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Underbook vs Petrel Voyage

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Underbook compared with Petrel Voyage
Detail UnderbookPetrel Voyage logo Petrel Voyage
What it doesYour hotel, double-checked. You booked the trip. Petrel organizes it.
StageNot given Startup
FoundedNot given 2026
Based inNot given US
Pricing modelFree Not given
PricingNot given Free first trip (every feature, no credit card); Voyager $49/year (unlimited trips); One more trip $9.99 (one-time)
Key features
  • Compares prices across multiple booking sites for the same hotel and dates
  • Shows all-in prices including taxes and fees
  • Identifies whether a cheaper listing names the same room
  • Displays the going rate most booking sites agree on
  • Price-drop alerts for booked stays
  • Web price checker for phones and computers without install
  • Works on Booking.com, Expedia, Hotels.com, Agoda and hotel websites
  • No account required
  • Never sees payment information
  • Automatic itinerary building from booking confirmations in any format (emails, PDFs, screenshots, photos, spreadsheets)
  • Live flight status with gate, terminal, and delay updates
  • Offline access to complete trip
  • Free invite and collaboration for travel companions with edit access
  • Live calendar feed (ICS) with automatic updates
  • Encrypted document vault for passports, IDs, and contacts
  • Travel statistics tracking countries, continents, miles, and traveler tier
  • Business trip management with expense reports and receipt attachment
  • Trip recap with route, miles, and photos as travel blog
  • Travel time calculations between stops with map integration
What makes it different
  • Completely free with no account or hidden costs
  • Shows whether cheaper sites are legitimate alternatives or unfamiliar booking channels
  • Transparent about limitations and never pretends different rooms are the same
  • Email alerts only for significant price drops of 5% or more on refundable bookings
  • Reads any format of booking confirmation: emails, PDFs, screenshots, photos, even spreadsheets and paper vouchers
  • No account required for first trip, no credit card needed to start
  • Travel companions can view, edit, and split costs completely free
  • Modern alternative to TripIt with simpler interface and automatic parsing
  • Trips never deleted; permanently accessible, editable, and exportable
Community votes00
DR (Domain Rating by Ahrefs)1 +1 (up) since last check3 −1 (down) since last check
Trust Flow (Majestic)01
Citation Flow (Majestic)1926
Referring domains (Majestic)353

3 details filled in for both companies.

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