Discord4 vs apeMatrix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Discord4
This stereo pitch-shifting delay app offers three distinct algorithms for vintage, clean, or experimental granular effects. It features tempo-synced delays, a reverb in the feedback loop, and flexible LFO modulation for extensive sound design. Control pitch shifts with MIDI and fine-tune effects with buffer size adjustments.
- Three pitch-shifting algorithms (Vintage, Clean, Granular)
- Tempo-synced and free-running delays
- Reverb in feedback loop for shimmer effects
- Flexible LFO modulation
- MIDI note control for pitch shifting
- True stereo operation with panorama controls
- Resizable vector-based GUI
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Discord4 is the Audio Damage stereo pitch shifter, in its fourth generation. Each channel has its own pitch shifter, delay, bandpass filter, and feedback, and every repeat runs back through the shifter, so the same effect can double a vocal, stack fifths into an arpeggio, or send echoes spiraling up or down. Three engines set the character. Vintage is modeled on the H910 and H949 and has their grainy, glitchy character. Modern is cleaner and more transparent. Both have a buffer control from 32 to 2048 samples that changes the character of the shift. Granular cuts the signal into grains from 15 to 100 ms long, with an interval control and a Chaos knob that scrambles them, for anything from soft clouds to complete destruction. Detune the two sides a few cents in opposite directions over a short delay for a wide doubler. Set one side a fifth up, sync the delays, and raise the feedback so each repeat climbs another step. Keep the reverb in the loop for shimmer, then hit Freeze to hold a pad under the part. Turn on MIDI Shift to play harmonies from a keyboard, or ride the pitch wheel for bends. • Three pitch-shift engines: Vintage, Modern, and Granular • True stereo: each side has its own shifter, delay, filter, feedback, and pan, or link them so the right follows the left • Up to three octaves up or down, set by the cent or locked to semitones • Delays up to two seconds per side, free-running or tempo-synced, with feedback and cross-feedback • A bandpass filter in each feedback path, set from an XY pad • A stereo reverb inside the loop, with Freeze to hold the tail indefinitely • Saturation in the loop to keep runaway feedback in check • Two flexible LFOs for pitch, delay time, and filter frequency, shaped by Wave, Skew, and Warp, free from 0.01 to 14 Hz or synced to tempo • MIDI Shift: play the shift amount from a keyboard, with pitch bend, in hosts that send MIDI to effects • A preset browser with folders and favorites, and 50 factory presets from everyday doubling to the thoroughly strange Discord4 runs as an AUv3 plugin inside any compatible iOS host, including AUM, Cubasis, Drambo, and apeMatrix, and as a standalone app with background audio for live input. It is also available for macOS, Windows, and Linux as a desktop plugin. Requires iOS 16 or later. An AUv3 host app is recommended. No subscriptions. No accounts. No nonsense. Buy it once, own it forever.
apeMatrix
This app acts as a powerful host for audio plugins, allowing users to connect and automate various aspects of music creation. It facilitates the integration of favorite FX, MIDI routing, and control over built-in and external plugin parameters.
- Audio Unit and Inter-App Audio support
- MIDI and audio routing
- Control Manager for parameter modulation
- Multiple Matrix grids for plugin hosting
- MIDI Patch-bay for routing
- High-quality audio processing
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Holding true to the standard of apeSoft, apeMatrix continues to push the limits of possibilities in music creation. Automating almost every aspect of linked control, apeMatrix brings all your creation tools together and links them both in MIDI and audio. Letting you inject all your favorite FX both AU and IAA in a very easy and intuitive way. apeMatrix can also assign its Control Manager MIDI, Accelerometer, Scrub and LFO’s to modulate every built-in parameter and any parameter available inside the AUv3 (Audio Unit Plugins). apeMatrix offers 10 slots on each of the three Matrix grids with 2 bus slots on each grid that make it possible to interconnect all 3 Matrix. The MIDI Patch-bay also offers endless possibilities for MIDI routing and control in a similar grid design for both internal and external MIDI control. So you can send and receive MIDI and have ultimate control over where it’s routed. Each Audio Connection on the grid has its own gain control. Just tap on the node and drag will give you the full range of volume control. Or use Mixer to controls the RAU output and automate them using apeSoft’s unique Control Manager MIDI, Accelerometer, Scrub and LFO’s to modulate every built-in parameter and any parameter available inside the AUv3 (Audio Unit Plugins). Turn each slot on or off by a control switch on the Matrix or MIDI control. Control output, pan, mute and solo of each slot and Master output of each Matrix with the built in mixer control or MIDI control. Route your sounds through all a series of FX or route multiple sounds through the very some FX. The possibilities are as endless as your creativity. FEATURES High quality audio up to 32-bit 96kHz Supports Audio Unit extensions, Inter-App Audio Supports multi-channel inputs/outputs audio interfaces Supports Audio Unit Multi-bus input/output (side-chaining) 3 Matrix Audio 3 MIDI Matrix 10 Open Slots per Matrix (hosts up to 30 plugins) 2 Audio Bus Slots per Matrix 2 MIDI Bus Slots per Matrix MIDI Monitor Multi-Channel Audio Route AudioUnit Audio Send Receive Buses MIDI Scale Filtering, Transpose etc… Control Manager (MIDI, Accelerometer, LFO, Scrub) for all Built-In Parameters Control Manager (MIDI, Accelerometer, LFO, Scrub) for all AUv3 (Audio Unit Plugins) Presets Manager and Morphing Pad Save Custom AUv3 Presets Session Saving/Load Save/Load View’s Frame in Presets Transport to sends host sync to Audio Unit plugins and IAA Integrated and configurable MIDI keyboard with scales Connections output and panning controls Post Dynamic Processor Audiobus and Inter-Audio App (Sender and Fx) Audiobus state saving Ableton Link Precise MIDI Clock In/Out AudioShare Compatible AudioCopy Compatible MIDI Manager: Virtual Midi and Network, 14 bit NRPN controllers File Manager, sharing common audio files via iTunes, Dropbox and AudioCopy etc… Variable Sampling Rate (up to 96 kHz) Variable Buffering Size Variable UI Color Schemes BUILT-IN AUv3 (compatibles with other audio hosts) Configurable Sampler with scrub, playable via MIDI V-Meters Oscilloscope/Spectralscope Sender/Receiver (up to 16 buses) Send MIDI messages with LFO Gain/Pan
Screenshots
Verdict
The clearest difference is update cadence: apeMatrix at monthly against Discord4's every 14 months. apeMatrix also leads on review sentiment (73% vs 61%). Discord4's advantage is price ($8.99 vs $14.99). On rating, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Discord4 costs $8.99 and apeMatrix $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.7 for Discord4 against 4.7 for apeMatrix. Both are backed by a comparable volume of ratings — 29 and 84 respectively. Written reviews are what separate them: 61% of Discord4's written reviews are positive against 73% of apeMatrix's.
Discord4 ships an update every 14 months, apeMatrix monthly. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.
| Parameter | Discord4 | apeMatrix |
|---|---|---|
| Price | $8.99 — better | $14.99 |
| Rating | 4.7 (29 ratings) — better | 4.7 (84 ratings) |
| Positive reviews | 61.1% of reviews | 72.7% of reviews — better |
| Number of ratings | 29 | 84 — better |
| Update frequency | Every 14 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 29 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Audio Damage, Inc. | apeSoft |
Customer experience
Discord4
apeMatrix
In-app purchases
Discord4
No in-app purchases
apeMatrix
No in-app purchases









