Software startup is looking for a logo with recognition value

This short briefing was written by a client:

target-audience

Bookify creates applications that are used by hairstylists and normal smartphone users.

Description

We were thinking about a black slogan but we are pretty flexible. The image should match the slogan color (e.g.: green, pink).

The "book" in bookify means "booking" (e.g.: book an appointment), it is NOT a reference to a physical book! Therefore, the image could contain a calendar icon. The image of the logo should provide recognition value. Users should be able to know the content of the software by viewing the logo image. But also here we are pretty much flexible.

Some logos we like are the ones from Twitter, Apple or Spotify.

We require an Adobe Illustrator AI file and a PNG file.