We estimate the number of users by analyzing the requests induced by clients to relays and bridges.
This graph shows the estimated number of directly-connecting clients; that is, it excludes clients connecting via bridges. These estimates are derived from the number of directory requests counted on directory authorities and mirrors. Relays resolve client IP addresses to country codes, so that graphs are available for most countries. Furthermore, it is possible to display indications of censorship events as obtained from an anomaly-based censorship-detection system (for more details, see this technical report). For further details check the documentation on Reproducible Metrics.
The following events have been manually collected in the metrics-timeline Git repository and might be related to the displayed graph.
|Description and Links
Release of Tor Browser 10.5, first stable release that includes Snowflake.
|2021-06-20 to 2021-06-24
Social media blocking during national high school exams.
Snowflake bridge down for scheduled upgrade.
|2021-06-12 to 2021-06-13
Outage of Snowflake bridge.
|2021-06-10 to present
Experiment to test latencies between relays.
status.torproject.org post announcing start
geoip and geoip6 databases updated to "IPFire Project Thu, 10 Jun 2021 05:17:29 GMT" (
|2021-06-04 to present
Block of Twitter in Nigeria. Increase in the number of bridge users.
article relay graph bridge graph
|2021-05-17 to 2021-06-05
Experiment to test the accuracy of relays' advertised bandwidth estimation.
status.torproject.org post announcing start post announcing end advertised bandwidth graph relay flags graph
|2021-05-14 to 2021-05-18
The number of meek users temporarily drops to < 10.
|2021-05-12 to 2021-06-21
Error in stats collection at the Snowflake bridge; user count is erroneously zero.
merge request comment on start comment on end user count graph
geoip and geoip6 databases updated to "IPFire Project Fri, 07 May 2021 05:18:14 GMT" (
|Turkmenistan meek Unknown
Drop in meek users in Turkmenistan, from over 200 to almost zero.
bridge user and transport graph
Outage of snowflake bridge.
|2021-02-15 to 2021-04-27
Nightly shutdowns of fixed-line Internet in Myanmar.
relay graph bridge graph OONI report IODA for start IODA for end Access Now post censorship-analysis issue
This material is supported in part by the National Science Foundation under Grant No. CNS-0959138. Any opinions, finding, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. "Tor" and the "Onion Logo" are registered trademarks of The Tor Project, Inc.. Data on this site is freely available under a CC0 no copyright declaration: To the extent possible under law, the Tor Project has waived all copyright and related or neighboring rights in the data. Graphs are licensed under a Creative Commons Attribution 3.0 United States License.