Langfuse vs Lemon Squeezy
Open-source LLM engineering platform — observability, prompts, evals
vs. Merchant of record for digital products and SaaS
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
Lemon Squeezy
Pay-as-you-go
No monthly fees. 5% + 50¢ per transaction. Includes tax handling.
$0 base (usage-based)
Free-tier quotas head-to-head
Comparing hobby on Langfuse vs payg on Lemon Squeezy.
| Metric | Langfuse | Lemon Squeezy |
|---|---|---|
| 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.
Lemon Squeezy · 12 features
- Abandoned Cart Recovery — Email retry campaigns (+5% fee on recovered).
- Affiliate Program — Built-in affiliate/referral program with payouts.
- Custom Checkout Domain — Checkout at checkout.yourbrand.com.
- Customer Portal — Self-service subscription + invoice management UI.
- Discounts / Coupons — Percentage / fixed / trial discount codes.
- Global Tax (included) — Automatic VAT/GST/sales tax calc + remittance. LS files taxes on your behalf.
- Hosted Checkout — Hosted + embeddable checkout. Customize color + logo.
- License Keys — Generate + validate license keys for software sales.
- One-off Sales — Digital products with license keys, file delivery.
- Reports & Analytics — Revenue, MRR, churn, LTV.
- Subscriptions — Recurring billing with trials, proration, discounts.
- Webhooks — Standard resource events (order_created, subscription_created/updated/cancelled,…
Developer interfaces
| Kind | Langfuse | Lemon Squeezy |
|---|---|---|
| SDK | langfuse-js, langfuse-python | @lemonsqueezy/lemonsqueezy.js |
| REST | Langfuse REST API | Lemon Squeezy REST API |
| MCP | Langfuse MCP Server | — |
| OTHER | Langfuse Dashboard, OpenTelemetry endpoint | Webhooks |
Staxly is an independent catalog of developer platforms. Outbound links to Langfuse and Lemon Squeezy are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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