Tuntau · Developer tools

The relation-aware
database studio

Junction traces how your tables actually connect — pick a from and a to table and it maps every join route between them, then turns any route into runnable SQL. Fast, native, and fully offline.

Coming soon — Junction is in pre-release.

Built for people who live in the schema

Everything a database client should be, plus the relationship tooling nothing else has.

🕸

From → To routing

Pick two tables; Junction finds every join path between them (with an optional "via" filter) and builds the SQL for the route you choose.

🔧

Visual query builder

Assemble SELECT / JOIN / WHERE / ORDER visually — join suggestions come from real and inferred keys. Convert to SQL and back.

🔗

Codebase-inferred relations

No foreign keys? Point Junction at your repo (LoopBack, Laravel…) and it infers relations from the code — read-only, never touching your files.

🤖

AI assistant, your model

Bring any OpenAI-compatible endpoint — LM Studio and Ollama run offline. It inspects schema, drafts queries, and asks before any write.

📥

Import & export at scale

Stream multi-gigabyte .sql dumps in and out with real progress, keyset-paginated backups, and per-table CSV/JSON export.

🔒

Local & private

Native Rust drivers run in-app, so localhost means your machine. Secrets are encrypted on disk behind an OS-keychain master key.

Speaks every database

One studio, five engines — same relation tooling across all of them.

🐘 PostgreSQL
🐬 MySQL / MariaDB
📦 SQLite
🟦 SQL Server
🍃 MongoDB

Everything in the box

One studio, no add-ons. Here's the full list.

Explore

  • From→To route tracing with "via" filter
  • Force-directed relations graph
  • Highlight & focus by neighbourhood
  • AI schema categorization
  • Codebase-inferred relations (LoopBack, Laravel…)
  • AI relation detection for FK-less schemas

Query

  • Visual query builder
  • SQL editor with autocomplete
  • Build SQL from any route
  • Convert SQL ↔ visual builder
  • Cross-database queries
  • Saved queries & query history
  • EXPLAIN & cancel running queries

Work with data

  • Browse, filter, sort & paginate
  • Inline edit, insert & delete
  • Structured or raw filters
  • Import SQL files (streamed, any size)
  • SQL dump & restore with progress
  • Per-table CSV / JSON export

Engines

  • PostgreSQL
  • MySQL / MariaDB
  • SQLite
  • SQL Server
  • MongoDB
  • Native Rust drivers, no ODBC

AI assistant

  • Bring your own model (OpenAI-compatible)
  • LM Studio & Ollama run fully offline
  • Inspects schema & drafts queries
  • Reads your linked codebase (read-only)
  • Asks before every write

Trust & comfort

  • Fully offline — nothing phones home
  • Secrets encrypted, keychain-locked
  • Read-only connection guard
  • SSH tunnels & SSL/TLS
  • 18 themes, accents & animated backdrops
  • Light & dark, keyboard-first
  • Pinned & multi-tab workspace

Planned pricing

Buy it once — no subscription. These are the launch plans; nothing is for sale yet.

Free
€0forever
  • 2 connections
  • SQL editor + visual builder
  • Table browse & edit
  • Relations graph
Coming soon
Pro Popular
€59one-time · per seat
  • Unlimited connections
  • AI assistant (your own model)
  • Codebase relation inference
  • Cross-database queries
  • Unlimited saved queries
  • 1 year of updates
Notify me
Team
€39per seat · yearly
  • Everything in Pro
  • 5+ seats
  • Shared connection vaults (roadmap)
  • Priority support
  • Rolling updates
Contact us

Coming soon

Junction is in pre-release. Native builds for macOS, Windows and Linux land here at launch.