Video calling is the single feature that earns a smartphone its keep for most seniors. We installed and used FaceTime, WhatsApp, Facebook Messenger, and Zoom for 30 days each with four first-time users aged 71 to 86. Here is what we learned.

What actually matters

The "best" video app isn't the one with the most features. It is the one the senior's family is already using, and the one that requires the fewest taps to answer a call. We graded each app on three things: incoming-call clarity, the number of taps from notification to "I can see and hear my granddaughter," and how often the app updated itself in a way that moved buttons.

FaceTime

Best for iPhone-to-iPhone households. Built in to every iPhone, no separate app to install, and an incoming FaceTime looks identical to a regular phone call. One tap to answer. The catch: it only works on Apple devices unless the senior is willing to send and open web links, which defeats the simplicity.

WhatsApp

Best for mixed iPhone/Android families. The interface is reasonably consistent across both platforms, voice and video quality are excellent, and one-tap answering works once the app is set up. The setup itself requires entering a verification code from a text, which trips up some first-time users — plan to do this together.

Facebook Messenger

Best for users already on Facebook. If the senior already uses Facebook to look at family photos, Messenger is the natural choice — contacts and incoming calls "just work" without any setup. Be aware that Messenger has more advertising than the alternatives, and the in-app interface changes frequently.

Zoom

Best for scheduled group calls. Zoom is awkward for spontaneous one-tap calls but unmatched for weekly family check-ins or doctor's appointments. The "join by meeting ID" model is easier for many seniors than installing and signing in.

Our recommendation

If the household is all iPhone, use FaceTime. If anyone is on Android, use WhatsApp. Use Zoom only for scheduled group events. Do not install all four "just in case" — every additional app increases the chance of an accidental tap into something unfamiliar.

For step-by-step help setting up WhatsApp, or for our recommendations on which phone to choose in the first place, see our guide to the best smartphones for seniors.