Zero-instrumentation monitoring

See everything your
servers are doing.

aacyn monitors your apps and infrastructure — request rates, errors, response times — without touching your code.
It runs on your hardware, so your data stays yours.
Starts free. Full engine for $4/mo.

See the benchmarks

What is aacyn?

A monitoring tool that watches your servers from the operating system level — no SDKs to install, no code changes, no cloud account required.

🔍

Monitor

See every request, error, and slow response across your services. aacyn uses a Linux technology called eBPF to observe traffic at the kernel level — no agents or SDK installs needed.

🏠

Self-hosted

Runs on your hardware — a mini PC, a server rack, or a Docker container. Your telemetry data never leaves your network. No cloud vendor lock-in.

💸

Flat pricing

No per-host fees. No per-GB surcharges. No surprise invoices. The free tier gives you everything you need to start. $4/mo unlocks advanced features.

30sto first dashboard

0lines of code to change

$0to get started

See inside your Docker stack in 30 seconds

Add one service to your docker-compose. The dashboard lights up automatically — every connection between your containers appears without touching a single line of application code.

services:
  # ... your existing services ...

  aacyn:
    image: ghcr.io/aacyn/sidecar:latest
    privileged: true
    pid: host
    ports:
      - "3001:3001"  # Dashboard

aacyn dashboard showing real-time topology graph with Golden Signals metrics

Real dashboard output — nginx → node → postgres topology discovered automatically via eBPF.

Ingest millions of events per second

Most monitoring tools parse JSON on every incoming request, which limits throughput. aacyn also accepts a compact binary format that skips parsing entirely — the bytes from your HTTP request go straight into storage.

The result: over 5 million events per second on a single box. That's 16× faster than JSON-only ingestion.

5,089,364events/secon a Ryzen 9 mini PC — no cloud cluster needed

286μsto scan 5 million eventsusing CPU vector instructions (SIMD) on a single core

Query 5 million events in under a millisecond

aacyn stores data in a format optimized for analytics — instead of reading entire rows, it reads only the columns you need. Combined with modern CPU acceleration, this makes searching, filtering, and aggregating nearly instant.

Your data never leaves your network.

aacyn runs on your hardware and stores everything locally. There is no cloud backend. The only outbound request is a daily license check — a 200-byte ping that contains no telemetry data.

Simple, honest pricing

Start free. Upgrade when you need advanced features. No per-host fees, no per-GB bills, no surprises.

Feature	Free $0	Sovereign $4/mo
Real-time dashboard	✓	✓
Auto-discovery (eBPF)	✓	✓
JSON event ingestion	✓	✓
Golden Signals (rate, errors, latency)	✓	✓
Binary ingestion (5M+ events/sec)	—	✓
Cold storage archival (S3/R2)	—	✓
Grafana plugin	—	✓
Priority support	—	✓

Your data never leaves your network. Cancel anytime.