Notion

With over 10 years in the App Store, Notion Mobile is a free, award-winning music composition tool for iOS, iPadOS®, macOS and more! You’ll effortlessly create dynamic compositions in traditional musical notation or guitar tablature with its intuitive touch-based interface and incredibly broad editing capabilities.

With a user-friendly interface and simple interactive piano keyboard, fretboard, drum pad, and even optional Handwriting Recognition, Notion Mobile makes it easy to get started composing your music. You can also hear your music performed with the most realistic playback possible, using real audio samples recorded by the London Symphony Orchestra at Abbey Road Studios.
Notion Mobile is a native cross-platform app, meaning you can write anywhere on any device without requiring a constant Internet connection. And when you’re back online, you’ll be able to sync your work across multiple devices — either through your preferred cloud provider, or through the optional wireless transfer between PreSonus applications on any device. Start your work on one device and finish it on another. Once you are happy with your creation you can share the Notion file, or export as MIDI, MusicXML, PDF or as an audio file.
Compose, edit, and play back your music performed with real piano and orchestral samples recorded by the London Symphony Orchestra at Abbey Road Studios — along with outstanding sampled guitar, bass, drums and other popular instruments. And when you’re ready for more sounds, you’ll find the extensive library of Notion Add-on Soundsets to purchase as part of the Feature Bundle. To save space, the initial app download contains just piano — you can then manage which of the bundled Soundsets to have on your device or keep in the cloud, just tap on Sound Installation.
Notion has been featured in various Apple campaigns including the 2014 YourVerse television commercials and has won several awards, including a prestigious music industry NAMM TEC Award for Best Smartphone/Tablet App.

What you get:
Notion Mobile includes unlimited staves, comprehensive editing features and core orchestral and rhythm section Soundsets — all for free. You can optionally register (also for free!) to unlock an additional Soundset (containing Solo Strings, Classical Saxophones and Glockenspiel), and the multivoice function that allows writing in up to 4 voices per staff. Then for the full experience, either sign in with your Studio One+ membership or purchase the Notion Feature Bundle. This unlocks Handwriting Recognition, Layout Controls, all the Expansion Soundsets (including many auxiliary instruments and additional articulations and effects), additional audio export formats (m4a, OPUS, FLAC) and direct file transfer between any PreSonus application running on the same network (including Notion Mobile, Notion Desktop, and Studio One.)

Free:
Unlimited staves
All editing features
Core Soundsets
Export as MusicXML, Compressed MusicXML, MIDI, PDF, wav, mp3
Welcome Pack (register for free):
Soundset including Solo Strings, Glockenspiel, Classical Saxophones
Additionally write for voices 3 and 4 in a single staff
Feature Bundle (in-app purchase or sign in with Studio One+):
Handwriting Recognition, powered by MyScript
Available on iPhone, iPad and macOS (macOS with supporting graphics tablet or using Sidecar with compatible iPad)
Automatic pen vs. finger recognition to switch between handwriting and edit mode
Pressure-sensitive support for Apple Pencil
Adjustable timer for Handwriting Recognition
Override handwriting timer by double tapping Apple Pencil (2nd Gen)
Layout Control
All Expansion Soundsets
Additional audio export formats (m4a, OPUS, FLAC)
Direct file transfer between any PreSonus application running on the same network (including Notion Mobile, Notion Desktop, and Studio One)