swi-prolog.org

Swi-prolog.org

SWI-Prolog -- an LGPL comprehensive portable Prolog compiler

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Authority

72/100

Safety

90/100

Registered

Dec 17, 2001

24 years old · Key-Systems GmbH

All 4 safety checks passed (Sep 18, 2026).

Current facts

Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.

Authority & Safety, with the evidence

How this is scored →

Authority 72/100 — ahead of 72% of the August 2026 scored sampleClear

Why this authority score

Prominence (Tranco rank #77,833)+7
Verified continuity: 24.8 years (RDAP registration)+11
Security & email hygiene+4
Calibration adjustment (published map)+14

These lines explain the underlying model score of 36/99, which is what places this site at 72/100 using the August 2026 scored sample. Public Authority is capped at 99.

Safety evidence

No unexpired threat-feed result; name-similarity check available (recorded about 27 days ago); 3/3 transport and email checks available (oldest recorded about 27 days ago). This is evidence coverage, not a probability that a website is safe.

No caution flags in the available scoring observations; this is not a complete safety assessment

Site history

Dated record — historical facts always carry their date.

2001
Domain registered (Dec 17, 2001).
2026
Checked today — All 4 safety checks passed (Sep 18, 2026).

✓ domain continuity 24 years registered✓ live verified Sep 18, 2026

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