AI · alternatives · 2026
24 alternatives to PromptGuard
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,…
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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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 →
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Prompt injection and token savings - #1 in benchmarks
Jul 2026 · constellationgate.ai · its alternatives →
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OP here. I built this because I recently caught myself almost pasting a block of logs containing AWS keys into Claude. The Problem: I need the reasoning capabilities of cloud models (GPT/Claude/Gemini), but I can't trust myself not to accidentally leak PII or secrets. The Solution: A Chrome extension that acts as a local middleware. It intercepts the prompt and runs a local BERT model (via a Python FastAPI backend) to scrub names, emails, and keys before the request leaves the browser. A few notes up front (to set expectations clearly): Everything runs 100% locally. Regex detection…
Dec 2025 · github.com · its alternatives →
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Prompt-injection firewall for prod LLM apps
Jul 2026 · insightits.com · its alternatives →
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PromptLayer is the prompt management platform for AI teams. Version prompts, run LLM evals, and monitor agents in production with tracing, logs, and regression sets.
2023 · promptlayer.com · its alternatives →
- 7
Stop prompt injection before it reaches your AI agent
Aug 2026 · mcp.glc-rag.hu · its alternatives →
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Your agent team, on your machine. Open-source harness for multi-user Claude agents. - yaodub/cast
Jun 2026 · github.com · its alternatives →
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Safeguard your prompts before they reach AI
Dec 2025 · preempt-ai.vercel.app · its alternatives →
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GitHub▲2Local sensitive data & API key blocker for ChatGPT.
Jun 2026 · github.com · its alternatives →
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Tiny prompt-injection firewall for LLM chat apps. 14 MB.
May 2026 · github.com · its alternatives →
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The AI firewall that understands compliance context
Dec 2025 · promptlock.io · its alternatives →
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Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative configs with command line and CI/CD integration. Used by OpenAI and Anthropic. - promptfoo/promptfoo
2023 · github.com · its alternatives →
- 19
promptShield▲11Anonymize client docs before you paste them into AI
Jul 2026 · promptshield.ca · its alternatives →
- 20
The only way to go fast is full YOLO mode in your coding agent. I've got the local sandbox figured out (pro tip: Incus VMs work great) but I wanted to keep my agents from doing things like inadvertently blowing up my cloud services or chasing a prompt to POST to some random website. I struggle most with this on my side projects where my permission model isn't quite as robust as it is at the office. I started with a firewall on the Incus container but every time the agent needed access to something new, I was poking more holes in it - and it didn't differentiate between HTTP verbs. I've been…
Jul 2026 · trollbridge.dev · its alternatives →
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Block malicious web content before it reaches your AI.
Jan 2026 · its alternatives →
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Hi HN, I’m the creator of Cordum. I’ve been working in DevOps and infrastructure for years (currently in the fintech/security space), and as I started playing with AI agents, I noticed a scary pattern. Most "safety" mechanisms rely on system prompts ("Please don't do X") or flimsy Python logic inside the agent itself. If we treat agents as autonomous employees, giving them root access and hoping they listen to instructions felt insane to me. I wanted a way to enforce hard constraints that the LLM cannot override, no matter how "jailbroken" it gets. So I built Cordum. It’s an open-source…
Jan 2026 · github.com · its alternatives →
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Find AI vulnerabilities before hackers do
Mar 2026 · promptbrake.com · its alternatives →
- 24FP
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 →
Also compare
- Open-Source Gateway to Stop Tool-Abusing Prompt Injections alternatives
- Constellation Gate AI alternatives
- Local Privacy Firewall-blocks PII and secrets before ChatGPT sees them alternatives
- PromptLayer alternatives
- Insight IT Solutions PrismGuard alternatives
- PromptLayer – Track, debug, and maintain GPT prompts in prod alternatives
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 →