iPhone 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 and intuitive “no menu” interface designed for your iPhone.

Close your eyes and you’ll swear you’re hearing the real thing. With BIAS, 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 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 is 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 and 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 setup directly in either JamUp or JamUp Pro. JamUp adds an amp and six effects to your BIAS rigs; JamUp Pro adds six amps and sixteen premium stomp-box and 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 Amp places unequaled tone at your fingertips.

● Complete, accurate and versatile amp modeling
● 36 amp models included with the introductory release
● Factory categories 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
● 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
● 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

For iPhone 7 users: You will need a Lightning interface with an output to use this Positive Grid app. For more information, please visit: https://help.positivegrid.com/hc/en-us/articles/115003558023-How-to-set-up-with-my-iPhone-iPad-

Also check out BIAS Desktop (AAX/RTAS/VST/AU) at: www.positivegrid.com

For more information, please visit:
Twitter: @PositiveGrid

What's New

Version 1.8.2

Hi there,

This latest update improves the overall stability for connecting with hardware devices.

Rock On,
The Positive Grid Team

Ratings and Reviews

4.3 out of 5

26 Ratings

26 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
203.4 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad Wi-Fi (3rd generation), iPad Wi‑Fi + Cellular (3rd generation), iPad Wi-Fi (4th generation), iPad Wi-Fi + Cellular (4th generation), iPad mini Wi-Fi, iPad mini Wi-Fi + Cellular, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, 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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