Comparison

Jam Synth vs jAmp Doubler

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

Head to head
About

Jam Synth

Transform your guitar into a synthesizer with this app. It accurately tracks pitch and amplitude to control digital oscillators, offering unique synth leads and effects. Go beyond MIDI with expressive, organic sounds and advanced modulation options.

Highlights
  • Monophonic guitar synthesizer
  • Pitch and amplitude tracking
  • Multiple oscillator wave shapes
  • Dynamic filter tracking
  • Advanced FX section (LFO, Delay, Harmonizer, etc.)
  • MIDI output for external synths
  • High-accuracy pitch tuner
Read full description

Jam Synth is a fully featured monophonic guitar synthesizer / multi FX for iOS. It tracks the pitch and amplitude of an incoming guitar signal and uses this information to control digital oscillators, adding a unique guitar infused edge to your synth leads. Unlike typical pitch to MIDI converters, Jam Synth forgoes MIDI altogether when producing sounds internally because it is impossible to shoehorn the expressive pitch and dynamics of a stringed instrument into the MIDI standard. Jam Synth can accurately track string bends and vibrato with the extreme accuracy of a strobe tuner (1/10 of 1 cent) to produce much more organic synth sounds than other guitar to MIDI converters, including its own MIDI output (though its MIDI output still creates quite a unique guitar / synth hybrid sound because of its pitch bend abilities). It also features some of the most esoteric and unique FX you can get for your guitar. Features: • 3 Phase Distortion Oscillators (4 on iPad) with 8 different wave shapes: Saw, Square, Pulse, Double Sine, Saw-Pulse, Resonant 1, Resonant 2, and Resonant 3 • Filter can be set to track picking dynamics • Input section with Gate, Compressor, ADSR, and Input Filter • FX section - A fully featured LFO with 5 wave shapes and an invert switch for a wide range of pulsating effects - Stereo Delay with a stereo width control for ping pong effects and a filter for emulating analog delay - 3D Chorus, a classic "motionless" chorus that adds a stereo DIMENSION to the synth - Intelligent Harmonizer: This creates musically correct harmonies based on the key you are playing in. The harmonies can be altered by choosing a specific interval and one of the seven musical modes: Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian. It works on MIDI output using multi-channel pitch bending for synths that support such fancy things. It also works on your dry guitar output using high quality formant corrected pitch shift. It is just the best. - Rotary Vibe: This recreates the swirling psychedelic sounds of the 1960's by combining a thick 12-stage stereo phaser with a 3D rotary panning effect. Create anything from a slow stereo swirl to a futuristic synth organ with this. - Rainbows: Adds analog modeled auto rainbows to your sound. Adds extra rainbows when used with the harmonizer. - Time Stopper: Freezes time... • LFO / Stereo Delay / Rotary Vibe can be synced to tap tempo or incoming MIDI clock sync / Inter App Audio sync • Highly accurate pitch tracking and tuner, accurate to 1/10th of a cent • MIDI OUT and guitar to MIDI conversion for controlling other MIDI synths with your guitar through Core MIDI accessories and Virtual MIDI • string bends and vibrato are converted to MIDI pitch wheel data • picking dynamics are converted to MIDI volume expression data • compatible with guitar and audio interfaces made for iPhone and iPad • detailed user manual • Fat Bass • Super Chip Leads • Beagle Time • Little Cesars Jam Synth is designed to be easy to use even for users who don't have a lot of experience programming or playing synthesizers. When in doubt, just press buttons and turn knobs while plucking a string until you find a sound you like! J a m S y n t h 2 coming soon ---------------- http://www.facebook.com/PrimitiveDigitalSoftware

About

jAmp Doubler

This audio plugin creates a stereo effect by introducing a subtle delay to one audio channel. It offers precise control over the delay time and can be managed via MIDI. Ideal for enhancing mono audio sources with a wider soundstage.

Highlights
  • Stereo widening effect
  • Adjustable delay time (0-50 microseconds)
  • MIDI control
  • AUv3 plugin format
  • Enhances mono audio
Features
Read full description

Doubler is an AUv3 plugin that adds stereo effect by delaying the right channel wrt the left channel. The delay is controlled by the central knob and goes from 0 microseconds to 50 microseconds. It is possible to control this plugin via MIDI.

Screenshots

Jam Synth4 screens
jAmp Doubler1 screens

Verdict

The call

The clearest difference is in-app purchases: jAmp Doubler at none against Jam Synth's 4. jAmp Doubler also leads on update cadence (every 9 days vs every 4 months) and review sentiment (100% vs 84%). Jam Synth's advantage is ratings volume (28 vs 4) and iOS requirement (12.0 vs 14.0). On price, rating, ads 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

Both are free to download. Jam Synth sells 4 one-off in-app purchases. jAmp Doubler asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Jam Synth against 5.0 for jAmp Doubler. That said, the two scores are not equally well evidenced: Jam Synth has 28 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 84% of Jam Synth's written reviews are positive against 100% of jAmp Doubler's.

UpkeepUpdate frequency

Jam Synth ships an update every 4 months, jAmp Doubler every 9 days. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

Scorecard6 real differences · 4 level
Jam Synth versus jAmp Doubler: the parameters behind the verdict, then further details
ParameterJam SynthjAmp Doubler
PriceFreeFree
Rating5.0 (28 ratings)5.0 (4 ratings)
Positive reviews84.2% of reviews100.0% of reviews — better
Number of ratings28 — better4
Update frequencyEvery 4 monthsEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.0 — better14.0
Further details — not scored
Size5 MB6 MB
Age rating4+4+
DeveloperDerek MesecarJan Maes

Customer experience

Jam Synth

All ratings28 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews19 reviews
Positive84.2%
Neutral10.5%
Negative5.3%

jAmp Doubler

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Jam Synth

One-time4
  • Intelligent HarmonizerFree
  • Rotary VibeFree
  • RainbowsFree
Show 1 more
  • Time StopperFree
None

jAmp Doubler

No in-app purchases

Questions

Is Jam Synth free?
Jam Synth is free to download, with in-app purchases available.
Is jAmp Doubler free?
jAmp Doubler is free to download, with no in-app purchases.
Which has better reviews, Jam Synth or jAmp Doubler?
Jam Synth and jAmp Doubler are both rated 5.0 out of 5 on the App Store, from 28 and 4 ratings respectively.
Do Jam Synth or jAmp Doubler have ads?
Neither Jam Synth nor jAmp Doubler shows ads.
Which is updated more often, Jam Synth or jAmp Doubler?
Jam Synth ships an update every 4 months, and jAmp Doubler every 9 days. Most recently, Jam Synth was updated on October 6, 2026 and jAmp Doubler on October 12, 2026.

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