Comparison

Roxsyn Guitar Synthesizer vs IR Loader

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

Head to head
About

Roxsyn Guitar Synthesizer

Transform your guitar or bass into a powerful, expressive polyphonic synthesizer without MIDI. This app synthesizes your instrument directly, capturing every nuance of your playing for rich, responsive synth sounds. No special pickups or hardware needed, just connect to your audio interface.

Highlights
  • Direct guitar synthesis (no MIDI)
  • Metamorphic signal generators (oscillators)
  • Dual filter banks with custom virtual-analog filters
  • Guitar-optimized envelopes with adjustable triggers
  • Powerful arpeggiator with multiple algorithms
  • Modulation matrix for parameter control
Read full description

Introducing a revolutionary new way to turn your guitar or bass into a fully featured polyphonic synth: Roxsyn, the world’s first metamorphic guitar synthesizer. Expressive, fast and responsive to every nuance, it is a league apart from all other guitar synths to date. Unhappy with cold and temperamental guitar-to-MIDI synths that dominate the market, we developed a completely new approach to guitar synthesis. Our all-original technology synthesizes your guitar directly, without the use of MIDI notes. Rescued from being a poor keyboard substitute, your guitar suddenly becomes an integral part of the synth. It's alive! There is no pitch tracking involved. There are no pitch estimation errors, octave glitches, or garbled chords. There is no over-complicated G2M between your guitar and synth to destroy everything human about your playing. Instead, Roxsyn’s metamorphic sound generation technology retains all the personality of your sound: vibrato, slides, bends, dynamics, even extended technique. The result is a polyphonic synthesizer that is as fast and accurate as it is richly expressive. No need for special MIDI pickups or hardware, either: just plug into your favorite Lightning/USB audio interface, and start synthing! ::Powerful Synth Engine:: Roxsyn’s big synth heart is its three metamorphic signal generators (AKA oscillators). Each generator offers 5 unique waveforms, and has a 4+ octave range to cover a wide spectrum of frequencies. They also feature stereo panning, and can route into either of Roxsyn’s dual filter banks. You can even dial in your guitar directly into the synth engine for even bigger sounds. ::Dual Filter Banks:: Each containing four custom virtual-analog filter types and dedicated envelopes, the filter banks help sculpt the synth generators in countless new ways. The envelopes are specially designed for the guitar, and are driven by a fully adjustable automatic trigger generator controlled by your playing dynamics. Envelopes offer original features like finite-duration sustain stages, as well as the ability to receive or ignore trigger-off messages. They can also be triggered externally via MIDI controllers like an expression pedal. An additonal envelope controls the amplitude of the signal, giving you even more options in creating synth sounds. ::Arpeggiator:: Instantly transform sustained guitar notes into fast (or slow), complex patterns with Roxsyn’s powerful yet easy to use arp. There are 8 stepping algorithms to choose from, as well as settable note value, swing, and note repeats. You can even route the arp to any combination of the 3 voice generators — enabling you to layer a non-arpeggiated sound with an arp pattern. What's more, the arp can send trigger signals into any of Roxsyn’s 4 envelopes, and even reset the LFOs. So it’s also a handy rhythmic / trance tool as well! ::Modulation & FX:: Roxsyn’s user friendly modulation matrix lets you manipulate parameters (pitch, amplitude, filters, etc) using its two LFOs and mod envelope. Add subtle vibrato, even glide simulation, or go full-on berserk. LFOs each have 9 waveforms, and feature beat syncing. Each matrix row can take LFOs or the mod envelope as a modulator or control, and can even use external control sources. And if you like your synths on the spicy side, Roxsyn comes with top-notch stereo FX specially developed to evoke extra synthiness: Powerful algorithmic reverb with the sound of countless rooms, phasing, modulating, 2-channel delay, and graphic EQ. ::Pro Features:: 500+ factory presets with bass, lead, pad, arp sounds & more. Easily create & share your own presets. Audio Unit v3, Ableton Link. Native 64-bit processing at up to 96kHz. 160+ MIDI controllable parameters; MIDI learn & map save/share; tapedeck (in the standalone app), so you can record, loop & share your ideas on the go, and many more handy features.

About

IR Loader

Load and shape your cabinet impulse responses with integrated EQ, compression, and a bass enhancer. This tool supports multiple IRs simultaneously and offers a power amplifier model for detailed tone control.

Highlights
  • Load multiple cabinet IR files
  • 6-band parametric equalizer
  • Custom console-style compressor
  • Bass Enhancer for low-end shaping
  • Class AB push-pull EL34 tube amplifier model
  • Standalone, AUv3, and IAA support
Features
Read full description

The Nembrini Audio IR Loader is an innovative and comprehensive impulse response loader designed to load your favorite cabinet IRs. The IR Loader allows you to load a single IR and shape your tone using integrated processing tools, including a 6-band parametric equalizer and a custom console-style compressor. The Bass Enhancer makes the Nembrini Audio IR Loader an ideal tool for managing and shaping both guitar and bass cabinet IRs. The integrated browser lets you quickly navigate your IR library and load impulse responses without interrupting your workflow. POWER AMPLIFIER Power amplifier modeled after a Class AB push-pull EL34 tube amplifier, featuring three selectable negative feedback modes. COMPRESSION Custom-designed console compressor with a sidechain high-pass filter. BASS ENHANCER Bass Enhancer inspired by the Little Labs Voice Of God* design, delivering focused low-end weight. Provides more than 24 dB of low-frequency boost. Frequencies below the selected threshold are attenuated to keep the enhanced low end tight and controlled. EQUALIZER 6-band parametric equalizer with real-time spectrum analyzer. Delivers precise and detailed control for cabinet tone shaping. Works as a standalone application, AudioUnit v3 effect, or Inter-App Audio effect.

Screenshots

Roxsyn Guitar Synthesizer4 screens
IR Loader3 screens

Verdict

The call

The clearest difference is price: IR Loader at $7.99 against Roxsyn Guitar Synthesizer's $19.99. IR Loader also leads on update cadence (every 5 weeks vs every 9 months). Roxsyn Guitar Synthesizer's advantage is rating (4.7 vs 4.1) and review sentiment (72% vs 50%). On ads, in-app purchases, monetization model 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

Roxsyn Guitar Synthesizer costs $19.99 and IR Loader $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Roxsyn Guitar Synthesizer holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Roxsyn Guitar Synthesizer has 90 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 72% of Roxsyn Guitar Synthesizer's written reviews are positive against 50% of IR Loader's.

UpkeepUpdate frequency

Roxsyn Guitar Synthesizer ships an update every 9 months, IR Loader every 5 weeks. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

Scorecard5 real differences · 5 level
Roxsyn Guitar Synthesizer versus IR Loader: the parameters behind the verdict, then further details
ParameterRoxsyn Guitar SynthesizerIR Loader
Price$19.99$7.99 — better
Rating4.7 (90 ratings) — better4.1 (9 ratings)
Positive reviews72.1% of reviews — better50.0% of reviews
Number of ratings90 — better9
Update frequencyEvery 9 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615 — better
Further details — not scored
Size32 MB38 MB
Age rating4+4+
DeveloperYonac Inc.Nembrini Audio

Customer experience

Roxsyn Guitar Synthesizer

All ratings90 ratings
Positive92.2%
Neutral3.3%
Negative4.4%
Written reviews61 reviews
Positive72.1%
Neutral9.8%
Negative18.0%

IR Loader

All ratings9 ratings
Positive77.8%
Neutral0.0%
Negative22.2%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Roxsyn Guitar Synthesizer

No in-app purchases

None

IR Loader

No in-app purchases

Questions

Is Roxsyn Guitar Synthesizer free?
Roxsyn Guitar Synthesizer costs $19.99, with no in-app purchases.
Is IR Loader free?
IR Loader costs $7.99, with no in-app purchases.
Which has better reviews, Roxsyn Guitar Synthesizer or IR Loader?
Roxsyn Guitar Synthesizer is rated higher. Roxsyn Guitar Synthesizer averages 4.7 out of 5 from 90 ratings, while IR Loader averages 4.1 from 9 ratings.
Do Roxsyn Guitar Synthesizer or IR Loader have ads?
Neither Roxsyn Guitar Synthesizer nor IR Loader shows ads.
Which is updated more often, Roxsyn Guitar Synthesizer or IR Loader?
Roxsyn Guitar Synthesizer ships an update every 9 months, and IR Loader every 5 weeks. Most recently, Roxsyn Guitar Synthesizer was updated on November 3, 2026 and IR Loader on November 8, 2026.

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