DDoS Testing Vendors: How to Choose One
The DDoS testing market is small, and the companies in it are doing genuinely different jobs behind similar language. Vendors, companies, providers, suppliers: the market uses these interchangeably and so does this page. What follows is what actually separates them, what to ask before you sign, and where the cloud platform authorization rules bite. Written to be useful whether or not you end up talking to us.
The four kinds of DDoS testing provider
Most shortlists mix these together, which is why the quotes look incomparable. They are not competing offers. They are different products.
Automated scanning tools
Read your configuration from public data and report how you are set up. No attack traffic, so no load is ever applied. Useful as a free first look, and genuinely informative about origin exposure, DNS and whether protection sits in the path. They cannot tell you what happens under pressure, and a vendor presenting one as a test is misrepresenting it.
Self-service test platforms
Provide the traffic and leave the judgement to you: what to test, which vectors matter, how to read the output, what to fix. That suits large organizations and cloud providers with their own testing teams. Worth establishing how self-service the platform truly is, because several sold that way still need vendor hands on the controls.
Managed testing companies
Run the engagement for you: scoping, execution, findings, and usually the remediation work and a retest. You are buying expertise as much as traffic. This is where the established names sit, and where most regulated organizations end up, because someone has to be accountable for the result.
In-house testing
Viable if you already employ people who do this. The constraint is rarely tooling; it is that the team who built the defences is the least able to see their blind spots, and that cloud platform policies still apply to your own traffic.
Six questions that separate DDoS testing companies
Every vendor will say they test your defences. These are the questions whose answers actually differ, including ours.
Do they test what you actually run, or what their platform supports?
Ask how the test changes if your estate includes an API tier, DNS, a hybrid on-premise seam or a gaming workload. A vendor whose answer is the same regardless of your architecture is selling a package, not a test. The scope should be argued with you, not read off a price list.
Do the vectors run simultaneously, or one after another?
A sequential run tells you each defence works in isolation. Real attacks arrive together, and defences interact: rate limiting behaves differently when the connection table is already under pressure. Sequential testing is legitimate and cheaper, but it answers a smaller question, and the difference is rarely explained on a vendor website.
Does the test adapt while it runs?
A scripted test replays a fixed plan whatever your defences do. An adaptive one changes vector, rate and source distribution in response, the way an attacker does when the first approach stops working. This is the single largest difference in what a result means, and it is the hardest thing to build.
Who reads the result, and what do you get?
A raw results file is not a finding. Ask whether you receive prioritized remediation, whether an engineer walks your team through it, and whether a retest proving the fix is included or quoted separately. Many quotes that look similar differ entirely on this line.
Are they independent of the mitigation vendors?
A tester with a commercial relationship to a protection provider has an obvious incentive when the finding is "your provider let this through". Ask directly. Independence is easy to state and easy to verify.
What do they refuse to do?
A serious vendor will decline work: testing assets you cannot prove you own, exceeding a platform policy, or running a volume your architecture cannot survive. A vendor who agrees to everything is telling you how the engagement will go when something breaks.
The authorization question most shortlists miss
Cloud platforms govern simulated DDoS separately from ordinary penetration testing. On AWS, high-volume simulated attacks generally require an approved DDoS Test Partner or advance authorization once traffic passes defined thresholds, because the platform cannot tell your authorized test from a real attack. Azure runs a comparable regime. Policies change, so the durable instruction is procedural: confirm the current position with the platform before anyone generates a packet.
Two things follow. Written authorization from whoever owns the assets is mandatory regardless of what the platform permits, and it is the vendor’s job to insist on it rather than yours to remember. And the platform rules are a real constraint on who can run what, which is worth establishing early rather than after a procurement cycle.
None of this should land on you. Confirming what the current policy requires for your planned volume, and securing whatever approval that involves, is part of scoping a test properly. It is worth asking any vendor to describe how they handle it, because a clear answer tends to predict how the rest of the engagement runs. Read more in our guides to AWS DDoS testing and Azure DDoS testing.
Common questions about choosing a vendor
What is the difference between a DDoS testing vendor and a penetration testing vendor?
Penetration testing looks for a way in: a flaw that grants access. DDoS testing assumes no way in is needed and asks whether the service stays available when traffic becomes hostile. The skills, the tooling and the risk profile all differ, and most penetration testing firms do not run DDoS simulations. A vendor offering both should be able to explain how their DDoS methodology differs from their pen-test methodology; if the answer is vague, it usually means a load-testing tool pointed at your site.
Do I need an AWS or Azure approved vendor to run a DDoS test?
For high-volume simulated attacks on those platforms, generally yes. AWS governs simulated DDoS separately from standard penetration testing, and beyond defined thresholds it requires an approved DDoS Test Partner or advance authorization, because the platform cannot distinguish your authorized test from a real attack. Azure operates a comparable regime. The policies change, so confirm the current position with the platform before any engagement, and get written authorization from whoever owns the assets regardless. That authorization is mandatory whatever the platform allows.
Who handles the platform authorization, us or the vendor?
The vendor should. Establishing what the current policy requires for your planned volume, securing whatever approval that involves, and holding written authorization from whoever owns the assets are all part of scoping a test properly, not paperwork to hand back to you. Ask a prospective vendor to describe their process for it. A clear answer is a good indicator of how the rest of the engagement will run.
How many DDoS testing companies are there?
Very few that do only this. The category is small: a handful of specialists, several security consultancies who offer it alongside penetration testing, the test-equipment manufacturers, and a growing set of automated platforms. That is worth knowing when a shortlist looks long, because many names on it are reselling or subcontracting.
Should I choose a vendor by price?
Only after establishing that the quotes describe the same job, which they usually do not. The variables that move a quote are scope, whether vectors run simultaneously, how many windows, and whether remediation and a retest are included. Two quotes differing by a factor of five often describe genuinely different work. There is more on this in our breakdown of what drives DDoS testing cost.
What should a vendor deliver at the end?
A resilience result you can act on and evidence you can show: what held, what did not, at what point mitigation engaged, what it let through, and what to fix in priority order. If a report cannot be handed to an engineer as a work list and to an auditor as evidence, it is not finished.
Where we fit
We are an independent testing company, tied to no mitigation vendor. If a straightforward sequential test is what your requirement calls for, we run those too. And when you need a higher level of sophistication, simultaneous multi-vector testing that adapts in real time to your defences rather than replaying a script, that is what we were built for and it is Patent-Pending. Either way, the scope follows what you actually need to prove.