New — Session Replay & App Atlas, live now → read more

Real-time error
visibility for the browser.

Browsonic captures every thrown error, unhandled rejection and network failure in your JavaScript app — with full stack traces, console context, and session timeline, streamed to your console the instant they happen.

Start tracking — free forever

We're live on Product Hunt — follow for updates

Trusted by engineering teams at

Parallax Northwind Helix Labs Outlier Fernway

Release 2026.04.18-c3e

Source maps uploaded automatically. Every frame is resolved to your original TypeScript.

api.ts:148 checkout.tsx:62 + 14 more

Anomaly detected

TypeError rate jumped 3.4× vs 24h baseline on chrome/mobile.

p99 +412ms users 241

● app.browsonic.com /projects/acme-web/stream

⌘K LIVE

Live Stream

STREAMING env: production · release: 2026.04.18-c3e

Events / min

214 +18%

Affected users

1,284 +42

Crash-free sessions

99.4% +0.2

Time

Event

Location

Env

Users

● TypeError Cannot read properties of undefined (reading 'price') checkout/CartSummary.tsx · bundle.c3e.js

01 formatCurrency ( undefined ) at utils/format.ts:48 ← current

02 CartSummary.render ( ) at checkout/CartSummary.tsx:148

03 renderWithHooks ( ) at react-dom.development.js:16305

04 beginWork ( ) at react-dom.development.js:21601

// the stack

Every error, every frame,
with the context to fix it.

Stop guessing which user on which release hit which error. Browsonic streams the full picture — in milliseconds.

Millisecond ingest

Events land in your dashboard before the user's next keystroke. No 30-second batching, no lag.

Full stack traces

Symbolicated against your sourcemap. Every frame links to the exact line in your repo.

01renderCart()

02CartSummary.render()

03formatCurrency()

04▸ TypeError @ line 148

Session timeline

See the last 60 seconds before the crash — every click, network call and console log, replayed frame by frame and linked straight to the error.

00:42

01:28

Anomaly detection, out of the box

Baselines every release automatically. Anomalies surface in your live stream the moment something breaks — paging integrations coming soon.

Framework native

First-class support for React, Vue, Svelte, Next, Remix, Astro and vanilla.

react@18 next@14 vue@3 svelte remix astro

// app atlas - professional

The map your users draw
just by using your product.

App Atlas turns the routes your users actually visit into a living map — per-route screenshots, the named flows they follow, and one click straight to the session replay behind any step.

Per-route screenshots. Every visited route is captured and thumbnailed, straight from real sessions.
Named user flows. The paths people actually take, surfaced and labelled — not diagrammed by hand.
Jump to replay. Land on any node and open the exact session that walked it.

Built entirely from your existing pageview data — zero SDK change, zero integration. Available on the Professional plan, including the new Task Map view — your business tasks as semantic flows, with outcomes and completion rates.

See the Professional plan →

App Atlas 14 screens - 19 flows last 30d

Browse plans -> Activation complete Landing -> Customer book Payment -> Retry

// 1 SDK · 7 adapters

First-party adapters for
every framework you ship.

Drop-in error boundaries, navigation breadcrumbs, and route-handler wraps — all peer-only on the framework you already use. Apache-2.0, npm provenance, CycloneDX SBOM on every release.

React

on npm

Error boundary, hooks, HOC, React Router instrumentation.

$ npm i @browsonic/react Read the docs →

Vue 3

on npm

Plugin, <BrowsonicErrorBoundary>, composables, Vue Router instrumentation.

$ npm i @browsonic/vue Read the docs →

Svelte

on npm

SvelteKit handleError, store-driven user identity, navigation breadcrumbs.

$ npm i @browsonic/svelte Read the docs →

Next.js

on npm

App Router error pages, route handler wrap, Pages Router companions.

$ npm i @browsonic/nextjs Read the docs →

Astro

on npm

View Transitions breadcrumbs + integration auto-injection.

$ npm i @browsonic/astro Read the docs →

Angular

on npm

ErrorHandler drop-in, BrowsonicService, Router instrumentation.

$ npm i @browsonic/angular Read the docs →

Remix

on npm

Route ErrorBoundary, action + loader wrappers, entry.client helper.

$ npm i @browsonic/remix Read the docs →

Migrating from Sentry or TrackJS ? The mapping is almost one-to-one — most teams complete the move in under an hour.

// one line

Two minutes from npm install to live errors.

Install @browsonic/sdk, point init() at your endpoint, ship. Browsonic auto-instruments fetch, XHR, history, console and unhandled rejections automatically.

✓
Zero-dependency SDK core, gzipped small. Loads asynchronously, never blocks first paint.
✓
Source maps, uploaded on build. @browsonic/build-tools plugins for Vite, Webpack, Rollup and esbuild.
✓
SOC 2 Type II & GDPR. PII scrubbing happens in the SDK, before the event ever leaves the browser.

app.tsx browsonic.config.ts vite.config.ts ● saved

1 // register opt-in plugins, then init. 2 import { getBrowsonic, webVitalsPlugin } from '@browsonic/sdk' 3 import { sessionReplayPlugin } from '@browsonic/sdk/replay' 4 5 const sdk = getBrowsonic() 6 sdk.register(webVitalsPlugin()) 7 sdk.register(sessionReplayPlugin()) 8 9 sdk.init({ 10 apiEndpoint: 'https://api.browsonic.com', 11 appKey: 'web', 12 apiKey: 'pk_live_…', 13 clientVersion: '1.0.0', 14 })

47ms

median ingest latency

2.4 kB

gzipped agent size

99.99%

ingest uptime, last 12mo

3.2 B

events processed this week

// pricing

Simple, usage-based pricing.

Start free forever. Scale as your traffic grows. No per-seat fees, no gotchas — and save 30% on annual plans.

Monthly Yearly SAVE 30%

Free

Solo developer kicking the tyres — 1 app, very tight limits.

$0 /mo

Start for free

✓ 5,000 events / month
✓ 1 app, 1 environment
✓ 7-day retention
✓ 1 team member
✓ Community support

Starter

For small SaaS and agencies. Real-time + threshold alerts with webhook delivery — no enterprise gates.

Launch offer

$19.99 /mo

Get started

✓ 100,000 events / month
✓ 3 apps, 5 team members
✓ 14-day retention
✓ Real-time anomaly stream (in-app)
✓ Threshold alerts with webhook delivery
✓ Email support

Professional

Full SaaS package for teams shipping in production.

$349 /mo

Get started

✓ 1,000,000 events / month
✓ 25 apps, 25 team members
✓ 90-day retention
✓ Source maps + symbolication
✓ Session replay — full-fidelity DOM playback, seek-to-error
✓ App Atlas — auto-mapped route graph, zero integration
✓ Atlas Task Map — semantic task flows with outcomes & completion rates
✓ Jira integration (Slack, PagerDuty, Linear coming soon)
✓ REST + Webhook API access
✓ Priority support, 99.9% SLA

Enterprise

For teams with custom volume, compliance and self-hosting needs.

Let's talk

Contact sales

✓ Custom event volume
✓ Everything in Professional — Session replay + App Atlas at full sample
✓ SSO (SAML / OIDC)
✓ RBAC + audit log
✓ Self-hosted (BYOC) option
✓ SOC 2 + HIPAA BAA, custom DPA
✓ Dedicated CSM, 99.95% SLA

Stop finding out from users.

Start free. No credit card. Live data in under two minutes.

Start free Book a demo

Every error, every frame, with the context to fix it.

Millisecond ingest

Full stack traces

Session timeline

Anomaly detection, out of the box

Framework native

The map your users draw just by using your product.

First-party adapters for every framework you ship.

React

Vue 3

Svelte

Next.js

Astro

Angular

Remix

Two minutes from npm install to live errors.

Simple, usage-based pricing.

Free

Starter

Professional

Enterprise

Stop finding out from users.

Every error, every frame,
with the context to fix it.

The map your users draw
just by using your product.

First-party adapters for
every framework you ship.