PROMPTPurify
Tiny prompt-injection firewall for LLM chat apps. 14 MB.
What it does
Every OSS prompt injection guard needs a GPU, a sidecar, or 7 GB of disk. PromptPurify is 14 MB, CPU-only, runs inside your Node process. Zero network calls. $0/call. Two layers: deterministic structural firewall + 14 MB ML classifier. Benchmarked against Meta Prompt-Guard, ProtectAI, deepset same inputs, same scoring code, reproducible on your laptop. Battle-tested by 2,458 red teamers before release. MIT. Drop in with 3 lines of code.
Does the same job
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Constellation Gate AIJul 2026 · constellationgate.ai · ▲119Prompt injection and token savings - #1 in benchmarks
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