AI Agent Security Platforms: A Category Map
AI agent security platforms span identity, gateways, guardrails, observability, and in-code enforcement. What each layer does, what it cannot do, and who is in it.
10 min readComparisons
How Arcjet compares
How Arcjet compares to other AI agent security approaches, and how the categories in this market differ by what they can actually stop.
13 comparisonsUpdated
Start here
Orientation first: how the AI agent security market breaks down by layer, and what building these controls in-house actually costs.
Arcjet Build vs Buy: Every Feature and What Building Costs
A deep dive on every Arcjet feature, where each check runs, and what the published evidence says it costs to build the same controls in-house.
62 min readAI agent security
How in-code enforcement compares to guardrails, content inspection, and observability products, and where each agent framework and SDK can actually deny an action.
Agent framework security: where each stack can deny
How Eve, Mastra, Claude Agent SDK, OpenAI Agents SDK, LangGraph JS, and LangChain Python differ on inbound screening, authored-tool deny, MCP deny, and the HITL trap.
7 min readOpenAI Agents SDK vs Claude Agent SDK
Two first-party agent SDKs. Claude denies inbound text on UserPromptSubmit and built-ins or MCP on PreToolUse. OpenAI Agents screens with guard() before run() and guardTool on authored invoke only.
4 min readOpenAI Agents guardrails vs Arcjet
OpenAI Agents input, output, and tool guardrails are SDK tripwires. Arcjet is an in-process deny you call before run() and on authored invoke. They are not the same control.
5 min readLakera Alternative: Content Inspection vs In-Code Enforcement
A Lakera alternative depends on the job. Lakera is content inspection. Datadog AI Guard is telemetry. Rein is the in-code sidecar peer. Arcjet is the in-code check you call.
5 min readArcjet vs Rein Security
Arcjet vs Rein Security: two in-process approaches to agent runtime security. A Rein Security alternative that also covers HTTP bots, WAF, and rate limiting.
6 min readArcjet vs Datadog AI Guard
Looking for a Datadog AI Guard alternative? Arcjet vs Datadog AI Guard turns on where content is inspected and who authors the rule.
7 min readAikido Zen vs Arcjet
Aikido Zen vs Arcjet: a rules-as-code alternative to Aikido Zen Firewall. A library you import in JavaScript, TypeScript, and Python, versus a monkey-patching runtime agent.
9 min readWeb & application security
How Arcjet compares to edge WAFs, bot management products, and CAPTCHAs for protecting web applications and APIs.
Cloudflare vs Arcjet
Cloudflare vs Arcjet: a Cloudflare WAF alternative that runs Shield, bot detection, and rate limiting in your app, with checks on tool calls the edge never sees.
13 min readVercel WAF vs Arcjet
Vercel WAF vs Arcjet: a Vercel WAF alternative that runs Shield, bots, rate limiting, filters, and email validation in your Next.js app, on Vercel or any other host.
9 min readVercel BotID vs Arcjet
Vercel BotID vs Arcjet: a Vercel BotID alternative for Next.js with allow/deny by category, inspectable decisions, and advanced client signals — on any host.
7 min readCAPTCHAs vs Arcjet
Looking for a CAPTCHA alternative? Turnstile, reCAPTCHA, and hCaptcha challenge a browser form. Arcjet advanced signals detect automation without a widget.
9 min readSecurity in your code
The fastest comparison is running it
Install the Arcjet SDK, add a rule, and watch decisions land in your request path in a few minutes — then judge the alternatives against something working in your own application.