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Please enable JavaScript to use this service.
If you are using Tor Browser, you can view
CAPTCHA Monitor in 'Safer' mode.
CAPTCHA Monitor only uses JavaScript resources that
are hosted by the CAPTCHA Monitor server.
The CAPTCHA Monitoring project
aims to track how often Cloudflare fronted
websites return CAPTCHAs to Tor clients.
The project aims to achieve this by fetching
webpages via both Tor and other mainstream
web browsers and comparing the results.
The tests are repeated periodically to find
the patterns over time.
Collected metadata,
metrics, and results are analyzed and
displayed here to understand how Cloudflare
manipulates internet traffic and affects
people's access to the internet.
Please visit the
project website
for more
detailed information.
You can use the measurement search at
/measurements
to see individual measurements and more data.
If you prefer to access the raw data, you can use
the API at
api.captcha.wtf