Stop chasing RSVPs on WhatsApp. berthr handles invitations, crew coordination, guest questions, sail tracking, and your captain's logbook — so you can focus on sailing.
Running a boat shouldn't mean running a group chat.
berthr handles the operational side of sailing — invitations, RSVPs, guest questions, and crew coordination — plus live sail tracking and a captain's logbook you'll actually keep.
Invites & RSVPs, handled
Create a trip, add your guests, and berthr sends SMS invitations automatically. Guests reply YES or NO by text — no app, no account, nothing to install. You see who's confirmed in real time. Send a provisions list so everyone knows who's bringing what.
Crew Coordination
Post an open sail or send a crew request and let your crew self-select. First to reply YES gets the spot. Perfect for race days when you need bodies fast — crew see open slots on their profile page and claim them directly. No group chat required.
Your boat, with a brain
An AI assistant trained on your boat answers guest questions 24/7 — marina directions, what to bring, seasickness tips, overnight packing. Configure it once, it handles the rest. Guests ask by SMS or web chat.
Guest Directory
Your full roster with dietary restrictions, motion sickness flags, emergency contacts, and experience level. Everything you need at the dock.
Live Sail Tracking
Hit record when you leave the dock. berthr captures your track, speed, and heel angle all the way home, pulls in the day's weather, and drops it all straight into the logbook — replay the route on a map, check your heel chart, see your top speed and the conditions you sailed in. When the trip wraps, your guests automatically get a recap with the track and photos, and you can share a story-ready card to Instagram or the group chat.
Your Boat's Own Instruments
Connect to your NMEA 2000 network through a Wi-Fi gateway and berthr reads the real numbers — true wind speed and direction, boat speed through the water, depth, and heel measured by your own sensors. Live on screen while you sail, logged onto every point of your track, and summed up in the sail's stats. Your guests' recap quotes the wind you actually sailed in, not a forecast. No gateway? Everything else works exactly as it always has.
Works Without a Signal
Your guest list comes with you. The manifest for your upcoming sails lives on your phone, so allergies, emergency contacts and who's actually confirmed are there at the dock whether you have coverage or not. Sails save the moment you stop recording and upload themselves once you're back in range. Boat Wi-Fi with no internet, no coverage out on the water, roaming switched off — it makes no difference. The logbook shows you what's still waiting to upload.
Captain's Logbook
Voyages with multi-leg support, engine hours tracked as a running meter, and boat events — fuel, maintenance, haul-outs, winterization. Weather auto-filled from historical data for every sail.
Trip Photos
Every trip gets a gallery. Guests upload from their phones, you keep the best ones. Organized by trip, no shared albums to manage.
berthr runs the guest list, the crew, and the log — not the navigation. It reads your instruments; it doesn't replace your chartplotter.
berthr requires a berthr account. Get started for free at berthr.app.
Ratings & Reviews
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iPhone Duo Layout Enhancements + Recorder view enhancements on all models v3.6
Previous v3 changes - INSTRUMENTS, OFFLINE, BRING GUEST, LEADERBOARDS & STATS
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YOUR BOAT'S INSTRUMENTS, IN YOUR LOGBOOK
If your boat has an NMEA 2000 network and a Wi-Fi gateway, berthr now reads it. True wind speed and direction, boat speed through the water, depth, and heel measured by your own sensors — live on screen while you record, logged onto every point of your track, and summed up in the sail's stats.
The recap your guests receive now quotes the wind you actually sailed in, rather than a forecast.
Set it up in Settings > Boat > Instruments, and test the connection at the dock.
BUILT FOR A BOAT WITH NO INTERNET
Your guest list comes with you. berthr keeps the manifest for your upcoming sails on your phone — names, numbers, allergies, emergency contacts — so it's there at the dock whether you have coverage or not, and it tells you when you're looking at a saved copy.
Recordings save the instant you stop and upload on their own once you're back in range. A sail can't be lost to boat Wi-Fi with no internet, or to no coverage at all, and the Logbook shows exactly what's still waiting.
TIME ABOARD AND WHO'S PUT IN THE MOST
Your guest book now counts what each person has actually done aboard — sails, days, hours underway and nautical miles — and ranks your crew for this season, last season, or all time.
Tap anyone to hand them their sailing record: the document a sailing school or charter company asks for, night hours included, sent from your phone at the dock.
ALSO IN THIS VERSION
- A reminder to start recording when a sail is due to depart
- More accurate heel if your phone gets knocked off its mount
- Editing a confirmed sail now asks before it texts your guests
- Trip screens open straight away, even on a dead connection
- Various performance and bug fixes
V3.1 - more fixes and Leaderboard
v3.2 - Stats Page and more fixes.
v3.3 - Minimize your recording and lock screen/live events. iPhone Duo preparation & iPad UX enhancements. Allow Guest to bring guests. Multi-instance support (view your logbook and record a sail side by side). Other UX Enhancements and bug fixes.
v3.4 - Bug fixes and Free tier email included.
v3.5 - iPhone Duo Support.
v3.6 - iPhone Duo and iPad UX improvements. Changes to the Sail track layout across all devices. Maintenance type refinement and expansion.
Version 3.6
The developer, Mark Segal, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Contact Info
User Content
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Mark Segal
Size
7.2 MB
Category
Productivity
Compatibility
Requires iOS 18.0 or later.
iPhone Requires iOS 18.0 or later.
iPad Requires iPadOS 18.0 or later.
Mac Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
Apple Vision Requires visionOS 2.0 or later.
Location
This app may use your location even when it isn’t open, which can decrease device battery life.