Observed arrival · 2026-09-24
Calcomera’s browser-based device and connection checks
A free, no-install browser suite for diagnosing internet connections, keyboards, mice, audio, cameras, screens, sensors, and more.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People troubleshooting internet and device problems
- Worth noticing
- The packet-loss check separates missing outbound messages, missing replies, and replies that arrive late.
Field notes
The catalog divides its 38 checks into five categories, including internet (8), mouse and keyboard (11), sound and camera (7), screen and sensor (7), and VPN (5). Individual descriptions specify what the browser observes: the scroll-wheel test records received events, while the CGNAT check compares the public IPv4 seen by the site with the router’s WAN address and notes what that comparison cannot prove.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue