Demo Automation
Demos and screenshots that keep themselves up to date — why product media rots, and how CI can re-render it from a spec when the product changes.
Automated product demo videos: regenerate, don't re-record
Four unrelated machines ship under one label. Only one makes 'the product changed' and 'the demo is current' the same event.
Keeping App Store screenshots current with automation
Localize into 50 languages and App Store screenshots become hundreds of PNGs. The fastlane pipeline that regenerates them, and when a browser wins.
Automating product screenshots for docs and marketing
The complete stills playbook: one YAML for every screenshot, a pull request that recaptures them on a schedule, and a visual regression test you get for free.
Demo environments and seed data that make a demo reproducible
You pinned the browser and the encoder. Then the same click lands on a different dashboard, because the database reseeded. The state has to be pinned too.
Rendering demo videos in CI: a GitHub Actions walkthrough
GitHub's runner ships Chrome but not ffmpeg. Here is what a video-rendering job actually needs, how to trigger it, and where the file should land.
Detecting UI drift before your demo lies about the product
A raw pixel diff fires on every font tweak; a bare selector check misses a button that moved. Here is the ladder in between, rung by rung.
Docs that test themselves: executable documentation
Python's docs literally call it 'executable documentation': an example that fails when the code drifts. The same trick works one layer up, on your screenshots.
Nightly demo builds: re-render the demo while you sleep
Compilers rebuild themselves overnight so breakage lands in a log, not a release. Point the habit at your demo and it quits quietly lying about the product.
README GIFs that update themselves
A 20-second demo GIF can weigh 18 MB, past GitHub's 10 MB ceiling. The format rules, the real size math, and a recapture loop that keeps it honest.
Generating demo data that looks real (and stays safe)
Lorem ipsum makes a demo look like a toy; a copy of production makes it a data-protection incident. The safe middle is seeded, coherent, synthetic data.
Release-notes videos generated per release
A monthly recap is a chore that slips; a per-tag video is a release artifact. Which releases clear the bar reads straight off the version number.
Versioned demos: one demo per product release
A nightly build keeps one demo current. Versioning does the opposite job: it lets v2.3's demo stay v2.3's forever, so nobody sees a feature they don't have.
Visual regression testing for marketing assets, not just components
Your Storybook is under test; your pricing page is not. Which marketing assets to baseline, how many snapshots each really is, and the noise to mute.
Visual regression testing tools compared by diff engine
Ten tools, three diff engines, one question the listicles skip: where do your baselines live? Cleave the category by mechanism and the field collapses to three.
Why every product demo is out of date (and what rot costs)
Linear redrew every header, icon, and nav in one release, and every demo filmed before that day went wrong in every frame. This is how fast demos rot.