JezView loads one URL across real device viewports side by side — phones, tablets and desktops — so responsive problems show up before your clients see them.
Each viewport renders at the device's real CSS pixel width — media queries fire exactly as they do on the device, then scale to fit your screen.
The desktop app overrides user-agent, device pixel ratio, touch and screen metrics at the Chromium engine level — mobile themes, retina assets and touch layouts render exactly as on the device, not a squeezed window.
Capture every viewport in one click. The desktop app writes full-page PNGs per device — ready to drop into a ticket or client email.
Sites that refuse to be framed load anyway, and phones and tablets are served the page a real mobile browser would get.
iPhones, Pixels, Galaxies, iPads, laptops and desktops up to 4K — 2020 through 2026, portrait or landscape, as many side-by-side as you like.
Type once, every viewport navigates together. Refresh all with one click.
| Web app | Desktop app | |
|---|---|---|
| Install | None — runs here | AppImage / .exe |
| True device widths + media queries | Yes | Yes |
| Mobile user-agent to the server | Proxy mode | Always, per viewport |
| Device pixel ratio + touch emulation | — | Engine-level (CDP) |
| Sites that block framing | Proxy mode | No limits |
| Screenshots | Visible area (tab capture) | Full page, per device |