Comparison

Sentium Glitch vs SL Echo

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

Head to head
About

Sentium Glitch

Create complex, animated electronic instruments using four distinct synthesis engines. Blend subtractive, FM, Karplus-Strong, and wavetable layers with extensive modulation options. Save and recall patches with iCloud sync for a comprehensive sound design experience.

Highlights
  • Four distinct synthesis engines
  • Layered sound design
  • Extensive modulation routing
  • XY pad recording
  • AUv3 and standalone app
  • Factory and user presets
  • iCloud sync for presets
Read full description

Build animated electronic instruments from four synthesis engines. Blend Subtractive, FM, Karplus-Strong, and Wavetable layers. Sentium Glitch is a stereo AUv3 synthesizer for producers, composers, and sound designers who want layered motion inside one focused instrument. Use it in compatible AUv3 instrument hosts, or open the standalone app on iPhone, iPad, Mac, and Apple Vision Pro to load the same experience, connect MIDI inputs, and play it as a standalone instrument. Every patch is a complete sound design document: four engine layers, per-layer envelopes, filters, LFOs, modulation routes, pan, level, engine bypass, master effects, polyphony budgeting, voice mode and glide, and optional recorded XY Pad motion all recallable through presets and AU host project state. Core sound engines: - Subtractive: dual oscillators, sub, noise, detune, pulse-width shaping, and multimode filtering for classic analog weight and layered fundamentals. - FM: five operator topologies for bells, keys, metallic basses, and aggressive digital color: two-operator, blended two-operator, stacked, dual-modulator, and split-carrier. - Karplus-Strong: plucked and struck delay-line resonators for guitars, kotos, mallets, metallic attacks, and hybrid acoustic-electric textures. - Wavetable: curated morphing tables with vocal formants, digital edges, harmonic motion, seeded-random spectra, and unison width for animated modern tones. Performance and modulation: - Poly, mono, and legato voice modes with adjustable glide (portamento) for tight monophonic basses and expressive, gliding leads. - Two XY pads with four routable axes. - Record XY pad motion per engine and save it with the patch. - Route LFOs, envelopes, velocity, aftertouch, pitch bend, mod wheel, CC74, and XY pad axes to musical targets. - Move oscillator pitch and mix, FM index and ratios, Karplus brightness and decay, wavetable position and detune, filter, pan, gain, LFO rates, and master-FX controls. - Sync LFOs, chorus rate, and delay time to host tempo when available. Patch and mix tools: - Four-layer engine mixer for balancing, panning, and bypassing each sound source. - Master chorus, delay, reverb, level, and soft clip. - Global polyphony budget up to 32 voices with device-aware runtime limits. - Stereo output at 44.1, 48, and 96 kHz sample rates where supported. - On-screen keyboard with pitch and modulation wheels, plus CoreMIDI input management in the standalone app. Factory and user library: Start from 92 factory presets spanning signature motion patches, classic synth tones, basses, leads, keys, bells, plucks, strings, pads, rhythmic textures, atmospheres, experimental sounds, and technical references. Save your own user presets locally with iCloud sync when available. Export selected saved user presets as .sgpresets files and import them through a preview workflow that appends new user presets without overwriting the existing library. Sentium Glitch is built for sounds that move: evolving pads, unstable digital bells, hybrid plucks, animated basses, cinematic sweeps, mono leads that glide between notes, and expressive performance patches that respond to your hands.

About

SL Echo

This audio effect app provides animated delay and space for musical decisions on iPad. Easily adjust time, feedback, and tone for various repeat styles, while maintaining a clear dry signal with stereo width and ducking. It supports AUv3 integration with popular music hosts.

Highlights
  • Animated delay and space effects
  • Adjustable time and feedback
  • Tone shaping controls
  • Stereo width and ducking
  • AUv3 support
  • Standalone preview mode
  • Factory and user presets
Features
Read full description

SL Echo is a focused AUv3 delay effect designed for fast musical decisions on iPad. Move from a close vocal pocket to wide, evolving repeats without navigating complex pages. • Time and feedback for slapback or long trails • Tone shaping for darker or brighter repeats • Stereo width and ducking for a clear dry signal • Factory presets and local user presets • AUv3 support for compatible iPad music hosts Works as a standalone preview app and as an AUv3 effect in GarageBand, AUM, Cubasis, BeatMaker 3 and other compatible hosts.

Screenshots

Sentium Glitch4 screens
SL Echo3 screens

Verdict

The call

The clearest difference is price: SL Echo at $6.99 against Sentium Glitch's $29.99. SL Echo also leads on iOS requirement (15.0 vs 17.0). Sentium Glitch's advantage is ratings volume (4 vs 1). On rating, update cadence, ads and in-app purchases 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

Sentium Glitch costs $29.99 and SL Echo $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Sentium Glitch against 5.0 for SL Echo. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

Sentium Glitch ships an update every 2 weeks, SL Echo weekly. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
Sentium Glitch versus SL Echo: the parameters behind the verdict, then further details
ParameterSentium GlitchSL Echo
Price$29.99$6.99 — better
Rating5.0 (4 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 2 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, Mac, Vision Pro — betteriPhone, iPad, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size14 MB18 MB
Age rating4+4+
DeveloperChristian ThompsonVIACHESLAV ZHILTSOV

Customer experience

Sentium Glitch

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SL Echo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sentium Glitch

No in-app purchases

None

SL Echo

No in-app purchases

Questions

Is Sentium Glitch free?
Sentium Glitch costs $29.99, with no in-app purchases.
Is SL Echo free?
SL Echo costs $6.99, with no in-app purchases.
Which has better reviews, Sentium Glitch or SL Echo?
Sentium Glitch and SL Echo are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.
Do Sentium Glitch or SL Echo have ads?
Neither Sentium Glitch nor SL Echo shows ads.
Which is updated more often, Sentium Glitch or SL Echo?
Sentium Glitch ships an update every 2 weeks, and SL Echo weekly. Most recently, Sentium Glitch was updated on October 17, 2026 and SL Echo on October 16, 2026.

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