AI · alternatives · 2026
24 alternatives to Constellation Gate AI
Prompt injection and token savings - #1 in benchmarks
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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Context Gateway▲220We built an open-source proxy that sits between coding agents (Claude Code, OpenClaw, etc.) and the LLM, compressing tool outputs before they enter the context window. Demo: https://www.youtube.com/watch?v=-vFZ6MPrwjw#t=9s. Motivation: Agents are terrible at managing context. A single file read or grep can dump thousands of tokens into the window, most of it noise. This isn't just expensive — it actively degrades quality. Long-context benchmarks consistently show steep accuracy drops as context grows (OpenAI's GPT-5.4 eval goes from 97.2% at 32k to 36.6% at 1M…
Mar 2026 · github.com · its alternatives →
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prompts.chat▲63Discover, collect, and share the best AI prompts for ChatGPT, Claude, Gemini, and more. Join the largest community of AI prompt engineers and creators.
Dec 2025 · prompts.chat · its alternatives →
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Tokenlimits▲64Check if your input satisfies the token limit of an AI model
2023 · tokenlimits.com · its alternatives →
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TokenVeil▲12Self-hosted AI proxy. Your data never leaves your network.
Jul 2026 · tokenveil.eu · its alternatives →
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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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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 →
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gate.cat▲5gate.cat blocks destructive shell commands before AI coding agents execute them. Open source, local, and fail-closed.
Jul 2026 · gate.cat · its alternatives →
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GrapeRoot▲10Cut your AI Bill by 60–70% with a local codebase graph!
May 2026 · graperoot.dev · its alternatives →
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Free master prompts for ChatGPT, Claude, Gemini & more
Mar 2026 · understandingai.net · its alternatives →
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The CI gate that says no to unapproved AI code
Aug 2026 · linebreakapp.com · its alternatives →
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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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New ways of breaking app-integrated LLMs . Contribute to greshake/llm-security development by creating an account on GitHub.
2023 · github.com · its alternatives →
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Save context, Claude count tokens, and enhance every prompt
Aug 2026 · 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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Open source authorization engine for AI agents. Confidence-aware gating · Human-in-the-loop review · Policy-as-code · Full audit trail - Lelu-ai/lelu
Jun 2026 · github.com · its alternatives →
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We explored a novel method to gauge the significance of tokens in prompts given to large language models, without needing direct model access. Essentially, we just did an ablation study on the prompt using cosine similarity of the embeddings as the measure. We got surprisingly promising results when comparing this really simple approach to integrated gradients. Curious to hear thoughts from the community!
2023 · heatmap.demos.watchful.io · 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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Save 89% of wasted tokens on your AI coding agent
Mar 2026 · rtk-ai.app · its alternatives →
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See what your AI coding agents think, cost and do
Jul 2026 · tokentelemetry.com · its alternatives →
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Share, remix & discover winning AI prompts for any model.
Dec 2025 · promptalphabet.com · its alternatives →
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One memory for ChatGPT, Claude, Gemini, Codex & more
Jul 2026 · ai-memory-vault.com · its alternatives →
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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 →