Arcjet
AI agent runtime security platform for detecting threats and enforcing policies.
- Paid· from $25/month
- Open Source
What is Arcjet?
Arcjet is an AI Security tool. AI agent runtime security platform for detecting threats and enforcing policies. Arcjet is a paid tool, starting at $25/month. A free trial of 15 days is available. It is aimed at developers, security teams and compliance officers.
Arcjet is an AI agent runtime security platform that detects threats, enforces policies across actions, prompts, and tool calls, and provides evidence of events. It offers features like prompt injection detection, agent tool-call authorization, and sensitive data redaction.
Built for developers, security teams and compliance officers.
Features
Prompt Injection Detection
Agent Tool-Call Authorization
Sensitive Data Detection and Redaction
Bot and API Abuse Protection
Rate Limiting
SIEM Export
Use cases
- Detect prompt injection attacks in AI agent interactions
- Authorize AI agent tool calls according to organizational policies
- Redact sensitive data from AI agent outputs
- Prevent bot and API abuse through access control
- Implement rate limiting to manage API usage
- Export security event data to SIEM systems for monitoring
Who it's for
Pros & cons
Pros
- Offers comprehensive AI agent runtime security features
- Provides SIEM export for security monitoring
- Includes rate limiting to manage API usage
Cons
- No free plan available; paid plans only
Pricing
Paid — paid plans start at $25/month. Free trial of 15 days available.
| Plan | Price |
|---|---|
| Individual | $25 / month |
| Startup | $299 / month |
| Enterprise | Custom |
Developer & API
Open source· Apache-2.0· 4 stars· 0 forks
Security & compliance
- SOC 2
- Data deletion
As stated on Arcjet's website — not independently verified by AiByts.
FAQ
What is Arcjet?
Arcjet is an AI Security tool. AI agent runtime security platform for detecting threats and enforcing policies. Arcjet is an AI agent runtime security platform that detects threats, enforces policies across actions, prompts, and tool calls, and provides evidence of events. It offers features like prompt injection detection, agent tool-call authorization, and sensitive data redaction.
Is Arcjet free?
No, Arcjet is a paid tool. A free trial is available.
How much does Arcjet cost?
Arcjet offers 3 plans: Individual ($25 / month), Startup ($299 / month) and Enterprise (Custom).
Who should use Arcjet?
Arcjet is built for developers, security teams and compliance officers. Common uses: detect prompt injection attacks in AI agent interactions, authorize AI agent tool calls according to organizational policies, redact sensitive data from AI agent outputs and prevent bot and API abuse through access control.
What does Arcjet integrate with?
Arcjet integrates with Vercel, OpenAI, Anthropic and LangChain.
Is Arcjet open source?
Yes, Arcjet is open source under the Apache-2.0 license.
What are the best alternatives to Arcjet?
Similar tools on AiByts include Axari, Checkmarx, Constellation Gate AI, Suprbox and Koreshield.
Arcjet news & updates
Introducing Arcjet for coding agents: security policies for Claude Code, Codex, Cursor, Muse Code, and Copilot
Discover every coding agent on developer endpoints and apply one set of security policies across Claude Code, Codex, Cursor, Muse Code, and Copilot.
Arcjet Blog4 min read
Introducing Agent Runtime Security: Observe, Enforce, Audit
Which agents are running? Should this particular action be allowed? What happened, and why? This is what Arcjet is now tackling.
Arcjet Blog5 min read
The two speeds of AI agent runtime security
AI agent security is moving at two speeds: most teams need action-level runtime enforcement now, while Google’s Beyond Zero points to what comes next.
Arcjet Blog8 min read
SDK releases, security briefing improvements, new activity view
What's new in Arcjet (2026-07-03). New SDK updates, security briefing email improvements, Nosecone nonce API, and a new Console activity view.
Arcjet Blog2 min read
Running PII detection locally with the Rampart NER model
How Arcjet added an optional on-device model backend for sensitive information detection: a pluggable rule interface, deterministic recognizers for structured data, offset reconstruction for token-classification output, and local ONNX inference in the request path.
Arcjet Blog11 min read
SDK performance releases and proxy detection
What's new in Arcjet (2026-06-12). New versions for each of our JS, Python, and Go SDKs to improve performance and detect proxies.
Arcjet Blog2 min read
Making Arcjet's Wasm bot detector smaller and faster
Reducing WebAssembly bundle size: how Arcjet shrank its Rust bot detector 27% with Aho-Corasick, keeping per-request memory isolation and using Wizer snapshots.
Arcjet Blog8 min read
Announcing advanced bot signals to detect automation without CAPTCHAs
Arcjet Signals are evaluated without a CAPTCHA and enforced when the request passes through a critical flow. The browser gives us signals. The application gives us intent.
Arcjet Blog7 min read
Designing a CLI for AI agents
How we designed the Arcjet CLI in Go as a stable, defensive interface for humans and AI agents: predictable commands, machine-readable output, strict validation, and confirmation before production changes.
Arcjet Blog11 min read
Unified skills, Python docs, email management
What's new in Arcjet (2026-05-22). Unified coding agent skills, expanded Python docs, email notification management.
Arcjet Blog2 min read
Serving AI models with Open Inference Protocol APIs
How Arcjet hosts AI security models using Python, Open Inference Protocol, Go, and Modal: the architecture behind prompt injection detection.
Arcjet Blog7 min read
Details are compiled from Arcjet's website and public sources, last verified Oct 7, 2026. Features and pricing change — confirm on the official site before you buy.
Try Arcjet
Paid · from $25/month
Tags
- AI Agent Security
- Prompt Injection Detection
- Data Loss Prevention
- Bot Protection
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