Zima: Ballistics Calculator

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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. Validated with a 96-test physics suite covering 4 solvers, 8 drag models, and 6 corrections. Built for precision shooters, competitive marksmen, hunters, handloaders, 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
- Automatic iCloud Drive backup with one-tap restore (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
- Apple Watch calculator and wind calls
- Home Screen widgets and Live Activities
- 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

WORKFLOW HUBS
- Range Day — session planner, live shot tracker, trend analysis
- Armory — structured inventory for rifles, optics, mounts, suppressors. Maintenance logs, loadout kits, per-optic zero history
- Hunting — hunt planner, hunt log, trophy records, GPS scouting
- Competition — match planner, live score tracker, stage breakdown, hit-rate trends
- Military / LE — mission planner, TAK broadcast, encrypted CoT storage (Pro Acknowledgment required)
- Analysis — cross-suite dashboard, drill performance over time, predicted vs actual DOPE drift detection
- AI Insights — on-device AI via Apple Foundation Models (iOS 26 + iPhone 15 Pro). Rule-based fallback on older devices. No data leaves your phone

RELOADING SUITE
- Develop — ladder tests with R² regression, OCW node detection, optimal-charge markers
- Track — per-lot ammo, powder, primer, bullet, brass tracking
- Test — chrono session manager, MV string statistics (SD, ES, CV), outlier flagging
- Records — Saved Load library tying rifle, brass, primer, powder, bullet, OAL/CBTO together
- Reference — cartridge, brass, primer, powder databases
- 24 visibility toggles with 4 layout presets

RANGE SCHOOL — LONG-RANGE TRAINING
- 61 drills across 6 pillars: Marksmanship, Positions, Wind Reading, Range Estimation, Scope/Optics, Equipment
- 290-term searchable glossary
- Quiz mode with flashcard review
- Failure-analysis library: common mistakes diagnosed by symptom
- Shot-log skill flags
- Two training plans: First 30 Days (beginner) + PRS Prep 12-Week (competition)

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
- Historical weather auto-fill via WeatherKit
- 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

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. More rigorously tested than most commercial ballistic calculators.

Built by shooters, for shooters. Found a bug? Fixed within 48 hours. Want a feature? Submit it — we WILL build it.