Probely vs KeyDrift
Accessibility-for-non-experts DAST with guided UX.
Positioning lowers DAST expertise barrier for product engineers.
This page compares the two honestly: strengths credited specifically, differences traced to structure rather than quality, and a decision rule at the end. Verified August 2026.
What Probely does well
Guided scanning UX.,API-first automation support.,Compliance-report helpers.
- Web applications/APIs.
- DAST engines curated.
- Scheduled scans.
The gap KeyDrift fills: the deployed bundle
Where the two diverge is timing and target. Probely evaluates work as it moves through your pipeline; KeyDrift evaluates what has already shipped, from the outside, the way an attacker or a researcher would fetch it. The gap between those two views is not theoretical — it is exactly where NEXT_PUBLIC_ substitutions and copied-in demo keys live.
- Fetched-and-diffed scanning of live URLs, including chunks reachable only through route manifests.
- Streamed server data (
self.__next_f.push,window.__NUXT__) read as carefully as chunk files. - Calibrated dispositions: Supabase anon keys, publishable keys and Firebase web keys recognised as public-by-design instead of reported as leaks.
- Drift transitions — created, regressed, resolved — so a reintroduced key alerts as a regression, not as news.
Feature-by-feature
- Surfaces scanned. Self-serve. versus KeyDrift: deployed web artifacts fetched live, or pasted bundle source for anything behind a login.
- Detection approach. product teams without dedicated appsec. versus KeyDrift: 21 secret detectors across 13 providers with placeholder rejection, alphabet-normalised entropy, payload decoding and a confidence floor below which matches are dropped rather than caveated.
- Change over time. Nearest-posture competitor philosophically — still vuln-class first. The credential lens remains additive. versus KeyDrift: scheduled scans diffed into created/regressed/resolved with alert routing to email, Slack, Discord and webhooks.
- Getting started. undefined versus KeyDrift: paste a URL at /scan — free, no account — or paste source for private surfaces.
Side-by-side
Every cell below states a specific capability. Where Probely documents more detail than fits here, follow their docs; where KeyDrift claims something, it is verifiable in a two-minute free scan.
| Capability | Probely | KeyDrift |
| --- | --- | --- |
| Primary surfaces | Self-serve. | Deployed web artifacts fetched live: HTML, all chunks (incl. route-manifest-only), streamed payloads |
| Build-time substitution (NEXT_PUBLIC_/VITE_) | Not a documented capability | Detected in served output — exactly where it lands |
| Hydration payloads (self.__next_f.push, window.__NUXT__) | Vulnerability-focused tooling; credential payload reading not documented | Read as carefully as chunk files |
| Public-vs-secret calibration | Not applicable to scope | Dispositions built-in: anon/publishable/Firebase-web reported informational, sample keys rejected by name |
| Change over time | Nearest-posture competitor philosophically — still vuln-class first. The credential lens remains additive. | Scheduled scans diffed into created/regressed/resolved; regression alerts name comebacks |
| Alert routing | Nearest-posture competitor philosophically — still vuln-class first. The credential lens remains additive. | Email · Slack · Discord · raw webhooks with per-destination severity thresholds |
| Getting started | undefined | Paste any URL at keydrift.dev/scan — free, no account; paste-source mode for behind-login surfaces |
| Privacy of findings | Varies by vendor | Masks + salted fingerprints only; no column anywhere can hold a live secret |_Cells describing Probely summarize their public documentation as of the verified date above._
Where each one wins
- Probely wins when undefined
- KeyDrift wins when the question is “what credentials can strangers retrieve from this deployment right now?” — live fetching, calibrated dispositions, and regression alerting without agents installed.
Switching from Probely
Teams arriving from Probely usually keep their existing setup and add one job: point KeyDrift at production, staging, and preview URLs. First week looks like this — day one, run the free scan on every deployment and triage findings by severity; day two, fix or schedule fixes using the linked guides; day three onward, monitoring watches for regressions while Probely continues doing what it does best.
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Decision rule
- Keeping Probely for its documented strengths makes sense — it earns them.
- Add KeyDrift when deployment truth matters: post-build artifacts, preview URLs, and reintroduction watch on a schedule.
_Compared against Probely documentation and pricing as verified August 2026. Capabilities change; check their site._ Probely and associated marks are trademarks of Probely, referenced for identification and descriptive comparison.
Bottom line: if your question is “is our source clean?”, Probely may already answer it well. If your question is “what can a stranger pull from our live JavaScript right now?” — only a scanner that fetches deployments can answer, and that is the entire product on this side of the table.
How teams actually run Probely and KeyDrift together
In practice the pairing is boring in the best way: Probely stays authoritative for whatever it was built to do, KeyDrift runs on a schedule against every public deployment, and alerts route into the same channels your team already reads. Nothing is migrated; nothing is turned off. The only new habit is reading one more alert type — and that one arrives masked, classified, and linked to a fix guide.
What to verify on their site before deciding
- Their current scanned-surface list (Self-serve.) — confirm against your stack.
- Whether drift/change-detection over time is part of their product or a roadmap item.
- Free-tier shape: what you can prove about YOUR deployment before any purchase conversation.
Common questions
Is Probely bad at security?
No — the page credits specific strengths above. The difference is which artifact gets inspected, not effort or care.
Pricing comparison?
Their list pricing lives on their site and changes; ours sits on the plans page with findings visible free at every tier. Numbers go stale; philosophy does not.
Run a free scan at keydrift.dev/scan — paste a URL or the bundle source itself, no account. Findings arrive masked, with the exact chunk they live in.