
NULLSQUARE
PromptGuard
Block AI on every device. Nullgen’s free browser extension stops AI prompts; the iOS, Android, Mac, and Windows apps block known AI apps and sites. For families, schools, and IT.

Wallarm
Metlo API Security
PromptGuard
SecureStack
API security risk scoring platform, Instant API & AI security scan, no setup required.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | nullgen.ai | middlebrick.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from the United States · 1 - 9 employees | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Nullgen is an endpoint security and content-filtering solution designed for enterprise IT, security teams, and educational institutions to eliminate generative AI shadow IT. It prevents users from submitting proprietary code, confidential business data, or sensitive student records into...
middleBrickAPI Security Risk Scoring Platform middleBrick scans any API endpoint and returns a security risk score (A+ through F) with actionable findings — no agents, no config, no credentials required. How it works Submit a URL or OpenAPI spec. middleBrick runs 12+ security checks in parallel...
What each product offers, as listed by its team.


No features have been listed yet.
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Nullgen yet.
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Nullgen and middleBrick.
middleBrick's answer:
middleBrick assigns a quantitative risk score (0-100) to any API in seconds, not weeks. It covers OWASP API Top 10, GraphQL, and LLM/AI-specific security checks in a single scan. It integrates directly into developer workflows via CLI, GitHub Action, and MCP server for AI assistants — no sales calls, no setup meetings.
middleBrick's answer:
Most API security tools require enterprise contracts, complex onboarding, or inline proxies. middleBrick is fully self-service: scan any API endpoint in minutes even with a free account.
middleBrick's answer:
DevSecOps engineers, API developers, and security teams at startups and scale-ups who need to test their APIs for vulnerabilities without long procurement cycles. Also teams building AI/LLM-powered products who need to secure their model-facing APIs.
Share your experience with using Nullgen and middleBrick. For example, how are they different and which one is better?
When comparing Nullgen and middleBrick, you can also consider the following products.

Continuous AI security testing for apps, APIs, cloud, and private environments — review findings, reports, and live agent activity in one place.
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Wallarm WAF is AI-powered Platform that automates real-time application protection combines Active Threat Verification engine with a DevOps friendly NG-WAF and security testing for websites, microservices and APIs across public and private clouds.
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Open Source API Security Platform
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