Need a Travel Planning App With Destination-Based Packing Checklists

We are looking for a developer to build a mobile app that helps travelers prepare for trips from the first planning step through departure day. The core idea is simple: a user creates a new trip, enters the destination and travel dates, and the app automatically generates a packing checklist tailored to that location and season, accounting for expected weather and the type of trip such as a business visit, a beach holiday, a hiking trip, or a city break. The checklist should be editable, with the ability to add custom items, mark them as packed, and reuse a finished list as a template for future trips to similar destinations.

Beyond packing, the app needs to organize the trip itself. Each journey should have a day-by-day itinerary view where the traveler can add planned activities, transfers, and notes for every day, and see the whole trip laid out on a simple timeline instead of scattered notes. We also want a single place to store tickets, hotel confirmations, insurance, and visas, either by uploading files or forwarding confirmation emails, so nothing gets lost between booking and departure.

We need clean UX with reliable offline access, since travelers often need their checklist and documents without an internet connection. Push notifications should remind users about unpacked items close to departure. Please share your experience with similar apps, your proposed tech stack, and an estimate of the timeline and cost.

Key features:
— Checklist generator by destination and season
— Editable list with reusable templates
— Day-by-day itinerary with notes
— Storage for tickets and documents