Polar
Polar is a single-page fetcher operated by Polar. It fetches one page (or a small set) when triggered by a user action, typically a link being shared on social media, a messaging app, or an RSS reader.
Volume tracks shares and clicks rather than crawl schedules. A trending link can produce a sudden spike, but Polar will not crawl the rest of your site.
Blocking it usually means the link previews on the corresponding platform stop showing your title, image, and description.
See Polar on your own site
Match the User-Agent header on incoming requests against the pattern below.
regex
For higher confidence, also verify the source IP against the operator's published ranges. UA strings can be spoofed; IP ownership is harder to fake.
Renders JavaScript
No
IP verification
User-Agent only
Crawl frequency
Per user action
Honors robots.txt
Yes
Honors Crawl-delay
Varies
Should I let Polar through?
In most cases, yes. Fetchers power link previews and feed readers. Blocking breaks the user experience on social and messaging platforms. If volume gets noisy, rate-limit it before you block it outright.
Does blocking Polar affect my Google rankings?
No. Polar is not a search-engine crawler. Your ranking on Google or Bing is unaffected by what you do here.
How do I confirm a request is really from Polar?
Look at the User-Agent header in your access logs and match it against the strings listed above. Worth knowing that the User-Agent is easy to fake, so this check tells you "the traffic claims to be Polar", not "the traffic is genuinely Polar". If you need stronger guarantees, look for a reverse-DNS check or wait for Polar to publish IP ranges.
What breaks if I block Polar?
Link previews, embeds, and unfurls on whatever surface Polar feeds will stop rendering. Users sharing your URLs into Polar will see a bare link instead of a rich card. Usually that's the first thing people regret blocking.
What's the cleanest way to control Polar?
Two layers. Robots.txt for the polite crawlers that read it, and rules at your CDN or edge for the ones that don't. Rankly's Agent Experience handles both from a single config, so you can allow, block, rate-limit, or serve a stripped-down version per bot. Agent Analytics handles the observation half so you know which bots are actually worth a rule.