1Chart 4+

Smarter Music Charts

Rookanga Digital, LLC

    • 4.3 • 29 Ratings
    • $15.99

iPad Screenshots



Create, share and print easy-to-read music charts with the only app that gives you all the power of the Nashville Number System, while also offering the flexibility of switching to letter-format chords whenever you like.

At the core, 1Chart is built around the Number System and all its shorthand flexibility for charting music. But why stop there?

1Chart is also built for those who prefer to read letter chords rather than number chords. “Am F C” or “6m 4 1”? The choice is yours. Now anyone who prefers letter chords can enjoy the Number System's concise charting advantages — without needing to read numbers.

Have a chart using letter chords and want to change keys? No problem. Select a new key, and your letter-format chart is updated to reflect the change.

- Clear typography makes your charts easier to read
- Copy/paste measures or sections for faster charting
- View charts in your choice of three font sizes
- Share charts and notebooks as PDFs or editable 1Chart files

- Support for chord inversions, as well as common and not-so-common chord qualities ("alt" chord, anyone?)
- For Numbers fans: Accidentals before or after chord numbers? 1Chart accommodates both preferences.

- Add as much rhythm/dynamic detail as you need. 1Chart includes characters for pushes, diamonds, the "mute triangle," etc., as well as the traditional notes and rests used in the Number System.
- Use traditional notation or "hash marks" to specify beat distribution in split measures
- Mark an area with a crescendo, decrescendo, ritardando or accelerando

- Beam notes above a single chord (e.g. to show an 8th-note feel) or across multiple chords (to show groove or beat distribution)
- Tie notes and diamonds

- Use repeat symbols, codas, segnos, etc.
- Select an area to specify 1st/2nd/etc. endings
- Separate sections with a single- or double-underline, or specify no formatting

- Option to align measures horizontally (4–8 measures per line)
- Style inversions with a horizontal or diagonal dividing line
- Choose "Minimize Horizontal Spacing" to fit more content per line

- Use Notebooks to gather your charts in easy-to-manage collections (to mirror a set list, for ex.)
- Share charts and notebooks by email
- Import from and export to cloud services such as iCloud Drive, Dropbox, etc. Imported files must be in 1Chart (.1ch) format.

- “Lock” your charts to prevent unintended edits
- Swipe left/right to access next/previous chart

Visit 1chartapp.com for help and to join the user community.

Nashville Numbers is an ingenious shorthand system for charting music that identifies chords by number (relating to scale degree) rather than letter, so charts are key-independent. A Number chart is valid no matter what key you choose to play it in.

Take a progression spelled with the chord letters, A, D, and E. In Numbers, these chords are written as “1, 4, 5,” matching their position in the A scale: A is first, D is fourth, and E is fifth.

Because scale relationships don't change when you change keys, “1, 4, 5” works in any key. Change the key to G, and “1, 4, 5” indicates you’ll want to play G, C and D — the first, fourth, and fifth notes of the G major scale.

Combine this flexibility with rhythmic and dynamic notation, and you’ve got a powerful format for creating concise roadmaps of songs for use when rehearsing or performing.

1Chart includes the option of showing chords in number or letter format, giving you the best of both worlds. You can easily toggle between number chords and letter chords at any time in any chart you create.

What’s New

Version 2.3

- When adding charts to a notebook, a new “Select All Charts” button makes it easier to create an exportable notebook containing all your charts.
- A notebook exported in 1Chart Notebook format (.1nb) now retains custom-sort info.
- Fixed a bug that could momentarily interfere with display of the header key after exiting Performance Mode.

Ratings and Reviews

4.3 out of 5
29 Ratings

29 Ratings

bshowerton ,

Voiceover Accessibility

I downloaded this app to be able to write Nashville charts, as it was recommended to me as a friend. I am totally blind, and I use the built in screen reader on the IPad Voiceover. There are some things that I can access with the screen reader beautifully within the app, but other things such as some text edit boxes which are not labeled and also there are some unlabeled buttons in the app where Voiceover just says button. I feel this app could be very useable for a blind musician, and having complete access to this app would greatly help me in my job as a worship pastor. The app is almost there as far as accessibility, but there are a few things that I would need access to as a voiceover user to completely be able to use the app at its fullest. I would love to be able to talk to someone from the development team so that I can demo for them what is accessible and what would need to be made accessible. I was pleasantly surprised to see that I could interact with this app at all with voiceover and I would love to be able to add this app to my toolbox. Thank you so much for taking the time to read this review.

Developer Response ,

Hello, bshowerton! Thanks for the review, and for sharing your experience with accessibility in 1Chart. We are certainly interested to hear your input on how we can improve things. We've received your email to support and will be in touch via that channel. Thanks again!

zoinksitszachbrown ,

Alignment issue, please fix!

I’m a full time musician in Nashville. I play on Lower Broadway regularly and the number system is how we communicate down there. First let me say most of the features on this app are awesome. I would use it for everything but paper charts still have the edge because of ONE issue…when you do ANY slash chords, split measures, or add repeat signs it throws off the alignment of that line which is hard to read. The chords don’t line up with each other vertically down the chart. (You can even see it in the screen shots of the app on the App Store) Each chord on the chart should be squared up on a grid system. The jagged lines make this app borderline unusable for a high pressure sight reading situation. Yes, I’m aware of the “align measures” feature but that wastes valuable screen space and still sometimes doesn’t line up right when there are lots of changes or multiple columns. I need all chords (regardless of modifiers) to fit squarely on the screen with ONE page in TWO columns. This is especially important with songs that have a lot of changes and large arrangements. Other than that, everything else in this app is fantastic. If the developer fixes this issue I will give 5 stars and never look back to paper charts. Thank you

Developer Response ,

Hello and thanks for taking the time to post a review! Great to hear 1Chart is helping out on Lower Broadway! We appreciate your feedback on alignment. Although alignment in the app is working as designed, we also fully understand that it’s not meeting your needs. Sounds like an “auto-align, auto-column-width-adjust” feature is more in line with what you’re looking for. We’ll definitely take your feedback into consideration as we plan future versions of the app. Thanks again, and please feel free to contact us via the 1Chart website any time you have additional suggestions — or if you’d like to follow up further on this topic!

Franciquini ,

Awesome! Wish it had a few things though

I absolutely love this app and it has made charting and organizing my charts a breeze. However, I would love to see the following in a future update:

1). Apple Pencil support. It would be awesome to be able to write on my charts directly in the app. The only way to do this is to export my chart as a PDF and save it elsewhere. I prefer keeping my charts within the app since the notebooks feature is super handy.

2). The ability to import PDFs. I like to add snippets of tabs over some of my charts. Since the app doesn’t allow me to add a screenshot of anything to my charts, it would at least be nice for me to do it in another app and then import that new pdf back into the app for the sake of organization.

Developer Response ,

Thanks so much for your review and feedback, Franciquini. We've noted these requests on the wish list for future updates. Please let us know anytime you have other ideas for 1Chart!

App Privacy

The developer, Rookanga Digital, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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