Comparison

SlowMoFX vs Goniometer for Logic Pro

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

Head to head
About

SlowMoFX

This audio effect plugin allows users to seamlessly blend incoming audio with a slowed-down version, creating unique half-speed effects. It offers adjustable slowdown speeds, filtering, and built-in effects like delay and reverb for sound manipulation.

Highlights
  • Half-speed audio effect
  • Adjustable slowdown speeds (1.5x, 2x, 4x)
  • Low and high pass filters
  • Built-in delay and reverb
  • Ping Pong and Reverse modes
  • MIDI automation support
Features
Read full description

SlowMoFX is an AUv3 plugin that allows you to seemlessly mix incoming audio with a slowed down version in perfect sync with the current tempo. This allows you to obtain that sort after half speed effect that is used by many famous DJ's around the world. You can dropout the original audio completely to create dark downtempo atmospheric versions of a song and slowly and seemlessly return to the original mix. This is great for drums and percussive rythms. Lead instruments with sharp attacks when slowed down give those distinctive trap melodies and booming basses. Simply press the POWER button to turn on the effect. It will smoothly transition to a mix of the original and a slow halftime version. Selecting the 4x option will slow down to quad time making the mood even darker, while the 1.5x can be used to generate triplets and syncopated beats. The low and high pass filters can be used to determine how much of the input is effected, while the mix knob controls the depth of the effect. The Glide button enables a smooth glide from the none effected pitch to the destination pitch for those slow down and speed up type effects. A ping pong mode also allows you to alternate between forwards and reverse play while the reverse mode creates long soothing syncapated textures. SlowMoFX also sports a number of built in effects that can be enabled in order to create smooth transitions such as delay and reverb, while the EQ, drive, phaser, pan and pitch effects allow you to add flavour to the sound. If running under a DAW such as AUM that allows multiple output busses you can route the effected signal through your favourite external effects. Features: • Paramter and MIDI automation of main controls. • Filtering of input using LP / HP filters. • Built in EQ, Phaser, Pan, Delay, Reverb, Drive and Pitch effects. • Fade In/Out controls. • Ping Pong and Reverse modes. • Supports buffer sizes from 1-16 beats • 2x, 4x and 1.5x slow down supported. • External Effects loop in supported apps. • Includes comprehensive Help.

About

Goniometer for Logic Pro

This audio analysis tool visualizes the stereo image of sound recordings. It helps users analyze and adjust stereo width, balance, and phase relationships by displaying channel information.

Highlights
  • Stereo image analysis
  • Mid-Side (MS) and Left-Right (LR) channel display
  • Relative level and phase relationship visualization
  • Mono sum and channel difference analysis
  • Syncs with host app waveforms
  • GPU-accelerated waveform rendering
Read full description

An audio goniometer is a tool used to measure and analyze the stereo image of a sound recording. It typically allows the user to switch between Mid-Side (MS) and Left-Right (LR) channels, and can display the relative levels and phase relationships between them. The Mid channel represents the mono sum of the Left and Right channels, while the Side channel represents the difference between them. This allows for precise adjustments to the stereo width and balance of a mix, as well as the ability to convert between MS and LR formats. Is compatible with all the Host apps that support Audio Unit like Garage Band, Auria, AOM, Cubasis and much more. It syncs with your host app so that the waveforms will be in sync per beats or fractions. Built on Metal Framework use the GPU to render the waveform so is super light on CPU for processing audio.

Screenshots

SlowMoFX4 screens
Goniometer for Logic Pro3 screens

Verdict

The call

The clearest difference is review sentiment: SlowMoFX at 70% against Goniometer for Logic Pro's 25%. SlowMoFX also leads on update cadence (every 6 days vs every 3 months) and ratings volume (14 vs 2). Goniometer for Logic Pro's advantage is price (Free vs $9.99) and rating (5.0 vs 3.8). On ads, in-app purchases, device support and iOS requirement 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

Goniometer for Logic Pro is free to download; SlowMoFX costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Goniometer for Logic Pro holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: SlowMoFX has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 70% of SlowMoFX's written reviews are positive against 25% of Goniometer for Logic Pro's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

SlowMoFX ships an update every 6 days, Goniometer for Logic Pro every 3 months. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

Scorecard6 real differences · 4 level
SlowMoFX versus Goniometer for Logic Pro: the parameters behind the verdict, then further details
ParameterSlowMoFXGoniometer for Logic Pro
Price$9.99Free — better
Rating3.8 (14 ratings)5.0 (2 ratings) — better
Positive reviews70.0% of reviews — better25.0% of reviews
Number of ratings14 — better2
Update frequencyEvery 6 days — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS13 — better14.0
Further details — not scored
Size12 MB8 MB
Age rating4+4+
Developer4Pockets.comIndigogo

Customer experience

SlowMoFX

All ratings13 ratings
Positive61.5%
Neutral15.4%
Negative23.1%
Written reviews10 reviews
Positive70.0%
Neutral10.0%
Negative20.0%

Goniometer for Logic Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

In-app purchases

None

SlowMoFX

No in-app purchases

None

Goniometer for Logic Pro

No in-app purchases

Questions

Is SlowMoFX free?
SlowMoFX costs $9.99, with no in-app purchases.
Is Goniometer for Logic Pro free?
Goniometer for Logic Pro is free to download, with no in-app purchases.
Which has better reviews, SlowMoFX or Goniometer for Logic Pro?
Goniometer for Logic Pro is rated higher. SlowMoFX averages 3.8 out of 5 from 14 ratings, while Goniometer for Logic Pro averages 5.0 from 2 ratings.
Do SlowMoFX or Goniometer for Logic Pro have ads?
Neither SlowMoFX nor Goniometer for Logic Pro shows ads.
Which is updated more often, SlowMoFX or Goniometer for Logic Pro?
SlowMoFX ships an update every 6 days, and Goniometer for Logic Pro every 3 months. Most recently, SlowMoFX was updated on October 20, 2026 and Goniometer for Logic Pro on October 22, 2026.