# STRING (string-db.org)

Builds protein-protein interaction networks from known and predicted associations and runs functional enrichment on submitted protein lists.

- Atlas card: https://inite.ai/en/atlas/string-db.org
- Site: https://string-db.org
- For: Biologists and bioinformaticians studying protein interactions and functional enrichment in gene or protein lists
- Categories: analytics
- Use 37/100 · alive 100/100

## Used for

- look up a protein's interaction network by name
- run enrichment analysis on a ranked protein list
- build an interaction network from protein sequences

## Price

- no price printed, no free plan (read 2026-10-15 on https://string-db.org/pricing/)

## For developers

- API docs: https://string-db.org/cgi/access
- MCP server: org.string-db/string-mcp (namespace; open on 2026-10-15, 17 tools)
- Read 2026-10-15

## MCP server, measured daily

Server: https://mcp.string-db.org/, checked every day since 2026-10-19 (8 checks).

- Answered: 100% of daily checks
- Median first answer: 536 ms
- Sign-in: none
- Context its tool definitions take: about 9177 tokens (17 tools)
- Tool definitions: B, 83/100
- Failing "annotations": 17 of 17 tools
- Warning "open_writes": string_create_file
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-15

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Source: INITE Atlas, https://inite.ai/en/atlas/string-db.org. JSON: https://inite.ai/api/atlas/string-db.org. MCP: https://inite.ai/api/mcp (atlas_lookup).