DB Killer Calculator vs VoltLog

DB Killer is a practical calculator for motorcycle exhaust DB-killer design and comparison. Enter your exhaust and engine parameters, then adjust DB-killer geometry to estimate flow area, flow ratio, gas velocity, likely power loss, and approximate sound attenuation. The app also includes a sound simulator and side-by-side configuration comparison so you can quickly evaluate different hole counts, hole diameters, center openings, and DB-killer lengths. Features: - DB-killer geometry calculator - Exhaust pipe and hole area calculations - Flow ratio and gas velocity estimates - Approximate power loss estimate - Approximate dB reduction estimate - Sound simulator with automatic or manual baseline dB - Side-by-side configuration comparison - Metric and imperial units - Multiple interface languages - Local preference saving - No account required DB Killer is designed as an engineering-style estimation tool for riders, builders, fabricators, and exhaust tuning enthusiasts. Important: Results are estimates only. The app does not certify legal road use, emissions compliance, racing class compliance, or official sound test results. Always check local regulations and verify final setups with proper measurement equipment.

VoltLog is a field tool for FPV pilots who use LiPo, LiHV, and Li-ion battery packs without smart battery electronics. After a flight, log the pack voltage and VoltLog shows the safety status of each battery on a clear, color-coded dashboard. The goal is simple: know which packs are safe for storage, which need charging, and which should not be left full for too long. Built for FPV battery routines: - Track battery packs with name, brand, cell count, capacity, chemistry, and cycle count - Log voltage per cell with a large custom keypad - See STORAGE, CHARGED, FULL, FULL RISK, DISCHARGED, and CRITICAL states at a glance - Open full cycle history for every pack - Set global and per-battery alert timing - Use local notifications for risky full packs and low-voltage reminders - Work offline-first with local Drift storage - Secure or switch accounts with Supabase Auth when you want cloud-backed data VoltLog is not a charger, cell checker, or battery management system. It is a practical logbook for pilots who already measure voltage and want a faster way to keep track of many packs. Designed for the field, not a desk: - High-contrast dark dashboard - Large battery tiles - Fast voltage entry without the system keyboard - Battery archive for retired packs - English and Polish interface If your FPV case has more packs than memory can reliably track, VoltLog gives you one place to see what needs attention before battery degradation becomes expensive. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/