PostgreSQL Schema Diff.
Generate migrations.
Zero setup.

SERIAL & Identity Columns

Correctly detects SERIAL, BIGSERIAL, and GENERATED ALWAYS AS IDENTITY changes across schema versions.

Enum Types

Diffs CREATE TYPE ... AS ENUM statements. Catches added or removed enum values before they break your app.

Constraints & Indexes

Primary keys, unique constraints, foreign keys, CHECK constraints, and partial indexes — all compared semantically, not by raw text.

Quoted Identifiers

Handles double-quoted identifiers ("User") and mixed-case table names exactly like PostgreSQL does.

Array & JSONB Columns

Recognizes INTEGER[], TEXT[], JSONB, and warns when these advanced types appear so nothing slips through.

Privacy First

Your schema never leaves the browser. Compare production schemas safely without uploading sensitive table structures to a third-party server.

Column type change

ALTER TABLE "users"
  ALTER COLUMN "bio" TYPE VARCHAR(500);

Add a new column

ALTER TABLE "orders"
  ADD COLUMN "shipped_at" TIMESTAMP;

Add a foreign key

ALTER TABLE "comments"
  ADD CONSTRAINT "fk_comments_post"
  FOREIGN KEY ("post_id") REFERENCES "posts"("id");

Set a default value

ALTER TABLE "tasks"
  ALTER COLUMN "status" SET DEFAULT 'pending';