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 — validated with a 96-test physics suite. 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 and 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 — inventory for rifles, optics, mounts, suppressors; maintenance logs, 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, 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
- Test — chrono session manager, MV statistics (SD, ES, CV), outlier flagging
- Records — Saved Load library tying rifle, brass, primer, powder, bullet, OAL/CBTO
- 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
- Two training plans: First 30 Days (beginner) + PRS Prep 12-Week

BALLISTIC ENGINE
- Spin drift, Coriolis, aerodynamic jump, Magnus effect
- Gyroscopic stability (Sg), per-load temperature sensitivity
- Cant angle correction across all solvers
- Transonic/subsonic detection, multi-step BCs
- 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, device barometer, GPS auto-fill
- Profile QR code sharing

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

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