What is the cheapest keyboard that works with Simply Piano?

The cheapest one worth buying is the Casiotone CT-S1 (61 touch-sensitive keys). Cheaper mini-key boards technically work through the app's microphone, but their few, unweighted keys make them a poor learning tool you'll outgrow quickly.

Can I just buy a $60 keyboard for Simply Piano?

You can, and the app's microphone will detect it — but most $60 keyboards have too few keys (25–49) and unweighted mini keys that build bad habits. You'll replace it fast, so it's rarely a real saving.

What's the cheapest 88-key option for Simply Piano?

The Yamaha P-145 is the lowest-cost 88-key weighted digital piano we recommend. It connects over USB and won't need replacing as you advance.

Do cheaper keyboards connect to Simply Piano differently?

Budget keyboards usually connect over USB (or the microphone). Bluetooth MIDI tends to appear on slightly pricier models like the Casio PX-S1100. See does my keyboard work with Simply Piano for connection details.