MODARSENAL
Firearms
Every firearm gets its own record sheet, round counter, statistics, calendar and timeline. One place holds its details and complete history — from purchase through the latest session, malfunction or cleaning.
The full history
of your guns.
Yours alone.
Every round has a history. GunMaster ties firearms, ammunition, range sessions, cleanings, malfunctions and gear setups into one log. No account, no cloud, and no need to stay online.
Coming soon
See how it works ↓
Account required
NONE NO SIGN-UP
Where data lives
ON DEVICE NO CLOUD
Analytics and trackers
ZERO NO TELEMETRY
Backups
YOURS ENCRYPTED FILE
The problem
A notebook remembers.
It doesn't answer.
A notebook records the session. It won't connect it to the rest of the history — or tell you:
FAILURESThat four of your last six malfunctions came from the same ammunition.
ROUNDSThat this pistol has 1,200 rounds on it since its last cleaning.
GEARWhich optic was on this rifle a year ago, and how many rounds it saw while it was mounted.
PHOTOSThe target photo from that series, filed against the series it came from — not loose in your phone's gallery.
◫ MORE THAN A NOTEBOOK
GunMaster starts where the notebook stops. Everything that used to go on paper — the session, the cleaning, the malfunction, the purchase, the setup change — goes in exactly once. GunMaster connects each entry to the right parts of your collection and automatically updates whatever it touches — ammunition stock, round counters, mount history, the calendar and the statistics.
◫ NO SPREADSHEET
You don't have to be a spreadsheet wizard. The charts and the totals come out of the entries you already made — no formulas, no columns to keep tidy, and no spreadsheet to quietly abandon in March. The statistics aren't a separate chore. They're what the log adds up to.
The logging engine
One session.
The whole logbook updated.
TypeSHOOTING SESSION
FirearmGLOCK 17 GEN5
Series3
Rounds total150 RDS
Save
SERIES 1
FEDERAL HST 9×19 JHP · 50 RDS
15 M · MAG #2
◫ IMG_0117.JPG
SERIES 2
FEDERAL HST 9×19 JHP · 50 RDS
15 M · MAG #2
◫ IMG_0118.JPG
SERIES 3
FEDERAL HST 9×19 JHP · 50 RDS
25 M · MAG #4
◫ IMG_0119.JPG
→ FIREARM
Glock 17 Gen5: round count +150, rounds since last cleaning 150, statistics, calendar and timeline updated.
→ AMMUNITION
Federal HST 9×19 JHP: stock −150 → 1,240 rds, rounds fired, total spend and average price per round recalculated.
→ GEAR
The red dot that was mounted: resolved from mount history, so the session knows how the gun was set up — a year later, too.
◫ SERIES
A session isn't just one total — it's series after series. Each series carries its own round count, distance, ammunition, magazine and a photo of the target. Accessories mounted at the time come from mount history. Ammunition stock updates itself as each series is saved.
✕ MALFUNCTION
Log a malfunction against the firearm and name the ammunition and the magazine involved. That's what turns ten scattered entries into an answer: whether the same ammunition or magazine keeps showing up — and whether the firearm is really the common factor.
What you track
More than inventory.
The full history of your collection.
An inventory is only the beginning. Every event you log becomes part of your collection's history, tying firearms, ammunition and accessories together while GunMaster automatically updates round counts, ammunition stock, timelines, calendars and statistics.
MODSTOCK
Ammunition
You know how much ammunition you have, how much you've fired and what you have spent on it. Purchases add to the stock, sessions draw it down, and corrections bring the ledger back in line with what is actually on the shelf.
MODGEAR
Accessories
Each accessory category has the fields it needs — from scopes and red dots to grips and other gear. Mount an accessory to a firearm and GunMaster records the setup you were shooting with during the session.
MODEVENTS
Events
A session, a cleaning, a malfunction, a purchase or a change of setup goes straight into the history of the item it happened to. Log the event once — GunMaster automatically updates the relevant round counters, ammunition stock, statistics, calendars and timelines.
MODUSAGE
You don't have to own it
A club gun, a rental, a friend's rifle or something you are testing before buying? Add it with the status User rather than Owner and log every round you put through it. Your shooting history stays complete, whoever the gun belongs to.
Screens from the app, with generated sample data.
◫ HOME SCREEN
Open the app and you know straight away where your collection stands. You see the counts for firearms, ammunition and accessories, the units due a cleaning, your last session and rounds fired per month. Below that are charts of ammunition stock and rounds by caliber. All of it comes out of the log automatically — there are no statistics to fill in separately.
Your data after a year with the app could look like this
0
rounds logged · 30 sessions · 18 cleanings · 0.43 per round
Ammunition purchased
3,600 RDS
Target photos
64 ON THE PHONE
Malfunctions
6 0.20% OF ROUNDS
Mount changes
12 MOUNTED / DETACHED
What it adds up to
Data,
not guesswork.
GunMaster builds the statistics automatically from the events you log. Every session, purchase, cleaning or malfunction updates the related figures without any extra counting or copying data between records. All of it happens locally on the phone, from your own log.
ROUNDS
Rounds by firearm, by caliber and by month, plus a rounds-since-last-cleaning counter for every unit.
STOCK
Current ammunition stock by caliber, updated automatically by purchases and sessions.
FAILURES
Malfunctions linked to the firearm, the ammunition and the magazine you were using at the time.
DISTANCE
Rounds by distance — you see the ranges you actually practice at.
GEAR
Accessory usage history shows which firearm each one was mounted on and how long it stayed in that setup.
Privacy
We don't hold any of it.
Your data stays with you.
SECOFFLINE
No account, no cloud, nothing from your log sent to our servers. Firearms, ammunition, accessories, photos and event history are stored locally on the phone. GunMaster uses no analytics and no third-party crash reporting service.
SECEXCEPTION
The only time GunMaster goes online. The connection is used only to handle and verify your subscription through the app store.
SECLOCK
A six-digit PIN, available without Premium. The lock can guard the app when it starts and when it comes back from the background. Repeated wrong attempts lengthen the wait, and restarting the app does not reset it. The PIN cannot be recovered, because it never leaves the device.
SECBACKUP
One encrypted file, your password.
You can export the whole log together with the photos to a .gmb file and keep it wherever you like.
A restore checks the backup first, and your existing data is protected against being overwritten.
Access
Catalog your whole collection for free.
Premium unlocks full history across all of it.
Add any number of firearms, ammunition entries and accessories. Every entry stays viewable and editable without a subscription. Premium unlocks logging new events across the whole collection. On the free plan, you can keep the full history of your first 3 firearms, 6 ammunition entries and 6 accessories.
COLLECTION
Firearms, ammunition and accessories with no limit — along with photos, specifications and purchase details.
EDITING
Every item and every event you have already logged can be corrected later — without Premium too.
LOGGING
You log new events free on your first 3 firearms, 6 ammunition entries and 6 accessories.
LOCK
The 6-digit PIN app lock is available on every plan.
BACKUP
Encrypted export and backup restore are available without Premium.
FREE
PREMIUM
ITEMSfirearms, ammunition, accessories
UNLIMITED
UNLIMITED
EDITING ITEMSat any time
YES
YES
EDITING EVENTSalready logged
YES
YES
NEW EVENTSfirearms
FIRST 3
UNLIMITED
NEW EVENTSammunition
FIRST 6
UNLIMITED
NEW EVENTSaccessories
FIRST 6
UNLIMITED
BACKUPencrypted .gmb file
YES
YES
APP LOCK6-digit PIN
YES
YES
◫ WHEN PREMIUM?
Only once you want to keep a full history for a larger collection. If the subscription lapses, all your data stays where it is and you can still view and edit it. The only thing limited is adding new events beyond the free allowance.
Questions
FAQ
01Do I need an account?
No. There is no sign-up and no login. You install the app and can start keeping your log right away.
02Does my data go to a server?
No. Firearms, ammunition, accessories, photos and event history are stored locally on the phone. GunMaster connects to the internet only to handle and verify your subscription through the app store.
03Does it work without internet?
Yes. The whole log works offline — you can add and edit data, record sessions and use the statistics with no signal. The internet is only needed to handle and verify your subscription through the app store.
04What happens when I change phones?
You create an encrypted backup in a single .gmb file, move it to the new phone and restore it in GunMaster. Export and restore are available without Premium.
05Can I lose my data?
As with any other data kept locally, losing or damaging the phone can mean losing it. That is why GunMaster lets you create encrypted backups that you can store in a place of your own choosing.
06What if I forget my PIN?
The PIN cannot be recovered, because it is never sent or stored outside the device. The app warns you about this before you turn the lock on. If you need to, you can restore an encrypted backup of your data on a fresh install.
07Can I keep the backup in the cloud?
Yes. The .gmb file is encrypted with a password you choose, so where you store it is up to you — a computer, an external drive or your own cloud.
08What happens if I cancel Premium?
You don't lose access to any of your data. You can still view and edit the whole collection and create backups. The only thing limited is adding new events beyond the free allowance.
09What exactly do I get for free?
You can add any number of firearms, ammunition entries and accessories and store their photos, specifications and purchase details. You log new events free on your first 3 firearms, 6 ammunition entries and 6 accessories. Premium extends full history logging to the whole collection.
10Which languages are supported?
Polish, English and German. The app also adapts date and number formats to the chosen language. You can change the language in settings or leave it following the system settings.
11Can I add a firearm I don't own?
Yes. You can give it the status User rather than Owner and log rounds fired through a club gun, a rental, a friend's gun or one you are testing before buying.
Your collection has a history.
Keep all of it.
Every session, cleaning, malfunction, purchase and setup change becomes part of one connected history — kept locally on your phone.
Coming soonAndroid · works fully offline · no account · encrypted backup you hold