LangSmith vs Replit
LLM observability, testing & evaluation — by LangChain
vs. AI-native online IDE + agent that builds, deploys and hosts full apps
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
Replit
Free Starter
$0. 3 public Repls, 500MB storage, limited Agent credits. Community tier.
Free
Core
$15/mo (or $180/yr). $25 Agent credits, 10GB storage, unlimited private repls. Best indie hacker tier.
$15/mo
Teams
$40/user/mo. Shared workspaces, org-level credit pool, role-based access.
$40/mo
Enterprise
Custom. SSO, SAML, SCIM, dedicated support, audit logs, air-gapped deploys.
Custom
Free-tier quotas head-to-head
Comparing developer on LangSmith vs free on Replit.
| Metric | LangSmith | Replit |
|---|---|---|
| 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.
Replit · 19 features
- Assistant (chat) — AI code chat + edits.
- Autoscale Deployments — Serverless functions.
- Ghostwriter (legacy) — Older AI completion.
- Mobile App — Full IDE on iOS + Android.
- Object Storage — File hosting.
- Real-time Collaboration — Multi-cursor + voice.
- Replit Agent — Autonomous AI that builds full apps.
- Replit Bounties — Marketplace for paid dev tasks.
- Replit Database — Built-in key-value DB.
- Replit for Education — Classroom + assignment features.
- Reserved VM — Always-on deploy.
- Scheduled Jobs — Cron-triggered runs.
- Secrets Manager — Env variables.
- SSO (Enterprise) — SAML + OIDC.
- Static Deployments — Frontend / SSG hosting.
- Teams / Orgs — Shared workspaces + admin.
- Template Gallery — 100,000+ starter templates.
- Universal Package Manager — npm, pip, gem, etc. auto-installed.
- Web IDE — Monaco-based online editor.
Developer interfaces
| Kind | LangSmith | Replit |
|---|---|---|
| CLI | LangSmith CLI | replit CLI |
| SDK | langsmith-js, langsmith-python | — |
| REST | LangSmith REST API | — |
| GRAPHQL | — | Replit GraphQL (partial) |
| MCP | LangSmith MCP | — |
| OTHER | LangSmith Dashboard | Replit Agent, Replit Database, Replit Deployments, Replit Mobile, Replit Teams, Replit Web IDE |
Staxly is an independent catalog of developer platforms. Some links to LangSmith and Replit may be affiliate links — Staxly may earn a commission if you sign up through them, at no extra cost to you. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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