Metric vs Retromulator

Metric is a pocket timing and frequency toolkit for iPhone and iPad, now with a built-in metronome. Whether you're keeping time, setting delay times in a mix, tuning an FM patch, syncing an LFO, or transposing a sample, Metric gives you instant, precise answers in one distraction-free app. Now with Siri, Shortcuts, widgets, and a Live Activity. METRONOME A precise metronome with a large tempo dial, tap-to-set tempo, adjustable time signatures and subdivisions, and a clear visual beat indicator. Background-safe timing keeps the click steady even with the screen locked. TAP TEMPO Tap anywhere on the large touch target to measure tempo. See instant BPM from your last tap and a rolling average over up to eight taps. Send either reading straight into the BPM Converter, Transpose, or LFO Rate tools with a single tap. Your tempo flows across every tool automatically. BPM → ms / Hz CONVERTER Enter a tempo and read straight, dotted, and triplet values for whole, half, quarter, eighth, and sixteenth notes. Every row shows milliseconds and frequency in Hz, so you can dial in delay, reverb pre-delay, or sidechain timing without reaching for a calculator. TRANSPOSE & SPEED Pick an original key and a target key to see the semitone shift, interval name, and exact DAW transpose value. Add an original BPM and Metric computes the new tempo and playback speed ratio. Fine-tune with a cents slider (±100) and a speed slider spanning two full octaves (±24 semitones). NOTE FREQUENCY TABLE Browse all 108 chromatic notes from C0 to B8. Each note shows its MIDI number, frequency in Hz, period in milliseconds, and sample counts at both 44.1 kHz and 48 kHz. Middle C is flagged for quick reference. Configurable A4 tuning (default 440 Hz) recalculates every value instantly. FM CALCULATOR Two modes in one tool. Ratio Explorer lets you set carrier and modulator ratios with a base frequency and choose from ten classic FM presets, from hollow octaves (1:1) to inharmonic bells (1:π). Pitch Correction mode works in reverse: pick a target note and get the exact carrier and modulator frequencies. Both modes show a sideband table with up to ten partials, their frequencies, nearest notes, and colour-coded amplitudes driven by a modulation index slider. LFO RATE CALCULATOR Convert any BPM into LFO rates across 17 musical divisions, from four bars down to 1/32 triplets. Each row displays Hz, period in milliseconds, and samples per cycle at 44.1 kHz and 48 kHz. Reverse lookup lets you enter any Hz value and find the closest matching musical division, with the error clearly shown. HARMONIC SERIES EXPLORER Start from a frequency or pick any note and see the first 32 harmonics listed with frequency, nearest note name, cents deviation, and interval label. Low-order harmonics are colour-coded for easy identification. Deviations greater than 30 cents are highlighted so you can spot inharmonic content at a glance. SIRI, SHORTCUTS & WIDGETS Drive Metric hands-free. Ask Siri to start or stop the metronome, set a BPM, tap a tempo, convert BPM to milliseconds, find a note frequency, or transpose a tempo. Every tool is a Shortcuts action too, and the BPM widget keeps your tempo on the Home and Lock Screen. TOOLS THAT TALK TO EACH OTHER Tap a tempo once and it appears everywhere: BPM Converter, Transpose, and LFO Rate all share the same live BPM. Change your A4 tuning reference and it updates across Note Frequency, FM Calculator, and Harmonics simultaneously. DESIGNED FOR PRODUCERS • Dark-mode aware interface • Adaptive layouts for iPhone and iPad • Two industry-standard sample rates: 44.1 kHz and 48 kHz Whether you're a producer programming delays, a sound designer sculpting FM timbres, a synth player tuning oscillators, or an audio engineer checking frequencies, Metric puts every timing and frequency answer in your pocket. Fast, precise, and always within reach. Try free for 7 days! After the trial, unlock full access with a one-time purchase — no subscriptions.

Retromulator is a multi-core retro hardware emulation app and AUv3 plug-in that brings legendary synthesizer, sampler, and keyboard cores back to life through authentic low-level emulation. Each core runs its actual firmware, physical model, or sample data — delivering the unmistakable character of the hardware that defined electronic music from the early 80s through the 2000s. — EMULATED CORES — VIRTUAL ANALOG SYNTHS Firmware-level chip emulation, enabled with the 56k cores option (requires M1 iPad or iPhone 15 Pro or newer): • Access Virus A, B and C — Motorola DSP 56300 recreation • Access Virus TI / TI2 / Snow — Motorola DSP 56300 recreation • Clavia Nord Lead 2X — Motorola DSP 56300 recreation • Waldorf microQ — Motorola DSP 56300 recreation • Waldorf Microwave XT — Motorola DSP 56300 recreation • Roland JP-8000 and JP-8080 — JE-8086 core by Giulio Zausa ANALOG SYNTHS • Oberheim Matrix-1000 — original firmware on an emulated Motorola 6809 board driving six CEM3396 voice models, with ROM banks 2 to 9 from the patch EPROM, a MIDI CC for each of the 96 patch parameters and LFO sync to the host tempo or MIDI clock FM SYNTHESIS • Yamaha DX7 — original chip set emulation, based on VDX7 by Charles Chiaccona • Yamaha OPL3 — Nuked OPL3 cycle-accurate FM by Nuke.YKT GM / GS SOUND MODULES • 88emu — Roland SC-88, SC-88VL, SC-88Pro, SC-8850 and SC-55mkII boards, emulation by Giulio Zausa, with GS variation, map and rhythm handling, program and drum kit names read straight from the board ROM, 16-part multitimbral operation, and a Standard MIDI File player with offline rendering to WAV or AAC. CHIPTUNE • Commodore 64 SID 6581/8580 — based on reSID. 3-voice polyphony, 8580 chip model with high-quality RESAMPLE, GoatTracker .sng / .ins bank loading (GTS3/4/5, GTI3/4/5) and .sid file import (PSID/RSID), full macro playback engine (wavetable, pulsetable, filtertable, speedtable) and live MIDI control of cutoff (CC 74), resonance (CC 71), pulse width (CC 75), vibrato (CC 1) and pitch bend. • Ayumi (AY-3-8910 / YM2149) — the PSG behind the ZX Spectrum, Amstrad CPC, Atari ST and MSX. Ayumi emulation by Peter Sovietov with the Ym2149Synth voice engine, 3-voice polyphony, switchable AY / YM engine, .ay patch loading, Factory and User banks, and 11 live CC controls. ORGAN • Hammond B3 with Leslie speaker — OpenB3, based on the setBfree engine by Michele Perrone. Upper, lower and pedal drawbars, percussion, vibrato and chorus, overdrive, reverb, three Leslie cabinets, keyboard split and .fxp presets ELECTRIC PIANO AND SAMPLER • Wurlitzer 200A — OpenWurli physical modelling by hal0zer0 (Rust ported to C++ by discoDSP) • Akai S1000 — SFZero sample engine by Steve Folta, with Bliss Sampler support and resampling engine by discoDSP (SF2 / SFZ / ZBP / ZBB) — KEY FEATURES — • Native AUv3 plug-in for AUM, Cubasis, GarageBand, Logic Pro and more • Standalone app for iPhone and iPad • Full MIDI control: CC, mod wheel, expression, pitch bend • 8-point sinc interpolation for sample playback • Auto-slice drum mapping and global retuning via MIDI • ROM firmware loading from original hardware • Background audio, iCloud and Files app integration • Optimised interpreter compatible with the iOS App Store sandbox