Collection software for firearms, coins, stamps, knives, Japanese swords, geological specimens & more - offline - no cloud risks - Windows, Mac, Linux, iOS, and Android.
Try full features Free for 30 Days - No Credit Card. After 30 days you can upgrade or continue to use free version.
Secure Offline Collection Management Software for Serious Collectors - Windows, Mac, Linux, iOS, and Android.
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"The Most Secure Collection Management Software Available" ​
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Zero data collection - see Privacy page for details
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100% offline
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Unlike cloud-based solutions, your data never leaves your device
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Works with Windows BitLocker, macOS FileVault, and Linux encryption for maximum security.
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Designed for air-gapped systems - no network access required.
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See Security Page for details.
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Manage your valuable collections with complete privacy and security. NM Collector
is professional-grade collection management software that works 100% offline—no
internet required, no cloud risks, subscription is optional.
Perfect for firearms, coins, stamps, knives, home inventory, and any collection
you can imagine. Track values, store high-resolution photos, maintain insurance
records, and access your data anywhere on Windows, Mac, Linux, iOS, and Android
devices.
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Platforms
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nmCollector is available as:
All versions are designed to operate fully offline.
Data is stored locally on the user’s device and is never uploaded to nmCollector servers.
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What about encryption?
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For off-line use, like NM Collector Software, it is best to encrypt your hard drive or selected folders on your hard drive using Operating System level encryption tools rather than application level tools. Visit my How to Encrypt Your Data blog to find out why.
Specialized Collection Templates
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NM Collector includes professionally designed templates for:
- Firearms & Gun Collections (ATF-compliant bound book reporting)
- Numismatic Collections (Coins with PCGS/NGC grading)
- Philatelic Collections (Stamps with Scott catalog)
- Knife & Blade Collections
- Nihonto Collections (Japanese Swords - authentic terminology)
- Geological Specimens (Rocks, Minerals, Fossils)
- Home Inventory for Insurance
- Any Collection Type (Build your own template)
Why Choose NM Collector?
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100% Offline: Your data never leaves your devices. No cloud storage, no servers to breach, no internet required. See Security page for details.
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All Your Collections: One software for firearms, coins, stamps, knives, and any collection you imagine. Stop paying multiple subscriptions. See Features page for details.
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Zero Data Collection: We don't track you, analyze your usage, or collect information about your collections. Ever. See Privacy page for details.
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No Subscription Required: Free version available forever. Optional one-time purchase for full features. No recurring fees unless you want to use a subscription option.
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General Features:​
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Works offline - no internet required: Securely manage your collection without an internet connection. See Security page for details.
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Great for reference and/or sharing anywhere with or without an internet connection: Know what you have and details about it when considering the purchase of a similar item. Share information and pictures of your collections with others using your computer and/or mobile device. See Features page for details.
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Important for insurance: Capture key information about your home inventory and/or collections for insurance purposes.
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Easier to update than paper: Make changes to your notes without having to rewrite them on paper and reorganize/rewrite other records to fit? If you like paper you can print your records.
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Drag and Drop pictures from your file system to the pictures tab - no need to navigate to them. If you want to reference external links you can drag and drop them too.​​
Your data stays private, no cloud or external service required. It can even be used on air-gapped computers. If you want to share your data online you can. It's your choice.
All Platforms (Windows, Mac, Linux, iOS, Android.)
​Mobile Apps (iOS, Android)
The nmCollector mobile apps for Android and iOS allow collectors to view, add, and manage their collections while offline.
Mobile apps store data locally on the device and do not require an internet connection or cloud account.
Any Collection
You can customize existing collection templates or create your own.
Try full featured version for free
You can use the full feature version for 30 days. If you like it you can purchase an activation to keep it as is. If you do not purchase and activation you can continue to use a less feature-rich version for free. You will not lose any data if you choose to activate it at a later date.
See It in Action
Track your Firearms offline - sample Pictures Tab.
Track your home inventory for insurance or other purposes.
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"Great record keeper. As a collector of several different types of items this is by far the most comprehensive and/or easiest app to keep records for collectors."​
- tesnevo, 03/20/2023
About nmCollector.net LLC
Seeking to Serve the Collecting Community
nmCollector.net LLC began in the year 2000 when Clay Pryor began selling his NM Gun Collector Software online. After receiving multiple requests for collecting software for different computer operating systems and collection types, nmCollector.net answered the call with NM Collector Software JE. This software became popular enough to justify incorporating in 2010. Recognizing the need for mobile products nmCollector.net introduced NM Collector for the Android in late 2011.
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After retirement from full time employment, Clay developed a whole new product he calls NM Collector Software Cross Platform that provides a unified interface and easy data sharing across all popular platforms ... Windows, Mac, Linux, iOS, and Android.
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Collection Types Supported:
- Firearms & Gun Collections (FFL/ATF-compliant bound book formatting)
- Numismatic Collections (Coins - PCGS/NGC grading, mintage, varieties)
- Philatelic Collections (Stamps - Scott catalog, watermarks, perforations)
- Knife & Blade Collections (Custom knives, tactical, patterns, makers)
- Nihonto Collections (Japanese Swords - mei, hamon, hada, nagasa)
- Geological Specimens (Rocks, Minerals, Fossils - Mohs scale, classification)
- Home Inventory (Insurance documentation, room-by-room)
- Custom Collections (Fully customizable templates)
About Clay
Clay is a veteran software and database application developer with more than 40 years of experience across government, corporate, and national laboratory environments. His career began at the Air Force Weapons Laboratory in the late 1970s, followed by roles at IBM and the State of New Mexico’s Natural Resources Department in the mid 80's.
After that he spent 34 years at Sandia National Laboratories, where he designed and supported enterprise and desktop systems, modernized data‑driven applications, and led major improvements in enterprise search capabilities—earning recognition from Sandia’s Laboratory Director in 2018.
Clay continues to explore emerging technologies in search, data management, and application development, driven by a lifelong curiosity and a commitment to practical, effective solutions.