Developers Gibbon Digital are offering early access to Modul, a web-based MIDI step sequencer. Here's the details in their own words...
Modul plays well with MIDI capable devices. Think of it as a brain dedicated to control your synthesizers, drum machines and samplers all at once. Because Modul is web-based, it runs on any device with Chrome support. The current version of Modul is for desktop use primarily. You can use Modul on your smartphone or tablet using Chrome and native apps are coming soon for iOS and Android.
Here are some of the features we plan to include in future versions.
Important: you need a MIDI interface to use Modul. If you don't have a MIDI interface yet, take a look at the T4, a class compliant USB MIDI interface that will work with your smartphone, tablet and desktop computer as well.
Pricing and Availability:
Access to Modul is currently available through Patreon, starting at 1$/month.
Affordable workstation type keyboard