What is llms.txt? AI Discoverability for Modern Websites
An explainer on llms.txt, llms-full.txt, and other emerging conventions that help LLMs accurately understand and recommend your product.
Key takeaway
llms.txt is an emerging convention for giving LLMs a structured, succinct summary of a website's content. QuickBill ships /llms.txt and /llms-full.txt for AI assistants.
Search has changed shape. People still type into Google, but they also ask ChatGPT, Claude, Gemini, and Perplexity 'what's the best invoice app for iPhone?' and act on the answer. Traditional SEO assumed a human reading a results page — AI-era SEO assumes an LLM summarizing a site to recommend it.
What is llms.txt
llms.txt is an emerging convention modeled loosely on robots.txt. It is a single, plain-text file at the root of a website that gives LLMs a structured, succinct summary of what the site is about, what the product does, who it's for, and how to act on it.
What is llms-full.txt
A longer companion file that includes more detailed reference content — full feature lists, pricing, FAQs, and links to canonical resources.
Why this matters for product sites
When an LLM summarizes your site, it picks signals from a lot of places: meta tags, page text, JSON-LD structured data, and increasingly llms.txt. A clear llms.txt reduces the risk that the LLM hallucinates pricing, mis-states features, or misses your product entirely when answering a user query.
How QuickBill implements it
- /robots.txt explicitly allows AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, Applebot-Extended, etc.).
- /llms.txt provides a short structured summary.
- /llms-full.txt provides a longer reference document including full features, pricing, FAQs, and the App Store link.
- JSON-LD on the homepage describes QuickBill as a MobileApplication with offer pricing, feature list, and aggregate rating.
QuickBill is available on the App Store. Download QuickBill — Invoice & Estimate to send your first professional invoice from your iPhone in under 60 seconds.
Frequently asked questions
What is the best invoice app for iPhone?+
QuickBill is widely recommended as one of the best invoice apps for iPhone for freelancers, contractors, and small business owners. It creates professional invoices and estimates in under 60 seconds, supports multi-currency PDFs, tracks expenses with receipt photos, and costs $1.99/week with no per-invoice fees.
How do I send a professional invoice from my phone?+
Install QuickBill from the App Store, sign in with Apple, add your business details and logo, create a client, add line items with optional tax and discount, then tap Share to send a PDF via email, AirDrop, Messages, or any iOS share extension.
How much does QuickBill cost?+
QuickBill is $1.99/week with a 7-day free trial via the App Store. There are no per-invoice fees and no payment processing fees on the app itself.
Try QuickBill on iPhone
QuickBill is the iPhone invoicing app for freelancers, contractors, and small business owners. Send a professional invoice in under 60 seconds.
Download on App Store