Frontend + backend observability

See the click.
And the stack trace.

SimpleLogs records the user's session and your server's logs as one timeline — then tells you which moments actually cost you customers.

session · acme-corp · 0:15.9

Session replay

Same session · same clock

0:12.4clientclickcheckout/submit
0:12.4clientrage click×4 in 900ms
0:12.5serverPOST/api/checkout
0:15.5serverdb timeout3000ms exceeded
0:15.6server500checkout/submit
0:15.9clienterror shown“Try again”

Your users and your servers are not two different stories.

But every other tool makes you treat them that way — and you end up matching timestamps by hand at 2am.

Session replay tools

Show you the user rage-clicking. Silent on the query that timed out behind it.

APM and log tools

Show you the 500. Silent on the four people who gave up and churned.

SimpleLogs

One record. The click and the stack trace, on the same clock, in the same view.

From raw events to the thing you should fix

Four stages, one product.

01

Capture

One SDK instruments your client and your server. No second vendor, no second bill.

02

Correlate

Session identifiers propagate across the network boundary automatically, so every server log already knows which user it belongs to.

03

Understand

Frustration scoring, AI-labeled clusters, and flow analysis turn raw events into a ranked list of what actually hurt.

04

Act

Alerts fire on the signals you care about, and every one opens straight into the session that caused it.

Everything in one place

No add-ons, no second vendor to correlate against.

Capture

Structured logging

Hierarchical, searchable logs with rich metadata — from category down to a single event.

Performance timings

p50, p95, and p99 latency for every touchpoint, with trends and category rollups.

Client and server

The same API on both sides. Browser events and backend traces land in one store.

Correlate

Session replay

Watch exactly what the user did, in the session behind the error you're investigating.

Synced timeline

Logs, timings, console output, and network calls replay in lockstep with the video.

Metadata search

Attach usernames, orgs, or plan tiers to a session and filter to exactly who you care about.

Understand

Frustration scoring

Rage clicks, dead clicks, scroll thrash, and form abandonment scored 0–100 per session.

AI-labeled clusters

Similar frustration signals group automatically and get a plain-English name.

Flow analysis

See what typically leads into a touchpoint and what follows it, across every session.

Act

Email alerts

Threshold alerts on latency, error volume, and frustration — routed to your team.

One-click replay

Any log entry jumps to the moment it happened, a beat before the failure.

Investigation timeline

Drop into any event and see the full sequence around it — the ±window, filtered to that user's session.

Instrumented in minutes

Pick your stack. Frontend and backend packages pair up and correlate on their own.

Showing the Next.js quickstart

1

Install

npm i @simplelogs/next

One package for both runtimes.

2

Wrap your layout

<SimpleLogsProvider config={{ serverKey, clientKey }} > {children} </SimpleLogsProvider>

Configures the server and client in one step.

3

Log from anywhere

serverLogger.log({ touchpoint: 'checkout/submit', level: 'error' })

The same call works in a route handler or a component.

One package covers your client and your server. Full guides

Stop guessing which bug cost you a customer

Connect your frontend and backend in under five minutes.

5,000 log events / monthUnlimited touchpointsNo credit card