Hatchmark
Fly Fishing Field Journal
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
The fly box that fills as you fish. 67 patterns, 12 months of hatch data, an offline knot library, and a journal that remembers every cast.
Hatchmark is a fly fishing field journal built for anglers who care about the details.
Your fly box starts empty. As you log sessions and add the patterns you actually tie, it fills with the flies that matter to you — not a generic reference set. Every entry builds your fishing story.
WHAT'S INSIDE
Your Personal Fly Box
- Start empty, fill as you fish
- Add patterns by logging a session, or browse the full 67-pattern catalog
- Multi-page expansion once your collection grows
- Personal notes on every pattern
The Pattern Catalog
- 67 hand-illustrated fly patterns
- Organized by Dry Fly, Nymph, Streamer, Wet Fly, Emerger, Terrestrial, Worm, Egg, and Specialty
- Recommended sizes, when to use, and field notes for every pattern
The Hatch Guide
- 12 months of Rocky Mountain hatch data
- Insect identification with scientific names and sizes
- Matching fly pattern recommendations for every hatch
- Tap any pattern to view the full detail
- Works completely offline
The Knot Library
- Six essential fishing knots with step-by-step illustrations
- Clinch, Improved Clinch, Palomar, Blood, Surgeon's, and Loop
- Available offline wherever the river takes you
The Logbook
- Capture every session in seconds
- Date, water, species, fly used, environmental conditions
- Year-filtered statistics and a season heatmap
- Your fishing year, visualized
OFFLINE BY DESIGN
Hatchmark stores everything locally on your device. The full pattern catalog, hatch guide, and knot library work without any internet connection. Your sessions and notes belong to you — no servers, no tracking, no telemetry.
HATCHMARK PREMIUM
Hatchmark requires a subscription to access full functionality after a 7-day free trial.
- Monthly: $4.99/month
- Annual: $39.99/year (save 33%)
Subscription auto-renews unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID subscription settings.
- Terms of Use: https://vulcansystems.io/hatchmark/terms
- Privacy Policy: https://vulcansystems.io/hatchmark/privacy
- Support: https://vulcansystems.io/hatchmark/support
Built by anglers, for anglers. From Vulcan Systems.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Vulcan Systems LLC, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 76.2 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 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
- Hatchmark Premium (Annual) 44,99 €
- Hatchmark Premium 5,99 €
- Provider
Vulcan Systems LLC
- Vulcan Systems LLC has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2026 Vulcan Systems LLC