All systems operational | 99.99% uptime

Build software that
never breaks.

Synthwave intercepts errors before your users notice. Real-time traces, smart alerts, and full context — zero config required.

$ npm install @synthwave/sdk
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Trusted by engineering teams at

Vercel Linear Supabase PlanetScale Turso Fly.io Render Railway Vercel Linear Supabase PlanetScale Turso Fly.io Render Railway

Find. Understand. Fix.

Synthwave surfaces the issue, shows you exactly what went wrong, and points you to the line of code that needs fixing.

01 — Detect

Instant Detection

Catches errors, unhandled rejections, and slow queries the moment they fire. Zero-config, sub-millisecond overhead.

340% error spike detected
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02 — Analyze

Root Cause in 2s

Traces the full request across services, workers, and APIs. Pinpoints the exact commit, file, and line.

gateway 42ms
auth 28ms
db 7ms
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03 — Resolve

Auto-Route & Fix

Assigns to the right owner via CODEOWNERS. Pings Slack or PagerDuty. MTTR drops from hours to minutes.

6m 21s
avg MTTR
14ms
alert latency
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P1 Broken Password Reset Link
12,881 users affected
Event Timeline
Issue detected
14:32:01 UTC · Error rate spiked 340%
Root cause identified
14:32:03 UTC · Staging URL in production config
Assigned to @maya
14:32:04 UTC · Auto-routed via CODEOWNERS
Resolved
14:38:22 UTC · MTTR: 6m 21s
Source · auth/reset.ts
7  const baseUrl = config.urls
8    [process.env.NODE_ENV]
9  -   .replace('https', 'http')
10 +   // protocol already correct
11
12 const resetLink =
13   `${baseUrl}/auth/reset?token=${token}`
Synthwave cut our mean time to resolution from 45 minutes to under 7. It's not a nice-to-have anymore — it's infrastructure.
Maya Chen
CTO, Profound

Every error,
in real time.

Watch your production environment in real time. Errors, warnings, and deployments — all in one stream.

Live Error Stream
LIVE
ERR 14:32:01.204 TypeError: Cannot read property 'user' of undefined api/auth.ts:47
WRN 14:32:01.891 Rate limit approaching: 87% of quota used middleware/rate.ts:12
INF 14:32:02.117 Deployment detected — new session: v2.4.1 core/lifecycle.ts:3
ERR 14:32:02.553 UnhandledPromiseRejection: fetch failed lib/client.ts:91
WRN 14:32:03.008 Slow query detected: 2340ms on users table db/query.ts:228
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Three lines to
full observability.

Drop Synthwave into any Next.js, Express, or FastAPI app. No agent. No YAML. Just import and ship.

instrumentation.ts
// Runs once at server startup
import Synthwave from '@synthwave/sdk'

export async function register() {
  if (process.env.NEXT_RUNTIME === 'nodejs') {
    await Synthwave.init({
      dsn: process.env.SYNTHWAVE_DSN,
      tracing: true,
      release: process.env.NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA,
    })
  }
}
global-error.tsx
"use client"

import * as Synthwave from '@synthwave/nextjs'
import NextError from 'next/error'
import { useEffect } from 'react'

export default function GlobalError({ error }: { error: Error }) {
  useEffect(() => {
    Synthwave.captureException(error)
  }, [error])

  return (
    <html><body>
      <NextError statusCode={500} />
    </body></html>
  )
}
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Pay for what you
actually use.

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  • Distributed tracing
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