Comparison

iStem vs J.J.Moon AUv3 Plugin

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

Head to head
About

iStem

Features
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iStem lets you split songs into drums, bass, vocals, and other instruments, remix them, and practice with tempo/pitch/metronome controls. Features: - Split in instrument/vocal tracks - Detect beats - Count-in function - Speed up or slow down songs - Change pitch - Set up loops for detailed practice - No login or user data required - All computation is done on the device - Export to file

About

J.J.Moon AUv3 Plugin

Enhance your acoustic guitar sound with this AUv3 plugin. It offers detailed control over body, air, and string tones, plus compression, stereo width, and spatial effects. Try it free for seven days before a one-time purchase unlocks all features permanently.

Highlights
  • Acoustic guitar curve engine
  • Multi-band EQ shaping
  • Optical compressor
  • Stereo micro-pitch widening
  • Short stereo double and room bloom
  • Fifteen factory presets
  • Customizable panel finishes
Features
Read full description

Body, air, and string detail — the shape of a well-mic'd acoustic, without a rack of EQ. jj-moon is an acoustic-guitar curve engine in a single AUv3 insert. Four blocks in signal order, each with its own on/off, plus a master strip. SHAPE — A fixed multi-band target aimed at great acoustic recordings: rumble out, body in, boxiness out, soft mid dip, string presence, air on top. Three voices — Steel, Nylon, Flamenco — share the same knobs. One Curve amount for how far you go, Wood for body vs sparkle, Presence for the strings. This is the block the whole plug-in is built around. COMP — An optical compressor with program-dependent release. Soft by design for acoustic dynamics. One Comp knob for threshold, ratio and make-up together, plus Attack and Release. A gain-reduction meter shows what it is doing. WIDTH — Stereo micro-pitch and short delay (the same family of trick as a classic microshifter), with a Focus crossover so the body stays centred while the highs open up. SPACE — A short stereo double with gentle flutter, into a soft acoustic room bloom. Not a spring tank — just a little air around the instrument. FIFTEEN FACTORY PRESETS Default, Fallen Leaf, Fingerstyle, Piezo Soft, Stereo Porch, Close Mic, Moon Room, Strum, Curve Only, Nylon, Concert Hall, Spanish Soft, Flamenco, Rasgueado, Soleá. Save your own from the preset window; swipe left to rename or delete. WORKS WHERE YOU WORK An Audio Unit v3 effect: GarageBand, Logic for iPad, AUM, Cubasis, BeatMaker, and any other AUv3 host. The included app is a working player — six acoustic demo parts are bundled (steel + nylon), or run your own playing through the microphone. The panel is drawn procedurally rather than assembled from bitmaps, so it stays sharp at whatever size your host gives it, on a phone or a 13-inch iPad. Moonlight, Slate, Field Green, or Tweed finishes. FREE TO TRY Seven days free from first launch. No account, no signup, no subscription. After that, one purchase unlocks it permanently on all your devices. If you do not buy it, the editor keeps working and audio passes through dry — nothing you built disappears. jj-moon is an original effect. Preset names point at a feel or a place. It is not affiliated with, endorsed by, or associated with any artist, label, or other plug-in maker, and does not recreate any particular recording.

Screenshots

iStem4 screens
J.J.Moon AUv3 Plugin3 screens

Verdict

The call

iStem and J.J.Moon AUv3 Plugin are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both are free to download. iStem sells 1 one-off in-app purchase and J.J.Moon AUv3 Plugin sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ScorecardNo meaningful differences
iStem versus J.J.Moon AUv3 Plugin: the parameters behind the verdict, then further details
ParameteriStemJ.J.Moon AUv3 Plugin
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequency—Weekly
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size79 MB8 MB
Age rating4++4
DeveloperJan MaesPetar Gerov

In-app purchases

1 purchases

iStem

One-time1
  • iStem Activation$4.99
1 purchases

J.J.Moon AUv3 Plugin

One-time1
  • jj-moon Unlock$2.99

Questions

Is iStem free?
iStem is free to download, with in-app purchases available.
Is J.J.Moon AUv3 Plugin free?
J.J.Moon AUv3 Plugin is free to download, with in-app purchases available.
Do iStem or J.J.Moon AUv3 Plugin have ads?
Neither iStem nor J.J.Moon AUv3 Plugin shows ads.

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