ICS Viewer is part of DevStudio — a free, in-browser collection of developer utilities that work without sign-up, installation, or any backend service. Drop or paste an RFC 5545 iCalendar file and view its event grid — summary, start/end, TZ and location, all running entirely on your device. Because the page never uploads what you paste, you can run sensitive payloads, configuration files, secrets, or production data through it with confidence: nothing leaves your browser tab. Use ICS Viewer for ad-hoc debugging, code review, log triage, release prep, learning a new format, or as a quick scratchpad while you build. If you use this tool a lot, pair it with File Viewer, CSV Analyzer, .env Parser, and the rest of the DevStudio toolkit for related developer workflows.