LightSite AI vs llms-txt.io (2026): which should you pick?

Pick LightSite AI if

• Fits if you want structured data and an AI sitemap added to your site through one snippet
• Works for large brands tracking AI answers in Japan or other local languages, on Enterprise

Look elsewhere if

• Pricey if you just want AI answer tracking, as daily checks with competitors and citations start at $299 a month
• Tight if more than one person or domain is involved, as Foundation and Pro cover 1 user and 1 domain
• Skip it if you'd rather pay monthly, as every plan is billed a year upfront
• Watch out: the 7-day trial turns into a paid year unless you cancel it
• Watch out: Search Console, content drafts and implementation support are Enterprise only

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

LightSite AI

• Plans are billed annually in advance; no monthly option is shown on the pricing page.
• Foundation and Pro cover one user and one domain; more users and domains need Enterprise.
• The trial converts to a paid year unless cancelled; a pro rata refund is possible in the first 90 days.
• Google Search Console, content drafts and implementation support are Enterprise only.

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.

LightSite AI

AI-readable website layer

A snippet or tag manager install publishes structured endpoints, JSON-LD, an AI sitemap and agent manifests on your domain, with no CMS plugin.

AI bot and crawler analytics

Records which AI crawlers and agents request which pages; Pro adds bot journey, page-level and link-level analytics.

AI search visibility tracking

Pro tracks prompts daily across ChatGPT, Gemini, Claude and Perplexity, with competitor, sentiment, position and citation source analysis.

LLM traffic attribution

On Pro, counts human visits referred by AI assistants where the referral can be identified.

Action recommendations

Pro suggests fixes to improve how the brand appears; Enterprise adds content briefs and drafts, gap scans and outreach preparation.

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.

LightSite AI

• Foundation$129

  per month for 500 prompts a month, billed annually

  One user and one domain, the AI-readable website layer, LLM bot and crawler analytics, and basic visibility and brand mention tracking.

• Pro$299

  per month for 2,700 prompts a month, billed annually

  Daily monitoring across major LLMs, competitor, sentiment and citation tracking, LLM traffic attribution, full structured data and onboarding.

• EnterpriseCustom

  Unlimited prompts, users and domains, Japan and local-language tracking, Search Console, content drafts, outreach prep and premium SLA.

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.