A web application firewall inspects HTTP traffic before it reaches your application and drops the requests that look like attacks.
This guide ranks them on where they sit relative to your origin, what tuning costs in engineer hours during the first ninety days, how the bill behaves under a traffic spike, and how hard the rules are to take elsewhere.
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vendor. How that works.
In short
What web application firewall software does
A web application firewall filters incoming HTTP requests against rules for injection, scripting and abuse, blocking or logging the ones that match before the application sees them.
In this order: setup effort, what it really costs, how your data comes back out, whether
you can leave, and who each web application firewall tool is built for. Why those five, and why there is no
score out of ten, is on the how we work page.
Large sites where an outage is measured in lost revenue per minute
A single application without a dedicated security team
Country is where the vendor is headquartered or contracts from, which is a
different question from where your data is hosted. Where the two tell different stories, the
entry says so.
BunkerWeb packages nginx, the OWASP Core Rule Set and a set of hardening defaults into something a systems administrator can deploy and read. No traffic leaves your infrastructure, no per-request bill, and the configuration is yours to keep.
What it cannot do is absorb a volumetric attack, because the bandwidth being flooded is still yours. Expect to spend the saved licence money on the weeks of tuning that a managed service would have done for you.
What stands out
Open source
Self-hosted
No traffic detour
Where it costs you
No network in front of you, so volumetric attacks still land
Core Rule Set tuning is entirely your own work
Right for
Self-hosted stacks that must keep traffic inside their own network
Wrong for
Teams without anyone comfortable operating nginx in production
FranceFree and open source; PRO plans from 49 euros a month and a managed cloud from 639 euros a month, published
EU-headquartered edge network with application filtering attached
Ranked #2 of 13 in Best Web Application Firewall in 2026.
Free tierPublished pricingEurope
Gcore WAAP is the credible European answer to Cloudflare WAF: a Luxembourg-headquartered provider with its own network selling application filtering, bot management and DDoS protection in one plan, with a free tier and a published entry price.
The technology is a generation behind on the parts that matter during tuning, namely the quality of the logs and the explanation of what a rule matched. Run a paid pilot on real traffic before moving anything important onto it.
What stands out
EU vendor
Free plan
Published entry pricing
Where it costs you
Rule tuning and analytics trail the American edge providers
Documentation gaps show up during the first real incident
Right for
Buyers who need the contracting entity established inside the EU
Wrong for
Teams that want mature rule analytics and deep request logs
LuxembourgFree plan for one domain; paid plans from 25 euros a month, published; enterprise quoted
Managed rule tuning included rather than sold as a service
Ranked #3 of 13 in Best Web Application Firewall in 2026.
Published pricingAsia-Pacific
Indusface AppTrana bundles the scanner and the analyst with the firewall, so findings become virtual patches without anyone on your side writing a rule. For a team of three that is the difference between blocking mode on and blocking mode off.
The entry plan is published per domain, which keeps the comparison honest, though Premium and Enterprise are quoted. You give up immediacy: an urgent rule change is a support ticket, and the console is built for reporting rather than for daily work.
What stands out
Managed tuning
Published entry pricing
Scanner included
Where it costs you
Rule changes happen on the vendor's support clock
Edge network is smaller than the American providers
Right for
Small security teams that will never tune rules themselves
Wrong for
Teams needing instant self-service control over every rule
IndiaAdvanced plan 99 US dollars per domain per month, published; Premium and Enterprise quoted
German-run edge network combining DDoS protection and application filtering
Ranked #4 of 13 in Best Web Application Firewall in 2026.
Published pricingEurope
Link11 comes from volumetric DDoS protection, which is still where it is strongest, and has added application rules, bot management and caching on top. For a European buyer the point is the contracting party: a German company running the service from Europe.
Core and Advanced plans are self-onboarded with published prices and rules you manage yourself; the enterprise tier adds managed onboarding and custom protections at a quoted price. Outside Europe its network has fewer locations than the American edge providers.
What stands out
German vendor
DDoS and WAF
Self-serve plans
Where it costs you
Entry WAAP plan costs 490 euros a month on annual billing
Less self-service rule control than Cloudflare WAF
Right for
European companies needing DDoS protection and a WAF under German jurisdiction
Wrong for
Small sites that want a free or low-cost entry tier
GermanyPer plan per month, published; enterprise quoted
German-operated filtering for regulated and critical infrastructure
Ranked #5 of 13 in Best Web Application Firewall in 2026.
Pricing on requestEurope
Myra Security is chosen for the contract as much as the technology: a German operator with the certifications that critical-infrastructure and public-sector auditors ask for by name.
Rules can be edited in the dashboard or through the API, and a managed WAF add-on hands the rule writing and tuning to Myra's analysts, which suits organisations with no application security engineer. Outside Europe the network is smaller than the American providers, so global latency needs checking against your own user map.
What stands out
German operation
BSI certified
Managed option
Where it costs you
Quote-only, with no published entry price
Network footprint is small outside Europe
Right for
German regulated operators who must name a domestic provider
Wrong for
Teams wanting a published price and a self-serve sign-up
French application protection with an on-premise gateway option
Ranked #6 of 13 in Best Web Application Firewall in 2026.
Self-hostablePricing on requestEurope
Ubika carries a long French lineage in application security and sells both a cloud service and a gateway you run yourself, which is the answer when traffic cannot legally leave your infrastructure but you still want a supported product rather than BunkerWeb.
The trade is ecosystem: sparse public documentation, few practitioners outside France, and a quote for every deal. Strong in its home market, an act of faith in Rotterdam or Hamburg.
What stands out
French vendor
On-premise option
EU hosting
Where it costs you
Thin documentation and community outside France
Quoted pricing with no self-serve entry point
Right for
French and EU organisations needing an on-premise or EU-hosted option
Wrong for
Teams that expect to solve problems by searching the internet
Reverse-proxy filtering you can switch on in an afternoon
Ranked #7 of 13 in Best Web Application Firewall in 2026.
Free tierPublished pricingNorth America
Cloudflare WAF is the fastest route from nothing to something: point DNS at it and requests are filtered before they reach your servers. That also describes the commitment, because it now terminates TLS and sees every request in clear text.
Tuning is done in a console with a decent explanation of what matched. Budget for a plan above the entry tier once you want full logs, and keep your origin locked to Cloudflare addresses or the whole thing can be walked around.
What stands out
Published pricing
Self-serve
Global proxy
Where it costs you
Useful rule groups and log retention sit on higher plans
You hand over TLS termination and your DNS front door
Right for
Teams wanting protection live this week without touching the application
Wrong for
Traffic that is contractually forbidden to transit a US provider
United StatesFree plan with basic managed rules and five custom rules; paid plans per domain per month, published; enterprise quoted
Rules attached to the load balancer you already run
Ranked #8 of 13 in Best Web Application Firewall in 2026.
Published pricingNorth America
AWS WAF attaches to CloudFront, an Application Load Balancer or API Gateway, so nothing about your traffic path changes and there is no new vendor in front of the origin. Rules are infrastructure as code, which is the strongest argument for it.
The weakness is ergonomics: diagnosing a false positive means querying logs in Athena, and the managed rule groups from third parties each add a monthly charge plus a per-request one. Costs scale with traffic, not with domains.
What stands out
Pay per request
Infrastructure as code
AWS only
Where it costs you
Rule authoring is low-level and error messages are logs
Managed rule groups bill on top of per-request charges
Right for
AWS applications where the rules belong in Terraform with everything else
Wrong for
Teams without an engineer who enjoys reading request logs
United StatesPer web ACL, per rule and per million requests, published
Microsoft rule set attached to Front Door or Application Gateway
Ranked #9 of 13 in Best Web Application Firewall in 2026.
Published pricingNorth America
Azure Web Application Firewall is sold as one product and deployed two ways, and buyers regularly discover the difference late: at Front Door it filters at the edge across regions, on Application Gateway it filters inside your virtual network after your own TLS termination.
Managed rules are Microsoft's Default Rule Set, built on the OWASP Core Rule Set, so the tuning skill is largely portable. Pricing is published and modest until you multiply the hourly gateway charge, or the Front Door Premium base fee, across every environment you keep running.
What stands out
Azure native
Published pricing
Two deployment modes
Where it costs you
Two deployment modes with different rule behaviour and one name
Application Gateway's hourly charge runs even on idle environments
Right for
Applications already behind Azure Front Door or Application Gateway
Wrong for
Anything hosted outside Azure, for any reason at all
United StatesPer gateway-hour plus capacity units on Application Gateway; included in Front Door Premium, published
Ranked #10 of 13 in Best Web Application Firewall in 2026.
Pricing on requestNorth America
Fastly Next-Gen WAF is the clearest example of the beside-the-application model: a module or agent inside your stack, seeing decrypted requests without a third party terminating TLS.
It scores requests on behaviour over time rather than pattern-matching each one, which is why teams here actually run it in blocking mode instead of logging forever. The cost is operational, since the agent has to be installed, updated and monitored everywhere your application runs.
What stands out
Agent or edge
Low false positives
Quote-only
Where it costs you
Agent deployment means an install on every host or container image, unless you use the edge option
Quote-only, with pricing tied to request volume
Right for
Engineering teams that want inspection after their own TLS termination
Wrong for
Small sites wanting protection without touching the deployment
An appliance or virtual machine in front of your own servers
Ranked #11 of 13 in Best Web Application Firewall in 2026.
Self-hostablePricing on requestNorth America
Fortinet FortiWeb is an appliance or virtual machine doing reverse-proxy inspection inside your own perimeter, which is the requirement in plenty of regulated networks. It fits best where the firewall team already runs Fortinet and the same support contract can absorb it.
Quotes are hard to compare because model, throughput and subscription bundles all move, and the anomaly detection needs proving against your own traffic rather than a datasheet before it is trusted in blocking mode.
What stands out
Appliance
On-premise
Fortinet stack
Where it costs you
Licensing across models and support tiers is hard to compare
The interface assumes a network engineer, not a developer
Right for
Data centres that already run Fortinet and cannot proxy externally
Wrong for
Cloud-native teams who want rules in version control
United StatesPer appliance or virtual machine, quoted; cloud option per hour
Long-established proxy filtering, now owned by Thales
Ranked #12 of 13 in Best Web Application Firewall in 2026.
Pricing on requestNorth America
Imperva has one of the oldest and better-tuned rule sets in this market, and the ability to connect application filtering to database activity monitoring is genuinely unusual.
Since the Thales acquisition in 2023 the commercial side has moved, so ask directly who owns your account and what renewal looks like. Deployment is a proxy in front of the origin with the usual TLS consequences, and the whole package is heavy for a team of five.
What stands out
Mature rule set
Database tie-in
Quote-only
Where it costs you
Quote-only and frequently sold through a partner in Europe
Packaging and account teams shifted after the Thales acquisition
Right for
Enterprises wanting one vendor across application and database monitoring
Wrong for
A single application on a modest budget and timeline
The largest edge network, priced and sold like one
Ranked #13 of 13 in Best Web Application Firewall in 2026.
Pricing on requestNorth America
Akamai App & API Protector runs on the largest edge network here, and that is the reason to pay for it: attacks that would saturate a smaller provider are absorbed far from your origin.
The adaptive rules reduce the tuning burden more than any competitor. Everything else is enterprise procurement, from traffic commitments to multi-year terms, and the total lands well above Cloudflare WAF for the same apparent function at small scale.
What stands out
Largest network
Adaptive rules
Enterprise contracts
Where it costs you
Enterprise contracting with traffic commitments and professional services
Console assumes a dedicated security team operating it
Right for
Large sites where an outage is measured in lost revenue per minute
Wrong for
A single application without a dedicated security team
United StatesQuoted per organisation, traffic-based
A web application firewall filters incoming HTTP requests against rules for injection, scripting and abuse, blocking or logging the ones that match before the application sees them. The differences that matter are rarely in the feature list, so this is
the order we would work through them.
01
Decide whether you need a published price
7 of the 13 tools here publish what they cost; the other 6 quote per organisation. The ones you can compare without a sales call: BunkerWeb, Gcore WAAP, Indusface AppTrana, Link11 WAAP, Cloudflare WAF, AWS WAF, Azure Web Application Firewall.
02
Decide how much the jurisdiction matters
These 13 vendors are established in 5 countries across 3 regions (North America 7, Europe 5, Asia-Pacific 1). That decides whose disclosure law applies to what the vendor holds, wherever the servers are.
03
Consider whether you want the source
1 of these are open source: BunkerWeb. Hosting one yourself trades a subscription for maintenance.
In front of the origin, or beside the application
This is the decision, and it is made before any feature comparison. A proxy sits in front of your origin: DNS points at Cloudflare WAF, Gcore WAAP, Myra Security or Akamai App & API Protector, and they terminate TLS, inspect the decrypted request and open a second connection to you. That gives volumetric protection and one place to change rules, at the cost of handing your certificates and every request body to a third party.
Beside the application means a module or agent in your own stack, as with Fastly Next-Gen WAF or BunkerWeb, inspecting requests after your own TLS termination so nothing is decrypted by anyone else. It sees the real client and the real application, but the flood still arrives on your bandwidth.
Write down whether a third party may terminate TLS for this application before comparing vendors.
If you proxy, lock the origin so it only accepts connections from the provider's addresses.
If you run beside the application, name who absorbs a volumetric attack, because the firewall will not.
What the extra hop does to latency, and where it does it
A proxy adds a network hop, and the size of that hop depends on whether the provider has a presence near your users and near your origin. Warm connections to a nearby edge often make pages faster overall; an origin in Frankfurt behind a provider whose nearest node is in Amsterdam adds a round trip to every request. Measure it rather than trusting a coverage map.
Inspection itself is rarely the problem: request body scanning above a few hundred kilobytes and rule sets left at maximum paranoia are, and both are tunable. Myra Security and Gcore WAAP are worth measuring specifically, because their networks are dense in Europe and thinner elsewhere, which is fine until a customer in Singapore complains.
Measure the ninety-fifth percentile from your real user locations, before and after, for a week.
Ask where the nearest point of presence to your origin actually is, by city.
Check the body inspection size limit and what the firewall does with requests above it.
Blocking mode is the only mode that counts
Most web application firewalls in production are logging, not blocking, because someone once blocked a legitimate checkout and the rule set went back to monitor. That is a false positive problem, and it is where products genuinely differ. The OWASP Core Rule Set, used by BunkerWeb and underneath Azure Web Application Firewall's default rules, is transparent and free and will flag your own application's JSON payloads on day one.
Behaviour-scoring products like Fastly Next-Gen WAF, and managed tuning like Indusface AppTrana, exist because tuning is the expensive part. Give it two weeks in monitor mode, tune with real traffic, then turn blocking on per rule group rather than globally.
Run monitor mode for two weeks and count false positives per thousand requests.
Enable blocking rule group by group, starting with the ones that never matched legitimate traffic.
Agree in advance who can disable a rule at three in the morning, and how.
What you can take with you at renewal
Rules do not port. A Cloudflare WAF expression, an AWS WAF JSON statement and a FortiWeb policy are three different languages, and your tuning work is the asset you accumulated. Core Rule Set exclusions transfer between products that use it, which is a quiet argument for Azure Web Application Firewall or BunkerWeb.
Two other things bind you: the DNS cutover, since moving proxies means another change with a real rollback window, and the request logs, which several vendors keep short unless you pay for retention. Export logs continuously into your own storage from day one, and keep a plain-language document of every exclusion and why it exists.
Ship request logs to your own bucket from the start, not just to the vendor's console.
Document every rule exclusion with the reason and the date, outside the vendor's console.
Keep DNS time-to-live short before a migration so a rollback takes minutes, not hours.
What goes wrong most often when buying web application firewall software
Proxying traffic while leaving the origin reachable at its own address. Attackers find the address and the firewall becomes decoration.
Leaving the product in monitor mode indefinitely after one false positive broke a checkout. A firewall that only logs is an expensive log.
Buying on the entry plan price without checking log retention, which is where the real cost of investigating an incident sits.
Forgetting that a proxy terminates TLS. Someone in procurement will ask who can read your request bodies, and the answer should be decided, not discovered.
07
Frequently asked questions
8 answers
What is the best web application firewall in 2026?
BunkerWeb leads our ranking of 13. An nginx build with the OWASP Core Rule Set, bad-reputation blocking and TLS handling wrapped in a configuration layer that a systems administrator can read.
Nothing leaves your network and there is no per-request bill. The cost is yours to pay in time: no global network in front of you, so volumetric attacks still reach your bandwidth, and tuning the rule set is entirely your problem.
Which web application firewall tools publish their pricing?
7 of the 13, with the pricing model each one publishes:
BunkerWeb: Free and open source; PRO plans from 49 euros a month and a managed cloud from 639 euros a month, published.
Gcore WAAP: Free plan for one domain; paid plans from 25 euros a month, published; enterprise quoted.
Indusface AppTrana: Advanced plan 99 US dollars per domain per month, published; Premium and Enterprise quoted.
Link11 WAAP: Per plan per month, published; enterprise quoted.
Cloudflare WAF: Free plan with basic managed rules and five custom rules; paid plans per domain per month, published; enterprise quoted.
AWS WAF: Per web ACL, per rule and per million requests, published.
Azure Web Application Firewall: Per gateway-hour plus capacity units on Application Gateway; included in Front Door Premium, published.
The other 6 quote per organisation.
Is there a free web application firewall tool?
BunkerWeb, Gcore WAAP, Cloudflare WAF offer a free tier or a free self-hosted edition.
Where are these web application firewall vendors established?
In 5 countries across 3 regions: North America 7, Europe 5, Asia-Pacific 1.
BunkerWeb: France.
Gcore WAAP: Luxembourg.
Indusface AppTrana: India.
Link11 WAAP: Germany.
Myra Security: Germany.
Ubika Cloud Protector: France.
Cloudflare WAF: United States.
AWS WAF: United States.
Azure Web Application Firewall: United States.
Fastly Next-Gen WAF: United States.
Fortinet FortiWeb: United States.
Imperva Cloud WAF: United States.
Akamai App & API Protector: United States.
Which web application firewall tools are open source?
BunkerWeb.
Which web application firewall tools can you host yourself?
BunkerWeb, Ubika Cloud Protector, Fortinet FortiWeb. The other 10 are hosted by the vendor only.
What should you use instead of BunkerWeb?
Gcore WAAP and Indusface AppTrana are the next two on this page. Gcore WAAP is for Buyers who need the contracting entity established inside the EU; Indusface AppTrana is for small security teams that will never tune rules themselves.
Who should not buy BunkerWeb?
Teams without anyone comfortable operating nginx in production. No network in front of you, so volumetric attacks still land.
If your web application firewall product belongs among these 13, tell us what it does and who it is for. Inclusion is an editorial call; what a listing is and is not is set out under software advice.
