OWASP Zap and PortSwigger Burp Suite Pro have many similar features. OWASP Zap has web application scanning available with basic security vulnerabilities while Burp Suite Pro has it available with quality security vulnerabilities. Both are very comparable in terms of intercepting features, fuzzing capabilities, and encoder and decoders. Both OWASP Zap and PortSwigger Burp Suite Pro have a spider feature, and provide updates.
One big difference between the two, though, is price. OWASP Zap is free, but Burp Suite Pro requires a paid subscription (currently $399 per year). OWASP Zap is maintained by volunteers whereas Burp Suite Pro is a commercial product maintained and sold by PortSwigger, which makes me feel more confident in it. In addition, OWASP Zap provides little documentation, which may be why some people prefer Burp Suite Pro (which offers extensive documentation). Moreover, Burp Suite Pro includes more coverage than OWASP Zap. But it is also worth noting that OWASP Zap has more false positives than Burp Suite Pro.
I like Burp Suite Pro’s interface a lot more than OWASP Zap’s. Another big plus for me with Burp is its Comparer tab,which allows for easier change detection. OWASP Zap does not include this feature without extensions and a ZAP plugin is required. Another thing about OWASP Zap I dislike is that the ability to search for text in the request or server response is difficult, while Burp Suite Pro makes it easier and more accessible.
Conclusion: In my opinion, Burp Suite Pro is better than OWASP Zap because of its features, which I feel make it a better choice for security professionals. Both OWASP Zap and Burp Suite Pro have good sets of capabilities. However, Burp Suite Pro excels in the specific capabilities I need in more ways that OWASP Zap does.
First things first both are having their own merits, however in my personal experience ZAP can replace your burpsuite for sure considering the License. Also as the latest ZAP versions are covering more advanced techniques and spidering patterns with lots of options in it, it is worth considering ZAP. However remember that burpsuite from latest versions with inbuilt chromium and it's emerging plugin support (Installable jars) you can use burp to the fullest and you can keep it as a swiss knife for your web and app pentesting. Couple of extensions in burp pro are interesting especially the race condition one. I always prefer using Burp and at instances I go with ZAP.
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