iPhone owners have the opposite problem: too many polished dividend apps, all charging subscriptions, most doing the same job. Here's how to cut through the noise.
Only three features earn their keep on iOS. One: a dividend payout calendar that's actually free. Not free with the dates behind a paywall. The calendar is the core of a payout tracker, and if you can't see ex-div dates and pay dates without paying, the app failed its one job. A dividend payout calendar app free in name only is just a sales pitch with a demo attached.

Two: a mobile app for dividend payout alerts that pings you a day or two before the ex-dividend date. This prevents the dumbest mistake in dividend investing, buying one day late and missing the payout. The alert is the feature. Everything else is garnish.
Three: a dividend history lookup app function for checking a streak in the parking lot before you place the trade. Fifty years of raises means nothing if you can't verify it in ten seconds. Type the ticker, see the history, decide.
Widgets are nice. Charts are nice. But widgets don't pay you, and a pretty chart of a dividend that just got cut is a memorial, not an investment.
One iOS-specific warning. The App Store has a refund window, but dividend app subscriptions are famous for auto-renewing quietly in the background. If you trial a paid tracker, cancel the trial the same day you start it. You can always resubscribe later. Nobody ever does. That tells you everything about which apps were worth it.
For the math, a dividend income calculator app on iOS or Android turns share counts into projected income. The heavy lifting stays on the web: run the full plan in a dividend income planner at dividenddb.fyi, where the screener and multi-year history live.