Privacy policy
Last updated November 9, 2026.
Rewind VM is made by Lunch Time Surf LLC, a California limited liability company based in Santa Cruz ("we"). This policy covers this website, the Rewind VM engine and command line, and the Rewind VM desktop app.
This website
This website uses Google Analytics to see how people find and use it, including whether a visit ends in a purchase. It sets cookies only where local law allows, and none of it is used for ads. The site is hosted on GitHub Pages and uses Google Fonts, and one case study embeds a YouTube video; these see the usual details of any web request.
Only the website does this. The engine, the command line and the desktop app send nothing to us.
They make requests only to servers you name, to the binary caches your Nix is configured
with and to cache.nixos.org. rewind nix runs Nix to fetch a build's inputs,
then asks those binary caches whether each holds the same output, logging in with your netrc
entry where a cache has one. rewind gdb, and the other commands and app panels
that show source code, download debug information and source files from cache.nixos.org,
from those binary caches and from any debuginfod servers you have set. With the NixOS
module, one of those caches is rewindvm.cachix.org, which we run on Cachix: debug
information for the guest kernel comes from there, and Cachix sees the usual details of the
request. rewind import and the app download a recording from a link you give
them.
Your runs stay on your machine
The engine, the command line and the desktop app run on your computer. Your workloads, the inputs they run on, their keyframes, forks and anything you export stay on your machine. We never receive them. They leave your machine only when you share them yourself, for example by attaching an exported run to an issue.
The desktop app works offline
The app does not phone home. There are no accounts, no telemetry and no crash reporting that sends data to us. License keys are checked on your machine, offline, so entering one sends nothing anywhere.
Buying a license
Payments are processed by Stripe. Stripe receives your email address, your billing details and your card to take the payment and send your receipt, under Stripe's privacy policy. We never see your card number.
From Stripe we receive your name and email address. We use them to email you your license key, to resend it if you lose it, to handle a refund, and to answer support requests. We do not add you to a mailing list and we do not sell or share your details.
If you email us, for support or anything else, we keep the conversation to reply to you. Nothing more is done with it.
What Rewind VM does not do
- No accounts.
- No analytics, telemetry or tracking in the engine, the command line or the app.
- No ads.
- No selling or sharing of your data.
Contact
Lunch Time Surf LLC, Santa Cruz, California. tacos@lunchtimesurf.com