Rest Hippo
REST API client
A free, offline alternative to Postman and Insomnia. Collections are plain files on your disk, HTTP runs outside the browser so nothing is subject to CORS, and there is no account to make.
A small family of free, open-source tools that run on your machine and keep to themselves. No accounts, no telemetry, no cloud waiting to be configured — just software that works when the wifi doesn't.
macOS · Windows · Linux · iOS & Android soon · Free & open source
The herd
Each one solves a problem its author had, properly rather than broadly. They share a look, a licence, and a refusal to talk to anything you didn't ask them to.
REST API client
A free, offline alternative to Postman and Insomnia. Collections are plain files on your disk, HTTP runs outside the browser so nothing is subject to CORS, and there is no account to make.
TTL breadboard simulator
A desktop playground for 74xx TTL logic. Drop chips on an infinite breadboard, wire them up, hit Run — and watch electricity ripple through every net until the circuit settles.
On-demand SSH tunnels
Bind a local port and the SSH tunnel opens the moment something touches it — through a chain of jump hosts if you need one — then tears itself down once the port goes idle.
Vault-compatible secrets manager
A from-scratch secrets manager that speaks HashiCorp Vault's HTTP API, so the Vault clients you already have keep working. Server, CLI and web console in one Go binary.
ML runtime, from scratch
Tensors, autodiff, neural networks and an inference server — written in pure Go against the standard library. No framework, no GPU, no cgo, and no hosted model behind any of it.
Shake-to-roll dice tray
The herd's first mobile app. Set your dice up once, and after that the phone is the tray — hold it upright, shake it, set it down, read the result.
In common
Different problems, same principles — and they are not marketing lines, they are constraints the code is written under.
Every hippo does its whole job with the network unplugged. Anything that does reach out — an SSH tunnel, an HTTP request — reaches where you pointed it and nowhere else.
Nothing to sign into, nothing phoning home, no analytics, no crash beacon, no update ping. There is no server to hold your data because there is no server.
Files in directories you can see, back up, and read without the app that made them. Nothing is locked in a proprietary store you have to export from.
Apache 2.0 across the herd, MPL 2.0 for Keep Hippo. Every line is on GitHub — read it, fork it, build it yourself if you'd rather not trust a binary.
macOS, Windows and Linux, on Intel and on ARM, built from the same source with the same features. No platform is the afterthought.
Each hippo ships a real user guide written alongside it, hosted and in-repo from one source, so the two cannot disagree.