SchemaSmith vs SQL Compare

Free, source-available CLI for SQL Server, PostgreSQL, and MySQL — vs Redgate’s commercial GUI-first SQL-Server-only diff tool.

Chaos vs Precision: Product Comparisons

Quick Summary

Both tools use a state-based approach to schema deployment. SchemaSmith is a free, source-available CLI (SSCL v2.0) covering SQL Server, PostgreSQL, and MySQL, with reference-data deployment included via DataTongs. Redgate SQL Compare is a commercial Windows GUI (CLI available via Docker for Linux/macOS) for SQL Server only; data deployment requires the separately-licensed SQL Data Compare. Pricing for both Redgate tools is per-user with tiered bands — check the vendor site for current rates.

Technical Comparison

How the tools differ in approach, features, and developer experience.

Aspect SchemaSmith SQL Compare
Approach State-based, CLI-first State-based, GUI-first
Platform Coverage SQL Server, PostgreSQL, MySQL (platform-specific schema definitions) SQL Server & Azure SQL only
Deployment Surface Native CLI runs on Windows, macOS, Linux, ARM64 Windows GUI; CLI on Linux/macOS via Docker
Source Format JSON template files (one per table, view, procedure) in source control Source SQL files alongside Redgate’s project format
Reference Data Declarative DataDelivery blocks; two-pass FK-aware loader (DataTongs included) Not included — SQL Data Compare is a separate product
CI/CD Integration Native CLI is a single deployment step; idempotent SQL Compare CLI available; automation features bundled in higher tiers
Drift Detection Built-in — runs on every deployment On-demand comparison in the GUI or CLI
Failed Deployment Recovery Checkpoint & resume (--ResumeQuench); skips completed work on retry Re-run; partial-state cleanup is the deployer’s responsibility
Conditional Deployment ShouldApplyExpression — one file applies per database, env, or version Filter rules and project options
SQL Server Availability Groups Target:SecondaryServers — primary plus secondaries quenched in parallel Apply per server; orchestration is the deployer’s problem
Licensing Free under SSCL v2.0 (source-available); unlimited seats Commercial, per-user with tiered bands; 14-day trial

Production-resilience features, free

Checkpoint & resume, two-pass FK-aware data delivery, ShouldApplyExpression, secondary servers for SQL Server Availability Groups, and custom script folders all ship in the free CLI. SQL Compare focuses on the diff-and-apply step; the surrounding orchestration is a separate concern.

Choose SchemaSmith when...

  • You manage SQL Server, PostgreSQL, and MySQL — or expect to expand beyond SQL Server
  • You need declarative reference-data delivery bundled with schema deployment, not a separately-licensed tool
  • You want a self-contained CLI that runs natively on Windows, macOS, Linux, and ARM64
  • You prefer source-control-native JSON template files over a GUI-managed proprietary project format
  • You need built-in drift detection and idempotent CI/CD on every deployment
  • You need to resume a failed deployment without re-running everything that already succeeded
  • You want a license that does not change as the team or footprint grows — free, source-available, no per-seat fees

Choose SQL Compare when...

  • You are SQL Server / Azure SQL only with no plans to expand
  • You prefer a manual, visual diff-and-apply GUI experience
  • Your team works primarily inside SSMS / Visual Studio on Windows and the GUI fits the existing workflow
  • You have established Redgate workflows and want to keep them
  • Reference-data deployment is rare or already handled by a separate tool

Pricing & Licensing

How the two tools differ on cost, license terms, and what an apples-to-apples comparison includes.

Aspect SchemaSmith SQL Compare
License SSCL v2.0 (source-available) Commercial, proprietary
Cost $0/year — free for any purpose, any organization, any scale Per-user with tiered bands (1-4, 5-9, 10+); 14-day trial; check vendor for current rates
Schema Deployment Included in the free CLI Core SQL Compare product
Reference Data Deployment Included — DataDelivery + DataTongs ship in the same CLI Separate — SQL Data Compare is a distinct, separately-licensed product
CI/CD Automation Included — the CLI is the CI/CD step SQL Compare CLI available; deeper automation features bundled in higher Redgate tiers
Cost as You Scale Stays at $0/year regardless of team size or environment count Per-user license count grows with the team; data deployment adds a second per-user line item

Redgate publishes the current SQL Compare buying matrix at red-gate.com/products/sql-compare. Specific dollar figures are not publicly listed; contact Redgate for current rates.

What an apples-to-apples comparison includes

A like-for-like comparison covers schema deployment and reference-data deployment in CI/CD. SchemaSmith bundles both in the free CLI. With Redgate, schema and data are separate products, each licensed per user. As team size grows or reference-data tables get added to the workflow, the SchemaSmith side stays at $0; the Redgate side adds two per-user license axes.

Migrating from SQL Compare

Switching from SQL Compare to SchemaSmith is a one-way extraction. Run SchemaTongs once to capture current state as JSON, and that JSON becomes your new source of truth.

  1. Extract current state with SchemaTongs. Point it at a representative database and let it capture every table, view, procedure, and function as JSON template files.
  2. Review the generated metadata. The JSON files become the source of truth — commit them to source control alongside the rest of your repo, replacing the proprietary SQL Compare project.
  3. Deploy with SchemaQuench. Future schema changes are edits to the JSON; SchemaQuench generates and applies the DDL on every run, idempotently.

SchemaSmith’s JSON template files are portable and human-readable — no proprietary project format, no per-tool licensing as the team grows.

Pricing and feature data last verified May 2026. Competitor information may change.