# DeepSeek vs Undermind

> DeepSeek: Free AI chat app and low-cost API running DeepSeek's open-weights V4 models
> Undermind: AI research assistant that searches, reads and cites scientific papers for literature reviews

- DeepSeek profile: https://finderatlas.com/tools/deepseek
- Undermind profile: https://finderatlas.com/tools/undermind
- Comparison page: https://finderatlas.com/compare/deepseek-vs-undermind
- Last reviewed: October 2026

## Verdict

DeepSeek and Undermind are both AI Assistants tools. DeepSeek scores higher in FinderAtlas's editorial review (8.8 vs 7.7 out of 10). Both have a free plan or trial. Only DeepSeek is available on Windows, macOS and iOS and offers an API.

### 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 Undermind if

- You want a tool built for deep literature reviews, finding hard-to-surface papers on a niche topic, and tracking new publications in a field.
- Built specifically for scientific literature, with citation-following and full-text reading.
- In-line citations let users trace claims to source papers.

## Pricing

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

## Features

| Feature | DeepSeek | Undermind |
| --- | --- | --- |
| 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 |
| Conversational Deep Search | Not listed | Yes |
| Citation Trail Following | Not listed | Yes |
| Cited Reports | Not listed | Yes |
| Full-Text Analysis | Not listed | Yes |
| Custom Tables | Not listed | Yes |
| Relevance Sorting and Filtering | Not listed | Yes |
| New Paper Alerts | Not listed | Yes |
| Workspaces and Libraries | Not listed | Yes |
| Agent Connections | Not listed | Yes |

## Platforms

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

## 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

## Undermind strengths

- Built specifically for scientific literature, with citation-following and full-text reading.
- In-line citations let users trace claims to source papers.
- Free tier available, with paid Pro at $16 per month billed annually.
- Alerts and libraries support ongoing tracking of a field, not just one-off searches.
- Can be connected to Claude, ChatGPT and other agents.

## Undermind limitations

- Exact usage limits are not published; Pro is only described as 10x Free.
- Not designed for general web research, news or non-technical topics.
- Web-only; no iOS or Android app was found.
- Published benchmark results are vendor-reported.

## FAQ

**Is DeepSeek better than Undermind?**

It depends on your workflow. DeepSeek is built for Low-cost API integration. Undermind is built for deep literature reviews, finding hard-to-surface papers on a niche topic, and tracking new publications in a field.

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

DeepSeek: Free AI chat app and low-cost API running DeepSeek's open-weights V4 models. Undermind: AI research assistant that searches, reads and cites scientific papers for literature reviews.

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

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

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

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