Rein Security, a trusted application security company for leading enterprises, is launching from stealth to address critical blind spots in application and AI security.
Building on an initial $8 million seed round led by Glilot Capital, Rein delivers a patent pending technology that provides real-time context and protection inside application production environments, the company said.
Enterprises across a variety of industries, such as financial and other business-critical services, rely on Rein to protect applications running in production, including Lemonade and HiBob.
After years of being forced to make decisions with incomplete data and time-consuming investigations, security leaders Matan Bar Efrat and Netanel Rubin founded Rein to build a platform grounded entirely in real production insight.
“Security teams have been forced to play guesswork for far too long and we can no longer allow application security to be rooted in assumptions instead of reality,” said Bar Efrat, co-founder and CEO of Rein Security. “We founded Rein to give CISOs and AppSec leaders the ability to protect every app, MCP, library and API without disruption. By seeing and controlling exactly what happens to apps in production, teams can resolve real issues quickly rather than spending excessive time on investigations and analysis.”
According to the company, Rein is creating a whole new axis that closes the gap by providing organizations with a direct, continuous livestream of code behavior, requests and risks inside production environments.
The Rein platform solves key AppSec use cases, including API security and SCA reachability, by applying application runtime context to surface validated risks in production versus theoretical ones.
This approach helps teams move beyond static assumptions to understand which APIs and libraries are present in applications in production, determine vulnerability reachability, and focus remediation efforts more effectively.
Key capabilities of the Rein platform include:
- Complete visibility in production: A real-time, code-level view into application behavior.
- Runtime protection: Granular and impact-centric protection covering both zero-day and one-day exploits.
- AI-security: Visibility and protection needed to mitigate risks from MCP, AI agents, AI-native apps and emerging application architectures.
- Agentless architecture: Applies production context with under one millisecond of performance impact and no reliance on proxies, sampling or eBPF.
- Cross-domain application security support: Applies production context across multiple AppSec domains, including API Security, SCA, SAST, DAST, and AI security.
For more information about this news, visit www.reinsec.io.