Signal Sciences launched a bit after us. The main difference is in the result: - Guys are helping to detect anomalies and attacks, and I believe they're doing this better than regular WAF does. - Wallarm helps to discover exploitable security flaws and incidents (vulnerabilities exploitation) within attacks/anomalies which it detects.

There is still lack of technical details on Signal Sciences website. And no public demo. Hey, guys, give us a try :)