Comparison

VStomp Amp HD vs Cali Axis Guitar Amplifier

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

Head to head
About

VStomp Amp HD

Experience legendary amplifier tones on your mobile device. This app uses advanced modeling technology to deliver realistic guitar and bass amp simulations with built-in effects and a user-friendly interface.

Highlights
  • Advanced CDCM modeling system
  • 23+ legendary amplifier models
  • 20+ classic cabinet models
  • Built-in delay and reverb effects
  • Smart noise gate
  • Simple, intuitive UI
Features
Read full description

HEART POUNDING AMPLIFIERS ON THE GO The heart pounding VStomp Amp is now ready to go! Following the development of Hotone’s powerful and versatile XTOMP pedal and based on our proprietary CDCM system, VStomp Amp Mobile delivers organic, studio-grade sound quality and the exact character of legendary amplifiers – just the same as desktop version. PLAY REAL – POWERED BY CDCM SYSTEM Unlike mainstream modeling methods based on the characteristics of a certain “state” of the circuitry, which just “comes close” to the modeled sound, VStomp Amp Mobile employs a complex system based on dynamic feature modeling. In this matrix, every single circuit component is ALIVE and performs like its original. The realness of the amp and effects tones has amazed XTOMP users worldwide, and now you can experience it on the go! Behind VStomp Amp Mobile is Hotone’s CDCM (Comprehensive Dynamic Circuit Modeling) system. CDCM is built on an extremely complex dynamic variation matrix, able to realistically express every detailed change that occurs during the operational process of actual circuitry. This matrix will adjust its own modeling parameters and even framework based on the instrument input signal range, signal frequency, knob position, the instrument’s own impedance, and other variable parameters, all to achieve the closest possible characteristics of actual modeled circuitry. THE ESSENTIALS No complex signal chain. No confusing customization or combinations. You pick an amp model, pick a cab model, add some ambience – it’s that simple! The less you tweak, the more you enjoy: just pick out your rig and ROCK! FEATURES λ Grown out of next-gen XTOMP technology λ Simple-but-real guitar/bass amp simulator with easy-to-use UI λ Advanced CDCM modeling system ensures realistic playing experience λ Growing amp/cab library λ 23+ CDCM powered legendary vintage and modern amplifier models λ 20+ CDCM powered classic cabinet models λ Built-in delay and reverb effects with simple operation and huge ambience λ Built-in smart noise gate For more information: www.hotoneaudio.com

About

Cali Axis Guitar Amplifier

This app offers a versatile guitar amplifier simulation with multiple preamp modes, an FX section, and a power amp. It includes digital delay, analog modulations, ambient reverb, and a noise gate for shaping your sound. Works as a standalone app or with other audio applications.

Highlights
  • Multiple preamp modes
  • Adjustable FX section
  • Virtual EL34 power tubes
  • Digital delay with filter and offset
  • Analog Chorus or Tremolo
  • Ambient Hall reverb
  • Noise gate and studio compressor
Features
Read full description

“Cali Axis is an arsenal of the most powerful guitar tones now available in standalone and plugin format” PREAMPLIFIER Nembrini Audio Cali Axis All Tube Guitar Amplifier plugin is based on Mesa Boogie TriAxis* preamplifier. Eight separate modes deliver the elusive creamy gain of the Mk I, the heralded focus of the Mk I, the scooped Rhythm of the Mk IV, and a modified British lead mode. But these are just a few of the classic sounds at your fingertips. FX SECTION Select, enable and change the order of the single FXs. POWER AMPLIFIER Powered by four EL34 virtual tubes with presence, resonance, volume and power switch in class AB push-pull configuration. MODERN button change the negative feedback in a way to have a more “modern” presence behaviour. DIGITAL DELAY FILTER make the delay Lo-Fi and OFFSET create a time offset in left/right delay sections ANALOG MODULATIONS select Chorus or Tremolo modulation AMBIENT REVERB Hall reverb algorithm FILTER A/B TIGHT : Clockwise rotation reduces low frequency content tightening the low range, suitable for 7/8 strings guitars. RUMBLING : Clockwise rotation reduces low frequency content. HARSH : Clockwise rotation reduces high frequency content. ANALOG NOISE GATE tuned for guitar and bass with GATE speed control STUDIO COMPRESSOR keep your dynamics in check, whether just thickening the sound or keeping levels consistent Works as a standalone app, AudioUnit v3 effect, or Inter-App Audio effect. Legal Disclaimer: TriAxis is a registered trademark of Mesa Engineering. Nembrini Audio Cali Axis was developed by Nembrini Audio SRL based on its own modelling techniques. Mesa Engineering has not endorsed nor sponsored the Nembrini Audio Cali Axis in any manner, nor licensed any intellectual property for use in this product.

Screenshots

Cali Axis Guitar Amplifier1 screens

Verdict

The call

The clearest difference is review sentiment: Cali Axis Guitar Amplifier at 100% against VStomp Amp HD's 33%. Cali Axis Guitar Amplifier also leads on rating (5.0 vs 4.2) and in-app purchases (none vs 10). VStomp Amp HD's advantage is price (Free vs $9.99) and update cadence (every 3 weeks vs every 38 months). On ratings volume and ads 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

VStomp Amp HD is free to download; Cali Axis Guitar Amplifier costs $9.99 up front. VStomp Amp HD sells 10 one-off in-app purchases. Cali Axis Guitar Amplifier asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Cali Axis Guitar Amplifier holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 10 and 7 respectively. Written reviews point the same way: 33% of VStomp Amp HD's written reviews are positive against 100% of Cali Axis Guitar Amplifier's.

UpkeepUpdate frequency

VStomp Amp HD ships an update every 3 weeks, Cali Axis Guitar Amplifier every 38 months. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

Scorecard8 real differences · 2 level
VStomp Amp HD versus Cali Axis Guitar Amplifier: the parameters behind the verdict, then further details
ParameterVStomp Amp HDCali Axis Guitar Amplifier
PriceFree — better$9.99
Rating4.2 (10 ratings)5.0 (7 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings10 — better7
Update frequencyEvery 3 weeks — betterEvery 38 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS9.0 — better15
Further details — not scored
Size114 MB29 MB
Age rating4++4
DeveloperHotoneNembrini Audio

Customer experience

VStomp Amp HD

All ratings10 ratings
Positive70.0%
Neutral20.0%
Negative10.0%
Written reviews12 reviews
Positive33.3%
Neutral41.7%
Negative25.0%

Cali Axis Guitar Amplifier

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

10 purchases

VStomp Amp HD

One-time10
  • Fryman HB$0.99
  • Rector 4x12$0.99
  • Rector Dual$1.99
Show 7 more
  • BASS PACK$1.99
  • CRUNCH PACK$2.99
  • ALL-CAB PACK$4.99
  • SPECIAL LEAD PACK$4.99
  • HIGH GAIN PACK$9.99
  • ALL-AMP PACK$29.99
  • ALL-IN PACK$29.99
None

Cali Axis Guitar Amplifier

No in-app purchases

Questions

Is VStomp Amp HD free?
VStomp Amp HD is free to download, with in-app purchases available.
Is Cali Axis Guitar Amplifier free?
Cali Axis Guitar Amplifier costs $9.99, with no in-app purchases.
Which has better reviews, VStomp Amp HD or Cali Axis Guitar Amplifier?
Cali Axis Guitar Amplifier is rated higher. VStomp Amp HD averages 4.2 out of 5 from 10 ratings, while Cali Axis Guitar Amplifier averages 5.0 from 7 ratings.
Do VStomp Amp HD or Cali Axis Guitar Amplifier have ads?
Neither VStomp Amp HD nor Cali Axis Guitar Amplifier shows ads.
Which is updated more often, VStomp Amp HD or Cali Axis Guitar Amplifier?
VStomp Amp HD ships an update every 3 weeks, and Cali Axis Guitar Amplifier every 38 months. Most recently, VStomp Amp HD was updated on November 2, 2026 and Cali Axis Guitar Amplifier on November 5, 2026.

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