iPhone Screenshots


BIAS AMP 2 Mobile is a professional virtual amp designer that offers replications of 36 of the best vintage, modern and boutique amps in rock. The app gives you the power to create new sounds by designing your own dream amplifier, letting you swap out tubes, preamps, power amps, transformers, tone stacks, cab, and microphones, all via a powerful and intuitive interface designed for your iPhone. Whether you’re a classic rocker, metalhead, jazz player, bluesman or singer-songwriter - and whether you understand how amplifier electronics work or not - you’ll be dialing in killer and exclusive tones in a heartbeat.

BIAS AMP 2 Mobile adds a host of new features, including a powerful new user interface, new preamp and power amp tubes, tone stacks, Blues and Bass amp packs, new Dynamic Tone Control, new speaker cabinet module with multi-mic capability and open/closed back cabinet emulation and much more. In addition to all of these amazing new features, we’ve also partnered with legendary Celestion to create brand new custom multi-mic speaker cabs using their famed impulse responses!

BIAS AMP 2 Mobile seamlessly integrates with Positive Grid’s ToneCloud®, which is far more than a simple storage tank for your own custom tones - it’s an active community where thousands of guitarists upload, share and discuss tones. The ToneCloud® gives you access to thousands of custom amps created by artists, recording studios and guitarists like you, so you’ll never lack for sonic inspiration.

To take your tones to the next level, there are 9 full-featured reverbs in BIAS AMP 2 Mobile. These aren’t just simple two-knob reverbs either - they range from lush halls and chambers to intimate rooms, and each reverb has control of decay time, mix level, high and low cut filters, damping and dwell.

BIAS AMP 2 Mobile integrates seamlessly with Positive Grid's JamUp guitar multi-effects app, expanding BIAS AMP 2 Mobile into a powerful and completely unified professional guitar system for live use, recording and jamming. Both JamUp and JamUp Pro include effects processors, Jam player, 8-track recorder and phrase sampler, tuner and metronome, effectively turning BIAS AMP 2 Mobile into a recording studio and top-of-the-line practice utility.

BIAS AMP 2 Mobile also works with GarageBand and other audio apps using iOS’s Inter-App Audio and Audiobus. Whether you’re recording, writing songs or honing your chops—at home or on the road—BIAS products place unequaled tone at your fingertips.


• Complete, accurate and versatile component-level amp modeling
• 36 amp models included with the introductory release, with thousands more available via the ToneCloud®.
• Factory categories that allow you to organize amps by music genre and sonic impact (clean, blues, twang, crunch, metal, acoustic, and bass)
• Fully customizable preamps, tone stacks, power amps, transformers, cabinets, and mic selection and placement - mix and match!
• Customize the look and feel of your amp panel by changing the name, tolex, front panel and knobs
• Ability to work the way guitarists think: Tweak gain and overdrive, swap out tubes and transformers, change the cabinet and mic position and shape the tone with different tone stacks and two 8-band equalizers
• Noise gate
• 9 lush and full-featured reverbs
• Create a virtually unlimited number of custom amps
• Seamless integration with JamUp and JamUp Pro; open and save your amp models inside JamUp with one tap
• Works with GarageBand and other audio apps via Inter-App Audio and Audiobus

Also check out BIAS AMP 2 for desktop machines (AAX/VST/AU) at: www.positivegrid.com

For more information, please visit:
Twitter: @PositiveGrid

What's New

Version 2.0.0

Hi there,

BIAS AMP 2 for iPhone comes with a host of advancements and new features, including new amp packs, speaker cabs, tubes, transformers, tone stacks and more! The new cab module features dual micing capability and open/closed back cab emulation, and the brand new user interface and updated ToneCloud make using BIAS AMP 2 even faster and more intuitive.

BIAS AMP 2 represents a revolution in virtual amplifier design, providing the tools to take the ultimate guitar tones with you anywhere, from the studio to the stage and back again.

BIAS AMP 1 owners qualify for special upgrade pricing, so be sure to log in to your App Store account to learn more.

• New DSP sound engine
• New user interface
• New standard preamp tubes (12AY7, 12BH7)
• New standard power amp tubes (6550, KT88)
• 6 New tone stacks
• New transformer model and dynamic tone control
• New cab module with dual mic capability and open/closed back emulation
• 4 new cab models
• 2 new microphone models
• 45 new items in custom panel
• New Blues pack - Preamp, power amp and cabs for blues and mid-gain tones (IAP)
• New Bass pack - Preamp, power amp and cabs for bass guitar (IAP)
• New Celestion speaker cabinets (custom cabs created using officially-licensed Celestion Impulse Responses (IAP)

Rock On!
The Positive Grid Team

Ratings and Reviews

4.2 out of 5

47 Ratings

47 Ratings

The Best Thing Going


Without a doubt the best thing going for iPhone and iPad. No fizz, no buzz, no flop. Great bottom end too. Use it with AUM and add stereo FX. Use it with JamUp for a mono live set up. Could have been five stars but updates are poorly quality controlled. They tend to fix one thing and break another. Get that together PG...PLEASE!

Developer Response

Hi there, thanks a lot for the feedback. We are aware that the recent updates might have not been stable. We will be extra cautious with the coming updates! Please write us on https://help.positivegrid.com/hc/en-us/requests/new and we will keep you updated! Thank you!

Amazing, BUT...


Let me just start off by saying I absolutely love this app, BUT, when I use my iRig 2 to use BIAS, I connect my aux to my amp that has an aux in, I plug it in and other apps like JamUp sound perfect in there but when I use BIAS it’s WAAY too quiet. Please look into this, I don’t use this app much anymore because of it, but i do really like this app!

Developer Response

Hi, thank you for the feedback! Please write us through https://help.positivegrid.com/hc/en-us/requests/new with your current ID oSplicerr, and tell us more about the problem you encountered on BIAS Amp. Thank you very much!

Bias doesn’t cut it


I had high hopes for this iPhone amp. I heard many good things about how it sounds like a real set of amps. I bought in to bias whole set of effects amps and stomp boxes. It’s weak and I can’t get anything to sound other than a harsh compressed sound. Back to the drawing board.

Developer Response

Hi there, we are sorry that BIAS Amp did work better for you. Would you like write us on https://help.positivegrid.com/hc/en-us/requests/new and tell us more about it? Thank you for your feedback!


Positive Grid Inc
416.9 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2015 PositiveGrid Inc
In-App Purchases
  1. MetalPack $9.99
  2. GlassyPack $9.99
  3. CrunchPack $9.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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