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Website evidence · pilot dataset

Does slack.com fingerprint you?

No monitored fingerprinting signals observed in the latest measured scans.

No monitored signal family met its threshold in the latest measured scans. This limited visit does not establish that the site never fingerprints visitors. Earlier runs remain available below.

Open evidence JSON ↗

All 6 source records are included in the JSON. Scan timestamps and versions are shown as recorded. The tabs show the latest usable homepage measurement for each setup. Later failed attempts remain in the history. Scan scope and methodology ↗

Inside the scan

← All websites

Visitor setup

Not observed

0 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Not observed
Measurement
Measured · Partial load
Page context
Page document
Scan time
2026-10-22T16:32:30.124367Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleSlack | AI Work Platform & Productivity Tools

CanvasDraws text and reads canvas output.2 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • Inline caller recorded
canvas.getContext1 calls

Frame: https://slack.com/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.3 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.userAgent2 calls
  • Inline caller recorded
navigator.userAgent3 calls

Frame: https://slack.com/

  • https://d34u8crftukxnk.cloudfront.net/snippets/11179690159.jsline 2 · col 108173
  • https://d34u8crftukxnk.cloudfront.net/snippets/11179690159.jsline 2 · col 310422
window.devicePixelRatio1 calls
  • Inline caller recorded
Providers, script signatures, and DNS 1 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Optimizely (A/B testing)a11179690159.cdn.optimizely.com, cdn3.optimizely.com, logx.optimizely.com
Network and worker observations 118 requests
Captured scripts
2
Instrumented frames
2
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • a.slack-edge.com
  • a11179690159.cdn.optimizely.com
  • api.company-target.com
  • cdn.cookielaw.org
  • cdn3.optimizely.com
  • d34u8crftukxnk.cloudfront.net
  • logx.optimizely.com
  • reveal.clearbit.com
Other recorded API calls 2
  • document.cookie.read8 calls
  • document.cookie.write2 calls
Source record and integrity
Original source
results/headful/slack-com-20261022T163230.json
Original file SHA-256
9d6ada15b3254f7e19af28ff610623b9ccdbbba6a19a9e8929049311f2752ad5

Run ID: headful-9d6ada15b325. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (2)

Visitor setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-21T23:00:40.673991Z
Browser / scanner
156.0.8078.4 / 0.3
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headful/slack-com-20261021T230040.json
Original file SHA-256
ee74a1ef19bb1db068dfae389f2fdd26bd6a3b1c17e5b3d20f95eb853d86115e

Run ID: headful-ee74a1ef19bb. The JSON contains sanitized observations, not the original private scan payload.

Visitor setup

Scanner error

Scanner error

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Scanner error
Page context
Page not measured
Scan time
2026-10-22T16:32:29.408266Z
Browser / scanner
156.0.8078.4 / 0.4
Scanner error — no usable scan result

The scanner crashed while collecting this page. No usable API results were saved for this setup. A fresh scan is needed; this is not a site-blocking verdict.

Source record and integrity
Original source
results/headful/slack-com-20261022T163229.json
Original file SHA-256
d79f9ccc1b4c76c4192775a149b431e51ff174609cf00c4931081e3206551a0d

Run ID: headful-d79f9ccc1b4c. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Not observed

0 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Not observed
Measurement
Measured · Partial load
Page context
Page document
Scan time
2026-10-22T23:23:34.550181Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleSlack | AI Work Platform & Productivity Tools

CanvasDraws text and reads canvas output.1 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls

Frame: https://slack.com/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.1 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.userAgent2 calls

Frame: https://slack.com/

  • https://a.slack-edge.com/bv1-13-br/rollup-marketing.92159601930c7313.marketing.min.jsline 2 · col 14293
  • https://a.slack-edge.com/bv1-13-br/rollup-marketing.92159601930c7313.marketing.min.jsline 141 · col 47352
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

No provider or DNS evidence in this record.

Network and worker observations 103 requests
Captured scripts
6
Instrumented frames
1
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • a.slack-edge.com
  • cdn.cookielaw.org
  • d34u8crftukxnk.cloudfront.net
  • reveal.clearbit.com
Source record and integrity
Original source
results/headless/slack-com-20261022T232334.json
Original file SHA-256
cc2f16bd88a89e6ee06e8b3d53c5264ce14bc5b82328398c35ee9939fd6b76d5

Run ID: research-cc2f16bd88a8. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (2)

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-21T21:20:05.375088Z
Browser / scanner
156.0.8078.4 / 0.3
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/slack-com-20261021T212005.json
Original file SHA-256
536304529fd29e1f449ebc1ac2abcd2135d2a3807f2091aeff1907bf4825fb59

Run ID: research-536304529fd2. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-22T18:57:57.622916Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/slack-com-20261022T185757.json
Original file SHA-256
e207fb66e57903470836ead042e54aae72fbc23e42d875e77fe2a35cb15ae728

Run ID: research-e207fb66e579. The JSON contains sanitized observations, not the original private scan payload.

Queries, request bodies, cookies, extracted values, raw errors, and session payloads are excluded before publication. The source digest identifies the original private record.

Read the sanitized JSON →