Comparison

TestTone vs Roxsyn Guitar Synthesizer

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

Head to head
About

TestTone

Features
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This test signal generator is ideal for checking audio equipment and confirming audible frequency ranges.It can play sine, triangle, sawtooth, and square waves from 20 Hz to 20 kHz, as well as white noise and pink noise. Features • You can switch between preset frequencies, white noise, and pink noise using the frequency preset buttons. You can also tap the frequency display area to enter any desired frequency manually. The frequency can also be adjusted using the left/right buttons or by tapping the frequency display. • Supports switching between sine, triangle, sawtooth, and square waveforms. • Playback starts or stops by tapping the ON/OFF button or the icon at the top. Note Playing at high volumes may cause hearing damage or damage to your audio equipment. Please use with caution.

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
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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.

Screenshots

TestTone1 screens
Roxsyn Guitar Synthesizer4 screens

Verdict

The call

The clearest difference is price: TestTone at $1.99 against Roxsyn Guitar Synthesizer's $19.99. On update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

TestTone costs $1.99 and Roxsyn Guitar Synthesizer $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

TestTone ships an update every 5 months, Roxsyn Guitar Synthesizer every 9 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard1 real difference · 9 level
TestTone versus Roxsyn Guitar Synthesizer: the parameters behind the verdict, then further details
ParameterTestToneRoxsyn Guitar Synthesizer
Price$1.99 — better$19.99
Rating—4.7 (90 ratings) — better
Positive reviews—72.1% of reviews
Number of ratings—90 — better
Update frequencyEvery 5 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.6
Further details — not scored
Size8 MB32 MB
Age rating4+4+
DeveloperHTLabYonac Inc.

In-app purchases

None

TestTone

No in-app purchases

None

Roxsyn Guitar Synthesizer

No in-app purchases

Questions

Is TestTone free?
TestTone costs $1.99, with no in-app purchases.
Is Roxsyn Guitar Synthesizer free?
Roxsyn Guitar Synthesizer costs $19.99, with no in-app purchases.
Do TestTone or Roxsyn Guitar Synthesizer have ads?
Neither TestTone nor Roxsyn Guitar Synthesizer shows ads.
Which is updated more often, TestTone or Roxsyn Guitar Synthesizer?
TestTone ships an update every 5 months, and Roxsyn Guitar Synthesizer every 9 months. Most recently, TestTone was updated on October 27, 2026 and Roxsyn Guitar Synthesizer on October 24, 2026.

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