TL;DR:
Unique visitors is the number of distinct people who visited in a period, counted once each regardless of how many times they came back. It differs from pageviews (total page loads) and sessions (total visits). Cookieless tools count unique visitors with a daily-rotating anonymous signal, so the count is accurate within a day and deliberately does not track a person across days.
Unique visitors is the metric that answers "how many people", as opposed to "how many visits" or "how many page loads". It is the number most people mean when they ask how much traffic a site gets, and the one most often confused with pageviews and sessions.
Unique visitors vs pageviews vs sessions
| Metric | Counts | Example (one person, 2 visits, 5 pages) |
|---|---|---|
| Unique visitors | Distinct people | 1 |
| Sessions | Visits | 2 |
| Pageviews | Page loads | 5 |
How cookieless tools count them
Cookie-based tools count a unique visitor with a persistent cookie that survives for months, so they can recognise the same person across days. Cookieless tools use an anonymous signal that rotates daily: within a day, the same person counts once; across days, there is deliberately no link. This makes single-day unique counts accurate and keeps very-long-window return-visitor metrics deliberately approximate, the privacy trade-off, made on purpose.
If your unique-visitor count looks lower than a cookie-based tool's, that gap is mostly the privacy-conscious visitors who decline the cookie banner, plus opt-outs being honoured, not missing traffic.
Open Analytics counts unique visitors cookielessly and shows them beside sources, journeys and revenue.
See how it worksFrequently asked questions
- What is the difference between unique visitors and pageviews?
- Unique visitors counts distinct people, each once; pageviews counts total page loads. One person who visits twice and views five pages is 1 unique visitor and 5 pageviews. Unique visitors measures reach; pageviews measures consumption.
- How do cookieless tools count unique visitors?
- With a daily-rotating anonymous signal rather than a persistent cookie. Within a single day the same person is counted once; across days there is deliberately no link, so no profile follows anyone. Single-day counts are accurate; long-window return-visitor precision is traded for privacy on purpose.
- Why are my unique visitors lower than in Google Analytics?
- Mostly because a cookieless tool honours privacy signals and does not rely on a consent banner, so it records the visitors GA loses when they decline. Lower unique-visitor numbers here are usually opt-outs being respected, not traffic going missing.