Langfuse vs Better Stack
Open-source LLM engineering platform — observability, prompts, evals
vs. Observability + uptime + incident management in one — modern alternative to Datadog
Pricing tiers
Langfuse
Hobby (Cloud Free)
Free. 50k units/month included. 30 days data access. 2 users. Community support.
Free
Self-Hosted (OSS)
MIT-licensed. Docker Compose or Kubernetes deployment. Unlimited.
$0 base (usage-based)
Core
$29/month. 100k units included ($8 per 100k overage). 90 days retention. Unlimited users. In-app support.
$29/mo
Pro
$199/month. 100k units included + same overage. 3 YEARS retention. Unlimited annotation queues. High rate limits.
$199/mo
Teams Add-on
+$300/month. Adds Enterprise SSO + fine-grained RBAC + dedicated Slack support to Pro.
$300/mo
Enterprise
$2,499/month. Everything + custom rate limits, uptime SLA, dedicated support engineer. Yearly options.
$2499/mo
Better Stack
Pay-as-you-go
Ingest $0.15/GB, retention $0.08/GB/month. Metrics $0.75/GB/month.
$0 base (usage-based)
Free
10 monitors + heartbeats, 1 status page. 3GB logs @ 3-day retention. 30GB metrics. 100K exceptions/mo. 5k session replays.
Free
Telemetry — Nano
$30/mo ($25 annual). 40 GB logs/traces/metrics. 30-day retention.
$30/mo
Responder License
$34/mo ($29 annual) per responder. Unlimited phone + SMS alerts. Required for on-call.
$34/mo
Telemetry — Micro
$120/mo. 160 GB.
$120/mo
Telemetry — Mega
$250/mo. 340 GB.
$250/mo
Telemetry — Tera
$500/mo. 700 GB.
$500/mo
Free-tier quotas head-to-head
Comparing hobby on Langfuse vs free on Better Stack.
| Metric | Langfuse | Better Stack |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
Features
Langfuse · 16 features
- Annotation Queues — Human reviewers rate traces. Unlimited on Pro+.
- Dashboards — Aggregate metrics, cost, quality across projects.
- Datasets — Curate test sets from production traces. Run experiments.
- EU Cloud Region — GDPR-compliant hosting in EU.
- Evaluations — LLM-as-judge, manual scores, custom model-graded evaluators.
- LLM Cost Tracking — Automatic cost calculation per provider/model.
- OpenTelemetry Native — OTel SDK → Langfuse endpoint works out of box.
- Playground — Test prompts + models + variables live.
- Prompt Management — Version, tag, label prompts. Reference from code by label.
- Public API — Full REST API for ingest, query, prompt management.
- Python @observe decorator — One-line decorator to trace any function.
- Self-Hosting — Docker Compose + k8s Helm chart.
- Sessions — Group related traces (conversations, agent runs).
- Tracing — Capture every LLM call, tool call, nested span with inputs/outputs/cost.
- Users Tracking — Segment traces by user ID, track per-user cost.
- Webhooks — Subscribe to trace completion events.
Better Stack · 13 features
- Dashboards — SQL + chart-based dashboards.
- Distributed Tracing — OpenTelemetry traces with span analysis.
- Error Tracking — Sentry-style error capture per $0.000075/exception.
- Heartbeats (Cron) — Dead-man-switch style alerts for cron/scheduled jobs.
- Logs (formerly Logtail) — Centralized structured logging with live tail + SQL.
- Metrics — Prometheus-compatible metrics ingest + visualization.
- On-Call & Incidents — Schedules, escalations, incident response with postmortems.
- Phone + SMS Alerts — Unlimited phone + SMS on Responder license.
- Reporting & Analytics — +$5/member/month add-on.
- Session Replay — Integrated with error events.
- SQL Queries over Logs — ClickHouse-backed SQL on all ingested telemetry.
- Status Pages — Hosted status pages with custom domain + brandable.
- Uptime Monitoring — HTTP, keyword, ping, TCP, UDP monitors. Global checkpoints.
Developer interfaces
| Kind | Langfuse | Better Stack |
|---|---|---|
| SDK | langfuse-js, langfuse-python | logtail-ruby, pino-logtail / winston transport, python-logtail |
| REST | Langfuse REST API | Better Stack REST API, Telemetry API |
| MCP | Langfuse MCP Server | — |
| OTHER | Langfuse Dashboard, OpenTelemetry endpoint | OTLP (OpenTelemetry), Webhooks |
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