AgentIndex icon
AgentIndex
Viper logo
Viper
★ 5.3k
vs
assay logo
assay
★ 13

Viper vs assay

Viper: VIPER is a powerful and flexible red team platform designed for adversary simulation and cybersecurity assessment. It integrates core tools, an LLM agent, and over 100 post-exploitation modules to efficiently complete red team operations.; assay: Assay provides an open, recomputable evidence profile for privileged AI agent tool actions, enforcing policies deterministically and fail-closed. It records decisions, observations, and unproven claims into tamper-evident bundles for offline verification and security auditing.

01

TL;DR

Viper logo
ViperSecurity & Safety · ★ 5.3k

Efficiently conducting cybersecurity assessment tasks.

Read Viper full review →
assay logo
assaySecurity & Safety · ★ 13

Generating small, reviewable CI artifacts for bounded auditability from existing evaluation outputs, runtime decisions, or MCP tool-call tests.

Read assay full review →
02

Side-by-Side Comparison

Field
Viper logoViper
assay logoassay
Category
Security & Safety
Security & Safety
Stars
★ 5.3k
★ 13
License
—
MIT
Install Command
git clone https://github.com/FunnyWolf/Viper.git
curl -fsSL https://getassay.dev/install.sh | sh
Updated
4mo ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
Red Team Platform, Cybersecurity, Adversary Simulation
AI Agent Security, Tool Call Enforcement, Evidence Auditing
03

Features

Viper logoViper
01Intuitive User-Friendly Interface for rapid task initiation.
02Multi-Platform Support for Windows, Linux, and macOS.
03Comprehensive Red Teaming Tools covering all MITRE ATT&CK phases with over 100 modules.
04Integrated LLM Agent for enhanced automation and intelligent decision-making.
05Custom Extensibility via Python-based module development and advanced functions like defense evasion and pivot graph.
assay logoassay
01Deterministic, fail-closed policy enforcement for tool calls, including optional kernel-level enforcement on Linux.
02Generates offline-verifiable, tamper-evident evidence bundles for audit and replay, integrated with CI without a hosted backend.
03Classifies claims by their trust basis (verified, self_reported, inferred, absent) to ensure honesty and prevent claims from exceeding observed facts.
04Policy gate (`assay mcp wrap`) for pre-execution allow/deny decisions on privileged tool calls, with clear reasons.
05Integrates with CI/CD pipelines via GitHub Actions and SARIF, enabling policy gates on pull requests and security-tab integration.
04

Use Cases

Viper logoViper
↳Efficiently conducting cybersecurity assessment tasks.
↳Executing adversary simulation and red team operations.
↳Automated 24/7 security monitoring and incident response.
assay logoassay
↳Generating small, reviewable CI artifacts for bounded auditability from existing evaluation outputs, runtime decisions, or MCP tool-call tests.
↳Processing Promptfoo JSONL output from CI evaluations to produce evidence receipts and verified bundles.
↳Auditing and enforcing policies on MCP (Multi-Modal Command Protocol) tool calls, providing an allow/deny audit trail and observed-behavior evidence.
↳Implementing GitHub PR gates based on Trust Basis diffs and policy status, with SARIF/JUnit-ready output.
↳Generating inventory receipts and verified bundles from CycloneDX ML-BOM model components for model inventory and provenance.
FAQ

FAQ

What is the difference between Viper and assay?
Both Viper and assay are in the Security & Safety category. Viper has 5.3k stars, while assay has 13 stars.
Which is better, Viper or assay?
The best choice depends on your use case. Choose Viper if Efficiently conducting cybersecurity assessment tasks., and assay if Generating small, reviewable CI artifacts for bounded auditability from existing evaluation outputs, runtime decisions, or MCP tool-call tests..
Is Viper free or open source?
Yes, Viper is open source on GitHub.
Is assay free or open source?
Yes, assay is open source on GitHub (MIT).
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