Backwards-Sliding Window
Pursuant to Article 6 of Regulation (EU) 2016/399 (Schengen Borders Code), the algorithm inspects the retrospective 180-day block backward from every travel date to guarantee stays never exceed 90 days.
Independent Travel Engineering · Hertfordshire, UK
About Atlassio: Precision Schengen Intelligence & 3D Travel Tracking
Atlassio was built to solve a critical, modern mobility challenge: navigating the strict and unforgiving 90/180-day limitation of the Schengen Area without spreadsheets, human error, or algorithmic ambiguity.
90 / 180
Rolling-Window Engine
29 States
Full Member Coverage
100% Client
Zero Itinerary Telemetry
< 24h
Direct Founder Support
Why Atlassio Was Built
Atlassio was founded by Toby Daeche, a software engineer based in Hertfordshire, United Kingdom. Following the end of the post-Brexit transition period, millions of British passport holders joined non-EU citizens from the United States, Canada, Australia, and around the world in facing European border controls under the strict 90/180-day limitation.
Traditional planning methods consistently failed because static spreadsheets could not reliably model dynamic backwards-sliding 180-day reference frames. Atlassio was engineered to pair a strict mathematical calculation engine with an intuitive 3D WebGL globe, turning dry bureaucratic compliance into a clear, visual travel companion.
Entity: Toby Daeche, trading as Atlassio
Jurisdiction: Hertfordshire, United Kingdom
Support SLA: Responds within 24 hours
Mathematical Methodology & EU Regulatory Alignment
Arrival & Departure Rules
Both the day of entry and the day of exit count as full days spent inside Schengen. Inclusive boundary logic ensures no inadvertent overstay occurs.
EES & ETIAS Readiness
Digital calculation models designed to match the incoming European Entry/Exit System (EES) and European Travel Information and Authorisation System (ETIAS).
Statutory Disclaimer: Atlassio is an advanced informational calculation instrument and travel planning aid. Calculations depend strictly on dates provided by the user. Atlassio does not grant legal status or issue visas.
Schengen Knowledge Hub & Verification Directory
Core Calculation Engines & Travel Tools
Free Schengen 90/180-Day Calculator
Instant rolling-window compliance verification without creating an account.
3D Interactive World Globe & Trip Planner
Explore border geometries and model complex multi-leg European itineraries.
Real-Time Tracking Dashboard
Sync travel allowance across devices with offline-first IndexedDB resilience.
Schengen Member States — Country Rule Hubs (29 Nations)
Austria
AT
Belgium
BE
Bulgaria
BG
Croatia
HR
Czech Republic
CZ
Denmark
DK
Estonia
EE
Finland
FI
France
FR
Germany
DE
Greece
GR
Hungary
HU
Iceland
IS
Italy
IT
Latvia
LV
Liechtenstein
LI
Lithuania
LT
Luxembourg
LU
Malta
MT
Netherlands
NL
Norway
NO
Poland
PL
Portugal
PT
Romania
RO
Slovakia
SK
Slovenia
SI
Spain
ES
Sweden
SE
Switzerland
CH
Passport & Nationality Schengen Guides
United States Passport
Visa-Free (90/180)United Kingdom Passport
Visa-Free (90/180)Canada Passport
Visa-Free (90/180)Australia Passport
Visa-Free (90/180)New Zealand Passport
Visa-Free (90/180)Brazil Passport
Visa-Free (90/180)India Passport
Schengen Visa RequiredChina Passport
Schengen Visa RequiredNever Guess Your Schengen Days Again
Calculate your remaining allowance in seconds. Zero signup required for instant rolling-window checks, or launch the interactive travel tracker.