BASSASIO audio library

DownloadVersion: 1.4.2

BASSASIO is a library for use in Windows software. Its purpose is to make it simple for developers to use ASIO hardware/drivers in their productions. C/C++, Visual Basic and Delphi APIs are included with examples. A .Net API is also available.

The BASS library is not required by BASSASIO, but it can be used for decoding purposes and to apply DSP/FX, etc.

Main features


BASSASIO is free for non-commercial use. If you are a non-commercial entity (eg. an individual) and you are not making any money from your product (through sales, advertising, etc) then you can use BASSASIO in it for free. Otherwise, one of the following licences will be required.

PurchaseShareware licence: €40

The "shareware" licence allows the usage of BASSASIO in an unlimited number of your shareware products, which must sell for no more than 40 Euros each. If you're an individual (not a corporation) making and selling your own software (and its price is within the limit), this is the licence for you.

PurchaseSingle Commercial licence: €300

The "single commercial" licence allows the usage of BASSASIO in a single commercial product.

PurchaseUnlimited Commercial licence: €900

The "unlimited commercial" licence allows the usage of BASSASIO in an unlimited number of your commercial products. This licence applies to a single site.

License BASSASIO and BASS together, and receive a 50% discount!
(Shareware: €20, Single Commercial: €150, Unlimited Commercial: €450)

note that all prices are quoted in Euros, but payment can also be made in several other currencies

In all cases there are no royalties to pay, and you can use all future BASSASIO updates without further cost. Reselling/sublicensing is not permitted. Your products must be end-user products, eg. not components used by other products. Please note that these licences only cover your own software, not the publishing of other's software. If you have got any questions, please get in touch.

Other APIs

These APIs are provided by 3rd-parties, so may not always be up-to-date with the latest BASSASIO version & features.


.Net API for BASSASIO, as well as BASS and all of its add-ons. Can be used with both C# and VB, with several examples included. Includes support for .NET Framework 2.0/4.0/4.5, .NET Core 2.1/3.0 and .NET Standard 2.0. The documentation can be viewed online: here.

DownloadPure Basic API

Pure Basic API for BASSASIO.

Other stuff

LinkBASSASIO Documentation

An online copy of the BASSASIO (and BASS) documentation.

LinkThe BASS showcase

A list of stuff that uses BASS and/or BASSASIO.