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.
This comparison is generated from the sourced Bolt.new and LangSmith profiles. Open either profile to review its evidence and last-reviewed date.