Two Canadian women have created a smartphone app that lets women write reviews of men they've dated and share those with other women.

Lulu is strictly women-only, and lets users rate men using a score and descriptive "hashtags."

Alison Schwartz, one of the co-founders of Lulu, says it is now being used by more than three million women, and that one in four female university students has it on their phone.

"You wouldn't hire a babysitter without a reference," she told CBC's The Current in an interview. "Why wouldn't you get references for relationships?"

The Current explored different perspectives on the app from: