Supported Features
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VoiceOver
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Larger Text
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
Bosun's Mate
Vessel log every captain wants
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Free forever — 1 vessel, unlimited entries, no card. Try Pro free for 7 days: charts, checklists, AI receipts and Season Summary.
Bosun's Mate is the vessel management system every mariner wishes they had.
Engine hours. Fuel logs. Parts catalogs. Receipts. Cruising notes. Everything that matters about your boat — captured beautifully, totalled automatically. Searchable. Cross-linked. Never lost.
WHY CAPTAINS LOVE IT
— Multi-engine support for twin and quad rigs. Track port, starboard, and beyond — each engine logged independently with its own service intervals, fuel economy, and hours.
— AI receipt OCR. Snap a photo of a parts receipt and Bosun's Mate reads every line item in 8 seconds. Vendor, OEM numbers, prices — extracted, organized, and added to your catalog. No more squinting at fading thermal paper.
— Multi-page survey extraction. Drop in a marine survey PDF and the AI pulls engine specs, hull data, electronics, and equipment into your vessel profile automatically. Saves hours of manual entry every time you buy a new boat.
— Per-engine fuel economy. See exactly which engine is burning more fuel at any RPM. Charts compare engines side-by-side at every cruise speed. Spot a lazy engine before it costs you thousands in repairs.
— Cruising log with photos. Document every trip with notes, weather, distance, and on-the-water photography. Build a permanent record of your adventures.
— Cost tracking that actually balances. Every receipt is logged with category, vendor, and date. Year-to-date costs always one tap away.
— Activity feed. Chronological view of every change — yours and your crew's. Like git history, but for your boat.
— Co-Captain shared access. Invite your spouse, captain, or trusted crew with read-only or full-edit permissions. Everyone looking at the same data.
— Offline-capable. Works on the water with no signal. Syncs the moment you're back at the dock.
— Photo attachments on every entry. Document parts, damage, repairs visually.
WHAT YOU CAN TRACK
— Maintenance (oil changes, service intervals, anode replacement)
— Fuel purchases and fuel-economy data points
— Parts catalogs (with OEM and aftermarket numbers, grouped by manufacturer)
— Zincs and consumables with replacement schedules
— Surveys, manuals, and reference documents
— Cruising logs with destinations, distances, and photos
— Custom categories you define yourself
PRIVACY FIRST
Sign in with Apple or email — your choice. We never sell your data, never track you across other apps, and never share with advertisers. Account deletion is one tap in Settings — your data is permanently removed within minutes.
SUBSCRIPTIONS
Bosun's Mate is free to download with a 7-day free trial of all features. After the trial, continue with an auto-renewable subscription:
— Bosun's Mate Pro Monthly — 1-month auto-renewing subscription
— Bosun's Mate Pro Annual — 1-year auto-renewing subscription
Payment is charged to your Apple ID at confirmation of purchase. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID Account Settings > Subscriptions.
Terms of Use (EULA): https://bosunsmate.app/terms
Privacy Policy: https://bosunsmate.app/privacy
Built by mariners. For mariners.
Ratings & Reviews
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Bosun's Mate is now free forever.
Log 1 vessel with unlimited entries — maintenance, fuel, costs, cruising log, cruiser contacts and photos — with no credit card, ever. Every new signup gets a 7-day trial of Pro to try charts, checklists, AI receipt scanning, unlimited vessels and co-captain sharing. When the trial ends, you keep everything you've logged and simply drop to the Free plan.
New in v1.5.0:
• Season Summary — a Pro-only recap card for any window (calendar year, cruising season, or a custom range). Distance, engine hours, fuel and total spend rolled up with averages like MPG, GPH and cost per nautical mile. Downloadable as a PDF and shareable as a beautiful image — perfect for the "look what we did this year" scroll through your marina friends.
• Checklists — winterizing, spring commissioning and pre-departure checklists with per-item notes and a full history of every run. Ideal for replacing the paper list stapled to your nav-station bulkhead.
Under the hood: • Fuel Economy charts now use cumulative math — GPH and MPG trends line up correctly month over month • New "Fuel added" field in Cruising Log entries feeds the economy math automatically • Rebuilt in-browser install flow for clearer setup • Faster login and dashboard load • Numerous small polish and stability fixes
Thank you for trusting Bosun's Mate with your logbook — and fair winds
The developer, Sean Bell, 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:
- Purchases
- Location
- Contact Info
- User Content
- Identifiers
The developer indicated that this app supports the following accessibility features. Learn More
For more information, visit the developer’s accessibility website .
Information
- Seller
- Sean Bell
- Size
- 145.3 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Bosun's Mate Annual $49.99
- Bosun's Mate Pro $4.99
- Copyright
- © 2026 Sean Bell
