Logo must look great in black and white, so it's OK to start with just black and white and decide on colors later. Flat UI is preferred, to look great on transparent backgrounds and over photos. Logo needs to be as crisp as possible, think UBER logo glyph, OpenTable.com for example.
To give us an idea of the overall feeling of your brand, let us know which styles you lean towards
Looks good on both black and white backgrounds
Scientific and sophisticated, but too complex. Although I like the symmetry
Crisp and clear, but don't want shading.
Flat UI, crisp and clear
Modern logo, very web 3.0. Flat UI preferred, but will consider other options. Must look like it belongs to a Fortune 500 level company. Just like the last contest, if we have great logos, we will guarantee contest in last days.