Schengen Stay Calculator

A free, web-based planner that helps travelers stay compliant with the Schengen 90/180-day rule. Users add past and planned trips, visualize them on an interactive six-month calendar, and instantly see days used, days remaining, violations, and the next safe entry date.

Key Features

Trip management and an interactive multi-month calendar
Status dashboard and violation alerts
Planning tools: “When can I stay X days?” and “How long can I stay from date Y?”
localStorage persistence and dark/light mode

Technical

Vanilla HTML/CSS/JS
Custom timezone-safe SchengenCalculationEngine using a sliding window algorithm for rolling 180-day calculations
Memoization for performance, robust input validation, and keyboard navigation

UX & Accessibility

Responsive layout
Colorblind-accessible palette and high-contrast support
Enhanced focus states

Privacy & Compliance

Data stays in-browser only
Google Consent Mode default-denied with on-site consent banner/CMP
Strict CSP and Privacy Policy page

SEO & Monetization

Structured data: Organization, SoftwareApplication, FAQ, HowTo
Open Graph/Twitter cards
robots.txt, sitemap.xml, ads.txt
AdSense auto ads gated behind consent

Role

Sole developer (design, frontend engineering, performance, accessibility, and SEO).