Nomorobo sends all unknown callers to voicemail, and doesn’t offer any call screening services—so, if you’re looking for control over your phone, you’ll want to look elsewhere. RoboKiller’s advanced call blocking capabilities include real-time call screening, so you can find out the name and intent of every unknown caller before you answer. Plus, you can create custom allow/block lists to ensure you never miss a call you want or get a call you don’t.

Like most spam blockers, Nomorobo simply blocks calls from phone numbers on a block list—the problem is, scammers can just change numbers to get around that. RoboKiller, on the other hand, uses machine learning to detect scammers based on their unique audio fingerprints. Scammers may change their numbers, but they can’t change their voices.

Nomorobo needs to run in the background to work, which means Background App Refresh needs to be on. And if you restart your iPhone, you’ll need to relaunch Nomorobo to get it to work. RoboKiller protects from scam calls all the time, whether the app is running in the background or not.

Some robocallers imitate local phone numbers so you’re more likely to answer them. Unlike Nomorobo, RoboKiller knows how to identify and stop these sneaky spam calls before they reach you.

RoboKiller doesn’t just block robocalls—we make it fun. Answer Bots intercept incoming spam calls and mimic a real person to waste telemarketers’ time. You can even listen to the recordings. It’s a little poetic justice (and bonus entertainment) that Nomorobo just can’t offer.

Nomorobo also offers SMS protection, but it can’t keep up with spammers like RoboKiller can. Our spam text blocking is 99% effective at identifying and shutting down text scams.