# DeepSeek vs Langfuse

> DeepSeek: Free AI chat app and low-cost API running DeepSeek's open-weights V4 models
> Langfuse: Open-source platform to trace, evaluate and improve LLM applications and agents

- DeepSeek profile: https://finderatlas.com/tools/deepseek
- Langfuse profile: https://finderatlas.com/tools/langfuse
- Comparison page: https://finderatlas.com/compare/deepseek-vs-langfuse
- Last reviewed: November 2026

## Verdict

DeepSeek is listed under AI Assistants and Langfuse under Developer Tools. DeepSeek scores higher in FinderAtlas's editorial review (8.8 vs 8.4 out of 10), led by ease of use. Both have a free plan or trial. Only DeepSeek is available on Windows, macOS and iOS. Only Langfuse is available on CLI.

### Choose DeepSeek if

- You want a tool built for Low-cost API integration.
- Web chat and mobile apps are free.
- API output costs from $0.60 per 1M tokens (Flash, off-peak), well below most frontier providers.

### Choose Langfuse if

- You want a tool built for production tracing and debugging of LLM apps and agents, prompt versioning, and systematic evaluation on real data.
- MIT-licensed core with free self-hosting, avoiding vendor lock-in.
- Covers tracing, prompt management and evaluation in one platform.

## Pricing

| | DeepSeek | Langfuse |
| --- | --- | --- |
| Pricing model | Freemium | Freemium |
| Free plan or trial | Yes | Yes |
| Starting price | $0 | $0 |

## Features

| Feature | DeepSeek | Langfuse |
| --- | --- | --- |
| V4 model family | Yes | Not listed |
| Thinking mode | Yes | Not listed |
| Open weights | Yes | Not listed |
| OpenAI and Anthropic compatible API | Yes | Not listed |
| Tool calls and JSON output | Yes | Not listed |
| Search and Fetch APIs | Yes | Not listed |
| Agent tool integrations | Yes | Not listed |
| DeepSeek Harness | Yes | Not listed |
| Vision on Flash | Yes | Not listed |
| Tracing | Not listed | Yes |
| Evaluation | Not listed | Yes |
| Prompt Management | Not listed | Yes |
| Playground | Not listed | Yes |
| Datasets and Experiments | Not listed | Yes |
| Cost and Latency Dashboards | Not listed | Yes |
| Open-Source Self-Hosting | Not listed | Yes |
| APIs and MCP Servers | Not listed | Yes |

## Platforms

| Platform | DeepSeek | Langfuse |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | Yes | No |
| macOS | Yes | No |
| iOS | Yes | No |
| Android | Yes | No |
| API | Yes | Yes |
| Browser Extension | No | No |
| CLI | No | Yes |

## DeepSeek strengths

- Web chat and mobile apps are free
- API output costs from $0.60 per 1M tokens (Flash, off-peak), well below most frontier providers
- Open weights for V4 and earlier models on Hugging Face
- 1M-token context and 384K max output on both API models
- API works with both OpenAI and Anthropic SDKs and several coding agents

## DeepSeek limitations

- Peak-hour API rates are double the off-peak rates on weekday mornings UTC
- deepseek-v4-pro does not support vision input
- No image generation
- Data is processed by a company based in China, which some organizations cannot accept

## Langfuse strengths

- MIT-licensed core with free self-hosting, avoiding vendor lock-in.
- Covers tracing, prompt management and evaluation in one platform.
- Free Hobby tier with 50k units per month and no credit card required.
- Over 100 integrations, plus OpenTelemetry for languages without a native SDK.
- Core plan at $29/month with unlimited users.

## Langfuse limitations

- Hobby is limited to 2 users and 30 days of data access.
- SOC 2, ISO 27001 and HIPAA support start at the $199/month Pro plan, and SSO and RBAC need a $300/month add-on.
- Audit logs, SCIM and SLAs are restricted to the $2,499/month Enterprise plan.
- Usage-based unit overage adds cost for high-volume tracing.

## FAQ

**Is DeepSeek better than Langfuse?**

It depends on your workflow. DeepSeek is built for Low-cost API integration. Langfuse is built for production tracing and debugging of LLM apps and agents, prompt versioning, and systematic evaluation on real data.

**What are the key feature differences between DeepSeek and Langfuse?**

DeepSeek: Free AI chat app and low-cost API running DeepSeek's open-weights V4 models. Langfuse: Open-source platform to trace, evaluate and improve LLM applications and agents.

**Does DeepSeek or Langfuse have a free plan?**

Yes, both do. DeepSeek is freemium and Langfuse is freemium, and each has a free plan or trial.

**Which is cheaper, DeepSeek or Langfuse?**

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.