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

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

Pick Prominara if

• Fits if you want to know whether a change moved AI answers, rather than guessing from the trend
• Works for agencies reporting to a few clients under their own brand, from Pro

Look elsewhere if

• Skip it if you need daily checks, as prompts are re-checked weekly at most
• Tight if you start on Starter: 15 prompts on 2 of the 5 AI surfaces, checked every two weeks
• Pricey if you want all five surfaces or white-label reports, which start on Pro at $149 a month
• Too light for agencies with more than 3 clients, as Agency includes 3 workspaces and more means asking sales
• Watch out: plans bill monthly, and yearly billing is arranged by email with no saving stated

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.

Prominara

• Starter covers only 2 of the 5 AI surfaces, checks every two weeks rather than weekly and has no white-label reports.
• Prompts are re-checked weekly at most, not daily; the vendor says this is deliberate to judge changes against noise.
• Plans are billed monthly; annual billing is arranged by email, and the page states no saving for it.
• Agency includes 3 client workspaces; more clients means asking sales to raise the limits.

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.

Prominara

Prompt tracking on five AI surfaces

Puts tracked buyer questions to ChatGPT, Perplexity, Gemini, Google AI Overviews and AI Mode, counting mentions and citations apart, with position and sentiment.

Source gaps and playbooks

Ranks the pages each answer cites and, where competitors are cited and you are not, writes a playbook with steps, effort and risks.

Share of voice

Shows how often AI names you against each competitor, engine by engine, counting only prompts that do not name you, with a range on each figure.

Site audit and generators

Scores more than 40 page and site checks into a 0 to 100 GEO score and generates llms.txt, robots.txt, sitemap and JSON-LD schema from the crawl.

Impact measurement

Log a change and it compares the prompts you worked on with ones you did not touch over 7, 14 and 28 days, giving a probability rather than a yes or no.

Accuracy monitor and agent access

Flags wrong facts AI states about your brand with a correction playbook, and an MCP connection lets Claude, ChatGPT, Cursor or Codex use the workspace.

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.

Prominara

• Starter$29

  per month for 15 prompts on 2 AI platforms, billed monthly

  1 website, citation checks every two weeks, 10 pages audited in depth per run, 3 months of history and 3 llms.txt or schema generations a month.

• Pro$149

  per month for 50 prompts on 5 AI platforms, billed monthly

  3 websites, weekly checks on all five AI surfaces, 50 pages audited per run, 12 months of history, unlimited generators and 5 white-label reports a month.

• Agency$299

  per month for 120 prompts on 5 AI platforms, billed monthly

  3 client workspaces with 6 websites, 200 pages audited per run, 24 months of history, unlimited white-label reports and client portals.