Read the terms of service! Yikes! – Simpler Pro Review

I immediately deleted the app. This is what spooked me. It sure looks like they will sniff your contracts for their own spam database. “We may also use your contacts and other data that we collect from other sources to enrich Simpler's database with current and up to date contact information (e.g. emails, names, phone numbers).”
Review by xboom on Simpler Pro.