Made for foldables like iPhone Duo

Your app, whole on the big screen.

Web apps built for phones look stranded or stretched on the Duo's wide screen, with buttons landing on the fold. Paste your address and see it laid out for the Duo. No rebuild, and we never touch your database.

Free preview. Works with PWAs and any public web app.
Example · unfolded
Your app on iPhone Duo today
TodayPhone layout stranded in the middle
Your app on iPhone Duo with Slanvi
With SlanviFull width, content kept off the fold

Three steps, no rebuild

Step 1Paste your address

We open your app as an iPhone Duo, unfolded in both directions.

Step 2Approve the new layout

See before and after for each screen. Ask for changes until it looks right.

Step 3Add one line to your site

Every Duo visitor gets the new layout in their browser. Your backend and data stay exactly as they are.

<script src="https://slanvi.com/s.js" data-site="yourapp" defer></script>

Pick how you use Slanvi

FOR DUO OWNERSSlanvi BrowserFree

Phone-only sites reflow to the wide screen, content stays off the fold, and two tabs open side by side.

Coming soon to the App Store
FOR APP OWNERSSlanvi Studio$29 /mo per app

Your web app fixed for every visitor. $99/mo for larger apps with custom tweaks. Agency plans available.

Preview my app free
DONE FOR YOUSlanvi ShipFrom $1,500

We rebuild your app for the Duo's full screen, add push alerts, Touch ID sign-in and offline mode, and see it through Apple review.

hello@slanvi.com