Comparison

Multiple Tone Generator vs Viking Synth

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

Head to head
About

Multiple Tone Generator

Generate multiple audio signals with adjustable waveforms, frequencies, and volumes for each channel. Offers presets for guitar and bass tuning, with options to expand channel support.

Highlights
  • Multiple audio channels
  • Adjustable waveforms (Sine, Triangle, Squire, Saw)
  • Precise frequency control (20Hz - 20000Hz)
  • Individual channel volume and mute
  • Logarithmic frequency sliders
  • Guitar and bass tuning presets
Read full description

This app generates the audio signal of multiple channels. Supports 6 audio channels by default, upgradeable to 16 via in-app purchase. [ Wave type ] - There are four types of waveform. (Sine, Triangle, Squire, Saw) - It can switch to the four types of each waveform by the wave type button. - It can be set for each channel. - It can change summarizes the waveforms of all channels with the bottom of the button. [ Volume ] - It can adjust the volume of each channel (Input) and change the mixer (Output) of all channels by the volume slider. - It can be set OFF / ON the volume of each channel by mute button. [ Frequency ] - It can set the value of the frequency in 20Hz - 20000Hz. - It can set the frequency value in the software keyboard by tapping the frequency label. - It can set the frequency value at the corresponding slider to the logarithm. - It can set the frequency value of -1 / + 1 octave from the current value by -1/+1 Octave button. - It can adjust the frequency value slightly from the current value by -/+ button. [ Preset ] - It can set the frequency value of Guitar (E A D G B E), 6-string bass (B E A D G C) for Ch 1 ~ 6. Guitar : Ch 1: E ( 82.4 Hz) Ch 2: A (110.0 Hz) Ch 3: D (146.8 Hz) Ch 4: G (196.0 Hz) Ch 5: B (246.9 Hz) Ch 6: E (329.6 Hz) 6-string bass (+ 1 octave) : Ch 1: B ( 61.7 Hz) Ch 2: E ( 82.4 Hz) Ch 3: A (110.0 Hz) Ch 4: D (146.8 Hz) Ch 5: G (196.0 Hz) Ch 6: C (262.0 Hz)

About

Viking Synth

This app emulates a classic monophonic analog synthesizer with advanced DSP technology. It features three variable wave oscillators, dual ladder filters, an LFO, and two modulation busses for versatile sound design. An intuitive interface and extensive preset library make it ideal for creating thick bass and rich lead sounds.

Highlights
  • Three continuously variable wave oscillators
  • Dual ladder filters (Lowpass/Highpass)
  • Multi-wave LFO
  • Two modulation busses
  • Intuitive user interface with expandable controls
  • 228 presets including Bass, Lead, and Synthwave
  • State-of-the-art DSP for authentic sound
Read full description

Viking Synth is an authentic emulation of a classic monophonic analog synthesizer. It has three continuously variable wave oscillators, two ladder filters with a Dual Lowpass or Highpass/Lowpass configuration, a multi-wave LFO, and two modulation busses. Viking Synth uses state of the art DSP technology to accurately reproduce the sound of the hardware. You get a desktop quality plug-in at an iOS friendly price. Viking Synth is an Audio Unit Extension Instrument (AUv3) that works as a plug-in inside host apps. Just open up your favorite host that supports Audio Unit Instruments and select it from the list of available Audio Units. Compatible with GarageBand, Cubasis, Auria, BeatMaker, AudioBus, AUM, Modstep, and more. The user interface of Viking Synth is designed for quick and intuitive control. Knobs and sliders expand during tweaking and are designed so the current value isn't hidden below your finger. The six pages divide the synth into logical sections that can be accessed quickly. The filter display acts as an XY pad for controlling cutoff and resonance. Simply double tap a knob or slider to reset it to its default value. Presets Viking Synth comes with 228 presets in the categories Bass, Bright Lead, Electro Bass, FX, Percussive Lead, Soft Lead, and Synthwave. The synth excels at thick bass and rich lead sounds. The 50 Electro Bass and 50 Synthwave presets were designed by renowned sound designer eXode. Presets work perfectly with GarageBand, Cubasis, and AUM. Oscillators At the heart of Viking are three adjustable wave oscillators. The continuously variable waveform knob gives the oscillators a unique sound that can’t be achieved with the fixed waveforms found in most synths. A noise oscillator provides three types of noise, one specifically modeled after the hardware. Modulation Two modulation busses and an LFO provide flexible modulation capabilities. All of the options hidden deep in menus on the hardware are immediately accessible with one tap. Filters The filters are classic transistor ladder filters modeled meticulously. Two DSP varieties are available allowing for either reduced CPU load or soft clipping plus three additional overdriven modes. The number of poles is adjustable for a wider range of filter sounds. Compare Viking to other synths: – Viking’s oscillators are free running, not sampled, wavetable based, or generated from a zero point – Viking’s oscillators use advanced techniques to avoid aliasing – Viking’s oscillators have instability, which is controllable through the tuning drift control – Viking’s nonlinear filter uses circuit modeling and provides soft clipping

Screenshots

Multiple Tone Generator4 screens
Viking Synth4 screens

Verdict

The call

The clearest difference is price: Multiple Tone Generator at Free against Viking Synth's $3.99. Multiple Tone Generator also leads on review sentiment (88% vs 71%). Viking Synth's advantage is in-app purchases (none vs 2) and ads (none vs shown). On rating, ratings volume, update cadence 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

Multiple Tone Generator is free to download; Viking Synth costs $3.99 up front. Multiple Tone Generator sells 2 one-off in-app purchases. Viking Synth asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Multiple Tone Generator against 4.7 for Viking Synth. Both are backed by a comparable volume of ratings — 66 and 42 respectively. Written reviews are what separate them: 88% of Multiple Tone Generator's written reviews are positive against 71% of Viking Synth's.

UpkeepUpdate frequency

Multiple Tone Generator ships an update every 3 months, Viking Synth every 4 months. The most recent releases landed on October 10, 2026 and October 12, 2026 respectively.

Scorecard6 real differences · 4 level
Multiple Tone Generator versus Viking Synth: the parameters behind the verdict, then further details
ParameterMultiple Tone GeneratorViking Synth
PriceFree — better$3.99
Rating4.8 (66 ratings) — better4.7 (42 ratings)
Positive reviews87.5% of reviews — better71.2% of reviews
Number of ratings66 — better42
Update frequencyEvery 3 months — betterEvery 4 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.012.0 — better
Further details — not scored
Size5 MB11 MB
Age rating4+4+
DeveloperLoop-Sessions.LLC.Blamsoft, Inc.

Customer experience

Multiple Tone Generator

All ratings66 ratings
Positive92.4%
Neutral4.5%
Negative3.0%
Written reviews16 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

Viking Synth

All ratings42 ratings
Positive92.9%
Neutral0.0%
Negative7.1%
Written reviews66 reviews
Positive71.2%
Neutral10.6%
Negative18.2%

Bugs and requests

Multiple Tone Generator

Not enough reviews yet to summarise bugs or requests.

Viking Synth

Reported bugs

6 issues
  • Presets not showing up
  • Presets disappear
  • App not showing in AUv3 menu
  • Settings not saving after iOS 14 update
  • Crashes when opening presets browser
Show 1 more
  • Saved presets not loading

Requested features

5 requests
  • More subtle drive mode
  • Categorized preset browser
  • Polyphony option
  • Dark mode
  • More apps from developer

In-app purchases

2 purchases

Multiple Tone Generator

One-time2
  • Increase channels from 6 to 16$1.99
  • Always remove banner ads.$4.99
None

Viking Synth

No in-app purchases

Questions

Is Multiple Tone Generator free?
Multiple Tone Generator is free to download, with in-app purchases available.
Is Viking Synth free?
Viking Synth costs $3.99, with no in-app purchases.
Which has better reviews, Multiple Tone Generator or Viking Synth?
Multiple Tone Generator is rated higher. Multiple Tone Generator averages 4.8 out of 5 from 66 ratings, while Viking Synth averages 4.7 from 42 ratings.
Do Multiple Tone Generator or Viking Synth have ads?
Multiple Tone Generator shows ads; Viking Synth does not.
Which is updated more often, Multiple Tone Generator or Viking Synth?
Multiple Tone Generator ships an update every 3 months, and Viking Synth every 4 months. Most recently, Multiple Tone Generator was updated on October 10, 2026 and Viking Synth on October 12, 2026.

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