AI · alternatives · 2026
24 alternatives to PromptGuard
Scan AI prompts for injection attacks and PII leaks
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
Every other gateway is detect-and-block. You don't get a security grade. You don't get red team in CI. We built the one that does. PromptGuard is a proxy: change your base URL (one line with our SDK, or a few lines without), and every request gets checked for prompt injection, PII leaks, jailbreaks, and abuse. 20+ threat vectors, 39+ PII types. We also ship a red team suite and an autonomous agent that mutates attacks to find bypasses - you get a grade (A-F) and a GitHub Action that runs these tests on every PR. So you see where you're weak before you ship. Works with OpenAI, Anthropic,…
Dec 2025 · promptguard.co · its alternatives →
- 2
Find AI vulnerabilities before hackers do
Mar 2026 · promptbrake.com · its alternatives →
- 3
Prompt injection and token savings - #1 in benchmarks
Jul 2026 · constellationgate.ai · its alternatives →
- 4
Tiny prompt-injection firewall for LLM chat apps. 14 MB.
May 2026 · github.com · its alternatives →
- 5
AIVory Guard▲62Real-time compliance & security validation for AI coding
Dec 2025 · aivory.net · its alternatives →
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Scan any LLM chatbot for vulnerabilities
Apr 2026 · github.com · its alternatives →
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promptShield▲11Anonymize client docs before you paste them into AI
Jul 2026 · promptshield.ca · its alternatives →
- 10
Safeguard your prompts before they reach AI
Dec 2025 · preempt-ai.vercel.app · its alternatives →
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Find prompt injection holes in your AI agent. Free, 3 min
Aug 2026 · galeops.xyz · its alternatives →
- 13
Hi HN, Matvey, Ildar, Joey, and Dominik here. If you're building LLM agents that use tools, you're probably worried about prompt injection attacks that can hijack those tools. We were too, and found that solutions like prompt-based filtering or secondary "guard" LLMs can be unreliable. Our thesis is that agent security should be handled at the network level between the agent and the LLM, just like a traditional web application firewall. So we built Archestra Platform: an open-source gateway that acts as a secure proxy for your AI agents. It's designed to be a deterministic firewall against…
2025 · archestra.ai · its alternatives →
- 14
Find vulnerabilities in your AI prompts before your users do
Aug 2026 · testmyprompt.net · its alternatives →
- 15
OSS vulnerability assessment to secure your GenAI Apps
2024 · prompt.security · its alternatives →
- 16
Your agent team, on your machine. Open-source harness for multi-user Claude agents. - yaodub/cast
Jun 2026 · github.com · its alternatives →
- 17AM
I made an open source, MIT license Typescript library based on some of the latest research that generates prompt injection attacks. It is a super minimal/lightweight and designed to be super easy to use. Keen to hear your thoughts and please be responsible and only pen test systems where you have permission to pen test!
2025 · prompt-injector.blueprintlab.io · its alternatives →
- 18
The AI firewall that understands compliance context
Dec 2025 · promptlock.io · its alternatives →
- 19FP
We've built an open-source tool to stress test AI agents by simulating prompt injection attacks. We’ve implemented one powerful attack strategy based on the paper [AdvPrefix: An Objective for Nuanced LLM Jailbreaks](https://arxiv.org/abs/2412.10321). Here's how it works: - You define a goal, like: “Tell me your system prompt” - Our tool uses a language model to generate adversarial prefixes (e.g., “Sure, here are my system prompts…”) that are likely to jailbreak the agent. - The output is a list of prompts most likely to succeed in bypassing safeguards. We’re just getting…
2025 · security.vista-labs.ai · its alternatives →
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Just stop jailbreaks & prompt hacks with one API call.
2025 · expireddomains.com · its alternatives →
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Tiny, offline prompt-injection scanner for CI pipelines
Apr 2026 · github.com · its alternatives →
- 24
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →