Neon Postgres Schema Diff.
Generate migrations.
Zero setup.

Paste two pg_dump --schema-only outputs from your Neon branches or projects. Spot every table, column, index, and constraint change instantly. Get ready-to-run ALTER TABLE scripts — all in your browser.

No account required. No data leaves your device.

Built for Neon Postgres workflows

SchemaLens understands PostgreSQL-specific syntax that generic diff tools miss — perfect for Neon serverless projects.

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Branch-to-Branch Diff

Compare schemas across Neon branches. Export from your main branch and a feature branch to see exactly what schema changes a PR introduces.

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Serverless-Optimized

Understands Neon-specific Postgres configurations. Detects connection-pooling schema changes, compute size hints, and autoscaling-related metadata.

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Enum & Custom Types

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

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Constraints & Indexes

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

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Functions & Triggers

Detects CREATE FUNCTION and CREATE TRIGGER changes. Essential for Neon projects that use database functions for data transformations.

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Privacy First

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

How it works

Export your Neon schemas

Run pg_dump --schema-only against your Neon connection string, or export from the Neon Console SQL Editor.

Paste into SchemaLens

Copy the SQL into the two editor panes. Dialect is automatically set to PostgreSQL (Neon's engine).

Review the diff

See added tables, dropped columns, type changes, and constraint modifications highlighted in color. Breaking changes flagged in red.

Copy the migration

Export ALTER TABLE scripts, save as Markdown, PDF, or raw SQL. Run against your target Neon branch or project.

Neon migration examples

SchemaLens generates production-ready ALTER TABLE scripts for every change it detects in your Neon Postgres project.

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");

Create index for performance

CREATE INDEX "idx_orders_user_id"
  ON "orders"("user_id");

Neon diff vs other tools

SchemaLens runs in your browser and works with any Neon project — no CLI setup required.

✅ SchemaLens

Browser-based — zero install
Works with any pg_dump or SQL export
Visual diff with color highlighting
Branch-to-branch comparison support
Shareable diff URLs
Export to SQL, Markdown, PDF, Prisma, Drizzle

❌ Neon CLI / psql

Requires CLI installation and connection string
Requires local Postgres tools
Text-only output
No visual branch comparison
No shareable links
SQL output only

Related guides

PostgreSQL