DAST Tools Comparison: ZAP vs Burp Suite vs Invicti vs Acunetix vs Nuclei (2026)
Written by the Rafter Team
Dynamic application security testing tools probe your running applications for vulnerabilities that static analysis cannot reach — authentication flaws, server misconfigurations, runtime injection points, and broken access controls. DAST tools send real HTTP requests against a live target, observe the responses, and flag exploitable weaknesses without ever reading your source code.
Choosing the right DAST tool depends on your budget, scan speed requirements, false positive tolerance, and how deeply you need to test authenticated workflows and APIs. This comparison covers the five most widely used options — with enough detail to help you make an informed decision without running a proof-of-concept against every product on the market.
DAST scanners hit live endpoints. Running them against production without rate limiting can cause outages. Always scan staging environments first, and confirm authorization before targeting any system you don't own.
Run automated security scans on every commit with Rafter — pair DAST with SAST and SCA for full-stack coverage.
Tool-by-Tool Comparison
| Feature | ZAP | Burp Suite | Invicti | Acunetix | Nuclei |
|---|---|---|---|---|---|
| Pricing | Free (open source) | $449+/yr (Pro), $8,999+/yr (Enterprise) | Enterprise pricing (custom quotes) | $4,500+/yr (Standard), $7,000+/yr (Premium) | Free (open source) |
| Deployment | Local, Docker, CI runner | Desktop (Pro), Server (Enterprise) | On-prem or cloud-hosted | On-prem or cloud-hosted | CLI, Docker, CI runner |
| Scan speed | Moderate | Moderate | Fast (parallel crawling) | Fast | Very fast (template-based) |
| False positive rate | Moderate-high | Low (with tuning) | Very low (proof-based) | Low | Low (template-specific) |
| API scanning | OpenAPI, GraphQL | OpenAPI, GraphQL, gRPC | OpenAPI, GraphQL, SOAP | OpenAPI, GraphQL | Template-driven |
| Authenticated scanning | Script-based | Full session handling | Built-in login recorder | Built-in login macro | Manual header injection |
| CI/CD integration | GitHub Actions, Jenkins, CLI | CLI, API | Native CI/CD plugins | Jenkins, GitLab, CLI | CLI, GitHub Actions |
| Reporting | HTML, XML, JSON, Markdown | HTML, XML, custom | PDF, compliance templates, HIPAA/PCI | PDF, compliance reports | JSON, Markdown, SARIF |
| Learning curve | Moderate | Steep | Low (guided UI) | Low-moderate | Low (YAML templates) |
ZAP (Zed Attack Proxy)
ZAP is the open-source standard for web application security scanning. Originally an OWASP flagship project, it is now community-maintained and remains the most widely deployed free DAST tool in the world. It offers automated scanning, manual testing proxying, active and passive scan rules, and a scripting engine that supports JavaScript, Python, and Zest scripts.
The zero cost makes it accessible to any team, but scan tuning requires expertise to reduce noise. Out-of-the-box scans tend to produce moderate-to-high false positive rates, especially on modern single-page applications. You will spend time writing scan policies, adjusting thresholds, and excluding endpoints that trigger false alerts.
ZAP's automation framework lets you define scan profiles in YAML and run them headlessly in CI. The Docker image ships with a set of packaged scans (baseline, full, API) that you can invoke with a single command. For teams that need repeatable scans without launching the GUI, this is the fastest path to CI/CD integration.
Strengths: Zero cost, large community, extensive scripting and plugin ecosystem, Docker-based CI integration, full proxy capability for manual testing.
Weaknesses: Higher false positive rate than commercial tools, limited support for complex authentication flows out of the box, no vendor support (community forums only), UI feels dated compared to commercial alternatives.
Pricing: Free and open source under the Apache 2.0 license. No paid tiers.
Best for: Teams with security experience who want a free, extensible scanner they fully control.
Burp Suite
Burp Suite dominates manual web application testing and is the de facto tool for penetration testers worldwide. PortSwigger offers three tiers: Community (free, limited), Professional ($449/year per user), and Enterprise ($8,999+/year for automated scanning at scale). The Professional edition adds an automated scanner, but Burp's real strength is its intercepting proxy and manual testing workflows.
Burp's crawler uses a browser-driven approach — it renders JavaScript, follows client-side routes, and builds an accurate site map even for complex SPAs. The scanner then attacks discovered endpoints with a comprehensive set of insertion points. You can tune scan configurations to focus on specific vulnerability classes or limit scan intensity for fragile applications.
Extensions are where Burp truly shines. The BApp Store hosts hundreds of community and PortSwigger-authored extensions. Logger++ captures and filters all traffic. Autorize replays requests with different authorization contexts to detect broken access controls. Custom Bambda filters let you write Java lambda expressions to process traffic in real time. If you need to test something unusual, someone has probably already built an extension for it.
Burp Suite Enterprise is a separate product designed for scheduled, automated scanning across application portfolios. It includes a web-based dashboard, role-based access, recurring scan schedules, and CI/CD integration via REST API. It is priced per concurrent scan and scales to hundreds of applications.
Strengths: Industry-standard intercepting proxy, massive extension ecosystem, browser-driven crawler handles SPAs well, Enterprise tier supports large-scale automation, excellent documentation and PortSwigger research.
Weaknesses: Professional license is per-seat and adds up for larger teams, Enterprise pricing is steep, automated scanning is secondary to manual workflow, initial learning curve is steep for non-security staff.
Pricing: Community (free), Professional ($449/user/year), Enterprise ($8,999+/year, scales by concurrent scans).
Best for: Penetration testers and security engineers who combine manual and automated testing.
Invicti (formerly Netsparker)
Invicti differentiates on accuracy. Its proof-based scanning confirms vulnerabilities by safely exploiting them — an SQL injection finding includes the actual extracted data as evidence. A command injection finding shows the output of a harmless command executed on the server. This dramatically reduces false positives and eliminates triage time. When Invicti marks something as confirmed, your developers can trust it and fix it without debating whether the finding is real.
Invicti uses a parallel crawling engine that can map large applications significantly faster than sequential crawlers. It handles JavaScript rendering, iframes, and multi-step forms. The built-in login recorder captures authentication sequences through a browser-based macro, which means you do not need to write scripts to test authenticated areas.
The platform includes asset discovery — it can scan your external attack surface and identify web applications you may not know about. For enterprises managing hundreds of internal and external applications, this discovery capability justifies the cost on its own.
Invicti integrates natively with issue trackers (Jira, Azure DevOps, GitLab Issues) and can auto-create tickets when confirmed vulnerabilities are found. It also supports compliance reporting templates aligned with PCI DSS, HIPAA, and OWASP Top 10.
Strengths: Proof-based scanning virtually eliminates false positives, parallel crawling is fast, built-in asset discovery, strong compliance reporting, login macro recorder reduces setup time.
Weaknesses: Enterprise pricing puts it out of reach for small teams, less flexibility for custom or manual testing than Burp Suite, closed-source with no community extension model.
Pricing: Enterprise pricing only — contact sales for quotes. Expect five-figure annual costs depending on application count and scan frequency.
Best for: Enterprise teams that need low false-positive scanning across large application portfolios.
Acunetix
Acunetix balances speed and accuracy with DeepScan technology that renders JavaScript-heavy applications before crawling. It handles single-page applications better than most DAST tools and includes built-in network scanning for a broader attack surface view. Login sequence recording simplifies authenticated scanning setup — you walk through the login flow once, and Acunetix replays it on every scan.
Acunetix offers both on-premises and cloud-hosted deployment. The cloud version provides a multi-tenant dashboard suitable for managed security providers or teams managing multiple targets. Scan results include remediation guidance mapped to specific frameworks (e.g., "in Express.js, set this header" rather than generic advice).
One area where Acunetix stands out is its AcuSensor agent. When you deploy AcuSensor on the target server, it adds interactive application security testing (IAST) capabilities — the scanner correlates its external findings with internal application behavior, pinpointing the exact line of code responsible for a vulnerability. This hybrid DAST+IAST approach produces more actionable results than either technique alone.
Acunetix also includes a built-in OpenVAS-based network vulnerability scanner. While it is not a replacement for a dedicated network scanner, it provides useful context about the infrastructure surrounding your web applications — open ports, outdated services, and TLS misconfigurations.
Strengths: Strong JavaScript rendering for SPAs, AcuSensor IAST integration, built-in network scanning, login macro recorder, both on-prem and cloud deployment.
Weaknesses: Pricing scales by target count and gets expensive at scale, AcuSensor requires server-side agent installation, fewer community extensions than ZAP or Burp.
Pricing: Standard ($4,500+/year per target), Premium ($7,000+/year per target with additional features). Volume discounts available.
Best for: Teams scanning modern JavaScript applications that need authenticated crawling with minimal configuration.
Nuclei
Nuclei takes a template-driven approach — each check is a YAML file describing the request, matcher, and expected response. The community maintains thousands of templates covering CVEs, misconfigurations, default credentials, exposed panels, and sensitive file exposures. Nuclei scans faster than traditional crawlers because it skips crawling entirely, targeting known vulnerability patterns directly.
This approach has a fundamental trade-off: Nuclei will not discover application-specific vulnerabilities like business logic flaws or custom injection points the way a crawling-based scanner would. It excels at checking whether known issues exist, not at finding novel ones. Think of it as a fast, programmable vulnerability checker rather than a traditional DAST scanner.
Writing custom templates is straightforward. A template specifies the HTTP request(s) to send, the matchers (status codes, body content, headers, regex), and metadata like severity and remediation advice. Teams use custom templates to codify their own security checks — verifying that security headers are present, that debug endpoints are disabled, or that internal APIs are not exposed.
Nuclei supports workflows that chain templates together. For example, a workflow might first detect the technology stack, then run only the templates relevant to that stack. It supports multiple protocols beyond HTTP, including DNS, TCP, and headless browser interactions.
ProjectDiscovery (the company behind Nuclei) offers a cloud platform for managing templates, scheduling scans, and viewing results in a dashboard. The open-source CLI remains fully functional on its own.
Strengths: Extremely fast execution, massive community template library, easy to write custom checks, multi-protocol support, lightweight CLI, SARIF output for GitHub code scanning integration.
Weaknesses: No crawling — you must know what to scan, limited authenticated scanning capabilities, not suited for discovering novel application-specific vulnerabilities, template quality varies across the community library.
Pricing: Free and open source. ProjectDiscovery Cloud offers a hosted platform with additional features (pricing varies).
Best for: Security teams that want fast, targeted checks against known vulnerability patterns and custom detection logic.
Evaluation Criteria: How to Choose
Picking a DAST tool is not about finding the "best" one — it is about finding the one that fits your constraints. Here are the criteria that matter most:
False positive rate. Every false positive costs developer time and erodes trust in your security tooling. If your developers start ignoring scan results because half of them are noise, the tool is doing more harm than good. Proof-based tools like Invicti minimize this. Template-based tools like Nuclei avoid it by testing only known patterns. Crawling-based scanners like ZAP require tuning to reach acceptable noise levels.
Authenticated scanning. Most real vulnerabilities hide behind login screens. If a tool cannot maintain an authenticated session while crawling, it is only testing your public attack surface. Evaluate how each tool handles session tokens, multi-factor authentication, CSRF tokens, and session expiration during long scans.
API coverage. Modern applications expose as much functionality through APIs as through HTML pages. Your DAST tool needs to parse OpenAPI specs, replay GraphQL queries, and handle token-based authentication for API endpoints. Tools that only crawl HTML will miss your entire API surface.
Scan speed and scheduling. A scan that takes eight hours is useless in a CI pipeline that needs to finish in minutes. Understand the difference between full scans (comprehensive but slow) and incremental or baseline scans (fast but limited). Most teams run fast scans in CI and full scans on a nightly or weekly schedule.
Reporting and integration. Scan results need to reach the people who fix them. Look for native integrations with your issue tracker, support for SARIF or other standard formats your CI platform consumes, and compliance report templates if you need them.
Integrating DAST into CI/CD
Running DAST in your pipeline requires a different approach than running it manually. Here is how to structure it:
Stage 1: Baseline scan on every pull request. Run a fast, limited scan that checks for high-severity issues — missing security headers, open redirects, basic injection flaws. This should complete in under five minutes. ZAP's baseline scan and Nuclei templates work well here.
Stage 2: Full scan on staging deployment. After your code deploys to a staging environment, trigger a comprehensive DAST scan. This is where authenticated scanning and deep crawling happen. Run it asynchronously and post results back to the PR or a dashboard. Burp Suite Enterprise, Invicti, and Acunetix all support this pattern.
Stage 3: Scheduled scans against production. Weekly or nightly full scans against production catch configuration drift, newly disclosed CVEs, and issues that only manifest in the production environment. Rate-limit these scans to avoid impacting real users.
Gate on severity, not on count. Blocking a deployment because a scan found a low-severity informational issue creates friction without improving security. Configure your pipeline to fail only on high or critical findings, and route everything else to your backlog.
The key to sustainable DAST in CI/CD is making scan results actionable. If a finding does not include enough context for a developer to fix it, it will sit in a queue forever. Prefer tools that provide reproduction steps, affected endpoints, and remediation guidance specific to your stack.
When to Combine DAST with SAST
DAST alone catches only runtime vulnerabilities. Pair it with static analysis to cover the full vulnerability lifecycle — SAST finds insecure code before deployment, while DAST confirms exploitability after deployment.
SAST analyzes your source code and finds issues like hardcoded secrets, insecure cryptographic usage, SQL injection patterns in code, and unsafe deserialization — all before the code ever runs. But SAST cannot find misconfigurations in your web server, broken authentication in your deployed application, or vulnerabilities introduced by the runtime environment.
DAST fills those gaps by testing the running application as an attacker would. But DAST cannot see code-level issues that do not manifest as observable behavior in HTTP responses — race conditions, insecure random number generation, or logging sensitive data to disk.
The strongest security posture combines both with software composition analysis for dependency risks. SCA identifies known vulnerabilities in your third-party libraries, giving you a complete picture: insecure code (SAST), exploitable runtime behavior (DAST), and vulnerable dependencies (SCA).
The three-layer approach: SAST catches it in code review, SCA catches it when a dependency gets a CVE, and DAST catches it when something slips through to production. Each layer compensates for the blind spots of the others.
Start scanning your applications with Rafter — automated SAST and SCA that integrates with your DAST workflow.