Developers Kit is a native macOS workspace with local-first utilities — password vault, database client, ENV manager, clipboard history, JWT inspector, and more. Everything runs on your Mac. Your data never leaves it.
Every utility in Developers Kit does its work on-device. JWTs decode locally. JSON formats locally. Passwords are sealed with AES-256-GCM into a file that never syncs anywhere. The only time Developers Kit touches the network is when you connect to your own database — and even then, a six-level safe mode stands between you and a bad UPDATE.
The essentials
Eight focused utilities in one native app — everything local, everything fast.
A clipboard history manager for Mac that captures every copy locally — ⌃⌘V opens a search palette over any app, and OCR makes even screenshots findable.
An offline password manager for macOS — AES-256-GCM vault, Touch ID unlock, TOTP codes, and breach checks where only five characters of a hash ever leave the device.
Store environment variables securely on your Mac — every value lives in the macOS Keychain and reveals only after Touch ID, every single time.
A database client for Mac with SSH tunnels for Postgres, MySQL, SQLite, Redis, MongoDB, and DynamoDB — six-level safe mode gates every statement before it runs.
Find the process using any port on your Mac — a live list of every listener with its process and PID, refreshed every two seconds.
An offline JSON formatter for Mac — format, minify, validate, sort keys, and walk the tree without your payloads ever touching the internet.
A diff tool for Mac that works offline — split and unified views with word-level highlights, no character limits, no upload.
An offline JWT decoder with a difference — header, payload, and a claims table, plus real HS256 signature verification against your secret.
Native SwiftUI — not another Electron wrapper
Free download. No subscription, no account, no analytics.
Privacy
Developers Kit is sandboxed, notarized, and built for the Mac App Store. There is no telemetry to opt out of, because there is no telemetry.
network_audit --app "Developers Kit"[OK]
scanning outbound connections...0
analytics SDKs found...0
telemetry endpoints...0
No outbound traffic detected
Zero Telemetry
0 analytics SDKs, 0 tracking pixels, 0 crash reporters. Your usage is nobody's data.
jwt_secret_
AES-256-GCM / macOS Keychain
100% On-Device Crypto
Secrets live in the macOS Keychain, sealed with AES-256-GCM. Reveal requires Touch ID.
0 Accounts Required
No sign-up, no login, no cloud sync. Open the app and start working.
One Kind of Network Call
The only connections it ever makes are the ones you ask for — to your own databases.
Pricing
Developers Kit becomes a paid app in a future release. Download it while it’s free and it stays yours — App Store purchases never expire.
Two things only, both yours to trigger: connections to your own databases, and the optional password breach check, which sends five characters of a SHA-1 hash (k-anonymity) to Have I Been Pwned. Everything else is on-device.
Yes — CSV import understands all three formats. Export is CSV too, gated behind Touch ID.
PostgreSQL, CockroachDB, MySQL, MariaDB, SQLite, Redis, MongoDB, and DynamoDB — with SSH tunneling for the ones behind a bastion.
No. It's free on the Mac App Store for early birds — it will become a paid app later, but download it now and it's yours forever. Never a subscription or account.
macOS 26 or later. Touch ID is used where available; a Mac without it falls back to your password.