Best In Theory alternatives: apps like In Theory - Interval Keyboard

10+ similar apps compared and reviewed

4.6 avg rating
0 free apps
Updated October 2026

In Theory is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

Top Alternatives to In Theory

Krill Synthesizer#2

Krill Synthesizer by Genuine Soundware

Virtual Analog Poly Synth
Strong Contender
🎵 Music
5.0(6 ratings)
$11.99
Krill Synthesizer screenshot 1

This virtual analog polyphonic synthesizer offers a streamlined interface for creating quick synth sounds on iPad. It features two oscillators, an LFO, a low-pass filter, two envelopes, and stereo effects, all accessible from a single screen.

Autony#3

Autony by Pagefall limited

Unreliable Sequence Generator
Worth Considering
🎵 Music
4.5(39 ratings)
$3.99
Autony screenshot 1
Autony screenshot 2

This app generates evolving musical sequences using a MIDI signal. It can be constrained to scales and chords, transposed, and mutated for dynamic musical output. All controls are MIDI-automatable and it requires a host app to function.

More apps like In Theory

4
takeamidi
takeamidi
takeamidi
recorder / monitor / filter
$1.99

This tool allows you to monitor, filter, and record MIDI input. It captures recent MIDI data into a buffer, which can then be exported as a MIDI file. You can also use it to filter various MIDI message types.

MIDI monitoringMIDI filteringLive MIDI sampling
🎵 Music
(11)
paid
5
WoodScaper
WoodScaper
WoodScaper
guitar effects
$9.99

This app offers a versatile suite of four classic guitar effects: phaser, chorus/flanger, wah-wah, and tremolo. It provides extensive customization options for each effect, allowing for complex sound design and routing possibilities. It functions as both a standalone application and an AUv3 effect.

Four classic guitar effects: phaser, chorus/flanger, wah-wah, tremoloAdvanced LFO modulation with multiple waveforms and sync optionsFlexible routing: series, parallel, and custom combinations
🎵 Music
(7)
paid
6
midifruuze
midifruuze
midifruuze
midi sampler / live effect
$3.99

Capture and replay MIDI data with various playback modes. This tool allows for live manipulation of MIDI notes, offering creative control for musicians and producers. It functions as a standalone app or an Audio Unit extension.

Live MIDI data capture10-second MIDI bufferScrub Pitch playback
🎵 Music
(7)
paid
7
mKer
mKer
mKer
AUv3 MIDI step sequencer
$3.99

A versatile MIDI step sequencer designed for music creation. It offers multiple outputs, extensive pattern and lane customization, and advanced step editing. Best used within an AUv3 host app for sound generation.

8 MIDI outputs64 Patterns with 16 Lanes eachCustomizable Steps and Step Size per Lane
🎵 Music
(22)
paid
8
ChaosArp
ChaosArp
ChaosArp
Chaotic MIDI arpeggiator
$3.99

This music app generates complex and dynamic MIDI patterns using advanced algorithms. It offers a unique rhythm event feature and variance control for extensive customization, allowing users to create evolving musical sequences.

Arpeggiator and step sequencer modesRhythm event feature with 13 algorithmsPitch and rhythm variance control
🎵 Music
(9)
paid
9
luapsel
luapsel
luapsel
Reverse Guitar App & AUv3
$0.99

Create calming electric guitar ambience with reversed samples and built-in effects. Offers polyphonic playback, multiple articulations, and real-time sound shaping tools for unique musical textures.

Polyphonic reversed guitar soundsRound Robin samplingMultiple articulations
🎵 Music
(4)
paid
10
spectwhirl
spectwhirl
spectwhirl
hybrid spectral effect
$4.99

This audio effect app transforms input sound into new textures and bell-like tones by extracting and manipulating sinewave components. It offers advanced control over delay lines, frequency shifting, and filtering, with gesture recording for parameter automation.

Sinewave component extraction and groupingDelay lines with feedbackFrequency shifter and sample-and-hold effects
🎵 Music
(5)
paid