Comparison

Viking Synth vs FM Essential

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

Head to head
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

About

FM Essential

This app is an FM tone generator and synthesizer for iPhone and iPad, offering real-time performance capabilities and voice editing. It includes a variety of presets, arpeggiator patterns, chord pads, and scales, along with drum functionalities. The app also supports external hardware integration and advanced sound manipulation through effects, EQ, and a ball controller.

Highlights
  • FM tone generator
  • Real-time synth performance
  • Voice editing
  • Arpeggiator and chord pads
  • Effects and EQ edit
  • Ball controller for sound modulation
  • Step sequencer
Read full description

Featuring an FM tone generator, FM Essential is a synthesizer app for the iPhone and iPad that provides for real-time synth performances and also lets you edit voices. [Spec] -FM sound ・Tone Generator: FM ・Part: 1 ・Polyphony: 16 ・Preset Voice: 271 ・Arpeggiator patterns: 64 ・Chord pads: 20 ・Scales: 25 -Drum Part Tone Generator: Audio Part: 1 Drum Pad: 16 Drum Pad Set: 3 Functions Plug into MX! -You can play full 271 voices and voice store function if you connect your iOS with Yamaha music synthesizer MX BK/BU series. Effects/EQ edit -You can adjust parameters to edit effects and equalization. Ball controller -Touch and drag in ball controller to modulate the sound by simultaneously changing multiple parameters based on the ball position. Step sequencer -We can store the ball position in the currently selected scene box. Arpeggiator and chord pads -You can play Arpeggiator and Chord pads in addition to keyboard with various scales. What's MX BK/BU/WH series? Find more here: http://jp.yamaha.com/products/music-production/synthesizers/mx_bk_bu/?mode=series [Support] -Compatible with Audio Unit Extentions -Compatible devices: iPhone 5S, 6/6 plus, 6s/6s plus and SE, iPod touch 6th Generation or later, iPad Air 1st Generation or later, iPad mini 2nd Generation or later,iPad Pro

Screenshots

Viking Synth4 screens
FM Essential4 screens

Verdict

The call

The clearest difference is price: FM Essential at Free against Viking Synth's $3.99. Viking Synth's advantage is rating (4.7 vs 3.0) and review sentiment (71% vs 40%). On ratings volume, 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

FM Essential is free to download; Viking Synth costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Viking Synth holds the better App Store score, 4.7 against 3.0. Both are backed by a comparable volume of ratings — 42 and 70 respectively. Written reviews point the same way: 71% of Viking Synth's written reviews are positive against 40% of FM Essential's.

UpkeepUpdate frequency

Viking Synth ships an update every 4 months, FM Essential every 15 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

Scorecard6 real differences · 4 level
Viking Synth versus FM Essential: the parameters behind the verdict, then further details
ParameterViking SynthFM Essential
Price$3.99Free — better
Rating4.7 (42 ratings) — better3.0 (70 ratings)
Positive reviews71.2% of reviews — better40.0% of reviews
Number of ratings4270 — better
Update frequencyEvery 4 months — betterEvery 15 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size11 MB88 MB
Age rating4+4+
DeveloperBlamsoft, Inc.Yamaha Corporation of America

Customer experience

Viking Synth

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

FM Essential

All ratings65 ratings
Positive43.1%
Neutral12.3%
Negative44.6%
Written reviews40 reviews
Positive40.0%
Neutral12.5%
Negative47.5%

Bugs and 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

FM Essential

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Viking Synth

No in-app purchases

None

FM Essential

No in-app purchases

Questions

Is Viking Synth free?
Viking Synth costs $3.99, with no in-app purchases.
Is FM Essential free?
FM Essential is free to download, with no in-app purchases.
Which has better reviews, Viking Synth or FM Essential?
Viking Synth is rated higher. Viking Synth averages 4.7 out of 5 from 42 ratings, while FM Essential averages 3.0 from 70 ratings.
Do Viking Synth or FM Essential have ads?
Neither Viking Synth nor FM Essential shows ads.
Which is updated more often, Viking Synth or FM Essential?
Viking Synth ships an update every 4 months, and FM Essential every 15 months. Most recently, Viking Synth was updated on October 16, 2026 and FM Essential on October 15, 2026.

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