Static vs Dynamic Application Security Testing
SAST vs DAST: what's the difference?
SAST reads your source code and finds flaws at their root. DAST attacks the running app and proves which flaws are actually exploitable. You need both - and TurboPentest runs both in a single pentest, then validates every finding with an AI agent. From $99 per target.
See a sample report →The short version
SAST reads the code. DAST attacks the app. Static analysis inspects source code at rest to find root-cause weaknesses with a file and line. Dynamic testing throws real requests at the deployed application to prove what an attacker can actually exploit. Each catches what the other misses, so a mature program runs both.
SAST
static - reads source code, finds root-cause flaws with file + line
White-box
DAST
dynamic - attacks the running app, proves real exploitability
Black-box
Both
one TurboPentest run combines SAST + DAST, AI-validated
$99 per target
What is SAST (static application security testing)?
SAST analyzes your application's source code without running it. It parses the code and traces how untrusted input flows from where it enters the program to dangerous sinks - a database query, a shell command, an HTML response - to find vulnerabilities at their root: SQL injection, cross-site scripting, insecure deserialization, path traversal, hardcoded secrets, weak crypto, and insecure configuration.
Because it reads the code directly, SAST reports the exact file and line, so a fix is a concrete code change rather than a guess. It runs early - on a commit, a pull request, or in CI - before anything ships, and it covers every path in the codebase, including code that is not yet reachable from outside.
The trade-off: SAST reasons about code, not runtime, so it cannot confirm a finding is actually exploitable on the live system, and it can produce false positives. That is why raw scanner output needs triage - and why TurboPentest pairs its rule pack with an AI validator.
What is DAST (dynamic application security testing)?
DAST tests your application while it is running, from the outside, exactly as an attacker would. It sends crafted requests at live endpoints and watches how the app responds - injecting payloads, tampering with parameters, probing authentication and access control - to find vulnerabilities that are actually reachable and exploitable: reflected and stored XSS, SQL injection that really fires, authentication bypass, security misconfiguration, and exposed services.
DAST needs no source code - just a reachable URL - so it works on any technology stack and any language. When it flags something, it comes with proof: the request, the parameter, and the response that demonstrate the exploit. That makes DAST findings hard to dismiss as false positives.
The trade-off: DAST can only test what it can reach. Code behind a feature flag, an unauthenticated blind spot, or a path it never exercises stays invisible, and when it does find an issue it rarely points to the root cause in the code. That is the gap SAST fills.
SAST vs DAST: side by side
The same difference between static and dynamic application security testing, across the dimensions that matter when you choose an approach.
Why you need both - and how TurboPentest runs them together
SAST finds a flaw in the code but cannot prove it is reachable. DAST proves an exploit but cannot tell you which line to fix. Run them separately and you get two disconnected reports. TurboPentest runs both in one pentest and lets the Paladin AI connect them - so a source-code finding arrives already checked against live behavior.
Black-box DAST runs on every pentest
OWASP ZAP, Nuclei, Nikto, and more attack your live application from the outside - no source code required - to prove what is actually exploitable.
Connect a GitHub repo to add white-box SAST
Opengrep scans your source read-only with 325+ IntegSec rules across 7 languages, each mapped to CWE, OWASP, and ASVS, finding root-cause flaws with file-and-line precision.
Paladin AI validates across both layers
The AI cross-checks each candidate finding, confirms exploitability, drops false positives, and classifies source-code findings to an OWASP ASVS level.
One report, both perspectives
Findings with file-and-line locations and live proof-of-concept, remediation, Fix with AI prompts, a STRIDE threat model, and retest commands - all for $99 per target.
Keep reading
Go deeper on either half of the test, or compare the leading static-analysis tools.
SAST vs DAST FAQ
What is the difference between SAST and DAST?+
SAST (static application security testing) analyzes your source code without running it, tracing how untrusted input flows through the code to find root-cause flaws and reporting the exact file and line. DAST (dynamic application security testing) attacks your running application from the outside, sending real requests to prove which vulnerabilities are actually exploitable. In short: SAST reads the code, DAST attacks the app. SAST finds the flaw, DAST proves it.
Do I need both SAST and DAST?+
Yes, for meaningful coverage. SAST gives you full code coverage and points straight at the fix, but it cannot confirm a finding is reachable on the live system and can raise false positives. DAST proves real exploitability but misses code paths it cannot reach and rarely explains the root cause. Together they cover each other's blind spots - which is why TurboPentest runs both in a single pentest and uses its Paladin AI to cross-validate the findings.
Is SAST or DAST better?+
Neither is strictly better - they answer different questions. SAST is better for catching flaws early and cheaply with a file-and-line fix, including code that is not yet reachable. DAST is better for proving what an attacker can actually exploit today, with no source code required. The strongest programs run both, which is exactly what TurboPentest does in one run.
What about IAST?+
IAST (interactive application security testing) instruments the running application from the inside, combining aspects of SAST and DAST by watching code execute during dynamic tests. It can reduce false positives, but it requires agents deployed into the runtime and language-specific support, which adds operational overhead. TurboPentest achieves a similar result differently: it runs true SAST and true DAST in parallel and lets the Paladin AI validate each source-code finding against live behavior, so you get exploit-aware results without instrumenting your runtime.
Does TurboPentest do both SAST and DAST?+
Yes. Every TurboPentest run includes black-box DAST (OWASP ZAP, Nuclei, Nikto, and more) against your live app. Connect a GitHub repo read-only and it adds white-box SAST via Opengrep with 325+ rules across 7 languages. The Paladin AI then validates each candidate finding across both layers. All of it is $99 per target, flat.
Stop choosing. Run SAST and DAST together. $99.
Connect a repo and get white-box SAST plus a live black-box pentest in one run, every finding AI-validated. See pricing
Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.