Cybersecurity · head to head
OWASP ZAP vs ThetaRay
OWASP ZAP
Cybersecurity
Free, open-source web application scanner and intercepting proxy, now governed by the Software Security Project.
- From
- Free
- Rated
- -
ThetaRay
Cybersecurity
Unsupervised AI transaction monitoring for cross-border and correspondent banking
- From
- On request
- Rated
- -
The short version
- Only OWASP ZAP has a free tier, so it costs nothing to try first.
- Each has a real cost: OWASP ZAP authenticated scanning of modern single-page applications is the hard part and ZAP makes you build it by hand: session handling, token refresh and login scripts are configured per application, and a misconfigured session means the scanner logs itself out and reports a clean result for pages it never reached.; ThetaRay unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
- They diverge on capability: OWASP ZAP covers Intercepting proxy, ThetaRay covers Unsupervised detection.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which OWASP ZAP and ThetaRay actually diverge.
Identical on both: user rating (Not yet rated), category (Cybersecurity).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in OWASP ZAP
- Intercepting proxy
- Passive scanner
- Active scanner
- AJAX spider
- Automation Framework
- Headless daemon and REST API
- Docker images
- Add-on marketplace
Only in ThetaRay
- Unsupervised detection
- Cross-border focus
- Sanctions screening
- Alert triage
- Customer risk scoring
- Cloud native
What people use each for
The jobs each tool is most often brought in to do.
OWASP ZAP
- Adding a baseline security scan to every application's pipeline where per-target commercial licensing would limit coverage to a handfulnot ThetaRay
- Manual penetration testing that needs an intercepting proxy, request replay and fuzzing without a paid licence per testernot ThetaRay
- Teaching developers what an attack against their own endpoint looks like, using a tool they can install themselvesnot ThetaRay
- Pre-release regression scanning of an internal application that would never justify a commercial DAST subscriptionnot ThetaRay
ThetaRay
- A correspondent bank that cannot see the ultimate originator and needs behavioural signals rather than counterparty listsnot OWASP ZAP
- A cross-border payments fintech whose rules engine produces more alerts than its compliance team can clearnot OWASP ZAP
- A bank under a regulatory consent order needing demonstrable improvement in detection within a fixed periodnot OWASP ZAP
- A payment institution entering a high-risk corridor where existing thresholds were calibrated on domestic trafficnot OWASP ZAP
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
OWASP ZAP
- Authenticated scanning of modern single-page applications is the hard part and ZAP makes you build it by hand: session handling, token refresh and login scripts are configured per application, and a misconfigured session means the scanner logs itself out and reports a clean result for pages it never reached.
- There is no support contract in the product, so when a scan breaks the day before a release the escalation path is a GitHub issue and a community chat, which is not an answer that satisfies a delivery manager or an auditor who wants a named responsible party.
- Active scanning sends genuine attack traffic, so it can create records, trigger emails, exhaust rate limits or destabilise a fragile environment, and pointing it at production without prior agreement produces an incident rather than a test result.
- Output needs triage: passive rules generate large volumes of low-severity informational findings about headers and cookie flags that bury the few results that matter, and a team without someone tuning the rule set stops reading the report within a few sprints.
- As a dynamic scanner it can only test what it can reach, so authorisation flaws between accounts, business logic abuse and anything behind an undiscovered endpoint go unreported, and a passing ZAP scan is evidence of nothing more than the absence of the classes of bug it looks for.
ThetaRay
- Unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
- The alert reduction claim depends heavily on your data, so a parallel run is essential and adds months and cost before you can decommission the incumbent.
- Coverage is strongest in cross-border and correspondent flows; institutions whose risk is domestic retail fraud will find the fit weaker than a general-purpose monitoring platform.
- It is a smaller vendor than the incumbents, so integration connectors into legacy core banking systems are often bespoke work rather than a supported adapter.
- Model retraining and tuning are vendor-led, which means changing detection behaviour is a support conversation rather than something your own analysts can do that afternoon.
Pricing, plan by plan
OWASP ZAP
Free- Free & Open SourceFree
- Full functionality
- Active & passive scanning
- Spider
ThetaRay
On request- ThetaRay Sonar$undefined/year
- Priced by monitored transaction volume and number of monitored entities
- SaaS on Azure with regional data residency options
- Parallel run and model tuning included in onboarding
Which should you pick?
Choose OWASP ZAP if
- You need intercepting proxy.
- You want to start without paying.
- You work on Desktop, Cli, Api.
- You also want passive scanner.
Questions people ask
- Is OWASP ZAP or ThetaRay better?
- Neither clearly leads. OWASP ZAP starts at Free and ThetaRay at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, OWASP ZAP or ThetaRay?
- OWASP ZAP has a free tier; the other does not. Paid plans start at Free for OWASP ZAP and On request for ThetaRay.
- Does OWASP ZAP or ThetaRay run on more platforms?
- OWASP ZAP runs on Desktop, Cli, Api. ThetaRay runs on Web.
- Can I use OWASP ZAP for free?
- Yes. OWASP ZAP has a free tier, so you can try it without paying. ThetaRay starts at On request.
- What is OWASP ZAP best used for?
- OWASP ZAP is most often used for adding a baseline security scan to every application's pipeline where per-target commercial licensing would limit coverage to a handful, manual penetration testing that needs an intercepting proxy, request replay and fuzzing without a paid licence per tester, teaching developers what an attack against their own endpoint looks like, using a tool they can install themselves, pre-release regression scanning of an internal application that would never justify a commercial dast subscription. Of those, adding a baseline security scan to every application's pipeline where per-target commercial licensing would limit coverage to a handful and manual penetration testing that needs an intercepting proxy, request replay and fuzzing without a paid licence per tester are not what ThetaRay is typically brought in for.
- What can OWASP ZAP do that ThetaRay cannot?
- OWASP ZAP covers Intercepting proxy, Passive scanner, Active scanner, AJAX spider. ThetaRay covers Unsupervised detection, Cross-border focus, Sanctions screening, Alert triage.
Answered from the vendors’ own pages
OWASP ZAP: Is it still called OWASP ZAP?
The project left OWASP in August 2024 and is now governed by the Software Security Project, with core development sponsored by Checkmarx. The tool is now just ZAP, though most existing documentation, courses and search results still use the OWASP name.
ThetaRay: Does it replace a rules engine entirely?
Rarely on day one. Most institutions run it alongside existing rules during a parallel period, and some keep specific regulator-mandated rules permanently.
OWASP ZAP: Is it free for commercial use?
Yes. It is Apache 2.0 licensed, with no per-application, per-scan or per-user cost, and it can be used and modified commercially without a licence agreement.
ThetaRay: Where is the data processed?
SaaS runs on Microsoft Azure with regional deployment options, which is the mechanism for meeting data residency conditions in regulated markets.
OWASP ZAP: Can it replace a penetration test?
No. It automates checks for known vulnerability classes against endpoints it can reach. It does not reason about business logic, chain findings into an attack, or test authorisation between accounts, which is most of what a tester actually does.
ThetaRay: Is sanctions screening included?
Screening is available on the same platform but licensed as part of the commercial package rather than bundled by default. Confirm it is in your quote.
OWASP ZAP: Does it run in CI?
Yes, through the official Docker images and the Automation Framework, which defines scan jobs in YAML so configuration lives in the repository. A baseline passive scan is the usual starting point because it is fast and non-intrusive.
OWASP ZAP: How does it compare to Burp Suite?
Burp Suite Professional is the more polished manual testing tool and has a stronger scanner and extension ecosystem, but it is licensed per tester and Burp Suite Enterprise per target. ZAP is the better fit where cost per target is the binding constraint; many teams use both.
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