Comparison

iFX Rack vs sumFX

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

Head to head
About

iFX Rack

This app offers a virtual analog effects rack for iOS devices, featuring meticulously modeled vintage analog processors. It includes a suite of classic effects and allows for flexible FX chain assignment and MIDI automation.

Highlights
  • Analog modeled virtual effects rack
  • Vintage analog circuit modeling
  • AUv3 support
  • MIDI learnable automation
  • Dynamically drag-able FX chain
  • Includes VKFX effects suite
Features
Read full description

• NEW TalkBox® Effect • NEW CloudVerb (Creatomspheric Reverb) • NEW PhatFilt Filter FX • NEW iFX AMP FX ***New FX Modules not included with ALL FX Expansion iFX Rack is an analog modeled virtual effects rack for your iOS Device. In partnership with Overloud™, we have licensed the, ever so popular VKFX™ effects suite, which is included in the initial purchase. The VKFX suite is a meticulously modeled vintage analog effect processor, which aims to recreate classic vintage hardware using actual analog circuit modeling. It has been the most beloved effects suite ever created for the desktop and our iFX Rack is providing the same exact effects to you along with a recreation of the original factory presets. iFX Rack is your all encompassing effects rack with all of the virtual effects you need in one app. Here is what is included in the initial purchase: 1. Preamp with Two band EQ 2. Stereo Auto-Pan 3. Analog Chorus 4. Tube Amplifier with Three Band EQ 5. Spring Reverb 6. Envelope and Dynamic Filter Wah 7. Opto-Compressor 8. Phase Shifter 9. Overdrive 10. Multi-Tap Tape Delay with Multiple Modes Highlights ▪ AUv3 ▪ 93 Factory Presets from VKFX Library Ported Over ▪ MIDI Learnable Automation ▪ Modulation FX Syncable ▪ Dynamically Drag-able FX Chain Slot Assignment ▪ Highly CPU Efficient coding ▪ Flexible Preset Management with Favorite Options The 17 IAPs below can be purchased as a complete package or individually: ▪ Master Limiter with Soft Clipping and Tube Saturation ▪ 11-Band EQ ▪ SUB Harm - Sub frequency modulator/enhancer ▪ AMP Combo and Speaker Simulation ▪ Degrade - Sample Quality Bit Reduction ▪ Detune - Pitch Shifter Thickener ▪ Rotar - Rotary Speaker/Leslie simulation with physical modeled parameters ▪ DimenD - Dimension D Chorus emulation ▪ DISTORTIT - Nasty Distortion unit ▪ Stereo Widener Chorus - Turns any mono sound into a stereo with slight warm chorusing ▪ ST Widener Enhancer - Enhance stereo signals with Safe Bass frequency option to keep mono and two spread modes ▪ Amp Sim - A convolution IR with popular AMP Simulations ▪ FVerb - Schroeder Algorithmic Reverb ▪ MVerb - Dattorro's figure-of-eight Algorithmic Reverb ▪ Spring Reverb - Rare and vintage spring reverbs ▪ Flanger - Warm Flanger effect ▪ FantasyVerb - A convolution reverb containing iconic spaces and analog reverbs such as: **All other future FX will not be included in the 17 FX Bundle. You will Need to purchase them separately. --------- Terms and Privacy Notices: • EULA Terms of use - https://gospelmusicians.com/EULA.html • Privacy Policy - https://gospelmusicians.com/privacy-policy.html • Terms and Conditions - https://gospelmusicians.com/terms-conditions.html

About

sumFX

This app is a versatile audio effects processor for musicians. It offers a modular design with multiple high-quality FX modules and customizable slots, allowing for quick creation of unique sounds. Focus on your music with intuitive controls and visual feedback.

Highlights
  • Modular multi-FX processor
  • 8 high-quality FX modules
  • 8 FX slots with Wet/Dry control
  • 2 LFOs per slot
  • 50+ cross-platform presets
  • Pre/post waveform view
Features
Read full description

sumFX is a modular multi-FX processor for Mac/PC and iOS. Designed with simplicity in mind, to help keep you focused on the music and the sum of your efforts. Packed with 8 high quality FX modules and an available 8 slots, each loaded with Wet/Dry control, Global Wet/Dry, and 2 LFOs per slot, creating new unique sounds is quick and easy. 50+ cross-platform slot & chain presets are included to get you to any sound you need quickly and we’ve packed in an easy to use pre/post waveform view to help keep you focused on the result of your FX. Modules: -syncDynamics - Multimode dynamic FX with BPM sync attack/release (Noise Gate, Expander, Compressor, Limiter) -stereoFilter - Stereo filter with link or individual channel controls (LPF12, HPF12, BPF12, LPF24, HPF24, BPF24, Notch, & Formant options). -variMod - Multimode modulation FX with stereo offset (Chorus, Flanger,  Vibrato, Phaser, Tremolo,  & Auto Pan) -EQuator - Full high quality EQ module (3 Parametric Bands, High/Low Shelf, & HPF/LPF). -frostReverb - Multi-Mode (Original, Plate, Spring, Room) Stereo Reverb.  -bucketDelay - Stereo Analog Style Delay with individual channel control. -variPitch - Stereo Pitch Shifter with 3X Modes (Doubler, Harmonizer, & Full Control) -powerPhase - Multimode Saturation, Utility Gain In/Out, Mono Maker, Channel msDelay, & Phase inverter.

Screenshots

iFX Rack4 screens
sumFX3 screens

Verdict

The call

The clearest difference is rating: sumFX at 4.4 against iFX Rack's 3.8. sumFX also leads on in-app purchases (none vs 20). iFX Rack's advantage is update cadence (monthly vs every 6 months) and review sentiment (70% vs 55%). On price, ratings volume, ads 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

iFX Rack costs $9.99 and sumFX $9.99 up front. iFX Rack sells 20 one-off in-app purchases. sumFX asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

sumFX holds the better App Store score, 4.4 against 3.8. Both are backed by a comparable volume of ratings — 10 and 12 respectively. Written reviews complicate that: 70% of iFX Rack's written reviews are positive against 55% of sumFX's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iFX Rack ships an update monthly, sumFX every 6 months. The most recent releases landed on August 30, 2026 and September 7, 2026 respectively.

Scorecard5 real differences · 5 level
iFX Rack versus sumFX: the parameters behind the verdict, then further details
ParameteriFX RacksumFX
Price$9.99$9.99
Rating3.8 (10 ratings)4.4 (12 ratings) — better
Positive reviews69.6% of reviews — better54.5% of reviews
Number of ratings1012 — better
Update frequencyMonthly — betterEvery 6 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size279 MB44 MB
Age rating4+4+
DeveloperMIDIculous LLCOSC Audio

Customer experience

iFX Rack

All ratings10 ratings
Positive70.0%
Neutral0.0%
Negative30.0%
Written reviews23 reviews
Positive69.6%
Neutral8.7%
Negative21.7%

sumFX

All ratings12 ratings
Positive83.3%
Neutral8.3%
Negative8.3%
Written reviews11 reviews
Positive54.5%
Neutral18.2%
Negative27.3%

In-app purchases

20 purchases

iFX Rack

One-time20
  • Distortit$0.99
  • Spring Reverb$0.99
  • Flanger$0.99
Show 17 more
  • Amp Combo$1.99
  • SUB Harm$1.99
  • Amp Sim$2.99
  • DimenD Chorus$2.99
  • Detune$2.99
  • FantasyVerb$3.99
  • 11 Band EQ$3.99
  • ST Widener Enhancer$3.99
  • iFX Amp$3.99
  • PhatFilt$3.99
  • Talkbox® Effect$3.99
  • Rotar$4.99
  • Master Limiter$4.99
  • IMPULSation for iFX Rack$6.99
  • Phick Analog Thickener$6.99
  • Additional Effects Bundle$7.99
  • CloudVerb$9.99
None

sumFX

No in-app purchases

Questions

Is iFX Rack free?
iFX Rack costs $9.99, and also offers in-app purchases.
Is sumFX free?
sumFX costs $9.99, with no in-app purchases.
Which has better reviews, iFX Rack or sumFX?
sumFX is rated higher. iFX Rack averages 3.8 out of 5 from 10 ratings, while sumFX averages 4.4 from 12 ratings.
Do iFX Rack or sumFX have ads?
Neither iFX Rack nor sumFX shows ads.
Which is updated more often, iFX Rack or sumFX?
iFX Rack ships an update monthly, and sumFX every 6 months. Most recently, iFX Rack was updated on August 30, 2026 and sumFX on September 7, 2026.

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