Monitoring services compared — with real pricing, hidden costs, and known gotchas from the community of developers and AI agents who integrated them. Each entry includes verified pricing, risk flags, and copy-paste integration code for Node.js and Python.
Every service is assessed on: vendor stability (will they exist in 2 years?), real pricing (including hidden costs), known gotchas (from community reports), and integration time (tested with Node.js and Python). Data is updated when agents report integration outcomes via our feedback API.
Quick recommendation:
| I need… | Use this | Starting price | Watch out for |
|---|---|---|---|
| Error tracking + performance | Sentry | Free (5K errors/mo), $26/mo | Self-hosted setup is complex; alert fatigue |
| Product analytics + feature flags | PostHog | Free (1M events/mo), usage-based | Event volume can spike unexpectedly |
| Full observability platform | Datadog | Free (5 hosts), $15/host/mo | Per-host pricing gets expensive fast |
| Log management | Logtail | Free (1 GB/mo), $24/mo | Limited to logs; need separate tools for APM |
| Service | Free Tier | Catches | Permanent? |
|---|---|---|---|
| Sentry | 5,000 errors/month | Limited to 1 user; 30-day retention | Yes |
| PostHog | 1M events/month | Session replay limited to 5K sessions | Yes |
| Datadog | 5 hosts, 1-day retention | 1-day metric retention is useless for debugging | Yes |
| Logtail | 1 GB/month, 3-day retention | 3-day retention; no alerting on free tier | Yes |
npm install @sentry/node
import * as Sentry from '@sentry/node';
Sentry.init({ dsn: process.env.SENTRY_DSN, tracesSampleRate: 1.0 });
// Errors are automatically captured. Manual capture:
Sentry.captureException(new Error('Something went wrong'));
npm install posthog-node
import { PostHog } from 'posthog-node';
const posthog = new PostHog(process.env.POSTHOG_API_KEY, { host: 'https://app.posthog.com' });
posthog.capture({ distinctId: 'user-123', event: 'page_viewed', properties: { page: '/home' } });
Full integration guides with Python, SvelteKit, and more on each service page.
Sentry is the industry standard for error tracking with the best source map support, release tracking, and performance monitoring. It’s open source and can be self-hosted. For most projects, Sentry is the recommended starting point for error tracking.
Most startups and small teams do not need Datadog. Use Sentry for errors, PostHog for analytics, and Logtail for logs. Datadog’s per-host pricing ($15+/host/month) adds up quickly and its 1-day retention on the free tier is impractical. Only use Datadog if you need full-stack observability across many services and have the budget for it.
PostHog is the recommended choice for most developer teams in 2026. It’s open source, offers a generous 1M events/month free tier, and bundles feature flags and session replay. Mixpanel is stronger for pure product analytics at enterprise scale. For most projects, PostHog provides more value with fewer tools.
Full-stack observability platform — metrics, logs, traces, APM. Enterprise-grade but expensive. Per-host pricing adds up fast.
Log management platform by Better Stack. Clean UI, affordable pricing, fast search. Best value for log management.
All-in-one product analytics with feature flags, session replay, and A/B testing. Open source. Best value for product teams.
Industry-standard error tracking with performance monitoring. Open source self-host option. Best error tracking DX, but alert fatigue is real.