Comparison

Discord4 vs JMP Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

JMP Pro

This app emulates a classic guitar preamplifier, offering four distinct channels for various tones from clean to high-gain metal. It includes a power amplifier, digital delay, analog modulations, and reverb. It functions as a standalone app or an audio effect.

Highlights
  • Four distinct amplifier channels
  • Virtual EL34 power amplifier
  • Digital delay with filter and offset
  • Analog chorus and tremolo modulation
  • Hall reverb algorithm
  • Noise gate and studio compressor
Features
Read full description

PREAMPLIFIER Nembrini Audio JMP Pro Guitar Amplifier plugin is based on a Marshall JMP1* preamplifier. JMP Pro Valve Amplifier drives pure tone into each of its four uniquely voiced channels OD1, OD2, Clean1 and Clean2 OD1: This channel’s smouldering power will take you from the molten gold of a classic British sound, to searing metal and all points in between. OD2: Tightly focused, high gain is served up here by the truckload. Modern and aggressive, yet fluid and toneful. This channel has all the distortion and sustain you’ll ever need. Clean1: It is perfect for warm full-bodied chords, fat clean lead passages and jazz tones. Clean2: It has the glassy edge of a classic British sound for those bright, jangly tones. POWER AMPLIFIER Powered by four EL34 virtual tubes with presence, volume and power switch in class AB push-pull configuration. DIGITAL DELAY FILTER make the delay Lo-Fi and OFFSET create a time offset in left/right delay sections ANALOG MODULATIONS select Chorus or Tremolo modulation AMBIENT REVERB Hall reverb algorithm FILTERS CLEANER Low and High cut filters PRE and POST amplifier ANALOG NOISE GATE tuned for guitar and bass STUDIO COMPRESSOR keep your dynamics in check, whether just thickening the sound or keeping levels consistent Works as a standalone app, AudioUnit v3 effect, or Inter-App Audio effect. Legal Disclaimer: JMP1 is a registered trademark of Marshall Amplification PLC. Nembrini Audio JMP Pro was developed by Nembrini Audio SRL based on its own modelling techniques. Marshall Amplification PLC has not endorsed nor sponsored the Nembrini Audio JMP Pro in any manner, nor licensed any intellectual property for use in this product.

Screenshots

Discord42 screens
JMP Pro2 screens

Verdict

The call

The clearest difference is review sentiment: JMP Pro at 100% against Discord4's 61%. JMP Pro also leads on rating (5.0 vs 4.7). Discord4's advantage is price ($3.99 vs $9.99) and update cadence (every 14 months vs every 50 months). On ads, in-app purchases, monetization model and device support 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

CostPrice · In-app purchases · Ads · Monetization

Discord4 costs $3.99 and JMP Pro $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

JMP Pro holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Discord4 has 29 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 61% of Discord4's written reviews are positive against 100% of JMP Pro's.

UpkeepUpdate frequency

Discord4 ships an update every 14 months, JMP Pro every 50 months. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
Discord4 versus JMP Pro: the parameters behind the verdict, then further details
ParameterDiscord4JMP Pro
Price$3.99 — better$9.99
Rating4.7 (29 ratings)5.0 (4 ratings) — better
Positive reviews61.1% of reviews100.0% of reviews — better
Number of ratings29 — better4
Update frequencyEvery 14 months — betterEvery 50 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015 — better
Further details — not scored
Size29 MB30 MB
Age rating4+4+
DeveloperAudio Damage, Inc.Nembrini Audio

Customer experience

Discord4

All ratings29 ratings
Positive93.1%
Neutral0.0%
Negative6.9%
Written reviews18 reviews
Positive61.1%
Neutral11.1%
Negative27.8%

JMP Pro

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Discord4

No in-app purchases

None

JMP Pro

No in-app purchases

Questions

Is Discord4 free?
Discord4 costs $3.99, with no in-app purchases.
Is JMP Pro free?
JMP Pro costs $9.99, with no in-app purchases.
Which has better reviews, Discord4 or JMP Pro?
JMP Pro is rated higher. Discord4 averages 4.7 out of 5 from 29 ratings, while JMP Pro averages 5.0 from 4 ratings.
Do Discord4 or JMP Pro have ads?
Neither Discord4 nor JMP Pro shows ads.
Which is updated more often, Discord4 or JMP Pro?
Discord4 ships an update every 14 months, and JMP Pro every 50 months. Most recently, Discord4 was updated on November 11, 2026 and JMP Pro on November 5, 2026.

Other comparisons