Cloudflare WAF vs. AWS WAF - which is better for a 100% AWS shop?

I'm a community manager for a SaaS company, our platform runs on AWS with an ALB and we've tested both WAFs in production. Right now we're using AWS WAF, but I ran a Cloudflare pilot for six months.

Here's how I'd break down the real differences:

1. **Setup and ongoing rule management**
AWS WAF setup is a series of manual steps in the console or CloudFormation, and rule management feels like editing a config file. Cloudflare's dashboard is significantly more intuitive for non-specialists; you can have a basic managed ruleset deployed in under 5 minutes. The downside is it's another control plane outside AWS.

2. **Performance impact on your AWS bill**
AWS WAF charges per rule and per million requests. For moderate traffic, this can be $20-50/month. Cloudflare's WAF is part of their Pro plan ($20/month per site). However, if you enable Cloudflare's proxy, your ALB will see traffic from Cloudflare IPs, which can reduce your data transfer out costs from AWS. In our case, that saved us about 15% on our AWS bill.

3. **Security efficacy and false positives**
Cloudflare's managed rule sets, especially their proprietary ones, updated faster during zero-day events we monitored. Their OWASP Core Rule Set tuning felt more straightforward. AWS's managed rules were effective but we spent more time tuning out false positives for our legacy app, often requiring custom rule writing.

4. **Lock-in and ecosystem fit**
You're 100% AWS. AWS WAF integrates with AWS Shield for DDoS, and logging to S3/CloudWatch is automatic. Investigations flow within one console. Adding Cloudflare introduces a separate DNS layer, SSL certificate management, and another place to check logs. For a small team, that context switching adds real overhead.

My pick is to stick with AWS WAF if your team is small and your apps are fairly standard. The integration and single-console benefit is real. Only consider Cloudflare if you're hitting scaling issues with the ALB, need more granular bot management, or want to optimize those data transfer costs. To decide, tell us your monthly AWS data transfer out cost and whether you have someone dedicated to security tuning.

Cloudflare's dashboard advantage is real. But for a pure AWS shop, you lose integration with CloudTrail and GuardDuty that AWS WAF provides. If you have DevOps automating via CloudFormation, AWS WAF becomes manageable.

On performance, Cloudflare can reduce your AWS data transfer costs by acting as a reverse proxy, but it adds another hop. AWS WAF runs inline on your ALB, so latency is a wash for most apps.

Cost-wise, you need to model it. For moderate traffic, Cloudflare's fixed-price tiers often beat AWS WAF's per-request metering. But you're trading AWS's granular billing for a simpler, possibly cheaper, external bill.

You're asking the right question, and being 100% on AWS does change the calculus. The integration with CloudTrail, GuardDuty, and IAM is a tangible benefit for a consolidated security posture that shouldn't be dismissed just for a nicer dashboard.

If your team is already comfortable managing infrastructure as code, AWS WAF's integration with CloudFormation can make ongoing rule management more of an operational process than a daily chore. However, I'd argue the cost question is where you should focus your analysis.

For moderate traffic, Cloudflare's fixed-price Pro plan, which includes the WAF, can indeed be cheaper than AWS's per-request metering. But you have to account for the hidden cost of context switching between two platforms and the potential latency of routing your traffic outside AWS and back. A simple spreadsheet comparing your current AWS WAF bill against Cloudflare's fixed price, while adding a 10-15% buffer for the extra data transfer out of AWS, usually clarifies the decision.