This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
Tessera
Load a URL and see it on phones/tablets/desktops in canvas
See your web app on phones, tablets, and desktops at once — live, synced viewports at true size and DPR. Capture evidence, share mosaics, or run tessera check for agent-friendly overflow findings.
I got tired of resizing DevTools over and over and still missing a breakpoint, so I made Tessera.
It's a web app where you drop your URL onto an infinite canvas and each tile is an actual browser session at real device dimensions. Phone next to tablet next to desktop, all live. You can click around inside them. There's a sync mode so scrolling one scrolls the others.
Live tiles run on Playwright over a websocket. There's also a plain iframe mode if you don't need the heavy stuff.
The synced viewports are genuinely useful for spotting layout breaks side by side, and I love that the mosaic export idea feels practical for handing off screenshots to teammates without juggling three tabs.
Finally something that shows me the same page on a phone, a tablet, and my ultrawide at once without me dragging windows around. The mosaic capture is a nice touch for handoff to QA.
the synced viewports at true DPR is such a thoughtful detail, basically exactly what you'd want when checking responsive layouts across devices
The synced scroll across viewports feels so natural to use, like having three devices on my desk without the cable mess. Love that you baked in overflow detection for agents too, that's a really thoughtful addition.
Love how the viewports actually sync live instead of just rendering static snapshots, makes spotting responsive issues feel instant and honest.
About Tessera on Product Hunt
“Load a URL and see it on phones/tablets/desktops in canvas”
Tessera was submitted on Product Hunt and earned 0 upvotes and 7 comments, placing #149 on the daily leaderboard. See your web app on phones, tablets, and desktops at once — live, synced viewports at true size and DPR. Capture evidence, share mosaics, or run tessera check for agent-friendly overflow findings.
Tessera was featured in Design Tools (261.4k followers), Developer Tools (516.3k followers) and Tech (628.5k followers) on Product Hunt. Together, these topics include over 283.7k products, making this a competitive space to launch in.
Who hunted Tessera?
Tessera was hunted by MILL3R. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Tessera stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
MILL3R