The table compares mechanisms, not marketing feature lists.
| Identifying surface | JavaScript injection tools | SigoLogin |
|---|---|---|
| navigator, screen, hardware | yes | yes |
| Canvas / WebGL / Audio noise | yes, leaves marks | C++ layer |
| Client Hints in HTTP headers | no | yes |
| System font list | no | yes |
| TLS fingerprint (JA3/JA4) Coming soon | cannot | yes |
| HTTP/2 fingerprint | cannot | yes |
| Traces left by the injection itself | leaves marks | no marks |
"Cannot" means a limit in principle, not a feature nobody has built yet: JavaScript runs after the TLS handshake has already finished.
