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Langfuse vs PostHog: AI Search & MCP Readiness
Category: LLM Tracing vs Product Analytics · Measured UTC via aso-live-probe
Measured verdict: Langfuse leads PostHog by 17 points (60/100 B vs 43/100 D) across ASO Studio’s 47-check HTTP, 29-crawler robots.txt, Markdown (/llms.txt, /pricing.md), MCP, OpenAPI, and Schema.org JSON-LD benchmark. Full individual grade-cards: langfuse.com (60/100) · posthog.com (43/100).
Scope & limits: Side-by-side HTTP status codes and HTML structured data captured 2026-11-14 UTC; independent audit not affiliated with Langfuse or PostHog. Technical readiness does not guarantee AI citations or sales.
1. Side-by-Side HTTP & Agent Discovery Telemetry
| Signal / Endpoint | langfuse.com | posthog.com |
|---|---|---|
| ASO Score & Grade | 60/100 (B) | 43/100 (D) |
| Cohort Rank | #43 | #34 |
| Edge TTFB · HTML | 100ms · 254 KB (39 scripts) | 43ms · 254 KB (0 scripts) |
/robots.txt (29 Bots) | 200 · 29/29 (4 explicit) | 200 · 29/29 (2 explicit) |
/sitemap.xml | 200 | 200 |
/llms.txt | 200 | 200 |
/llms-full.txt | 404 | 404 |
/pricing.md | 200 | 200 |
/.well-known/ai.txt | 404 | 404 |
/ai/summary.json | 404 | 404 |
/.well-known/mcp.json | 200 | 404 |
/.well-known/agent-card.json | 404 | 404 |
/.well-known/openapi.json | 404 | 404 |
JSON-LD @types | Organization, WebSite | SoftwareApplication, Offer, Organization, PostalAddress |
2. Where Langfuse Leads vs Where PostHog Leads
Where Langfuse (langfuse.com) leads:
- Overall 47-check readiness score (60/100 B vs 43/100 D)
- Serves live
/.well-known/mcp.json(HTTP 200vsHTTP 404) - Explicitly allowlists 4 AI crawlers in
/robots.txt(vs 2)
Where PostHog (posthog.com) leads:
- Faster root edge response (43ms TTFB vs 100ms)
- Richer root Schema.org JSON-LD (4 types vs 2)
Shared discovery gaps: Both langfuse.com and posthog.com currently return non-200 responses on /llms-full.txt (404/404), /.well-known/ai.txt (404/404), /.well-known/agent-card.json (404/404), /.well-known/openapi.json (404/404).
One-time $49 · 26 files · Base USDC or Monero · no signup
Download free 3-file starter for posthog.com (.txt) · EdgeScreen x402 ($0.002)
23 remaining production files
/.well-known/mcp.json, agent-card.json, openapi.json, llms-full.txt, pricing.md, answers.md, ai/*.json
Schema.org JSON-LD bundle, Cloudflare Worker edge headers, comparisons, GitHub Action CI verifier.
3. Compare Against Your Own Domain (Free Live Probe)
4. Self-Serve 26-File ASO Pack ($49)
Generate a tailored 26-file /llms-full.txt, /pricing.md, 29-crawler robots.txt, Schema.org @graph, and 14-route Edge Router .zip for posthog.com or any domain you operate. Instant browser download via USDC on Base (Chain 8453), or Monero (XMR — verified within 24h) via non-custodial Trocador AnonPay. Inspect free sample .zip · Terms · EdgeScreen x402 ($0.002 USDC).
5. More Head-to-Head Readiness Comparisons
- PostHog vs Sentry (43/100 vs 79/100)
- Langfuse vs Braintrust (60/100 vs 69/100)
- Cloudflare vs Vercel (89/100 vs 73/100)
- Supabase vs Neon (79/100 vs 30/100)
- Supabase vs Convex (79/100 vs 75/100)
- Turso vs Upstash (76/100 vs 74/100)
- Fly.io vs Render (76/100 vs 87/100)
- Render vs Railway (87/100 vs 30/100)
All 60 head-to-head comparisons → · All 40 platform grade-cards →