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Introduction

YoFix is a deployment preview and visual regression testing platform built for engineering teams that ship every day. It plugs into your existing GitHub workflow and gives every pull request three things:

  1. A unique, publicly reachable preview URL (e.g. your-branch.yofix.dev).
  2. A pixel-level screenshot diff against the production baseline.
  3. A single, in-place updating PR comment that summarizes both.

That’s the surface. The substance is what’s underneath: a reliability and safety model designed for production engineering teams.

What we promise

YoFix is built around three properties we refuse to compromise on.

Reliability

Every job in YoFix is idempotent. Retries do not double-build, do not double-post PR comments, and do not corrupt comparison baselines. Jobs are atomically claimed by workers, so concurrent deploy nodes cannot race. Health checks gate every deploy. SSIM + pixelmatch comparisons are deterministic for the same inputs.

Safety

Preview traffic lives on a different top-level domain (*.yofix.dev) than the dashboard and API (*.yofix.ai). This isolation means a preview cannot read or write your app’s session cookies even if both happened to live on the same browser. Per-org role-based access control gates every action. Every promote, rollback, role change, and configuration edit is logged with actor, IP, and timestamp.

Predictability

The same commit produces the same artifact, every time. Builds are pinned to your lockfile and cached aggressively, so a re-run finishes in seconds. Promote turns a verified preview into production with one click. Rollback is an atomic edge swap, under ten seconds, no rebuild.

Who YoFix is for

  • Frontend teams who can’t afford to ship a visual regression to production.
  • Platform teams who want a single tool that handles previews + VRT + promote + rollback rather than a stack of glue scripts.
  • Compliance-aware orgs who need RBAC, audit logs, isolated worker pools, and the option to keep artifacts in their own cloud bucket.
  • OSS maintainers who want a free, no-credit-card preview URL on every PR.

How it fits in your workflow

  1. Install the GitHub App on a repository.
  2. We auto-detect the framework, package manager, and Node version.
  3. Push commits, open PRs as normal.
  4. YoFix builds, deploys, screenshots, and comments on each PR.
  5. Approve the diff. Promote when ready. Roll back if needed.

You do not write a config file unless you want to override defaults.

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