A5:SQL Mk-2 review
A Windows desktop tool pairing SQL work and data editing with ER diagrams.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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.
A5:SQL Mk-2 pros and cons
- 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
A5:SQL Mk-2 fact sheet, pricing and score →
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