PromptBrake
Security testing for LLM-powered API endpoints
Details
- Categories
- AIDeveloper ToolsCybersecurity & Privacy
- Use Cases
- Testing & QAWebsite Security
- Target Audience
- DevelopersQA EngineersEnterprises
- Pricing
- Subscription from $49
- Platforms
- Web
About PromptBrake
PromptBrake helps teams security-test LLM-powered API endpoints with a fixed suite of automated attack scenarios. It finds prompt injection, prompt leaks, data exposure, and unsafe tool behavior, then returns clear PASS/WARN/FAIL results with evidence and remediation guidance. It’s built for APIs powered by OpenAI, Claude, Gemini, and custom LLM-backed apps, and analyzes results without using another LLM. It also includes free tools such as an LLM security checklist, a prompt injection payload generator, and an OWASP LLM test case mapper to help teams validate their setup early.
Product Insights
PromptBrake provides a web-based subscription platform for security testing LLM-powered API endpoints against automated attack scenarios. It delivers PASS/WARN/FAIL reporting and remediation guidance for APIs integrated with OpenAI, Claude, or Gemini without relying on additional LLM analysis.
- Supports multiple LLM frameworks including OpenAI, Claude, Gemini, and custom backed apps.
- Non-LLM driven analysis ensures deterministic and clear PASS/WARN/FAIL results with evidence.
- Includes a suite of free utilities such as a payload generator and OWASP test case mapper.
- Identifies specific vulnerabilities including prompt injection, data exposure, and prompt leaks.
Ideal for: Developers and QA Engineers needing to automate security testing for LLM-powered APIs within an enterprise environment.
Discount Codes
Try Pro Plan(-25% OFF)
Valid until May 30, 2026
Product Video
Watch a video demo of PromptBrake.
Screenshots
Product Updates (1)
Replay Packs and Free Tools
Two PromptBrake updates are now live. 1- Replay Packs help you test curated reproductions of real-world LLM attacks against your endpoint. 2- We also launched free public tools for teams doing earlier-stage security work: - LLM Security Checklist Builder - Prompt Injection Payload Generator - OWASP LLM Test Case Mapper Use the free tools to tighten your process. Use PromptBrake to run repeatable attacks against the AI API you actually ship.
Comments (2)
Really impressive to see this go live. This is a wonderful addition to the market. Rooting for your success!
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Comments (16)
How can i avail free credits
@subramani - You can sign up for free. In each plan, we offer a free trial so you can run a couple of scans.
Cool
Interesting project!
@NexiunDev - Thanks!
Peak permaculture
Nice work
@charlie6797 - Thanks!
Good for new startups
@shirleyyy - Absolutely!
Seems valuable
@jkleiner1 - Exactly, thanks!
Strong niche—LLM security is getting urgent fast. The non-LLM deterministic PASS/WARN/FAIL approach is a smart differentiator vs “LLM testing LLMs.” That clarity + OWASP mapping feels especially valuable for dev teams.
@jaybird84404 Correct, it is a strong niche with all AI products floating!
Great job
@alex5616 - Thanks!
Tried it Nice effective
@lloydperiera - Appreciate it — glad it was useful 🙌 If anything felt off or missing, I’d love to hear it.
really cool man
@rithiksudhakarr - Thanks!
Security testing for LLM APIs is a serious gap right now. Most teams ship AI endpoints without any red-teaming. Prompt injection vulnerabilities are real. Great timing for this tool.
@chaudharyarun5797 Exactly — and most teams only find out they're vulnerable when a user tells them. That's what PromptBrake is built to prevent. Appreciate it!
Interesting
@saifelyzal - Thanks!
very nice project!
@suleymanemreerbas Thanks!
I would like to hear more of you have a roadmap. This is what everyone is forgetting with all the AI stuff. No trust layer or governance.
You’re right. Most teams are shipping AI without a real trust layer. PromptBrake starts with deterministic security testing, then expands into CI gates, policy checks, audit-ready reports, and trend tracking so trust becomes part of release
@ajirjees88 - I work in the Service management space if you want to add the process layers and build this out. Happy to connect
@info2063 - Appreciate that. I agree that layer matters longer term, but for the MVP I’m deliberately staying focused on the core problem first: deterministic testing and clear security findings for AI APIs
Howdy, excited to share PromptBrake. I built it because testing AI APIs for security was still too manual, and I wanted a simpler way to catch issues before release.