Known Agents vs llms-txt.io (2026): which should you pick?

Pick Known Agents if

• Fits if you publish online and want to choose which AI crawlers can read your site
• Works for developers who need to verify AI agents in their own code through an API

Look elsewhere if

• Skip it if you want to know what ChatGPT says about your brand, as it doesn't check answers
• Tight if your site is busy: every API call and batch item counts, so budget about twice your human visits
• Not for you if you can't touch your server, CDN or WordPress setup, as there's no pasted script
• Watch out: the free plan stops at 100,000 events a month, with 1 project and only the basic features
• Watch out: custom features, a custom API and live support are on Enterprise, arranged through a demo

Pick llms-txt.io if

• Fits if your docs are read by AI coding assistants and you want an llms.txt for them
• Works for teams that want the file regenerated when the docs change, from $15 a month

Look elsewhere if

• Not for you if you want to know whether AI search mentions or cites you, as it doesn't track that
• Tight if your site is big: llms-full.txt stops at 20 pages free, 50 on Starter and 100 on Pro
• Watch out: the free API returns only the short llms.txt, and calls past the monthly quota fail until the month resets
• Pricey if you need more than 10 managed sites or a white-label generator, which need the sales-priced Business plan
• Skip it if you want yearly billing, as plans are monthly only

Known Agents

• It measures bot visits and AI referrals to your site; it does not check what AI engines say about your brand in their answers.
• Events include every API call and each item in a batch; the vendor suggests budgeting about twice your monthly human visits.
• The free plan stops at its monthly event limit; paid plans get an email suggesting an upgrade when they run over.
• It needs a server, CDN or WordPress integration to collect data, rather than a script pasted into the page.

llms-txt.io

• It produces and checks llms.txt files; it does not track whether AI search engines mention or cite a brand.
• Through the API, llms-full.txt needs Starter or above; the free API plan returns only the shorter llms.txt.
• API calls past the monthly quota return errors until the next month, and unused quota does not roll over.
• Plans are billed monthly in US dollars; the pricing page lists no annual option.

Known Agents

Agent Analytics

Lists the crawlers, scrapers and AI agents visiting a site in real time, with traffic trends, pages visited, sessions, errors and robots.txt violations per agent.

AI chat referral tracking

Counts human visits that come from ChatGPT, Claude, Gemini, Copilot, Perplexity, DeepSeek and other AI chats, kept apart from bot traffic.

Automatic robots.txt

Serves a robots.txt that blocks or allows agents by category and updates itself as new bots are found; the WordPress plugin can block bots that ignore it.

Agent Identification API

Identifies and verifies the agent behind an incoming request from your own code, for setting access rules by verified identity.

Server-side collection

Data is sent from the server, CDN or backend rather than a browser script, so it still works when browser analytics are blocked.

Agent Directory

A public directory of thousands of agents and bots that says who runs each one, what it does and how to manage its access.

llms-txt.io

llms.txt and llms-full.txt generator

Crawls a site and writes spec-following files with AI-written summaries and per-link descriptions; free on the web with no account.

Validator

Lints a file, by URL or pasted text, for structure and readiness for AI agents, and gives a score with what to fix.

Managed sites

Re-checks a site weekly or daily, regenerates only when content changes, and serves the file from a stable URL or pushes it to a webhook.

API

Generate and validate files from scripts, CI or another product with API keys and monthly quotas that reset each calendar month.

Agent Readiness Score

A free scan of 19 checks on whether AI coding agents can reach, find, read and build from a site's public documentation.

Known Agents

• Free$0

  1 project and 100,000 events a month, with basic features. The vendor says this covers most websites.

• Startup$25

  per month for 1M events, billed yearly ($29 billed monthly)

  3 projects, 1 million events a month, the premium features and priority support.

• Growth$250

  per month for 10M events, billed yearly ($299 billed monthly)

  10 projects, 10 million events a month, the premium features and high-priority support.

• EnterpriseCustom

  Unlimited projects, usage-based events, custom features and API, and dedicated live support. Arranged through a demo.

llms-txt.io

• Free$0

  Unlimited web generation, llms-full.txt up to 20 pages, 25 API generations and 2,000 API validations a month.

• Starter$15

  per month for 1 managed site, billed monthly

  Files kept current weekly or daily from a stable URL with a change webhook, 400 API generations a month and llms-full.txt up to 50 pages.

• Pro$49

  per month for up to 10 managed sites, billed monthly

  llms-full.txt up to 100 pages, scheduled regeneration with webhook delivery, 1,500 API generations a month and higher rate limits.

• BusinessCustom

  Up to 250 managed sites, custom volumes and rate limits, and an embeddable or white-label generator. Sold through sales.

Known Agents

• Annual discount

  Save up to 16% with yearly billing

  Known Agents lists Startup at $25 a month billed yearly instead of $29 (14% less) and Growth at $250 instead of $299 (16% less).

llms-txt.io

No public discounts listed.