Can AI build a trip planner app like Wanderlog?

Build a personal trip planner web app to replace Wanderlog Pro for my own use.

Tech rules:
- Plain HTML, CSS, and vanilla JavaScript in one file, plus a small service-worker.js file so the app opens offline after the first visit. No framework, build step, account, or server.
- Store all data in localStorage under one key, with a version number.

Data model:
- Trip: id, name, startDate, endDate, destinations [], currency, notes.
- Stop: id, tripId, date, time (optional, local to the stop), title, address, category (sight | food | stay | transport | other), notes, done.
- Booking: id, tripId, type (flight | stay | train | car | other), title, confirmation, startDateTime, startTimezone, endDateTime, endTimezone, address, notes.
- PackingItem: id, tripId, text, packed. BudgetItem: id, tripId, label, amount, category.

Features:
- Trip list with upcoming trips first.
- Trip view with tabs: Days, Bookings, Packing, Budget.
- Days tab shows every date in the trip, with drag-to-reorder stops inside a day and move-to-another-day.
- Each stop and booking with an address has a "Open in Maps" link built as a Google Maps search URL from the address. No map API key.
- "Today" button jumps to the current day during a trip.
- Duplicate a trip to reuse a packing list.

Edge cases the build must handle correctly:
1. Store times as the local time at that place, with its timezone. Never convert them to my phone's timezone.
2. A flight that lands the next day, or the day before after crossing the date line, shows the correct arrival date.
3. Changing trip dates to fewer days asks where to move stops from removed days.
4. Stops without a time sort after timed stops, in manual order.
5. The app opens and shows all trips in airplane mode after one online visit.
6. Budget totals don't add different currencies together.
7. Very long notes (booking emails pasted in) don't break the layout.

Backup:
- One-click "Export JSON" (all trips) and "Export trip as text" (a readable itinerary for email or print).
- "Import JSON" restores a backup after confirmation.
- "Print" view formats one trip as a clean day-by-day itinerary.

Layout:
- Mobile-first, one-handed use at 375px wide, high contrast for bright sunlight.

Exclusions:
- No publishing, App Store submission, accounts, payments, booking integrations, AI suggestions, collaboration, or social features.

Write a short README explaining where data is stored, how to export and restore it, and how to host the app so it works offline on my phone.

Keep it under 1,000 lines. This is a personal tool, not a product.

What is the short answer?

Yes. AI can build a trip planner that replaces Wanderlog Pro at $39.99 per year for your own travel. A day-by-day itinerary with bookings, map links, a packing list, and a budget takes 3–4 hours to build.

The interesting part: offline access is a Pro feature in Wanderlog, and it’s the easiest thing to get for free in a local web app. Your data already lives on your phone. The one step AI can’t do for you is hosting the file so your phone caches it for airplane mode.

Option	Best for	Upfront cost	Ongoing cost	Main limitation
Build a rough prototype	Travelers who plan 1–2 trips a year and want everything in one place	$0 and 3–4 hours	$0	Offline loading and timezone handling untested
Build a daily-use personal version	Frequent travelers who want offline itineraries and bookings without a subscription	$0–$20 and 8–12 hours	$0	No AI suggestions, route optimization, or booking imports
Keep paying for Wanderlog Pro	Groups planning together who want AI help, Gmail booking import, and route optimization	$0	$39.99/yr	Annual cost for offline access and exports

The ready-to-paste starter prompt at the end of this page builds the daily-use version.

What should the first version include?

The first version needs to answer one question on the road: where am I going next, and what’s the booking number? Everything else supports that.

• Trips with dates and destinations
• A day-by-day itinerary with times and notes
• Bookings with confirmation numbers
• A map link for every stop
• A packing list and a simple trip budget
• Offline loading after the first visit
• Deliberate exclusion: no AI suggestions, no place database, no collaboration. You research places yourself and paste them in.

What can AI build reliably?

ChatGPT and Claude build this app well because it’s lists inside lists: trips contain days, days contain stops. Drag-to-reorder, tabs, and forms work on the first try.

Concrete things AI gets right:

• A trip view that lists every date, including empty days
• Booking cards that show confirmation numbers in large text for check-in desks
• Google Maps search links built from an address, which open the Maps app on your phone with no API key
• A print view that turns a trip into a clean itinerary
• A service worker that caches the app for offline use

Where will AI need human help?

Offline loading needs your setup. A service worker only works when the app is served from a real web address over HTTPS, not opened as a file. Put it on a free static host, open it once on your phone, then test it in airplane mode before you fly.

Timezones are the classic bug. A flight leaving Lisbon at 22:00 and landing in New York at 00:40 needs both times shown in their local zones. AI often converts everything to your phone’s timezone, which makes your itinerary wrong the moment you land. Test one overnight flight and one flight across the date line.

Other decisions:

• An interactive map needs a library like Leaflet and a tile provider with usage rules [VERIFY terms]. Map links are simpler and free.
• Paste booking emails into notes rather than asking AI to parse them. Parsing works on 3 emails and fails on the 4th airline.

Privacy is strong. Passport-adjacent details like booking numbers stay in your browser. Don’t paste passport numbers or card details into notes.

Can I get my data out of Wanderlog?

Only partly. Wanderlog lists export to Google Maps and PDF export as Pro features, and comparisons show PDF export and offline access behind Pro. Free-plan users have no bulk file export for trips [VERIFY].

The practical path: move only your next trip. Copy stops and bookings into the new app by hand, which takes 20–30 minutes for a week-long trip. Past trips rarely need to move. If you want a record of them, export PDFs during one month of Pro before cancelling, or screenshot the itineraries.

There’s no importer in the starter prompt because there’s no standard file to import. That’s the real lock-in with trip planners.

How long will it take and what will it cost?

Rough prototype: 3–4 hours and $0. Trips, days, stops, bookings, and map links.

Dependable daily-use version: 8–12 hours, including offline loading, timezone-safe bookings, packing lists, budget, and print view. $0–$20 for one optional AI month.

Wanderlog Pro costs $39.99 per year. A $20 AI month equals about 6 months of Pro. On a free AI plan, you break even on the first trip.

These are estimates from reviewing the feature set, not measurements from a completed build.

Which AI tool or approach should I use?

Claude previews the app in the chat, so you can click through a sample trip right away.

ChatGPT is equally good for the build and helpful for walking you through hosting on a free static host.

Cursor is useful once you add the service worker, because you’re managing 2 files.

Lovable can host it for you in a few clicks, but tends to add accounts and a database. For a private itinerary, skip those.

What will I need to maintain?

Almost nothing. The app is 2 files on a free static host.

Recurring work:

• Export a JSON backup before each trip and after you return
• Open the app online once before departure so the latest version is cached
• If you clear Safari or Chrome data, restore from your backup

The app only lives in one browser on one phone. If you also plan on a laptop, export JSON from one and import it on the other.

Should I build it, buy it, or reduce scope?

Build it if you travel several times a year, plan solo or as a couple, and want offline itineraries without an annual fee.

Buy it if you plan trips with a group who edit together, or you rely on AI suggestions, Gmail booking imports, and route optimization. Those are the features worth $39.99.

Reduce scope if you take one trip a year. Build only Days and Bookings, skip packing and budget, and use the print view as your offline copy.

Recommendation: build it if you travel solo or as a couple. The offline access you’d pay Pro for comes free with the build. Keep Wanderlog if group planning is the point. For trip spending, track totals inside your YNAB-style budget, and log the trip itself in a Day One-style journal.

What if I wanted to ship this to other people?

Shipping this means accounts, real-time collaboration, a place database, map API bills, and booking-email parsing across hundreds of formats. That’s a startup, not a bigger version of the personal build. If you want to share a finished trip publicly, a simple page like the personal-brand website build is the lighter route.

Starter build specification

• User: You, for your own use.
• Problem: Paying $39.99 per year for Wanderlog Pro mainly for offline itineraries and exports.
• Core workflow: Plan days and bookings at home, then open the app in airplane mode and find the next stop and its confirmation number.
• Required features: Trips, days, stops, bookings with timezones, map links, packing list, budget, print view, offline loading.
• Deliberate exclusions: No accounts, no collaboration, no AI suggestions, no store submission.
• Data ownership: Stored in localStorage on your phone. Exported as JSON and as readable text. Restored from JSON.
• Definition of done: In airplane mode, the app opens and shows your next day’s stops. An overnight flight displays departure and arrival in their local times, on the correct dates.

For scoping help, read can AI build an app for me.

Sources and verification

• Wanderlog on the App Store (US): Pro annual price of $39.99, other listed plans, and Pro-only exports [VERIFY on Wanderlog’s site].
• Pilot vs. Wanderlog comparison (Pilot): offline access and PDF export on Pro.
• Wanderlog alternative 2026 (MonkeyTravel): free plan features and Pro contents.

This app was not built and tested for this page. The verdict is based on Wanderlog’s store listing, third-party comparisons, and a review of the feature set. Wanderlog’s price was checked on September 24, 2026.

Reviewed on September 24, 2026.