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A5:SQL Mk-2

Free#30 of 34 in Database Design ToolsDatabase Client Software

A5:SQL Mk-2: A Windows desktop tool pairing SQL work and data editing with ER diagrams. Ranked #30 of 34 in Database Design Tools by our editors (6.4/10); pricing: Free plan; best for windows users combining ER diagrams with SQL editing.

6.4/10Editor score

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A5:SQL Mk-26.4 Visit A5:SQL Mk-2

At a glance

Editor score
6.4 / 10
Pricing
Free plan
Best for
Windows users combining ER diagrams with SQL editing
Free plan
Yes
Paid from
Free
Facts checked
23 Sep 2026

Where it wins
- Works with a broad range of ODBC- or OLE DB-compatible databases
- Combines query design, SQL execution, and table data editing
- Creates ER diagrams and reverse-generates them from existing databases
Where it doesn't
- Windows desktop deployment limits platform fit
- Its stated diagram feature set centers on creation and reverse generation
- AI assistance depends on external AI service APIs

Our verdict on A5:SQL Mk-2

A5:SQL Mk-2 is a free Windows desktop SQL development tool and ER diagram editor for database developers who want query work, table data editing, and diagramming in one application. It connects to Oracle, Microsoft SQL Server, IBM DB2, PostgreSQL, MySQL, InterBase/Firebird, SQLite, and Microsoft Access, with additional connectivity for OLE DB- or ODBC-compatible databases. Its scope also fits solo, small, and mid-market teams that prefer a desktop application over a cloud service.

The database workflow covers SQL editing with table- and column-name completion, a GUI query designer for SELECT statements, and execution-plan display for supported engines. Users can view and edit table data, import and export table data in formats including CSV, XML, INSERT statements, and Excel, and configure SQL execution history. SSH tunneling is available for supported direct database connections. ER diagrams can be created or reverse-generated from existing databases, making the tool useful for inspecting schemas as well as working with queries. The published feature set emphasizes those tasks; it does not establish the forward-engineering depth or broader modeling capabilities that teams may seek in a dedicated database modeling tool.

A5:SQL Mk-2 is freeware, with no paid tier described. Its AI assistant uses external AI service APIs, so AI support is tied to those services rather than being a self-contained capability. The main tradeoff is platform and modeling scope: it is Windows-only, and diagramming is paired with SQL development rather than presented as an expansive standalone design environment. Choose it for free desktop SQL work across varied database connections, especially when editing data and reverse-generating diagrams are useful together. Look elsewhere if you need a non-Windows application or a dedicated modeling tool with broader design workflows.

Your product? Our editors can test A5:SQL Mk-2 in depth and publish a review, labelled as paid · from $149/mo →

A5:SQL Mk-2 pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on a5m2.mmatsubara.com

A5:SQL Mk-2 fact sheet

Free plan	Yes
Paid from	Free
Reverse engineering	Not verified
Forward engineering	Not verified
SQL export	Not verified
Supported databases	Not verified
Team collaboration	Not verified
Version history	Not verified
Deployment	Desktop
Deployment	Desktop
Platforms	Windows
Built for	Solo, Small business, Mid-market (editorial estimate)
Pricing	Free plan
Website	a5m2.mmatsubara.com
Facts checked	23 Sep 2026

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Also Ranked In

A5:SQL Mk-2 is ranked in 2 of our directories.

#29Database Client Software53 tools ranked

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Featured on iTechGuides

A5:SQL Mk-2 is listed in our Database Design Tools 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

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Last updated 7 Oct 2026 · How we research and update