Visibility in this ranking can be paid for. Payment moves a vendor's position within the
shortlist; it never adds a vendor, and it never changes a word of the review. The largest vendors in web application firewall
cannot hold places 1 to 3. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category,
wherever the category has them; the established names follow from place 4 in their ranked order. How it works: placement disclosure ·
editorial process.
The 12 tools, reviewed
#1 Sucuri
Cloud firewall plus malware cleanup for small sites · United States · sucuri.net
Small business Cloud WAF Cleanup included
Sucuri is the one product here built around the owner who has been hacked once and does not want it to happen again.
- Pricing: Per site / month. Per-site subscriptions with monthly prices published on the signup page, starting under $10 a month, with a discount for terms longer than one year. Free plan: none.
- Best for: Small sites without a security team
- Strengths: Cloud web application firewall; Global anycast CDN; Smart caching options.
Where it falls short
The firewall is a proxy layer you point DNS at, so it protects only what sits behind that hostname, and it gives you little to tune compared with enterprise tools.
Wrong for
Teams running many APIs, microservices or an on-premises estate, and anyone needing custom rule logic per route.
Visit Sucuri →
#2 BunkerWeb
Open-source WAF with paid support, from France · France · bunkerweb.io
Open source EU vendor Self-hosted
BunkerWeb is the only entry here that combines an open core with a company that publishes a registered French address and flat euro prices for support.
- Pricing: Open source + paid tiers. Free open-source edition under AGPLv3; PRO plans listed at 49 euros and 149 euros a month; managed cloud from 639 euros a month. Free plan: open source.
- Best for: Teams wanting a self-hosted, EU-run WAF
- Strengths: Open-source WAF; Linux, Docker and Kubernetes install; 40+ plugins.
Where it falls short
You operate the thing yourself on the free and self-hosted tiers, which means upgrades, rule tuning and log handling are your job. Vendor support starts at the paid tiers; the free edition leans on the community.
Wrong for
Companies with no one who can run a reverse proxy, and buyers who need absorption of very large volumetric attacks.
Visit BunkerWeb →
#3 Barracuda WAF
WAF as a product or as a hosted service · United States · barracuda.com
Mid-market Hosted or deployed API protection
Barracuda is the pick for a company that has one application in a data center and another in a public cloud and wants a single vendor for both.
- Pricing: Quote only. Plans selected through a see-plans and build-and-price flow rather than a public rate card; no entry price is shown on the product page. Free plan: none.
- Best for: Mid-sized firms wanting one vendor, two models
- Strengths: Web application firewall; WAF-as-a-Service; API protection.
Where it falls short
Prices are not public on the product page, so you cannot compare it with Cloudflare or AWS without a conversation.
Wrong for
Single-site owners wanting a flat monthly bill, and teams that live entirely in one cloud.
Visit Barracuda WAF →
#4 Cloudflare WAF
Edge WAF with managed rules on every plan · United States · cloudflare.com
Edge WAF Free plan Major vendor
Cloudflare is where most teams should start, and where many stay. The firewall runs in front of a site once DNS points to it, a managed ruleset is on the free plan, and the published ladder goes from $0 to $20 and $200 a month before an enterprise contract.
- Pricing: Flat monthly + enterprise contract. Free at $0; Pro $20 a month billed annually ($25 monthly); Business $200 a month billed annually ($250 monthly); Enterprise is custom, billed annually. Free plan: free plan.
- Best for: Anyone starting with a free or cheap tier
- Strengths: Managed rulesets; Custom rules; Rate limiting rules.
Where it falls short
The free and Pro tiers carry a lighter feature set than Business and Enterprise, so the sticker price can understate a serious deployment. Rules in the dashboard are broad and shallow for application-specific logic.
Wrong for
Regulated firms that must run the inspection engine inside their own network, and teams that need per-application learned policies.
Visit Cloudflare WAF →
#5 AWS WAF
Pay-as-you-go firewall attached to AWS services · United States · aws.amazon.com
AWS native Usage-based Major vendor
AWS WAF is the sensible choice when the application already lives on AWS, since a web ACL attaches to the front door you already use and the cost is metered rather than contracted. The pricing page lists $5 per web ACL, $1 per rule and $0.60 per million requests, with managed rule groups, including ones sold by third-party sellers, as add-ons.
- Pricing: Usage-based. $5 per web ACL per month, $1 per rule or managed rule group per month, and $0.60 per million requests. Free plan: none.
- Best for: Teams already running on AWS
- Strengths: Web ACLs; Managed rule groups; Custom rules.
Where it falls short
The bill has many dials: web ACLs, rules, rule capacity units, body-inspection size and bot add-ons each bill separately, and the total is hard to predict before traffic arrives.
Wrong for
Anyone hosting outside AWS, and buyers who want a single predictable monthly figure.
Visit AWS WAF →
#6 Azure Web Application Firewall
WAF built into Azure Application Gateway and Front Door · United States · azure.microsoft.com
Azure native Regional or global Major vendor
Azure WAF is a firewall policy more than a product you buy on its own. It attaches to Application Gateway for regional traffic or to Front Door for global traffic, and the Front Door Premium tier includes it in the service price. For a company already managing Azure subscriptions, identity and logging in one tenant, that integration is the whole argument.
- Pricing: Usage-based. Priced with the host service: Front Door Premium includes it. Free plan: free trial.
- Best for: Microsoft-centric shops running on Azure
- Strengths: Application Gateway integration; Front Door integration; Managed rulesets.
Where it falls short
Costs depend on which host service you pick, and the Application Gateway and Front Door tables use different units, so budgeting takes a calculator. It protects Azure-fronted apps only.
Wrong for
Anyone hosting mainly outside Azure, and teams without a person who understands Azure networking.
Visit Azure Web Application Firewall →
#7 Imperva Web Application Firewall
Cloud and on-premises WAF, now part of Thales · United States · imperva.com
Hybrid deployment Enterprise Thales company
Imperva is the choice when applications sit in a data center and in two clouds and one team has to cover them all. Its page offers the firewall in public or private cloud, hybrid and on-premises setups, with managed rules written by its own research team and policy creation that is automated. A free trial lets you test block mode before signing.
- Pricing: Quote only. Quote-based pricing; a free trial and a demo tour are offered on the product page. Free plan: free trial.
- Best for: Larger firms with hybrid estates
- Strengths: Web application firewall; Cloud and on-premises deployment; Automated policy creation.
Where it falls short
No public prices, and a sales-led purchase for most plans. The product family is wide, with separate consoles for cloud and RASP, so the package you need can take time to define.
Wrong for
Small sites and teams wanting a self-serve, published price, or anyone who needs to be live this week.
Visit Imperva Web Application Firewall →
#8 F5 WAF for BIG-IP
Enterprise WAF for BIG-IP environments · United States · f5.com
Enterprise BIG-IP Declarative policy
F5 is the strongest fit where traffic already passes through BIG-IP and a team exists to run it. The product page describes a learning engine, customized policy building, a compliance dashboard for OWASP Top 10 and a declarative policy that fits a CI/CD pipeline.
- Pricing: Quote only. Sold through F5 sales, resellers and subscriptions; no price shown on the product page. Free plan: none.
- Best for: Enterprises already running BIG-IP
- Strengths: Web application firewall; Learning engine; Guided configurations.
Where it falls short
This is a heavy product to buy and operate: licensing, deployment and tuning take real engineering time, and the cost is far above cloud WAF subscriptions. The product naming has moved over the years, which complicates research.
Wrong for
Small and mid-sized firms without network engineers, and cloud-only startups.
Visit F5 WAF for BIG-IP →
#9 FortiWeb
WAF as appliance, VM, SaaS or marketplace image · United States · fortinet.com
Appliance or SaaS Fortinet ML-based
FortiWeb earns its place for networks already built around Fortinet firewalls. The vendor page says it is offered as hardware, virtual machines and SaaS and in public cloud marketplaces, and it applies machine learning to model each application and cut false positives. It also covers API discovery and bot mitigation.
- Pricing: Quote only. Quote-based; the product page offers a free demo and lists hardware, VM and SaaS forms. Free plan: none.
- Best for: Fortinet-standardized networks
- Strengths: Web application firewall; Hardware, VM and SaaS forms; Public cloud marketplace images.
Where it falls short
A free demo is offered, but pricing sits behind sales, and the range of models and licenses makes sizing a project of its own. Without Fortinet gear elsewhere, you lose the integration argument.
Wrong for
Teams wanting a simple, hosted, set-and-forget service with no appliance sizing.
Visit FortiWeb →
#10 Fastly Next-Gen WAF
WAF for apps and APIs, deployable anywhere · United States · fastly.com
API protection Engineering-led Deploy anywhere
Fastly suits developer-heavy teams that run services in several places and want one firewall policy across them. The page says the Next-Gen WAF covers applications, APIs and microservices wherever they live, aims at protection beyond injection-style attacks, and avoids the tuning that plagues rules-based firewalls. Fastly also sells bot management, DDoS and API security as separate modules on its pricing page.
- Pricing: Quote only. Pricing is by contacting sales; the pricing page lists no figure for the WAF. Free plan: none.
- Best for: Engineering-led teams with APIs
- Strengths: Next-gen web application firewall; App, API and microservice protection; Deployment anywhere.
Where it falls short
No published price, so a small team cannot budget before talking to sales. The WAF is one module among several, so bot, API and client-side protection are separate conversations.
Wrong for
Non-technical site owners and anyone wanting a published monthly figure up front.
Visit Fastly Next-Gen WAF →
#11 Wallarm
WAAP with strong API discovery · United States · wallarm.com
API security WAAP Developer-focused
Wallarm is the right look for a team whose real exposure is the API surface, not the marketing site. Its documentation describes API discovery, detection of shadow and orphan APIs, API abuse prevention and security testing alongside the WAAP, and it publishes open-source projects. A try-for-free option lowers the barrier to a proof of concept.
- Pricing: Quote only. Quote-based; a try-for-free button and demo appear on its site, with no list prices seen. Free plan: free trial.
- Best for: API-first product teams
- Strengths: Web application and API protection; API discovery; API security testing.
Where it falls short
Prices are not public and the product is organized around API security, so a small team protecting a brochure site buys more than it uses.
Wrong for
Owners of simple websites and teams needing on-premises hardware in their own racks.
Visit Wallarm →
#12 ModSecurity with OWASP CRS
Free open-source WAF engine and rules · United States · modsecurity.org
Open source Self-built Rule set
ModSecurity is where WAFs began and still the base layer of many products. Its site calls it the most widespread open-source WAF, a module that gives visibility into HTTP(S) traffic and a rules language, and the OWASP Core Rule Set supplies generic attack detection aiming at few false alerts. It costs nothing to license and it lets you read every rule.
- Pricing: Open source. Free and open source; the cost is the staff time to deploy, tune and update it. Free plan: open source.
- Best for: Teams with in-house sysadmins
- Strengths: Open-source WAF engine; Rules language and API; OWASP Core Rule Set.
Where it falls short
There is no dashboard, no vendor support, no managed rules and no DDoS cover. Rule updates, such as the recent CRS security fixes, are yours to apply, and false positives are tuned by hand.
Wrong for
Companies without in-house Linux and web server expertise.
Visit ModSecurity with OWASP CRS →
What the data says about this market
The market splits into cloud proxies, cloud-provider features, appliances and open source, and this list has examples of each. Of the 12 products ranked, 11 are from US-based publishers and one, BunkerWeb, from France. Only a minority publish prices for the WAF itself: Cloudflare, AWS, Azure, Sucuri and BunkerWeb do, while Imperva, F5, FortiWeb, Fastly, Barracuda and Wallarm sell through contact forms. Three products offer a no-cost entry, Cloudflare's free plan and the open-source ModSecurity and BunkerWeb editions, and two more, Imperva and Wallarm, advertise a free trial. Consolidation is visible in the sellers' own pages.
More in our report The Global Shift to ICT Services, on market data and in all industry reports.
Questions and answers
What is the best web application firewall in 2026?
Sucuri ranks first of 12, best for small sites without a security team. BunkerWeb is second (teams wanting a self-hosted, EU-run WAF) and Barracuda WAF third (mid-sized firms wanting one vendor, two models). Places 1 to 3 go to challengers, vendors outside the best-known brands, wherever the category has them.
Do I need a WAF if my site already has HTTPS and a login system?
Yes, because HTTPS protects the connection, not what a request contains. A firewall inspects the content of requests for injection strings, known exploit patterns and abusive automation.
What is the difference between a WAF and a network firewall?
A network firewall decides which ports and addresses may talk to each other. A WAF works at the application layer and reads the HTTP request itself, including URLs, headers, cookies and body.
Is a free WAF good enough?
For a personal site or a small business with modest risk, Cloudflare's free plan with its managed ruleset is a reasonable start, and BunkerWeb or ModSecurity cost nothing in license fees.
How long does it take to deploy a WAF?
A cloud proxy can be live in front of a site in an afternoon once DNS is changed, but a sensible rollout in monitor mode takes one to two weeks.
Will a WAF slow my website down?
A well-placed one adds little. Cloud proxies that include a CDN, such as Sucuri and Cloudflare, can make pages faster through caching and compression, which Sucuri's platform page lists among its features.
Can a WAF stop bots and scrapers?
Basic WAFs block known bad signatures, but sophisticated bots need a separate bot product.
What are false positives and how do I handle them?
A false positive is a legitimate request the firewall blocks, such as a customer pasting an apostrophe into a form that looks like SQL.
Does a WAF help with PCI DSS?
Payment-card rules call for protecting public-facing web applications, and a WAF is a common way to meet that requirement. Cloudflare lists PCI DSS 4.0 compliance in its plan comparison.
Should I choose a cloud WAF, an appliance or open source?
Choose a cloud service when you want speed, no hardware and a published price. Choose an appliance or virtual appliance when inspection must stay inside your own network or you already run BIG-IP or Fortinet.
What happens to my rules if I switch vendors?
Most rules do not transfer. Each vendor has its own syntax for custom rules, exceptions and rate limits, so expect to rebuild and retest. ModSecurity-style rules are the most portable, since several engines read them.
