It used to work in the past.
Safari version: v26.3 (21623.2.7.11.6)
MacOS Tahoe 26.3
The page keeps being empty/blank. Not much network activity. The following error pops up on the dev console.
TypeError: ‘text/html’ is not a valid JavaScript MIME type.
See the HTML code the browser receives below.
<!DOCTYPE html>
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<title>Intervals.icu</title>
<meta name="apple-mobile-web-app-title" content="Intervals.icu"/>
<meta name="description" content="Intervals.icu integrates with Strava, Zwift, Garmin Connect, Suunto, Wahoo and Dropbox, analyzes your rides, runs, swims and other activities and helps plan your training"/>
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<strong>We're sorry but this app doesn't work properly without JavaScript enabled.
Please enable it to continue.</strong>
<h2>Intervals.icu</h2>
<p>
Everyone knows that the best way to improve as a cyclist is to do power based interval training. However
its not always easy to motivate yourself to ride halfway up and down the same hill 8 times in a row.
<b>Intervals.icu automatically detects intervals</b> so you can ride your favourite route,
punish the rollers and still get good stats to track your progress. Forgot to hit the lap button? No problem!
</p>
<h3>Features</h3>
<ul>
<li>Automatic interval detection in rides with real power data</li>
<li>Comprehensive stats for each interval (power, heartrate, w/kg, torque, cadence, intensity, power zone etc.)</li>
<li>Automatic grouping of similar intervals with average stats for the group</li>
<li>Ride timelime chart showing power, cadence, heartrate, torque, training load etc. that highlights intervals with zoom</li>
<li>FTP estimation from a single 60s+ maximal effort (no tests!), with training load based decay</li>
<li>Ride power page with time in zones, power histogram, power curve (with season curve) and best power/duration efforts</li>
<li>Athlete power page with power curve (for last 42 days, season etc.), FTP estimation, best power/duration efforts, power models</li>
<li>Automatically detects and fixes power spikes</li>
<li>Manual editing of ride data is also supported</li>
<li>Comparison chart comparing intervals to similar intervals in previous rides</li>
<li>Calendar style training log with interval summaries and weekly stats (training load, time in power zones etc.)</li>
<li>Training load automatically estimated for HR only rides from previous rides with HR and power</li>
<li>Performance management / fitness chart tracking fitness, fatigue and form over time</li>
<li>Uses the standard Coggan metrics</li>
<li>Email notification when you achieve new best power/duration efforts and when your FTP increases</li>
<li>Download ride data in CSV format</li>
</ul>
<p>Heartrate based interval detection is under development.</p>
</noscript>
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if (match && parseInt(match[2]) <= 11) {
var appNode = document.getElementById("app");
appNode.attributes.removeNamedItem("id");
appNode.innerHTML = "<h3>Unfortunately Intervals.icu only works on modern browsers<br>Please try " +
"<a href='https://www.google.com/chrome/'>Google Chrome</a></h3>";
window._intervalsOldBrowser = true;
}
</script>
</body>
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