Piano Companion is a music theory reference app for songwriters, producers, teachers, and students. Look up any of 1,500+ chords or 10,000+ scales instantly, build progressions, and explore harmony on iOS, Android, and Mac.
Whether you're stuck on a progression, blanking on a scale name, or just exploring — Piano Companion gives you the answer in seconds. Press the keys you know, and it tells you what you're playing.
Search by name or tap the keys you know. Piano Companion identifies what you're playing — even from a MIDI keyboard.
The Chord Progression Builder suggests chords that fit your key. Experiment with patterns, listen back, and find what sounds right.
See notes on the grand staff, fingering for both hands, intervals, degrees, and compatible scales — all in context, not abstract textbook diagrams.
Since the EA app manages its own files, it has a built-in repair function that can automatically restore missing or corrupt DLLs like Ok.dll .
: Uninstall Origin from your Control Panel and download the latest version from the official EA/Origin website . 2. Update Microsoft Visual C++ Redistributables
If you have landed on this page, you are likely staring at a frustrating error message involving a file named . Whether you are a gamer trying to launch a classic title, a developer running legacy software, or an IT technician troubleshooting a system error, this guide is for you.
Rather than downloading a single file from an untrusted source, use these official methods to restore the missing component. 1. Repair the EA App or Origin Client
Since the EA app manages its own files, it has a built-in repair function that can automatically restore missing or corrupt DLLs like Ok.dll .
: Uninstall Origin from your Control Panel and download the latest version from the official EA/Origin website . 2. Update Microsoft Visual C++ Redistributables Ok.dll Origin Download
If you have landed on this page, you are likely staring at a frustrating error message involving a file named . Whether you are a gamer trying to launch a classic title, a developer running legacy software, or an IT technician troubleshooting a system error, this guide is for you. Since the EA app manages its own files,
Rather than downloading a single file from an untrusted source, use these official methods to restore the missing component. 1. Repair the EA App or Origin Client Update Microsoft Visual C++ Redistributables If you have
Available on every major platform. Start exploring chords and scales today.
