Thomas could give you better numbers here, but in general, appsec reviews cost as much as getting software development done. (i.e. For a security review worth

Thomas could give you better numbers here, but in general, appsec reviews cost as much as getting software development done. (i.e. For a security review worth the paper you print the report on, you're looking at $5k at the lower end if your application is simple or if someone wants to really do you a favor, and they get substantially more expensive than that. You can get someone to run an automated scan for $500 and give you a CSV file, but that is not maximally in your interests.) I'd turn away any client who asked me to do appsec work, because I don't think I'd produce work of a sufficient quality to justify the sort of rates I charge, but I do think I'm probably good enough to roughly scope appsec projects on technologies I understand well. Example: Appointment Reminder is an architecturally simple Rails application. I think an audit of the marketing site, application, and architecture would reasonably require probably 1 to 2 billable weeks depending on how much I asked you to plumb e.g. line-by-line HIPAA requirements, and that would probably run in the $4k to $12k region based on my understanding of prevailing rates for appsec work. (I'm sure that if I had $25k budgeted for that audit many firms could find a way to get me my money's worth for every penny of that budget, by the way.)