Developer tools that don't phone home.
Umbra bundles the small tools you reach for constantly — JSON formatting, Base64, hashing, JWT decoding, cron, and more — into one desktop app that makes zero network calls except one, explicitly disclosed: the automatic check for app updates. Installing an update always requires your explicit confirmation first — nothing installs silently. There is no telemetry anywhere in the app.
Download for Mac (Apple Silicon)Seven tools, one app
JSON
Format, minify, and validate JSON — then browse it as a collapsible tree, even at 10MB.
Base64
Encode and decode text or whole files to and from Base64, locally.
UUID
Generate UUIDs on demand, no network round-trip required.
Hash
Hash text or files (SHA-256, SHA-512, SHA-1, MD5) and get a checksum instantly.
JWT
Decode a JWT and read its header and payload — offline, so the token never leaves your machine.
Cron
Translate a cron expression into plain English, or type a schedule and get the expression back.
Bucket
Drop in an image or paste a screenshot, get its text back out, via on-device OCR.
See the privacy promise for yourself
Read exactly what Umbra sends over the network, and how that's verified before every release, on the FAQ.
Download for Mac (Apple Silicon)