Compare

Overt vs. BuiltWith & Wappalyzer.

BuiltWith and Wappalyzer detect a site's stack. Overt does too — across 1,000+ technologies — and shows the evidence behind every detection, tracks what changes, and adds company context. Here is how that compares, honestly.

Comparison

The same stack — with the proof, and the changes.

BuiltWith and Wappalyzer tell you what's installed. Overt does too — across 1,000+ technologies — but shows the exact evidence behind every detection and flags the day a site changes its stack. The same lookup, with an answer you can defend.

Plus the things the others skip — the evidence behind each detection, per-site change alerts, a 7-day freshness floor, and company size & registry data where available.

Capability	Overt	BuiltWith	Wappalyzer
Technology detection — all categories	✓	✓	✓
Find every site using a technology (lists + export)	✓	✓	✓
Public API	✓	✓	✓
Evidence + confidence behind each detection	✓	·	·
Per-site change history & alerts	✓	~	~
Continuously re-verified (freshness floor)	✓	~	~
Company context — size & registry data	✓	·	·

✓ full · ~ partial · · not offered. Category comparison of typical capabilities, not a feature audit of any one release.

Where Overt fits against each

These are established tools that do their job well. Overt is not a drop-in for any single one — it is the layer that fuses what each sees separately, with the evidence attached.

BuiltWith Technology lookups

What it’s for

The classic technographics dataset — which sites run which technologies, at scale, with years of adoption history. Strong for big tech-based lead lists and long-run market trends.

Where Overt differs

BuiltWith tells you a site uses a technology. Overt shows the exact signal it read to decide — the CNAME, the header, the script — scores its confidence, and flags the day the site changes its stack, re-verified so nothing you act on is older than seven days. The same lookup, with an answer you can defend.

Wappalyzer Technology lookups

What it’s for

The developer-friendly detector and browser extension — quick tech profiles, lists and a clean API, with a generous free tier. Great for a fast read on a single site.

Where Overt differs

Wappalyzer gives you the list; Overt gives you the list plus the evidence behind each detection, a confidence score, per-site change history, and company context where available — through the same self-serve app and API.

Category comparisons, not feature audits. Each incumbent is named for its category and described by what it is built for — not a snapshot of any one release. Overt is in early access; these are differences of method and design, not customer counts.

See it on a site you already know.

The fastest way to judge the difference is to look up a site you can verify yourself — its full stack and the exact signal behind each detection, in a few seconds. Free, no signup.

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