LangSmith vs Penpot
LLM observability, testing & evaluation — by LangChain
vs. Open-source design + prototyping platform — Figma alternative, self-hostable
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
Penpot
Free (Cloud)
$0. Unlimited files, unlimited projects, unlimited users. Full feature set.
Free
Self-Hosted (OSS)
Free forever. MPL 2.0 license. Docker Compose deploy. Full feature parity with cloud.
$0 base (usage-based)
Enterprise
Custom. Self-hosted support contract, SLA, training.
Custom
Free-tier quotas head-to-head
Comparing developer on LangSmith vs free on Penpot.
| Metric | LangSmith | Penpot |
|---|---|---|
| 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.
Penpot · 16 features
- Accessibility Checks — Contrast + color blindness.
- Animations — Transitions + effects.
- Auto Layout — Responsive components.
- Comments — In-file discussion.
- Components + Variants — Reusable elements.
- Design Canvas — Vector drawing + layout.
- Design Tokens (W3C) — Named design variables.
- Figma File Import — Migrate from Figma.
- Flex + Grid Layout — Layout constraints.
- Inspector + Code Export — CSS/HTML/React/Flutter code.
- Native SVG — Not a proprietary blob.
- Plugins API — Extend Penpot.
- Prototyping — Interactive flows.
- Self-Host (MPL-2.0) — Docker deploy.
- Shared Libraries — Team asset libraries.
- Version History — File revisions.
Developer interfaces
| Kind | LangSmith | Penpot |
|---|---|---|
| CLI | LangSmith CLI | — |
| SDK | langsmith-js, langsmith-python | Penpot Plugins API |
| REST | LangSmith REST API | — |
| MCP | LangSmith MCP | — |
| OTHER | LangSmith Dashboard | Desktop App, Export + Inspect, Penpot Web, Self-Host (Docker) |
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