sumFX vs MORF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
MORF
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Your voice. A different character. MORF is an ivlt.io Gadget for exploring live voice and sound transformation on iPhone and iPad. Choose a sound, set your input level and shape the result with controls made for playing. Two Audio Unit (AUv3) plugins bring MORF into your host app. SHAPE YOUR SOUND Adjust pitch and blend your original input with the transformed sound. Open the shaping controls for tone, body, drive, space, movement and formant. Map real-time controls to a MIDI controller with MIDI learn. CHOOSE YOUR TRADE-OFF Choose from the processing modes available for each model. Faster response and greater detail make different demands on your device. Estimated delay ranges help you decide; actual latency also depends on the model, device and audio connection. Not every model supports every mode. USE MORF IN YOUR HOST APP MORF includes two AUv3 effects, with no separate purchase or download. ivlT: MORF is for live use: monitoring and playing through it with headphones. It runs the Fast engine, plays the sounds that have a Fast version and reports about 41 ms of latency to the host. ivlT: MORF Studio is for recorded tracks and exports. It runs Standard or High Quality and plays every sound in your library. It reports about 0.81 s (Standard) or 1.01 s (High Quality), so it is not for live monitoring. The host's delay compensation lines up the converted track on playback and in exports, and exports render offline. Both plugins use the sounds in your MORF library; add new sounds in the app and they appear in the plugins automatically. Pitch, Mix, Input, Gate, Output and the shaping dials are host parameters, so hosts can automate them. An input-keyed gate mutes the converted voice while your input is quiet; some sounds would otherwise turn room noise into artifacts. The plugins process audio on your device and make no network requests. Use one MORF Studio per host session; live MORF instances can run alongside. Latency figures are what the plugins report to the host at 48 kHz with 256-frame buffers, not microphone-to-speaker measurements. The plugins are tested on iPad in AUM and GarageBand; other hosts and iPhone are not yet tested. BUILD YOUR LIBRARY Start offline with Clara, Cello, Violin, Bird, Whale and Storm, included in the app. Preview optional sound packs before downloading. Import compatible models saved in Files. Download external models separately in your browser and transfer them to your device before importing. Supported imports include RVC v2 pitch-conditioned models at 32, 40 and 48 kHz; arbitrary AI models are not compatible. Create personal sounds from recordings on your device. Organise your library with drag and drop, and remove downloaded models when you no longer need them. PROCESS ON YOUR DEVICE Audio transformation runs locally. Microphone audio is not uploaded for cloud processing. Internet access is needed for the ivlt catalogue and downloads; installed sounds can be used offline. Optional downloads require additional storage. PLAY RESPONSIBLY Use recordings and voice models only with the permissions and licences you need. Do not impersonate others or mislead listeners. A model being publicly downloadable does not mean it is cleared for commercial use. For live monitoring, use headphones or a suitable audio interface to avoid feedback. Wired audio is recommended; Bluetooth adds delay. Sound quality varies with the source, model and processing mode. MORF is a creative sound tool, not a guarantee of an indistinguishable voice replica. Learn more: https://ivlt.io/products/morf Quick start: https://ivlt.io/guides/morf-quickstart Privacy: https://ivlt.io/legal/privacy/morf
Screenshots
Verdict
The clearest difference is update cadence: MORF at every 2 weeks against sumFX's every 6 months. sumFX's advantage is iOS requirement (12.0 vs 18.0). On price, ads, in-app purchases 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
sumFX costs $9.99 and MORF $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
sumFX ships an update every 6 months, MORF every 2 weeks. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.
| Parameter | sumFX | MORF |
|---|---|---|
| Price | $9.99 | $9.99 |
| Rating | 4.4 (12 ratings) — better | — |
| Positive reviews | 54.5% of reviews | — |
| Number of ratings | 12 — better | — |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 44 MB | 2.0 GB |
| Age rating | 4+ | 4+ |
| Developer | OSC Audio | Michael Ivertowski |
In-app purchases
sumFX
No in-app purchases
MORF
No in-app purchases









