{"name":"Tessera","title":"Tessera — Live multi-device viewport testing for web apps","tagline":"See your app on every screen, live.","definition":"Multi-device viewport lab — see a live web app across phone, tablet, and desktop viewports in one screen.","notAnAiTool":true,"url":"https://app.tesserae.site","github":"https://github.com/JAMl3/tessera","supportEmail":"support@tesserae.site","lastUpdated":"2026-09-27","version":"0.1.0","operatingSystem":"Web","applicationCategory":"DeveloperApplication","features":["Live multi-device viewports on one canvas","Sync scroll and follow-links across tiles","Proxy on by default so most sites embed","Read-only share links","Saved Mosaic layouts","Optional tessera check CLI for overflow findings","Optional tessera dev localhost tunnel (Pro)"],"limitations":["Free is two tiles, one Mosaic, and 7-day share links","Captures, Pin & Compare, and more than two tiles need Pro","Cloud localhost tunnels need Pro and tessera dev","Proxy is not a full browser identity spoof; some sites still need the Live engine","Default iframe tiles use exact CSS viewport W×H; iframe content sees the host browser’s devicePixelRatio. Device DPR is labelled and applied for Pro captures","Tessera does not generate designs, write code, or answer prompts"],"pricing":{"free":"£0 — two tiles, two concurrent live sessions, sync, arrange, one Mosaic, 7-day shares, tessera check on the responsive preset for public URLs","pro":"£12/month — unlimited tiles, 6 live sessions, captures, Pin & Compare, localhost tunnels, all agent presets, unlimited Mosaics, permanent shares"}}