Best Extension Audio Apps

AudioKit Synth One Synthesizer

Feature-packed Pro Synthesizer

Free

This is a free, open-source professional synthesizer app for iOS devices. It offers over 300 presets, MIDI support, a sequencer, and vintage-inspired filters. Learn music production basics and create your own sounds.

WaveFolder - Audio Unit

Wave Folding Distortion Effect

$4.99

This audio effect app adds harmonics to sound by folding waveforms. It's ideal for enhancing synth leads, transforming drum loops, and creating ambient drones. Customize folding thresholds and modulation for unique sound design.

Time Stretch (Speed Change)

31 bands EQ / Export audio

Free

This music player allows real-time audio processing, including adjustable playback speed and a 31-band equalizer. It supports AUv3 effects, A-B looping, and background playback, with options to import audio files from other apps.

Tone Generator: Frequency Hz

Instant Tuning & Ear Training

Free

Generate precise audio tones for tuning instruments, testing sound equipment, or practicing ear training. This app offers a clean, focused experience with no ads or accounts, working offline for instant reference.

Audio Editor - Mp3 Converter!

AI Music Trim Cut

Free

This app allows you to record voice memos, cut and trim audio files, and merge music. It supports importing music from your library and offers premium features through a subscription.

Google Translate

Text, Photo & Voice Translator

Free

Instantly translate text, voice, and images between hundreds of languages. Features include offline translation, real-time conversation translation, and the ability to save frequently used phrases.

Audio Unit Player

AUv3 host / Export audio

Free

This music player offers real-time audio processing, including time stretching, pitch shifting, and a 31-band equalizer. It supports AUv3 effects and allows for A-B loop playback, making it ideal for practice, transcription, and performance adjustments.

Audio Booster Higher Volume EQ

Speaker Sound Amplifier Louder

Free

Easily increase the volume of any audio file, from podcasts to music, with a simple interface. Achieve studio-grade precision to boost audio up to 30 dB and export high-quality files for sharing.

Pitch Changer · Transpose Tool

Shift Pitch, Edit Tune & Tone

Free

Easily shift, transpose, and transform audio files without losing quality. This tool offers professional-grade pitch changing for beginners and experts alike, perfect for practice, remixing, or music production. It supports batch processing and works offline.

Offline Music Player‧‧

Play MP3, FLAC, WAV and M4A

Free

Play all your audio files, including music, audiobooks, and voice notes, with a powerful and intuitive player. Enjoy offline playback, smart organization, custom playlists, and a sleep timer for a seamless listening experience.

Audio Editor - MP3 Cutter App

Convert, Merge & Trim Audio

Free

This app offers comprehensive audio editing tools, including trimming, merging, format conversion, and ringtone creation. It also features AI-powered speech-to-text transcription, noise reduction, and text-to-speech capabilities for various audio projects.

Musiboot: Get Lossless Music

Volume Booster with HD Sound

Free

Amplify your device's audio output by up to 500% for richer, lossless music and clearer sound. This app lets you exceed standard volume limits for an immersive listening experience, turning your phone into a powerful mini speaker.

King of FM 2: DX Synth/E Piano

#1 DX7 Sounds & Electric Piano

Free

Experience classic 80s FM synthesizer and electric piano sounds with over 300 unique presets. This app offers professional-grade audio, extensive layering for expressiveness, and a full suite of effects. It functions as a standalone app and an AUv3 plugin for music production hosts.

Sidus Audio

by Sidus Link Ltd.

Free

This app allows professional audio engineers and sound enthusiasts to wirelessly connect and control multiple audio devices. It features an intelligent network for stable communication, centralized monitoring, and parameter presets, all accessible through a user-friendly interface.

Voice Recorder Audio Record HD

Record audio, notes,transcript

Free

Record, organize, and edit audio with ease. Capture meetings, lectures, and ideas with clear controls, background recording, and advanced playback options. Manage your recordings with notes, folders, and searchable tags.