iPad Screenshots


BIAS Amp is a professional virtual amp designer that offers replications of 36 of the best vintage and modern amps in rock. With BIAS Amp, you have the power to create new sounds by designing your custom dream amp—swap out the tubes, preamp, transformer, tone stacks, cab, and mic, all via a powerful, intuitive interface designed for your iPad.

Close your eyes, and you’ll swear you’re hearing the real thing. With BIAS Amp, you own a complete virtual collection of the most coveted and unique guitar amps of all time—some dating as far back as the 1940s. Every amp model is meticulously engineered to respond to your playing with immediacy, sensitivity, and realism that make you not only sound better, but also play better. And BIAS Amp sounds great on bass guitar, too.

But BIAS Amp doesn’t stop there. Create totally new sounds by designing your custom dream amp. It’s as easy as tap and drag. Using BIAS Amp’s highly intuitive and Lightning-fast interface, it’s child’s play to instantly swap out colorful tube preamps, lush distortion circuits, classic tone stacks, boutique power stages, custom-built transformers, and cabs loaded with specially matched speakers. The result is a depth and range of tones that’s unachievable using traditional guitar amps or other modelers. 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, exclusive tones in a heartbeat.

BIAS Amp integrates seamlessly with Positive Grid's BIAS FX and JamUp guitar multi-effects apps for iPad, expanding BIAS Amp into a powerful and completely unified professional guitar system for live use, recording, and jamming. Simply tap the JamUp icon on BIAS Amp's upper bar to open your current BIAS Amp setup directly in either JamUp or JamUp Pro. JamUp adds 1 amp and 6 effects to your BIAS Amp rigs; JamUp Pro adds 6 amps and 16 stomp-box and premium rack effects - including distortion, compression, tape delay, tremolo, and spring reverb. Both JamUp and JamUp Pro include Jam player, 8-track recorder and phrase sampler, tuner, and metronome, effectively turning BIAS Amp into a recording studio and top-of-the-line practice utility.

BIAS Amp works with GarageBand and other audio apps using iOS’s Inter-App Audio and Audiobus. Whether recording, songwriting, or honing your chops—at home or on the road—BIAS places unequaled tone at your fingertips.


• Complete, accurate, and versatile amp modeling
• 36 amp models included with the introductory release
• 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, 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 and room simulator
• Create a virtually unlimited number of custom amps
• Preset to recall each of your 8 favorite settings
• 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 Desktop (AAX/RTAS/VST/AU) at: www.positivegrid.com

For more information, please visit:
Twitter: @PositiveGrid

What's New

Version 1.8.1

Hi There,

Thanks for your feedback! In this new update, we’ve updated the Audiobus SDK to for compatibility improvements. We’ve also implemented some minor bug fixes in this update to improve the overall stability of the app.

Rock On!
Team Positive Grid

Ratings and Reviews

The Largest Array of Digital Amps Available


This is simply the best way to add thousands of amps to your tone toolkit. If you couple this Amp with Bias Pedal and Bias FX you have the best digital tone toolkit on the market.

Developer Response


Thanks a lot for the feedback! Cheers!


murdock and face

As a tweaker, I could mess around with this for hours at a time. It is a guitar players app, worth the price of the ipad if you don't already have one.

David Ball- casual primate

Casual Primate

Money is hard to come by these day. Nothing else you will buy for yourself musically will provide this kind of versatility and tone for so little money. I have owned this product for 6 months and am still creating new signal chains and tones. The depth of this amp modeller is astonishing.


Positive Grid Inc
215.2 MB
Requires iOS 9.0 or later. Compatible with iPad.
Age Rating
Rated 4+
© 2015 Positive Grid
In-App Purchases
  1. Insane Pack $13.99
  2. Glassy Pack $13.99
  3. Crunch Pack $13.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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