What Is Sonner?
LibrarySonner is an opinionated toast-notification component for React, created by Emil Kowalski. It renders stacked, swipe-to-dismiss toasts with a single `<Toaster />` mount and a `toast()` call, and is the toast component shipped with shadcn/ui — which makes it a frequent companion of shadcn-based and AI-generated React apps.
Detect Sonner on any website:
Why Sonner Matters
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Sonner is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted Sonner on 21 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
Does Sonner Mean a Site Was Built With AI?
Sonner alone is not an AI signal.
A library is standard web tooling used by hand-coding developers and AI tools alike. It becomes weak supporting context only in combination with other evidence — for example a shadcn/ui + Supabase + Vite bundle that matches a known AI-builder export — and never counts as proof on its own.
How this feeds the score: builder fingerprints, bundle artifacts and AI-tool traces are weighed separately from stack context like frameworks, libraries and hosting. The full breakdown is on How scores work.
How Websites Using Sonner Work
- Single `<Toaster />` component plus an imperative `toast()` API
- Stacked, swipeable toasts with promise, success, error and loading variants
- Default export of the shadcn/ui `toast` component since 2024
- Zero-dependency, styled with its own CSS custom properties
Best Practices When Working With Sonner
Based on patterns in our scan dataset and the detection evidence tiers.
- →Start by running a Sonner detection scan on any URL you're evaluating — the 80+ signal engine returns a confidence score plus the exact markers it matched, which beats reading view-source by hand.
- →Cross-check the result against the full detection evidence in /how-scores-work — confidence tiers tell you whether a match is strong (headers + scripts) or circumstantial (a single HTML pattern).
How we detect Sonner — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How Our Detector Identifies Sonner
Our scanner analyzes multiple layers of a website's technical fingerprint to detect Sonner usage.
- A `[data-sonner-toaster]` or `[data-sonner-toast]` element in the rendered DOM
- Bundle references to the `sonner` package
Websites Built With Sonner
Real sites detected by our scanner
What Sonner Sites Usually Run Alongside
Technologies detected on the same domains as Sonner in our most recent scans. Counts are unique domains, not page views.
Frequently Asked Questions About Sonner
What is Sonner?+
Sonner is an opinionated toast-notification component for React, created by Emil Kowalski. It renders stacked, swipe-to-dismiss toasts with a single `<Toaster />` mount and a `toast()` call, and is the toast component shipped with shadcn/ui — which makes it a frequent companion of shadcn-based and AI-generated React apps.
Does Sonner mean a website was built with AI?+
Sonner alone is not an AI signal. A library is standard web tooling used by hand-coding developers and AI tools alike. It becomes weak supporting context only in combination with other evidence — for example a shadcn/ui + Supabase + Vite bundle that matches a known AI-builder export — and never counts as proof on its own.
Why does Sonner matter?+
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Sonner is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted Sonner on 21 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
How do we detect Sonner?+
Our scanner checks for these signals: A `[data-sonner-toaster]` or `[data-sonner-toast]` element in the rendered DOM; Bundle references to the `sonner` package. Each match contributes to a confidence score, and the full evidence tiers are documented at /how-scores-work.
How many websites using Sonner are in the database?+
We've fingerprinted 21+ live sites built with Sonner across our scan dataset. The list refreshes as new scans come in.
What are the typical characteristics of a Sonner website?+
Single `<Toaster />` component plus an imperative `toast()` API. Stacked, swipeable toasts with promise, success, error and loading variants. Default export of the shadcn/ui `toast` component since 2024. Zero-dependency, styled with its own CSS custom properties
Related Tools & Technologies
Other libraries and services we detect
Ready to put Sonner detection to work?
You now know what Sonner is, why it matters, how to spot it, and where the detection signals come from. The next step is using that knowledge on a real URL — yours, a competitor's, or a prospect's.