segi
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// About

Built by a Korean team, for Korean teams.

segi is a focused observability platform for teams that want clarity without the weight of a full suite. It connects errors, health, and session signals from Next.js, NestJS, and JavaScript apps so the time to the first actionable issue is short.

What guides segi

  • Most errors do not need a sprawling dashboard. They need a clear stack trace and a link that gets you to the right place.
  • SDKs should never break the host application.
  • Customer data is sensitive. Protect it on both the client and the server.
  • Email alerts should only go to verified addresses.
  • Session recording is off by default; password, email, tel and number inputs are always masked.

Built for teams like these

Product teams shipping often
Use segi when you need to know which errors are affecting real customers right after a release.
Startups without a large ops team
Keep the operational signal you need without running a heavy observability stack before the team is ready for one.
Next.js and NestJS services
See browser events, server actions, API errors, and PM2 process health in one project workflow.

A real usage example

Right after a checkout release, segi catches the signal before customers start saying the payment button does nothing.

checkout-api · productionFATAL
TypeError: cannot read properties of undefined
events
142
users
38
release
v2.14.3
at CheckoutButton.onClick (/checkout:42)
tag.module = checkout
url = https://example.com/checkout

How data moves

01SDK
02Ingest API
03Issue grouping
04Session replay + heatmap
05Alert
06Fix release

See a real session, replayed

What did your user actually see? Replay the captured session below to find exactly which buttons went unclicked and which sections went unnoticed — all overlaid on the real page they were looking at.

Time segi helps you reduce

Time segi helps you reduceDetectSee new errors and health failures before waiting for user reports.
Time segi helps you reduceTriageGroup duplicate events into issues and prioritize by release, environment, and affected users.
Time segi helps you reduceResolveUse stack traces, breadcrumbs, request context, PM2 health, the user's last screen replayed at DOM fidelity, and click heatmaps overlaid on the real page — all from one focused console.
2023
Founded
6
Team
Seoul
HQ / region
120+
Customer teams

Stack

Next.js admin · NestJS API + worker · MySQL + Prisma · Redis + BullMQ · AWS SES for email.