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BIAS - Guitar and Bass Amp Designer and Modeler for iPhone

By Positive Grid Inc

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BIAS is an Amp Designer, Modeler and Processor. It's warm, accurate and more versatile than any other modeler, processor in hardware or software ever created.

BIAS starts with stunning replications of 36 of the most sought-after vintage and modern amps in rock ‘n’ roll history and then lets you customize them to respond perfectly to your unique touch and feel. Swap out the tubes, preamp, transformer, tone stacks, cab and mic—even change the tube’s bias—to create your dream amp and distinctive signature sound. Tap once to open your BIAS amp in JamUp and add awesome multi-effects.

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 also play better. And BIAS sounds great on bass guitar, too.

But BIAS doesn’t stop there. Create totally new sounds by designing your custom dream amp. It’s as easy as tap and drag. Using BIAS’ 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 not possible 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 integrates seamlessly with Positive Grid's free JamUp XT and optional JamUp Pro XT guitar multi-effects apps, expanding BIAS into a powerful and completely unified professional guitar system for live use, recording and jamming. Simply tap the JamUp icon on BIAS' upper bar to open your current BIAS amp setup directly in either JamUp XT or JamUp Pro XT. JamUp XT adds 1 amp and 6 effects to your BIAS rigs. JamUp Pro XT adds fully 6 amps and 16 stomp-box and premium rack effects - including distortion, compression, tape delay, tremolo and spring reverb. Both JamUp XT and JamUp Pro XT include Jam player, 8-track recorder and phrase sampler, tuner and metronome, effectively turning BIAS into a recording studio and top-of-the-line practice utility.

BIAS works with GarageBand and other audio apps using iOS 7’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.

• The most complete, accurate, and versatile amp modeling available in the world
• 36 amp models included with the introductory release
• Factory categories 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 own amp panel, change name, tolex, panel and knobs.
• Works 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
• Quick preset to recall each of your 8 favorite settings in turn with just one tap
• Seamless integration with JamUp XT and JamUp Pro XT, 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:
Twitter: @PositiveGrid

What's New in Version 1.5.10

What's new in BIAS 1.5.10:

This update adds new appearance support for BIAS Desktop amp models. It fixes tone stack's controls panel mapping issue and "save as" menu issue, and other minor improvements.

We continue to work with session artists world-wide to create professional custom amp models and amp-matched models made from recordings in leading studios. You can download BIAS Desktop demo for free at

BIAS Desktop is a groundbreaking guitar amp modeler with Positive Grid's Amp Match™ technology, it offers an entirely new concept of putting any tube amplifier tone and feel into a plug-in (AAX/RTAS/AU/VST) for Mac and PC. It features the most accurate, thorough and versatile guitar-amp modeler and designer engine, and it can accurately capture and match the tone of any tube amplifier, users can then share or download amp models from BIAS’s built-in ToneCloud® amp-sharing platform.

We've got some big things coming down the pipeline, stay tuned with us on our Facebook or Twitter!

Rock on,
The Positive Grid Team

iPhone Screenshot

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Customer Reviews

The best guitar app thus far

First off I will say I am NOT a fan of Jamup. Jamup was a great idea poorly executed. This app, Bias, is on the complete flip side. Yes, there are some digital artifacts, but minimal of all the apps I've seen so far. Also, if you disable your cellular data for all apps and disable wifi you will have less RF interference while playing. I play progressive metal and Djent. It took me about 5-10 minutes to dial up a tone I really liked vs Jamup which I have not found a solid amp. You can export your amp models to Jamup and they do sound much better than what in app purchases provide. The reason I rated 4 stars- tone qualify changes slightly and more background noise is present when you export to Jamup. I have emailed Positive Grid's support and they areole than willing to work with you on suggestions and troubleshooting. But the Bias app itself is everything I could have asked for in a portable practice setup. I am using it on my IPhone 5C with no issues. Great job on this one Positive Grid!

Pretty awesome app

I can't believe this thing sounds this good coming from my phone I never thought I would ever like anything like this. I know most guitarist put this app down but you know how guitarist are stuck on 1950's technology. Some of the few complains were that it feels like ever amp was design for modern metal or classic tube clean amps and nothing else. And the high gain was focus on low end I rather just use my my boss me 70 for lead solo. I wish they would have gave you crazy effects too instead of just basic effects. Another cool thing too is this thing actually sounds like an axe fx 2 on some of the tones. Who knows maybe people will be usein apps and tablets in bout 10 years for guitar tone and one more thing this thing sounds better than some of the actually gear I have which is pretty insane.

Weird artifacts, distortions etc

For some reason I can't get this software
to work as I'm imagining it should.
I've tried two different electric guitars,3
different cables, double and triple
checked my connections and there's still
a lot of crap in there in the signal. I've played guitar
since 1975 so I know what it's supposed
to sound like. I have an iPhone 6 and the
Jamup interface with an apple converter
so it will work on newer iPhones.

BIAS - Guitar and Bass Amp Designer and Modeler for iPhone
View In iTunes
  • $9.99
  • Category: Music
  • Updated:
  • Version: 1.5.10
  • Size: 166 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, 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, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
All Versions:

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