LangSmith
8.0#1 in llm gateway software$39 usage-basedFree planWebAPILinuxmacOS
VisitLangSmith vs SpacePrompts
SpacePrompts
7.4#3 in prompting toolFrom $5 a monthFree planWebAPIExtension
VisitWhat both publish
| Fact | LangSmith | SpacePrompts |
|---|---|---|
| Evaluation | Evaluation supports offline datasets, online production evaluations, human annotation queues and side-by-side experiment comparison. | The Evaluator scores prompts, identifies weak areas, and offers guidance to improve them. |
| Founded | 2023 | SourceForge lists the company as founded in 2025. |
| Integrations | Documented integrations cover OpenAI, Anthropic, Bedrock, Gemini, Mistral, LiteLLM, OpenTelemetry, CrewAI, Vercel AI SDK, PydanticAI, AutoGen and many other frameworks and providers. | The privacy policy lists Google, GitHub, and Microsoft as OAuth providers for account authentication. |
LangSmith plans
- DeveloperFree
- Plus$39 a month
- EnterprisePriced on request
SpacePrompts plans
- FreeFree
- Pro$5 a month
- Team$9 a month
Pick LangSmith if…
LangSmith suits teams building or operating AI agents that need evaluation, prompt workflows, and observability. It supports both hosted and self-hosted deployment options.
Pick SpacePrompts if…
It suits people and teams who work with AI prompts, including designers, writers, marketers, and API automation users. Teams needing shared libraries and role-based permissions can consider the Team plan.