You bought an ultrawide. Your videos didn't.
Those bars on the sides? That's what every standard player gives you on a widescreen monitor. Smoothie fills every pixel without touching faces — on YouTube, Twitch, even Netflix.
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Stretching is easy. Faces are hard.
Left: what other “fill the screen” extensions do — uniform stretch, every face ~31% wider. Right: Smoothie — the centre stays far closer to natural while the edges carry most of the stretch. Drag the divider.
Free on YouTube · 3-min free preview on every other site Get Pro for every site — Netflix included
But how does it work?Quintic smootherstep. Drag and see.
Every horizontal pixel is remapped by blending the identity line with Ken Perlin's quintic smootherstep — chosen because its second derivative vanishes at the endpoints, so the warp accelerates without a visible "seam" between centre and edge. At the default strength of 0.34, the curve delivers a 21:9 monitor's 1.31× overall horizontal fill while keeping the centre far closer to its natural width than the edges — so faces near the middle stay close to round.
f(x) = mix(x, 6x⁵ − 15x⁴ + 10x³, 0.34)
You had me at quintic
Free on YouTube. Pro everywhere.
Smoothie's free on YouTube — forever. On every other site you get a free 3-minute preview each time you switch it on: watch it fill your Netflix before you pay a cent. Pro removes the timer everywhere, auto-tuned for 21:9, 24:9 and 32:9.
Questions, answered.
What's the difference between Free and Pro?
Free gives you the full Smoothie warp on YouTube — forever — plus a 3-minute Smoothie preview on any other site, as many times as you like: watch it fill your own Netflix or Twitch before paying anything. Pro from $5/month (or $24/year, ≈ $2/mo) removes the timer everywhere. See pricing for the full comparison.
How does payment work?
Ultrawider Pro is a subscription: $5/month or $24/year (both auto-renew until you cancel), or a one-time $49 lifetime license that never renews. You pay by card or PayPal — Visa, Mastercard or PayPal — through Lava.top, our payment processor. Your Pro license key is emailed within 5–20 minutes. You can cancel anytime (see below). If something's genuinely broken on our end we'll make it right — see Support Policy.
How do I cancel?
Cancel anytime, self-serve, at ultrawider.net/cancel (or email hello@ultrawider.net). Cancelling stops the next renewal; you keep Pro until the paid period ends. The one-time Lifetime license has nothing to cancel — it never renews.
Which monitors are supported?
Any ultrawide: 21:9 (2560×1080, 3440×1440), 24:9 (3840×1600), 32:9 super-ultrawide (5120×1440), or anything wider than 16:9. The extension auto-detects your viewport aspect and tunes the curve depth so the warp stays in the sweet spot regardless of display.
Which sites does it work on?
Everywhere video plays in your browser — including Netflix, Prime Video, Disney+, Max, Hulu, Apple TV+ and Crunchyroll. Smoothie is built as an SVG displacement filter: it never reads a single pixel, so DRM has nothing to block. Sports too: DAZN, ESPN, F1 TV, live matches on any streaming site. Plus Twitch, Kick, Vimeo, news sites, course platforms — and every other HTML5 player.
What if Pro doesn't work for me?
We're indie and we care. If something's genuinely broken (key never arrived, double-charge, Pro doesn't work on supported sites and we can't fix it), email hello@ultrawider.net with your order ID — we'll either resolve the issue or issue a goodwill refund at our discretion. We don't refund "I changed my mind" requests, but we won't hold anyone hostage to something that's actually broken either. See our Support Policy for the full picture.
Does it work in all browsers?
Chrome 110+ and any Chromium-based browser of the same vintage (Brave, Opera, Vivaldi, Arc) via the Chrome Web Store, Microsoft Edge via Edge Add-ons, and Firefox via addons.mozilla.org. Safari is not supported; the live playground on this page works in any modern browser with WebGL2.
How is my payment processed?
Payments go through Lava.top's secure checkout, handling Visa, Mastercard and PayPal. After payment your license key arrives by email within 5–20 minutes. Paste it into the extension popup or fullscreen HUD to activate.