Zima: Ballistics Calculator

v2.0 ships 7 new workflow hubs, Reloading Suite, Range School training, AI Insights, and backup that covers everything. Free to try, $19.99 to unlock all.

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.