Now they've been released, here are links leading to the online demos of the Kotonoha sisters and Saki ^^ Akane : https://ah-soft.com/synth-v/kotonoha/demo/ Aoi : https://ah-soft.com/synth-v/kotonoha/demo/ Saki : https://ah-soft.com/synth-v/saki/demo/ Here's also the former ""demo"" of Saki (aka SynthV Web edition) : https://synthesizerv.com/web/
For further details on these "trial" versions: Kotonoha Akane and Aoi One unified voice database. Put simply their only difference as VOICEROID vocals was dialect, so they share a voice database. Available pitch group: C#4, notified as Cs4. Their full voice database has G#3, C#4, F#4 and C5 (Falsetto). Saki This is the same database as her Web Synthesizer V version, but has the Synthesizer V Studio UI. Available pitch group: C4. Her full voice database has G#3, C4, F4 and B4 (Falsetto). When you first load these web versions the interface will be in Japanese. If you click the cog it will open a settings panel and the top option is Interface Language. From what I can tell it has the same capabilities as Synthesizer V Studio Basic, except limited to one track and you can only save projects, not render the vocals. Very good for a "try before you buy" approach.