LangSmith vs RevenueCat
LLM observability, testing & evaluation — by LangChain
vs. Mobile subscription infrastructure — iOS + Android + web in one API
Pricing tiers
LangSmith
Developer (Free)
Free forever. 5,000 traces/month. 14-day retention. 1 seat. Basic evaluations.
Free
Plus
$39/seat/month. 10k base traces included ($2.50 per 1k overage). Full evaluations, custom dashboards, email support.
$39/mo
Enterprise
Custom. Self-host option, SSO, custom retention, dedicated support.
Custom
RevenueCat
Starter
$0. Free up to $2,500 MTR (monthly tracked revenue). All core features. Email support.
Free
Pro
$0 base + 1% of MTR above $2,500. All features + priority support + SLA.
$0 base (usage-based)
Enterprise
Custom. Volume discount, dedicated support, custom contract.
Custom
Free-tier quotas head-to-head
Comparing developer on LangSmith vs starter on RevenueCat.
| Metric | LangSmith | RevenueCat |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
Features
LangSmith · 14 features
- Alerts — Threshold alerts on latency, cost, eval metrics.
- Annotation Queues — Human-review workflows for trace quality rating.
- Custom Dashboards — Aggregate metrics dashboards per project/tag.
- Datasets — Collect examples → use as eval sets or training data.
- Evaluations — LLM-as-judge, embedding similarity, custom Python evaluators, offline batch eval…
- LangChain Integration — Auto-trace any LangChain/LangGraph run with env var.
- LangGraph Integration — First-class trace + eval for LangGraph agents.
- LLM Tracing — Automatic trace every LLM call + tool call + chain step.
- OpenTelemetry Export — Export traces as OTLP to Datadog/Honeycomb/etc.
- Playground — Test prompts + models inline before deploying.
- Prompt Canvas — Visual prompt editor with live test + eval.
- Prompt Hub — Public + private prompt library with versioning.
- Self-Hosted (Enterprise) — Docker + k8s deployment in your infra.
- Threads + Sessions — Group traces into conversational sessions.
RevenueCat · 13 features
- Audiences + Targeting — Target users by cohort, country, event.
- Charts — Cohort retention, LTV, MRR dashboards.
- Customer Center — Native UI for subscription management.
- Data Integrations — Push events to Mixpanel/Amplitude/Segment/etc.
- Entitlements — Server-authoritative feature unlocks independent of SKU.
- Experiments — Built-in A/B testing.
- Offerings + Packages — Remote product groupings + package targeting.
- Paywalls — Remote-configurable native paywall UI templates.
- Purchases — Unified purchase API across stores.
- Receipt Validation — Server-side App Store + Play receipt validation.
- Restore Purchases — Cross-device + reinstall restore.
- Web Billing (Stripe) — Accept subs via web with Stripe, reconcile with mobile.
- Webhooks — Subscription lifecycle events.
Developer interfaces
| Kind | LangSmith | RevenueCat |
|---|---|---|
| CLI | LangSmith CLI | — |
| SDK | langsmith-js, langsmith-python | RevenueCat Android SDK, RevenueCat Flutter, RevenueCat iOS SDK, RevenueCat React Native, RevenueCat Web Billing |
| REST | LangSmith REST API | RevenueCat REST API |
| MCP | LangSmith MCP | — |
| OTHER | LangSmith Dashboard | RevenueCat Dashboard, RevenueCat Webhooks |
Staxly is an independent catalog of developer platforms. Outbound links to LangSmith and RevenueCat are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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