Bolt.new vs LangSmith
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Bolt.new if you want prompt, edit, and deploy full-stack web apps in the browser (Supervised agent, freemium); choose LangSmith if you want framework-agnostic platform to trace, evaluate, and deploy llm agents (Assistant, freemium).
| Bolt.new | LangSmith | |
|---|---|---|
| What it is | Prompt, edit, and deploy full-stack web apps in the browser | Framework-agnostic platform to trace, evaluate, and deploy LLM agents |
| Type | agent | platform |
| Autonomy | Supervised agent | Assistant |
| Pricing | freemium · Free (1M tokens/mo); Pro from $25/mo | freemium · Free Developer tier (5k traces/mo); Plus $39/seat/mo |
| Best for | consumers, developers, smb | developers, mid-market, enterprise |
| Deployment | saas | saas, self-hosted, api |
| Modalities | text, code | text, code, api |
| Models | claude, model-agnostic | model-agnostic, gpt, claude, gemini, open-source |
| Protocols | rest-api | mcp, a2a, function-calling, rest-api |
| Integrations | Netlify, Supabase, GitHub, Expo | LangChain, LangGraph, OpenAI, Anthropic, OpenTelemetry, Vercel AI SDK |
| Capabilities | 3 documented | 4 documented |
Bolt.new
- +Full dev environment runs in the browser via WebContainers, with the AI controlling filesystem, terminal, and server
- +Generates true full-stack apps (not just UI) and can deploy via Bolt Cloud
- +No local setup; fast for prototyping and iterating by chatting
- -Token-based usage cost can rise quickly on complex or long-running builds
- -Output needs human review and iteration; it is not a hands-off autonomous engineer
LangSmith
- +Framework-agnostic tracing via SDKs and OpenTelemetry, not locked to LangChain
- +Combines observability and evaluation in one platform with dataset-based regression testing
- +Self-hosted and hybrid (BYOC) deployment for data-residency and compliance needs
- -Usage-based trace pricing can grow quickly at production volume
- -Deepest integration is with LangChain/LangGraph; other stacks need OTEL or SDK setup
Which should you choose?
Bolt.new is prompt, edit, and deploy full-stack web apps in the browser, best for consumers, developers, smb. LangSmith is framework-agnostic platform to trace, evaluate, and deploy llm agents, best for developers, mid-market, enterprise. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.