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BassFlex vs UJAM Virtual Bassist

UJAM Virtual Bassist and BassFlex both give you a bass part from MIDI, but they're different kinds of tool. UJAM Virtual Bassist is a family of five sampled bass instruments, each with a Player Mode of styles and phrases that follow the chords you play, on Windows and Mac. BassFlex is an instrument with no phrases of its own, modeled, not sampled: presets for electric, acoustic and upright basses, a 24.3 MB download, $79.

What they have in common

Electric and upright basses. UJAM has four electric characters and MELLOW 2, a double bass. BassFlex has electric, acoustic and upright presets.
Slides. UJAM's Instrument Mode includes dead notes and slides. BassFlex plays slides when ComposerFlex's parts call for them.
An amp and effects. UJAM has amp settings and effect modes. BassFlex has a bass amp, cabinets, reverb and an eight-band EQ.
A trial before you buy. UJAM offers a free, fully working 7-day trial. BassFlex has a demo you can download and try before you buy.

Where UJAM Virtual Bassist stands out

Phrases and styles. Player Mode plays them from MIDI keys and follows the key and chord you play. ROYAL alone has 60 styles and 1,380 phrases; the bundle has 346 styles and 7,610.
Note by note, too, in Instrument Mode.
MIDI drag and drop of patterns into your DAW.
Mac as well as Windows, with AU and AAX plugins.
Royalty-free phrases in five characters.

Where BassFlex stands out

A standalone program and a plugin. BassFlex has both; UJAM's pages list plugin formats only.
Small. A 24.3 MB download. UJAM lists 7 GB of disk space.
Offline, with no account. A license key and your email address, entered once for each Windows user on each computer, one license for one person, to use on all of their own computers, and it never connects to the internet. UJAM lists an internet connection and a sign-in.
Shaped by hand. Over 70 sliders, and four slots (A to D) to switch between sounds or layer them.
Your song to a file. It renders a MIDI file to FLAC, or to WAV with the included command-line renderer.
Parts from ComposerFlex, our songwriting program. Palm mute, hammer-on, pull-off, slide, bend, vibrato, harmonic, slap and pop all arrive that way. BassFlex has no patterns or keyswitches, so for phrases that follow your chords, UJAM is the tool.
$79 for all its basses, where UJAM's are $119 each at list price, or $199 for the bundle of five.

Which to pick

On a Mac: UJAM Virtual Bassist.
For phrases that follow the chords you play: UJAM Virtual Bassist.
For parts from ComposerFlex or a MIDI file, with a standalone program: BassFlex.
If you'd rather have no account and no internet connection, at $79: BassFlex.

Owning both

UJAM brings the phrases and BassFlex brings an instrument you can shape, and a project can hold both plugins. Both have a trial: UJAM's is on ujam.com, and BassFlex's demo is here. This page doesn't compare how they sound. That's for your ears.

The facts side by side

Every fact about UJAM Virtual Bassist is from UJAM's own pages, checked on 7 November 2026. Prices are list prices in US dollars; sales come and go.

	BassFlex	UJAM Virtual Bassist
How it makes its sound	Modeled. It computes every note as you play, from the physics of plucked strings: the upright and acoustic basses sound through the body, and the electric basses through a pickup, some of them with a bass amp and cabinet. It plays no recordings.	Sampled: a musician's recorded performances, "coupled with" what the maker calls AI assisted bass articulations.
Price	$79, one-time	$119 each; the bundle of all five $199
Download and disk space	24.3 MB download, 50.6 MB installed	7 GB
Memory the maker asks for	4 GB, with 4 cores or more and 100 MB of disk (the minimum we state for every Flex program)	4 GB of RAM
Runs on	Windows 10 and 11, 64-bit	Windows 10 and 11; macOS 10.15 to 26 (Intel and Apple silicon); an internet connection is listed
Forms	Standalone and VST3	VST3, VST2, AU 2, AAX, 64-bit. A standalone program is not listed
Needs another program	Nothing else	A host program (a standalone program is not listed)
Copy protection	A license key and your email address, entered once for each Windows user on each computer. No account and no online activation.	Authorization through the UJAM App, or an email and password entered in the plugin
Computers per license	One license for one person, to use on all of their own computers	Not stated on the maker's pages
Demo	A demo to download and try before you buy	Free, fully functional 7-day trial
Basses included	Presets for electric bass, acoustic bass guitar and upright bass; four slots to layer sounds	Five basses: four electric and an acoustic double bass; styles and phrases played from MIDI keys (one title has 60 styles and 1,380 phrases; the bundle 346 styles and 7,610 phrases)

More: virtual basses compared: modeled and sampled, a table of 15 products, and all about BassFlex.

If something here is out of date, write to [email protected] and we'll correct it.

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