End AppSec guesswork.
Uncover application reality.
Protect every app, MCP, AI agent, library, and API
by finally seeing and controlling what they are actually doing.
THE REIN APPLICATION SECURITY PLATFORM
Every user interaction, resource accessed, invoked API,
and compromised line of code in dev, staging and prod.
No sampling, no proxies, no sidecars, no eBPFs.
A single tool for everything appsec.
Every user interaction, resource accessed, invoked API, and compromised line of code in dev, staging and prod.
No sampling, no proxies,
no sidecars, no eBPFs.
A single tool for everything appsec.
Built on a breakthrough, agentless visibility layer, Rein gives AppSec something it's never had before - real time context. From AI to SCA to SAST to real-time DR, replace guesswork with reality across every task.
Protect enterprise AI and agentic applications. See every agent, MCP, and prompt. Know exactly who accessed it, how, when, and why. Baseline behavior in real time and flag every deviation. No AI gateways. No BS.
See every API come alive in seconds- no scans, no sampling. Discover, map, and protect every endpoint in real time. Zombies included.
See real-time exploits in production. Know which libraries actually run, not just loaded into memory, and which CVEs only exist on paper. Enforce automatic guardrails across every function & library, with 0 (yes zero) MTR.
See exactly what your app did when things went wrong - full trace across every endpoint, function, and behavioral drift. Respond with deterministic evidence. Enforce real-time attack prevention with 0 MTR. Get code-level mitigation.
Turn incidents into clear timelines - showing exactly what ran, when, why and by whom - Investigate in 5 minutes instead of 5 days.
“For the first time, Rein shows us what’s really happening in our apps. When something deviates, we know it’s real.”
“This is the only AppSec solution in 20 years that I’ve been genuinely excited about.”
“This sounds magical. I didn't believe you until I saw it.”
“It’s not BS, this Rein thing.”
“Wow, this has the potential to replace everything - from API SEC to SCA and ASPM.”
“That's the only approach I've seen that can actually solve our MCP and vibe coding problem.”
“Everybody tackles the symptoms. You tackle the root of the problem.”
Absolutely not. Rein is a read-only, agentless visibility layer. It does not modify, alter, or hook into your applications or runtime. Full context without compromising integrity.
No. Rein is fully agentless- no deployment headaches, no performance drag, no language-specific hacks, no SDKs. 2 minutes and you're good to go.
No. Rein doesn’t stare at traffic from the outside. Instead, it observes every action as it executes- 100% coverage, zero sampling.
No. Rein is extremely performant and doesn't break your app. It doesn't hook, instrument, modify or alter the runtime or the app.
No - if it would have been, it would have been impossible to provide such a level of visibility. eBPF sees the Kernel. Rein sees the app.
0.1% CPU. 20MB memory. 400 microseconds per request. Verified. It’s hundreds of times more performant than your WAF. Thousands of times more than observability tools.
It’s a patented, brand-new technology - like being able to ask the runtime what’s really happening, at any point in time. Once you see it live, it all clicks.
