Ninja’s coffee lineup looks confusing because the names do not say what the machines do. The short answer: the CE251 is a classic programmable drip machine, the CM401 Specialty adds iced drinks, milk frothing and single-cup sizes, and the Hot & Cold Brewed System adds true cold brew and tea on top of everything else. All three use ordinary ground coffee, with no pods and no subscriptions.
The one-question shortcut
The fastest filter is what you drank last week. A pot of hot coffee most mornings points to the CE251, and you can stop reading there. Anything iced, anything with frothed milk, or one-person brewing makes the CM401 worth its premium. Loose-leaf tea or bottled cold brew you would rather make at home leaves only the Hot & Cold system, which is the one machine of the three that covers it.
What the tracker shows on price
The coffee-maker tracker covers these machines at different depths, and each product page carries its own live store rows and fair-price verdict, refreshed nightly, so read the current stock and timing picture there rather than from this guide. Stock states and seller mixes shift week to week, so treat the live rows on each page as the source of truth; in the same family we also track the CE451 FreshBrew.
The Ninja to pick
Most kitchens are happiest with the CM401, because it is the machine whose features get used. Choose the CE251 route, through labeled open-box stock or its CE451 successor, to spend the least on plain drip done well. Choose the Hot & Cold Brewed System only if tea or cold brew are real habits rather than plans. Whichever you pick, buy on a drop the data confirms rather than on a strike-through, because that difference is the reason this site exists.