alivecor.com website review

The page has 4,189 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

About 189 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 900 ms faster on a phone.

Your mobile performance score is 66 (desktop: 92). Pages that score under 90 lose visitors before the first paint.

9 files are served with short cache lifetimes, so returning visitors download them again (200 KiB).

2 files block the first paint until they finish downloading. Deferring or inlining them could save about 450 ms.

Polyfills for old browsers add 26 KiB JavaScript that modern phones do not need. Google estimates it would make the page about 300 ms faster on a phone.

4 third-party services load with your homepage (Facebook, Cookiebot and Bazaarvoice and others), adding 368 KiB and 276 ms of main-thread time.

5 long tasks block the main thread while loading, the longest for 148 ms. During a long task the page ignores taps.

About 12 KiB of CSS is downloaded but never applied on this page.

Desktop scores 92 but mobile only 66. A gap that wide usually means heavy scripts and images that hit phones hardest.

Real Chrome users on phones do not pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)). Google uses this in ranking.

Your largest element takes 8.8 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “We use third-party cookies to improve the user experience a…”. Most of its time is element render delay (3.7 s).

Visually, the page fills in at 7.6 s (Speed Index). Good is under 3.4 s.

The page becomes fully interactive after 8.9 s. Good is under 3.8 s.

Real visitors wait 3.3 s for the largest content to appear (75th percentile). Good is under 2.5 s.

Real visitors wait 1.4 s for your server to start answering (75th percentile). Good is under 800 ms.

Over the last 25 four-week periods to 2026-10-10, real Chrome visitors' tap response (inp) went from 92 ms to 110 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-10-10, real Chrome visitors' largest content (lcp) went from 2.8 s to 2.9 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

By the Sustainable Web Design model, a visit to your homepage emits about 0.27 g of CO₂e: 32.9 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

3 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

Headings should not be empty: 2 elements on the page fail this check, rated minor by axe-core.

Headings skip levels (h2 → h5 and h2 → h5), which makes the page harder to scan with a screen reader.

Elements with visible text labels do not have matching accessible names. (1 element).

Your title is only 24 characters: “AliveCor | AliveCor Home”. Between 30 and 65 characters leaves room to say what you do and for whom.

No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

Your meta description is only 41 characters: “The easiest way to acquire a 12-lead ECG.”. 70 to 160 characters is enough to sell the click.

No Open Graph image, so links shared on LinkedIn, Slack or Facebook show no preview picture.

1 link use generic text like “click here” or “learn more”, which tells Google nothing about the page behind it.

The homepage links to 48 pages on alivecor.com and 22 external pages.

There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.

There is no /llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.

Your homepage links to /patient-engagement-solutions, which answers with an error. Visitors hit a dead end and search engines drop it.

/forms/2-week-trial, /products/kardia12l, /products/kardiamobile6l, /products/alivecor-k1000, /products and /kardiapro and 6 others use the same meta description. A description written for each page earns more clicks.

/products/kardia12l took over 3 s to send its HTML from our server.

We fetched 15 pages linked from your homepage (of 29 found) and read each the way a search engine does.

3 of 11 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

1 link from your homepage to your own site is broken, for example https://alivecor.com/patient-engagement-solutions (404).

No Content-Security-Policy header, the main browser-side defence against injected scripts.

Neither X-Frame-Options nor a CSP frame-ancestors policy is set, so any site can embed yours in a frame.

X-Content-Type-Options: nosniff is missing, so browsers may guess file types.

2 links go through two or more redirects, for example https://www.twitter.com/alivecor/.

No Referrer-Policy header, so full URLs can leak to the sites you link to.

No Permissions-Policy header to switch off camera, microphone and location for embedded content.

There is no /.well-known/security.txt telling researchers how to report a security problem to you.

alivecor.com is registered until Dec 2026. Make sure auto-renew is on and the card on file is current.

alivecor.com has no CAA record, so any certificate authority may issue a certificate for it. A CAA record naming your provider (for example letsencrypt.org) closes that door.

alivecor.com's DNS answers are not signed. DNSSEC stops attackers forging them to send visitors or email elsewhere; most registrars switch it on in a click, though most sites still run without it.

Social proof on the homepage: 1 customer or partner logo. Pairing it with named testimonials or customer logos makes it far more convincing.

No analytics or tag manager detected in the HTML, so you can't measure whether any of these fixes work.

There is no form on the homepage, so every lead has to click through to another page first.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

The homepage carries about 394 words of visible text.

Email authentication: SPF record 25 points, plus 15 when it ends in -all (10 for ~all); DMARC record 25, plus 25 for a reject policy (15 for quarantine); a DKIM key on a common selector 10.

Before a visitor clicks anything, the page loads Meta Pixel (measured from a US location before any click). A consent tool (Cookiebot) is installed; check it blocks these until visitors agree where the law requires it.

Opening the homepage sets 1 cookie (measured from a US location before any click).

Loading the homepage contacts 7 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.