What Adventure+ unlocks

The full list, in one place.

Trips up to 90 days instead of 21, unlimited saved trips instead of 5.
3 route candidates per plan instead of 1, so you can compare real options rather than one route.
No daily cap on route or day-view generations (a light hourly limit exists only to stop runaway scripts, not normal planning).
Four Tabi-Kun tips per day in the day view instead of two.
Seasonal routing and seasonal icons that time your trip to cherry blossom, koyo, snow festivals and fireworks when your dates overlap.
Up to 6 collaborators per trip instead of 3.
No ads.
A dedicated forwarding email address per trip, so hotel, train, ticket and restaurant confirmations get parsed into your booking list and cost estimate automatically.
The full Seasonal Forecaster city list (around 25 cities, not just the 10 marquee cities on free).
The printable PDF export, cover, day-by-day schedule, transport, attractions, your trip notes, a bookings appendix, and the cost estimate page, all in one document.

What’s free either way

The wizard, route and day-view generation itself, the JR Pass calculator, Destination Matcher, the Seasonal Forecaster’s core view, and email alerts for a phenomenon you’re tracking, are all available on a free account. Upgrading is about depth, longer trips, and features like the PDF export, not about unlocking the basics of planning.