Zima: Ballistics Calculator

The most comprehensive ballistic solver ever built — 200+ features in one app. Independently verified against JBM Ballistics reference data.

Four solver models (3DOF, 4DOF, 6DOF, Pejsa), nine drag models, and every correction factor known to ballistic science. Built for precision shooters, competitive marksmen, and trained professionals who demand accuracy at every distance.

FREE FEATURES
- Full ballistic calculator with trajectory tables
- G1/G7 drag models with atmospheric corrections
- Up to 3 rifle profiles with load data
- Point blank range, effective range, and basic tools
- Quick Solve mode for rapid field calculations
- Cloud backup via Google Drive / Dropbox / OneDrive (free for everyone, no Pro gate)

UPGRADE TO PRO ($19.99 one-time — no subscription)
- All four solver models (3DOF, 4DOF, 6DOF, Pejsa)
- 5,600+ bullet and cartridge database
- Interactive 3D trajectory visualization
- WEZ hit probability analysis (Monte Carlo)
- PDF range cards, CSV/XLS export, DA Form 5517
- GPS target ranging on real-time maps
- Device barometer and camera inclinometer
- Bluetooth: Kestrel, rangefinders, chronographs
- Competition mode with PAR timer
- Night-vision HUD mode
- Wear OS companion calculator
- Home Screen widgets
- Training modes (range estimation, wind estimation)
- TAK/ATAK tactical network integration
- DOPE book, cold bore tracking, barrel life
- Ammo inventory, suppressor profiles
- Reticle simulator with 400+ reticles
- DIY reticle creator
- And 100+ more tools

BALLISTIC ENGINE
- Spin drift, Coriolis effect, aerodynamic jump
- Magnus effect, gyroscopic stability (Sg)
- Temperature sensitivity per load
- Cant angle correction across all solvers
- Transonic and subsonic detection
- Multi-step ballistic coefficients
- Custom drag curves (JBM CSV, Lapua Doppler)
- Zero atmosphere BC correction

FIELD READY
- Offline topo maps with range/bearing HUD
- Open-Meteo weather auto-fill
- Camera inclinometer for angle measurement
- Device barometer for pressure readings
- GPS auto-fill for Coriolis calculations
- Profile QR code sharing

COMPETITIVE SHOOTING
- Stage planner with target cards and PAR timer
- Match score tracker with CSV export
- Come-up card printing (scope cap, arm board)
- Load comparison with overlay charts
- Rapid engagement multi-target solver

PROFESSIONAL USE
- TAK/ATAK server integration (CoT, GeoChat)
- MGRS coordinate conversion
- DA Form 5517 military range cards
- Anti-materiel reference data
- Barrier penetration modeling
- Encrypted CoT storage

PRIVACY-FIRST
- No accounts. No third-party tracking. Anonymous, aggregated usage diagnostics (no personal data) help us prioritize fixes.
- All ballistic profiles, shot logs, and DOPE data stay on your device
- Optional cloud backup uses a provider you choose (Google Drive, Dropbox, OneDrive)
- Beyond anonymous diagnostics and an automatic check for updated ballistic reference data, network requests happen only when you explicitly trigger them (weather, cloud backup, TAK)

VERIFIED ACCURACY
Independently verified against JBM Ballistics reference data with a 96-test physics validation suite. Covering all 4 solvers, 8 drag models, and 6 correction factors.

Built by shooters, for shooters.