Comparison

CV Mod vs Hilda Synthesizer

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

Head to head
About

CV Mod

This app provides two LFO/VCO oscillators for modular and semi-modular synthesizers. Connect your device's headphone output to your hardware to add modulation and sound sources. Create custom waveforms and control parameters via MIDI.

Highlights
  • 2 LFO/VCO oscillators
  • Custom drawable waveforms
  • MIDI CC control
  • Tempo sync
  • Envelope generators
  • XY pad control
Features
Read full description

CV Mod is a 2 LFO/VCO Oscillator Module meant to be used with modular or semi-modular synth hardware. Simply connect the headphone output of your iPhone or iPad to one or more CV or audio inputs on your hardware. To get the most out of this module, use a stereo breakout cable to separate the left and right audio channels. Just like that, you now have 2 additional LFOs or full range oscillators added to your rig! CV Mod can also send out signals via a connected DC-coupled audio interface. With Audiobus 3 and Inter-app audio support, you'll have an easier time routing CV Mod's outputs to wherever you need them to go. In the spirit of modular synthesis, you have complete control over each oscillator’s parameters via external MIDI. You can also modulate one oscillator’s frequency and phase with the other oscillator’s rate and depth controls. With two drawable wave table editors, you can create whatever crazy wave forms you like, unleashing a vast sea of possibilities. Instant grit! Intuitive controls via the main faders, XY pad, or MIDI CC make this an incredibly easy way to add more modulation and sound sources to your gear. Download now and have some good old-yet-new-fashioned creative fun! Key Features: 2 Oscillators that function as LFOs or sound sources with 5 frequency ranges: 1 Hz, 4 Hz, 40 Hz, 120 Hz, and VCO mode (full range). This wide set of ranges allows for ultra slow ambient filter sweeps and rip roaring ring-mod madness Choose from 8 different waveforms: Sine, Triangle, Sawtooth, Reverse Sawtooth, Square, Random, and two user defined shapes Wave Table grid editor allows you to draw 2 custom waveforms Each oscillator has its own envelope generator, which can be synchronized to subdivisions of the current tempo or the rate of one of the oscillators Multi-touch control of each oscillator’s rate, depth, and phase with easy to use faders Fine tuning control of each oscillator, + or - one octave Separate glide controls for each oscillator, with a configurable maximum glide time of 120 seconds! MIDI Keyboard control of an oscillator’s frequency allows you to play notes and use this app as an additional sound source in VCO mode Duophonic mode allows you to play two notes at once when both oscillators are controlled by MIDI keyboard in VCO mode XY Pad allows you to control up to 3 parameters, with the Z-axis mapped to touch pressure (if your device supports it) Tempo Sync feature that constrains each oscillator’s rate to subdivisions of the current tempo, when operating in one of the LFO modes Rich MIDI implementation allows you to control all oscillator settings via MIDI CC with MIDI learn. In addition, you can control each oscillator’s rate and the overall depth via pitch wheel, mod wheel, velocity, aftertouch, and note values (key tracking) Cross modulation capabilities allow you to modulate one oscillator’s phase and frequency with the rate and depth of the other oscillator Turn either oscillator into a trigger pulse, which can be synchronized to subdivisions of the current tempo or the rate of the other oscillator Ability to save presets and wave tables Other settings include: Tempo override from external MIDI clock or via Ableton Link Ableton Link integration Pitch bender range control (maximum of 2 octaves) Background audio mode Oscillator pan controls: each oscillator can be panned to the left channel, right channel, or center Aftertouch sensitivity control (allows you to take it easy on those older keybeds) Bit depth resolution reduction controls for each oscillator, which opens up even more possibilities

About

Hilda Synthesizer

This app offers a complex oscillator monosynth with a blend of west-coast and east-coast synthesis techniques. It features a wave folder, lowpass gate, 12-mode filter, and VCA circuit, all meticulously circuit-modelled for authentic analog or digital sound. It functions as a playable synth, MIDI sequencer, and audio effect.

Highlights
  • Complex Oscillator Monosynth
  • Wave folder and lowpass gate
  • 12-mode filter
  • Circuit-modelled analog sound
  • Built-in 16-step MIDI Sequencer
  • Audio effect for external audio
  • AUv3 compatibility
Features
Read full description

Hilda is a Complex Oscillator Monosynth, inspired by the most interesting aspects of both west-coast and east-coast synthesis techniques. You'll find a wave folder, lowpass gate, and audio-rate modulations, but also a 12-mode filter and traditional VCA circuit. All parts of the instrument are carefully circuit-modelled to sound as analog (or digital, where applicable) as possible. It's like a best-of-all-worlds semi modular synth, but without the patch cables. The unique mix of different synthesis components adds up to a unique sounding electronic instrument, which can be used as a playable synthesizer, a MIDI sequencer and an audio effect for external audio - or any combination of those three. - Full Audio Unit compatibility (AUv3 instrument, audio effect and MIDI processor modes supported) - Universal design (iPhone and iPad; iPad Air 2 or higher recommended) - Built-in analog style 16 Step MIDI Sequencer with custom scales - 12 mode filter, based on the Oberheim Xpander design - Drone mode lets you [partially] bypass the VCA/LPG and just go with the flow - DIY Lo-Fi digital delay circuit emulation - Live pads with effects that can be triggered via the UI (or via exposed AU Parameters) - All synth settings exposed a AU Parameters (for automation and MIDI learning in your host of choice) - MIDI Processor plugin mode disables synth to save CPU - Carefully handcrafted by yours truly, to capture the essence of my love for tinkering and experimenting with sound :-) Find the user manual on ruismaker.com

Screenshots

CV Mod1 screens
Hilda Synthesizer3 screens

Verdict

The call

The clearest difference is price: CV Mod at $1.99 against Hilda Synthesizer's $12.99. Hilda Synthesizer's advantage is update cadence (every 9 days vs every 3 weeks) and review sentiment (90% vs 80%). 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

CV Mod costs $1.99 and Hilda Synthesizer $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

CV Mod ships an update every 3 weeks, Hilda Synthesizer every 9 days. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
CV Mod versus Hilda Synthesizer: the parameters behind the verdict, then further details
ParameterCV ModHilda Synthesizer
Price$1.99 — better$12.99
Rating4.0 (8 ratings) — better—
Positive reviews80.0% of reviews90.0% of reviews — better
Number of ratings8 — better—
Update frequencyEvery 3 weeksEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12
Further details — not scored
Size19 MB6 MB
Age rating4+4+
DeveloperSteven ConnellyBram Bos

Customer experience

CV Mod

All ratings8 ratings
Positive75.0%
Neutral12.5%
Negative12.5%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Hilda Synthesizer

All ratings58 ratings
Positive98.3%
Neutral0.0%
Negative1.7%
Written reviews30 reviews
Positive90.0%
Neutral0.0%
Negative10.0%

In-app purchases

None

CV Mod

No in-app purchases

None

Hilda Synthesizer

No in-app purchases

Questions

Is CV Mod free?
CV Mod costs $1.99, with no in-app purchases.
Is Hilda Synthesizer free?
Hilda Synthesizer costs $12.99, with no in-app purchases.
Do CV Mod or Hilda Synthesizer have ads?
Neither CV Mod nor Hilda Synthesizer shows ads.
Which is updated more often, CV Mod or Hilda Synthesizer?
CV Mod ships an update every 3 weeks, and Hilda Synthesizer every 9 days. Most recently, CV Mod was updated on October 26, 2026 and Hilda Synthesizer on October 30, 2026.

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