DJ Calculator vs Surviving Audio

Tempo, simplified. DJ Calculator is the essential toolkit for DJs and producers. Tap BPM, match harmonic keys, and find the right tempo in seconds. Whether you're preparing for a club set, vinyl session, or studio mix, DJ Calculator helps you create smoother transitions with confidence. Features Tap BPM Quickly calculate tempo and instantly view half-time, double-time, and pitch-adjusted BPM values for seamless mixing. Harmonic Mixing Mix in key using the Camelot Wheel. Discover compatible key matches, build energy, shift mood, and create smooth musical transitions. Genre BPM Guide Browse common BPM ranges across Hip-Hop, House, Tech House, Techno, Trance, Drum & Bass, Amapiano, Afrobeat, Reggaeton, and more. Why DJs Choose DJ Calculator • Fast, clean interface • Works completely offline • Designed for quick reference during practice or performance • Built by a DJ, for DJs Perfect For • Learning beat matching and harmonic mixing • Preparing club, festival, and vinyl sets • Mixing across multiple genres • Planning smoother transitions before a performance • Producing and arranging tracks in the studio

Plan the show, before the show. Surviving Audio is the pre-show planning suite for working sound engineers. Built around real-world workflows from the live PA design playbook — McCarthy-grade math, dynamically visualized, with practical guides on every tool. The big six: Stereo PA Quick-Eval — Type room dimensions (W × D), get a complete system recommendation: speaker spacing, coverage range, throw distance, FAR/LAR, plus a class verdict (long-throw, standard, wide, multi-box). Answers "which system do I bring?" in 30 seconds. Multi-Tower Delay Chain — One tower? Five towers? The app calculates the position and electrical delay for every tower based on your venue depth and the 40 ms threshold (temperature-adjusted). Visualizes the entire chain with side-elevation diagram. Spatial Crossover — The exact position where main and delay tower meet at equal level, plus the delay setting in ms and samples. Includes a level-vs-position SPL plot showing the transition zone. Sub Setup Recommende — Number of subs + crossover frequency + stage width = the right configuration. Single, coupled, stereo (with power-alley warning), cardioid stack, end-fire, distributed, or coupled block. Each rendered as a top-down stage diagram with λ/2 reference. Cardioid + End-Fire Sub Designer — Calculate delays, polarity, and forward gain. Interactive polar plots at chosen frequency. Top-down layouts with dimensioned spacing. Line Array Splay (Field Estimate) — Rough estimation of splay angles using only a laser distance meter. Side-elevation showing progressively splayed boxes. Pre-MAPP/ArrayCalc reality check. And much more: