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PlyDB

Free#18 of 24 in Data Federation Software

PlyDB: A free local option for joining files, databases, object storage, and SaaS data with SQL. Ranked #18 of 24 in Data Federation Software by our editors (7.1/10); pricing: Free plan; best for free local federation across files and databases.

7.1/10Editor score
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PlyDB7.1 Visit PlyDB

At a glance

  • Editor score
    7.1 / 10
  • Pricing
    Free plan
  • Best for
    Free local federation across files and databases
  • Free plan
    Yes
  • Paid from
    Free
  • Cloud hosted
    No
  • Facts checked
    20 Sep 2026
PlyDB screenshot

  • Where it wins

    • Federated SQL joins across databases, files, S3, and Google Sheets
    • Queries PostgreSQL, MySQL, SQLite, DuckDB, CSV, JSON, Parquet, and Excel
    • MCP server and CLI integrations support AI-agent workflows

  • Where it doesn't

    • Runs locally rather than as a hosted cloud service
    • Read-only operation by default limits write-oriented workflows
    • Agent connectivity centers on MCP and CLI rather than general API access

Our verdict on PlyDB

PlyDB is an open-source database gateway for querying live data across multiple sources from a local single binary. It is aimed at teams and AI-agent workflows that need federated analytics without building an ETL pipeline or data warehouse. Supported sources include PostgreSQL, MySQL, SQLite, DuckDB, CSV, JSON, Parquet, Excel, Amazon S3, and Google Sheets. Queries use standard SQL, with cross-source JOINs available across databases, files, object storage, and SaaS sources.

Its strongest differentiator is the breadth of data it can bring into one query without moving the underlying data. Semantic context discovery and persistent overlays add context to connected sources, while the MCP server and CLI provide defined paths for AI-agent integrations. The Windows, macOS, and Linux coverage also makes the local deployment model practical across the major desktop platforms. Read-only operation by default provides a clear boundary for teams focused on analysis rather than data modification.

PlyDB fits teams that want free, local, open-source federation and can work with a self-hosted binary. It is less suitable for organizations seeking a hosted cloud service, write-heavy workflows, or a broader application-integration layer beyond MCP and CLI connectivity. Buyers should also expect the product’s value to center on SQL federation and local access rather than managed infrastructure. Choose PlyDB when cross-source querying, semantic context, and AI-agent access matter more than cloud operations; choose an alternative when hosted deployment or general API access is central.

Your product? Our editors can test PlyDB in depth and publish a review, labelled as paid · from $149/mo →

PlyDB pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on plydb.com

PlyDB fact sheet

Free planYes
Paid fromFree
Cloud hostedNo
Self-hostedYes
SQL queryingYes
Query result cacheNot verified
Row-level securityNot verified
API accessNot verified
Scheduled queriesNot verified
DeploymentSelf-hosted, Desktop
PlatformsWindows, macOS, Linux
SupportDocs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
PricingFree plan
Websiteplydb.com
Facts checked20 Sep 2026

Alternatives to PlyDB

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Featured on iTechGuides

Featured on iTechGuides — PlyDB 7.1/10

PlyDB is listed in our Data Federation Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

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