A keyword that asks for features, pricing, and a verdict is easy to overfill. This review uses a capability ledger instead. Every product claim below is tied to the official introduction, the deploy guide, or the application guide. If a line is missing from those pages, it stays unscored. That rule is what keeps a SafeLine WAF review from turning into a guessed price sheet.
Documented role and feature set
SafeLine is a self-hosted web application firewall. The introduction says it protects web apps by filtering and monitoring HTTP traffic between an application and the Internet, and it describes the deployment as a reverse proxy: clients pass through the WAF before they reach the server (https://docs.waf.chaitin.com/en/home). The application guide states the same model and notes that SafeLine is developed based on nginx. Traffic for the original site is received, malicious traffic is cleaned, and the remaining traffic is forwarded upstream (https://docs.waf.chaitin.com/en/GetStarted/AddApplication).
The introduction names the attack classes this filter is meant to address: SQL injection, XSS, code injection, OS command injection, CRLF injection, LDAP injection, XPath injection, RCE, XXE, SSRF, path traversal, backdoor, bruteforce, HTTP-flood, and bot abuse (https://docs.waf.chaitin.com/en/home). The same page lists core capabilities as defenses for web attacks, proactive bot-abuse defense, HTML and JS code encryption, IP-based rate limiting, and a web access control list.
The feature section is the part a review should quote rather than expand:
- Block web attacks, including SQL injection, XSS, code injection, OS command injection, CRLF injection, XXE, SSRF, and path traversal.
- Rate limiting for DoS attacks, bruteforce attempts, traffic surges, and other abuse when traffic exceeds defined limits.
- A CAPTCHA challenge so human visitors can continue while crawlers and bots are blocked.
- An authentication challenge that blocks visitors who do not enter the password.
- Dynamic protection that encrypts HTML and JS from the web server on each visit.
Those controls are real documented features. They are not a promise that every payload, every bot, or every traffic spike will be stopped on an untested site. The pages supplied here do not describe a custom rule language, a SIEM connector, a marketplace listing, or an uptime SLA. A review should not add those items to look complete.
Putting the proxy in front of an app is also a feature constraint, not a footnote. In the console you add an application with a domain, hostname, or IP, a listen port such as 80 or 443, an SSL option for HTTPS apps, and the upstream address. You then resolve that name to the SafeLine server (https://docs.waf.chaitin.com/en/GetStarted/AddApplication). If DNS still points at the origin, the documented protection path is not in use.
What the sample table can and cannot decide
The introduction publishes an effect-evaluation table with 33,669 samples in each column (https://docs.waf.chaitin.com/en/home). The reported rows are ModSecurity Level 1 at 69.74 percent detection, 17.58 percent false positive, and 82.20 percent accuracy; CloudFlare Free at 10.70 percent detection, 0.07 percent false positive, and 98.40 percent accuracy; SafeLine Balance at 71.65 percent detection, 0.07 percent false positive, and 99.45 percent accuracy; and SafeLine Strict at 76.17 percent detection, 0.22 percent false positive, and 99.38 percent accuracy.
Use the table as published. Strict detects more of that sample set and also records a higher false-positive rate. Balance has the higher accuracy figure in this table, by a small margin. The excerpt does not define the payload mix, the rule versions, or the test date, so the numbers are not a license to claim a universal win over ModSecurity or CloudFlare outside that table. The introduction also says SafeLine is production-ready. That statement is about readiness, not about cost.
Pricing stays outside the verdict
A features-and-verdict review can be finished from these sources. A pricing review cannot. None of the three supplied pages lists a fee, a plan price, a billing period, or a discount. The only license sentence in the deploy guide is operational: SafeLine on ARM requires a Pro license to work properly, and the Personal Edition is not supported on ARM (https://docs.waf.chaitin.com/en/GetStarted/Deploy). That does not say what Pro costs. Inventing a monthly figure, or calling one edition cheaper than another product, would break the ledger.
Until a current quote is in hand, mark pricing as unknown. If the host is ARM, also mark Personal Edition as unsupported before you compare any future quote with an x86_64 install.
Checklist before a deploy verdict
- Host fit. The deploy guide requires Linux, x86_64 or arm64, Docker 20.10.14 or above, Docker Compose 2.0.0 or above, at least 1 CPU core, 1 GB memory, 5 GB disk, and a CPU with ssse3 (https://docs.waf.chaitin.com/en/GetStarted/Deploy).
- Proxy fit. You can move the public name to SafeLine and keep the origin as upstream.
- Control fit. Rate limits, CAPTCHA, password challenge, and dynamic HTML and JS encryption match the abuse you actually see.
- Detection fit. Choose Balance or Strict from the published false-positive tradeoff, then replay your own traffic in staging. The application guide even shows sample SQL injection, XSS, path traversal, code injection, and XXE URLs you can adapt to your domain to confirm the block page (https://docs.waf.chaitin.com/en/GetStarted/AddApplication).
- Release fit. The deploy guide says the LTS line will no longer be maintained starting from 9.1.0-LTS on 14 August 2025, and it strongly recommends that LTS users upgrade to the latest version.
- Price fit. Unscored until the vendor supplies terms. ARM additionally requires Pro.
Verdict from this ledger: SafeLine is a documented self-hosted reverse-proxy WAF with a concrete feature list, a published sample comparison, and an explicit production-ready statement. It is a sound candidate when the host meets the Docker baseline, DNS can point at the WAF, and the needed controls are rate limiting, bot or password challenges, and dynamic HTML and JS encryption. It is not a finished commercial review, because pricing is absent from these official pages. Do not deploy yet if the host misses the minimums, the CPU lacks ssse3, ARM is required without Pro, or the buying decision depends on a price these sources do not give.
Which features belong in a SafeLine review?
Web-attack blocking, rate limiting, CAPTCHA challenge, authentication challenge, and dynamic HTML and JS encryption, together with IP-based rate limiting and a web access control list (https://docs.waf.chaitin.com/en/home). Leave out any integration these three pages do not describe.
Can this review name a price?
No. The supplied home, deploy, and application pages do not publish fees. They only state that an ARM install needs a Pro license and that Personal Edition is not supported on ARM (https://docs.waf.chaitin.com/en/GetStarted/Deploy). Get a current quote before you score cost.
How do Balance and Strict differ in the official table?
On 33,669 samples, Strict detection is 76.17 percent against 71.65 percent for Balance. False positives are 0.22 percent for Strict and 0.07 percent for Balance. Accuracy is 99.38 percent for Strict and 99.45 percent for Balance (https://docs.waf.chaitin.com/en/home). Pick Strict only when the extra detections justify the higher false-positive rate on your own staging traffic.
Install SafeLine, add the application with domain, port, and upstream, and point DNS at the SafeLine server (https://docs.waf.chaitin.com/en/GetStarted/AddApplication). The console is documented at port 9443, and the initial admin account is issued by running resetadmin in the safeline-mgt container (https://docs.waf.chaitin.com/en/GetStarted/Deploy). A running container alone does not prove the origin is behind the proxy.
When should the verdict be to wait?
Wait if CPU, memory, or disk is below the stated minimum, if Docker or Compose is too old, if ssse3 is missing, if you need ARM without Pro, or if you cannot move DNS. Also wait if the decision hinges on price, because these sources do not provide one.
SafeLine has surpassed 700,000 installations worldwide as of September 30, 2026. SafeLine Pro annual promotional pricing is $650-$880, compared with the regular $1,000 per year.