Short answer
Both are strong medium-room planning candidates. Coway emphasizes a proven simple design; Levoit offers app controls and lower planning wattage. Current certified performance and filter prices should decide the final choice.
Room-size marketing is not directly comparable. Use smoke CADR, ceiling height, target air changes, replacement-filter cost, and noise at the speed you will actually run.
Coway AP-1512HH Mighty
People who want straightforward controls and a widely known medium-room design.
Levoit Core 400S
People who value app controls, lower planning power draw, and a compact modern interface.
Decision table
Put the same questions side by side.
| Factor | Coway AP-1512HH Mighty | Levoit Core 400S |
|---|---|---|
| Planning smoke CADR | About 233 CFM | About 231 CFM |
| Planning power | About 77 W at maximum | About 38 W at maximum |
| Planning filter cost | About $60 | About $70 |
| Controls | On-device controls and auto mode | App-connected controls and auto mode |
| Main strength | Balanced, established design | Connected controls and lower power estimate |
| Main risk | Higher maximum power estimate | App features do not replace correct sizing |
Run the numbers