor.com
1.9
Poor
90 reviews
Replied to 100% of negative reviews
Typically takes over 1 month to reply
How this company uses Trustpilot
See how their reviews and ratings are sourced, scored, and moderated.
Stopped working one week after return…
Stopped working one week after return window. Replaced battery. Clip would not press on as in video. Husband and daughter tried unsuccessfully. Repeatedly emailed and called company, no response. Finally got a message from them asking to send my phone number but they never called. Then they asked for my email address - (again) but never got an email. Utter crap. Beware.
18 March 2026
Unprompted review
Reply from AliveCor
Hello,
We apologize for the frustration with your KardiaMobile device. Our team has replied directly to your email, most recently on Tuesday the 14th, with instructions to help fix your battery cover, but we have not received a response.
Please check your spam or junk folders in case our messages were routed there. We still want to help you get your device working, so please reply to our email thread so we can get this resolved for you!
Best regards,
AliveCor Customer Care
Definitely not for Consumers
I had this Kardia Card for a little more than a year and using on my Samsung S20+.
I complained almost a year ago that it gives me "UNCLASSIFIED" result almost 95% of the time.
I lived with that anyway, and in April 2026 I trades my S20+ to S26+. and I cannot connect with my Kardia card. They told me that it is not compatible and suggested to go back to S20+ ??.
6 April 2026
Unprompted review
Reply from AliveCor
We sincerely apologize for the frustration you’ve experienced with your "Unclassified" readings and the connectivity issues with your new phone. We understand that suggesting you return to an older model is not a practical solution.
Because the Samsung S26+ was just released in March 2026, our team has not yet had the ability to add the new Samsung Galaxy models to our compatibility list, as we have not yet completed the rigorous testing required for a regulated medical device. We are working diligently on this and hope this new model will be added in the near future.
12L: not a replacement
Professional user of Kardia 12L.
1) Requires a password to use, even while offline
2) The "Forget Password" function doesn't work.
3) The customer service (only phone number listed) cannot reset passwords.
1 April 2026
Unprompted review
Reply from AliveCor
Thank you for your feedback, and we sincerely apologize for the frustration you’ve experienced trying to access your Kardia 12L. We know how critical seamless access is for our professional users, and we want to get this resolved for you right away.
Our team actually reached out and left a voicemail for you yesterday to help troubleshoot your 12L login issues. To address the specific concerns in your review:
Customer Service & Password Reset: It looks like the number you previously called was our consumer support line, which unfortunately does not have the tools to reset professional accounts. As a clinical user, you have a dedicated support team. Please give our clinical team a call directly at (844) 620-1060, and they will be able to assist you with the "Forgot Password" function and get your password reset.
Offline Login Requirements: We also want to assure you that having to log in constantly is not the intended experience. Once our team helps you successfully log in to the KardiaStation app, the system will securely remember your credentials, and you will not have to log in each time you use the device.
Please return our call at (844) 620-1060 at your earliest convenience so we can restore your access and ensure the app is functioning properly for you.
I was having trouble with password…
I was having trouble with password reset on the Kardia ap so that I could use my Kardia Mobile card that I recently purchased. I called Kardia customer support on a Saturday morning and got a call returned by Mike, who was very patient and helpful with resetting the password. The card is now working well to record ECG.
Thank you, Mike.
14 March 2026
Unprompted review
Reply from AliveCor
Thank you so much for taking the time to leave this wonderful review! We completely understand how frustrating password issues can be, especially when you are eager to start using your new device, so we are thrilled to hear that your KardiaMobile card is now working perfectly to record your ECGs.
We are incredibly proud of our support team, and we are so glad that Mike was able to assist you with patience and care on a Saturday morning. We will be sure to pass your kind words directly along to him—it will definitely make his day!
If you ever need assistance again in the future, please don't hesitate to reach out. We are always here to help.
Stay away of this company
Stay away of this company
Stay away of this company! Their products are expensive but worth nothing. The readings are terrible off and my cardiologist told me he couldn’t do anything with it’s readings. Also it sets false alarm by taking (AI) conclusions which aren’t true. Also it only detects certain cardiac arrhythmias when you pay (big!) so I think that’s totally irresponsible. If you send a reading for judgement you get only a report which they tell you has been reviewed by a doctor but doesn’t say anything but what the app already told you. I really think it’s a scam! When you contact support it takes weeks for them to reply with a standard answer not helping at all. I have so many regrets buying this device (KardiaMobile 6L) I hope the reviews warns future buyers.
4 February 2026
Unprompted review
Reply from AliveCor
We are very sorry to hear about your frustrating experience with your KardiaMobile 6L and our customer support team. We understand how important accurate and timely cardiac information is, and we want to address your concerns directly.
First, we apologize for the unacceptable delay in hearing back from our support team. We always aim to provide prompt assistance, and we are sorry we fell short here.
Regarding the device itself, please know that the KardiaMobile 6L is an FDA-cleared, clinically validated medical device. If your cardiologist was unable to use the readings, it may be due to electrical interference or skin contact issues affecting the tracing quality, which our team can absolutely help you troubleshoot to ensure you get a clean, readable EKG.
We also want to clarify how our features work. The core, FDA-cleared determinations—Atrial Fibrillation, Bradycardia, Tachycardia, and Normal Sinus Rhythm—are completely free and do not require a subscription. Our AI is designed to flag these potential rhythms to assist you, though it does not replace a doctor's diagnosis. The KardiaCare subscription is an optional service that unlocks extra, advanced determinations (like PVCs or PACs). When you use the clinician review feature, a board-certified doctor provides a standardized, human verification of your EKG; often, this confirms the app's initial AI finding, which is why the final report may align with what the app already told you.
We want to make this right and ensure you are getting the value out of your device. Please call our support team directly at 855-338-8800 so a specialist can look into your account, troubleshoot your tracing quality, and properly assist you.
I purchased Kardia 6L because I…
I purchased Kardia 6L because I developed A-Fib, my doctor recommended the device. It worked fine for 13-14 months. I started having the following issues: it would stop working before completing a cycle; it would register electrical interference'; it even registered I was in rhythm when I was in AFib. I contacted Kardia, they told me what to try nothing worked. I contacted the electric company to come out and check for interference, they found nothing. I contacted Kardia again 3 times, I'm still waiting on a reply. It's very disappointing that they don't stand behind their product given the nature of the illness. Actual purchase 09/2024. The calendar below would not allow that date. An item should work effectively longer than a year. I'm writing this on behalf of my husband.
1 January 2026
Unprompted review
Reply from AliveCor
We sincerely apologize for the delay in our response; we have been experiencing a very high ticket volume due to the holiday season. The issues your husband is seeing around the 13-to-14-month mark—like stopping mid-cycle and sudden interference—are very frequently caused by a depleted battery. Replacing the standard CR2016 coin cell battery often resolves these glitches immediately, even if the app hasn't warned you yet. Please call our team directly at 855-338-8800 so we can assist you with a battery change, or evaluate the device for a replacement if needed. We are committed to making this right!
Excellent product for SVTs
Amazing product. Always works and registers arythmias accurately. Saved me wearing a heart monitor. It recorded several SVTs and I gave them to my cardiologist who performed a successful ablation. Completely disagree with negative views. Have recommended the Kardia monitor to many.
11 November 2025
Unprompted review
Reply from AliveCor
Thank you so much for sharing your incredible story! We are absolutely thrilled to hear that your Kardia device helped capture your SVTs and contributed to a successful ablation with your cardiologist. Hearing that our product played a positive role in your treatment and recovery is the highest compliment we could ask for. Thank you for your strong recommendation and for trusting us with your heart health!
KardiaMobile 6L
This is a review for the KardiaMobile 6L personal EKG. When I first got it, it was a lifesaver. But within a few months it started being difficult to connect and stay connected. I reached out to support, and did everything they told me to do, but to no avail. They finally sent me a new one (and make me pay $25). It worked fine for a few weeks and now I'm back to the same issues. I can't get it to connect, can't get it to stay connected and rarely am able to complete a reading. By the time I do, my pulse is so high because I'm so mad! I've reached out to support and they just keep telling me to redownload the app. I have redownloaded the app multiple times, change the batteries, all to no avail. It takes forever to get a reading. It either doesn't connect or won't stay connected 75% of the time. They need to get this worked out!
14 October 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for the ongoing connection issues. Since you are experiencing this with a second device after multiple troubleshooting attempts, the root cause is highly likely related to your smartphone's Bluetooth connection or settings, rather than the KardiaMobile itself.
We want to get this permanently resolved for you. Please call our consumer support team directly at 855-338-8800.
Chaotic and misleading warranty service for a medical device
I trusted AliveCor because this is a medical product, but their India warranty service has been chaotic.
I was first told I’d need to pay for return shipping. Then, after pointing to their own policy, they switched stories and sent a courier with no scheduling or notice — my building told me someone had shown up, and I got more than 12 calls while working.
They told me a replacement was shipped, but the tracking didn’t work. Then they claimed it was canceled because I’d requested a refund — which isn’t true.
I’ve never experienced such an unprofessional, inconsistent process for a medical device. I’ve documented everything and escalated it to AliveCor global and consumer protection authorities in India.
If you’re considering purchasing, be aware the after-sales service is unreliable at best. And the product in my case didn't even work.
9 October 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for the unacceptable delays and miscommunications regarding your warranty replacement in India. The confusing experience you had with courier scheduling, return shipping, and conflicting tracking information does not reflect the standard of support we strive to provide.
This turns out to be a scam
This turns out to be a scam, I paid an annual subscription of $99 and now the app no longer works and support doesn't respond to emails or to the open ticket. I will have to report the scam to get the money back on my card
7 September 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for the delay in responding to your ticket and the issues you are experiencing with the app. We understand your frustration, but please be assured this is not a scam; we want to ensure you have full access to the subscription you paid for.
Please call our consumer support team directly at 855-338-8800 and reference your open ticket number. We will immediately look into your account, resolve the app issue, and make sure everything is working properly for you again.
AliveCor KardiaMobile 6-lead ECG monitor
Alivecor UK sent my device by the next day in May 2025. As it turns out, this little 6 lead this week September 2025 has probably prevented me from having a second heart attack.
Although the device can’t detect a heart attack, after three days of central chest pain (thought it was stress and indigestion) I took a recording. My ECG had completely changed - I had inverted T waves and multiple PVC’s. I looked on line and this suggested death f the cardiac tissue - myocardial infarction/heart attack. I went to A&E. Although my tracing initially seemed to be normal, my blood tests showed huge increase in cardiac enzymes-a tell tale sign of attack.
So I’m in hospital now awaiting angiogram and probable stent insertion.
The A&E Dr told me it was useless and a waste of time because it “couldn’t diagnose an MI”. But it did - it showed me a completely abnormal ECG, nothing like it had recorded before. Just thinking I had had very bad indigestion and been a bit sweaty for three days wouldn’t have sent me to the emergency department to wait for hours.
This little device may well have saved my life, but because I am now under cardiology, hopefully my treatment will give me many more heart attack free years.
1 September 2025
Unprompted review
Reply from AliveCor
Thank you for sharing such a powerful story. We are incredibly relieved to hear that you are okay and receiving the cardiology care you need. While it is true that our devices cannot diagnose a heart attack, we are absolutely thrilled that the KardiaMobile 6L empowered you to recognize those abnormal changes and seek emergency treatment when you did. Stories like yours are exactly why we do what we do. We are wishing you a very smooth recovery and many healthy years ahead!
Reply from AliveCor
We sincerely apologize for your disappointing experience with both our device and our support team. We would appreciate the opportunity to make things right. Please call our consumer support team directly at 855-338-8800 so we can immediately address your concerns and help get your device working properly.
Disappointing
I hope this company succeeds. It's a good product. But, the customer service is poor. I had my 'subscription' renewed automatically, without a courtesy email...presumably from fear that I would unsubscribe. I would have renewed my subscription but, now, I'm a little less trusting and less loyal. Also, the social media monitoring on Trustpilot and similar is shockingly bad. I hope they employ some competent marketing people before it's too late.
17 July 2025
Unprompted review
Reply from AliveCor
Thank you for your kind words about our product and for your candid feedback. We sincerely apologize for the frustration caused by the automatic subscription renewal and the lack of a courtesy reminder email. We also take your comments regarding our customer service and social media presence very seriously, and we are actively working to improve our responsiveness across all platforms.
If you would like assistance reviewing your subscription or requesting a refund for the renewal, please call our consumer support team directly at 855-338-8800. We would love the opportunity to regain your trust.
Alivecor does not provide promised services
Alivecor doesn't provide satisfactory customer service. Numerous times over many months they failed to establish data transmission of my readings to the doctor's office. They repeatedly assured me that they understood my issues and that the connection failure would be resolved. What was stated, though, proved to be lipservice. Following an attempt to seek BBB advocacy, Alivecor instead, simply canceled my subscription with no apparent attempt to correct the issue. This experience with AliveCor been very disappointing and provided no meaningful benefits to my healthcare or wellbeing. DON'T BUY OR TRUST KARDIA AND ALIVECOR!
14 July 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for the frustration and delays you experienced while trying to establish data transmission with your doctor's office. To make this right, we have fully refunded you for the price of the connection and provided a new replacement code so you can successfully connect your account to your physician's practice. If you need any assistance applying this code or have any further questions, please call our consumer support team directly at 855-338-8800.
Accurately picked up Afib episodes subsequently confirmed by cardiologist
Following major abdominal surgery I started noticing heart palpitations and a feeling of my heart lurching. My fitbit showed my heart was racing at 150-160bpm. The practice nurse advised me to get a kardia mobile as they are approved by Nice for detecting afib and the ECGs can be emailed which is easier than trying to capture an ECG at the GP practice when it is actually happening. The Kardia Mobile picked up both "Possible Atrial Fibrillation" and "Unclassified", as well as mainly "Normal Sinus Rhythm". I sent off one of each of the abnormal readings for clinical review and they came back confirming Atrial Fibrillation and Atrial Tachycardia. This tallies with the diagnosis I subsequently received from a cardiologist after wearing a 24hr ECG monitor. Although the cardiologist also detected Atrial Flutter, but I have only sent off 2 Kardia Mobile ECGs for review. I find it very useful when my heart starts pounding to be able to confirm what is going on with the Kardia Mobile. My fitbit does not pick up any of the Afib episodes although it shows me my heart is racing. Great device for helping me detect what was going on and great service from the clinicians in getting a quick analysis.
7 July 2025
Unprompted review
Reply from AliveCor
Thank you so much for sharing your detailed experience! We are incredibly glad to hear that the KardiaMobile helped you capture your heart palpitations and assisted in confirming your AFib and Atrial Tachycardia diagnoses following your surgery. It is wonderful to know that you found the clinical review service fast and helpful, and that the device continues to provide you with peace of mind when your heart starts racing. We wish you the best in your continued recovery and management!
I returned the 6L device
I returned the 6L device, cancelled my subscription (I thought) and never heard from them again, until recently. Turns out I've paying for 2 years and 3 months - I sent the proof of the return and refund and they gave me 3 months refund.
Very poor, given they can easily check when I last logged in and used the service.
Obvs they make it difficult to cancel, and we now know why.
24 April 2025
Unprompted review
Reply from AliveCor
We understand your frustration regarding the unexpected subscription charges. Please note that returning the physical device does not automatically cancel an active KardiaCare subscription, and subscriptions will automatically renew unless explicitly canceled.
As outlined in our Terms of Use, we are unable to provide refunds for subscription charges, even in cases of non-use. However, as a gesture of goodwill, we were able to process a refund for the last 3 months of your subscription.
If you have any further questions or need assistance confirming that your cancellation is fully processed, please call our consumer support team at 855-338-8800.
So far a waste of money and time !
It arrived ok, the instructions were very vague and clearly written by somebody who new exactly how it worked, which means a lot of details on set up were skipped over without a clear order of instructions.
My first problem was that AliveCor 6L would not give me a download of the App so I could register, they said get it off the Play Store, when I tried the PS refused me a download saying I already had two devices registered with them.
After a couple of days I located a Kardia 6L setup download from an independent site which worked and I registered, my first ECG reading failed for half a day because the instructions were so vague, I selected the 6L setting because that was what I bought and it failed because the 2 finger pad only works on Kardia 6 not the L version which needs a third contact on the back of the sensor.
The graph it produced was unreadable on my phone so I downloaded it to a pdf which was also hardly readable on the phone, I did notice that there was no calibration on the graph of blood pressure or time so the graph was meaningless.
So far Its a waste of money and time and I'll stick with the simple wrist monitors which are more reliable and easy to use.
31 March 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for the frustrating setup experience. We want to help clarify a few things to get your device working smoothly.
First, the Google Play Store error regarding device limits is a Google account restriction, not an AliveCor setting. We highly recommend only downloading the official Kardia app from the Play Store or Apple App Store for safety and correct functionality.
Regarding the readings, the KardiaMobile 6L is an EKG, which measures the electrical activity of your heart. It does not measure blood pressure, which is why that data is not on the graph. The PDF grid lines represent time and voltage, which is the medical standard for EKGs. Additionally, your 6L device can actually take two types of readings: a Single-Lead EKG (using just your fingers on the top two sensors) or a Six-Lead EKG (using your fingers and placing the bottom sensor on your bare knee or ankle).
We would love to help you get everything set up correctly so it is easy to use and read. Please call our consumer support team directly at 855-338-8800 so we can walk you through the process step-by-step!
AVOID
AVOID. THE WORST CUSTOMER SERVICE EVER. POOR PRODUCT. DO NOT WASTE MONEY ON DOCTOR REVIEWS EITHER
12 March 2025
Unprompted review
Reply from AliveCor
We sincerely apologize for your incredibly frustrating experience with our product, the clinician review service, and our support team. This is absolutely not the standard we strive for, and we want to make things right. Please call our consumer support team directly at 855-338-8800 so we can immediately escalate your case and address your concerns.
Only work a couple of times
Only work a couple of times. Junk save your money!
7 March 2025
Unprompted review
Reply from AliveCor
We sincerely apologize that your device stopped working after only a few uses. We understand how frustrating this is, and we stand behind our products. Often, a quick battery change or a simple Bluetooth reset can resolve this immediately.
We want to make this right. Please call our consumer support team directly at 855-338-8800 so we can help troubleshoot the issue or evaluate your device for a warranty replacement if it is faulty.
KardiaMobile 6L works well in the DUSTBIN
I brought a KardiaMobile 6L from AliveCor.
If you connect the KardiaMobile 6L to your (Dustbin). It may work, you could try connecting It inside of your trash bin, it will work.
In other words AliveCor sent me a second hand rubbish contraption device, which broke down after one attempt. It is a rip off device, it needs to go to the trash tip.
AliveCor, will not give me a refund neither for the Kardia care.
The device is a con.
RUBBISH DEVICE
17 November 2024
Unprompted review
Reply from AliveCor
We sincerely apologize for your frustrating experience and that your device stopped working after a single use. We want to assure you that all devices shipped directly from AliveCor are brand new, but we completely understand your anger if you received a defective unit.
We absolutely want to make this right and investigate why your refund request was denied. Please call our consumer support team directly at 855-338-8800 and mention this review. This will allow us to immediately look into your account, review your KardiaCare and hardware refund status, and ensure you are taken care of properly.
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