LC4 Controller vs Sunday Keys
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LC4 Controller
This app provides wireless control for a music lab, allowing educators to manage student interactions and broadcast music from anywhere in the room. It includes features like student icon customization, attendance tracking, and access to the iPad's music library for class-wide playback.
- Wireless control of Yamaha LC4 Music Lab
- Customize and position student icons
- In-app attendance tracker
- Integrated notepad
- Broadcast music from iPad library
- Full hardware function access
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The exclusive LC4 Controller App gives you full control over the Yamaha LC4 Music Lab wirelessly from anywhere in the room. Music educators now have the freedom to leave their teacher station and visit students individually at their instruments to demonstrate passages, correct technique and posture, all the while maintaining the ability to operate the lab hardware wirelessly. The LC4 Controller App provides convenient access to all of the hardware functions and even adds more features. The app lets you customize and position student icons in the classroom view to match the physical layout of the instruments in the room. The in-app attendance tracker and notepad are conveniently included, eliminating the need for additional software. The LC4 Controller App even accesses the iPad’s music library and allows the teacher to broadcast songs wirelessly to the class. The LC4 Controller App is compatible only with the Yamaha LC4 Music Lab, and requires the optional LC4 WIFI KIT.
Sunday Keys
This app provides a comprehensive worship keyboard rig for iPad, allowing users to access and organize their sounds, patches, and setlists. It supports AUv3 instrument plugins and offers powerful audio and MIDI effects for live performance and service preparation.
- AUv3 instrument plugin hosting
- Organized sound, patch, and setlist library
- Touch-optimized interface
- Powerful audio and MIDI effects
- Tonic Pad Player for ambient pads
- MIDI hardware and Bluetooth support
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The Sunday Keys App is the best way to access your favorite resources from SundaySounds.com using just your iPad and now supports hosting your favorite AUv3 instrument plugins! Login to your existing SundaySounds.com account to access your available content and enjoy an optimized Sunday Keys experience, designed for churches, built for iPad. *****You'll need an existing SundaySounds.com account to use the Sunday Keys App. If you don't have any purchased resources you can still login with an existing Sunday Sounds account and try out the App in demo mode. Additional SundaySounds.com content will be made available over time within the Sunday Keys App. Sunday Keys features powerful workflows for fast preparation of your worship services and reliable live performance with on the fly flexibility and control. Featuring an interface designed for touch, quickly browse the ready to play Patches or create exactly what you need by easily layering Sounds together across the keyboard. The App is designed specifically for the needs of worship teams, so it's easy to stay organized. Easily browse your favorite Sounds, Patches, and Setlists from the User Library with full support for custom folders and built-in search tools. Setlist Sharing makes it easy to send a Setlist to a friend or member of your worship team with just a tap. Sunday Keys will deliver reliable performance and incredible results for your worship team, allowing you to take your live worship keys rig to the next level, all from your iPad. Based on your content from SundaySounds.com choose from a growing library of individual Sounds and ready to play Patches with more content to be added regularly.* Browse a wide selection of incredible Sounds including grand, upright, and felt pianos, warm and evolving pads, strings, synth leads, bass, and more. You can now also host your favorite AUv3 instrument plugins inside Sunday Keys, making this App the ultimate host for your favorite plugins! Sunday Keys features a full suite of audio effects including stereo Delay, lush Reverb, Chorus, Tremolo, Rotor, Overdrive, and more plus powerful midi effects including an Arpeggiator, Easy Chord, and a full midi Sequencer, all available for both the internal Sound Library and applying to AUv3 instruments as you'd like. Use the Tonic Pad Player to glue together your band and cover any transition with gorgeous background ambient pads. You have full control over the drone's sound, crossfade time, and tone so you'll always fill just the right amount of space. Use the Tonic Pad on the fly or easily program seamless changes per Patch as you move through your Setlist. Connect any class-compliant Midi hardware and an audio interface to the App and enjoy tactile control via full Midi Learn functionality. Bluetooth and Network Midi are also fully supported! Detailed information on Midi and Audio connections can be found here: https://support.sundaysounds.com/hc/en-us/articles/5874902996247 Download Sunday Keys to get started with an all new way to play worship keys. *Content will be added to the Sunday Keys App as it is available. The core Sunday Keys Sound Library will be prioritized as additional Sounds and Patches are added. Once the full library is available the Sunday Keys Sound Library will receive monthly updates according to the terms of our license agreement available at SundaySounds.com
Verdict
The clearest difference is update cadence: Sunday Keys at every 3 weeks against LC4 Controller's every 26 months. Sunday Keys also leads on ratings volume (115 vs 1). LC4 Controller's advantage is review sentiment (100% vs 71%) and rating (5.0 vs 4.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
LC4 Controller holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Sunday Keys has 115 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of LC4 Controller's written reviews are positive against 71% of Sunday Keys's.
LC4 Controller ships an update every 26 months, Sunday Keys every 3 weeks. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.
| Parameter | LC4 Controller | Sunday Keys |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.6 (115 ratings) |
| Positive reviews | 100.0% of reviews — better | 70.9% of reviews |
| Number of ratings | 1 | 115 — better |
| Update frequency | Every 26 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPad | iPad, Mac — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 201 MB |
| Age rating | 4+ | 4+ |
| Developer | Yamaha Corporation of America | Loop Community |
Customer experience
LC4 Controller
Sunday Keys
Bugs and requests
LC4 Controller
Not enough reviews yet to summarise bugs or requests.
Sunday Keys
Reported bugs
8 issues- App crashing on iPad
- Drone not working reliably
- Core audio error on iPad
- Sound library installation issues
- App not running on older macOS versions
Show 3 moreShow fewer
- UVI plugins sometimes fail to load
- App glitching and closing mid-service
- App reappearing after deletion
Requested features
10 requests- AUv3 plugin support for Logic Pro and GarageBand iOS
- Sampler/looper functionality
- Loop player
- MIDI monitor on main screen displaying chords
- Ability to use third-party plugins
Show 5 moreShow fewer
- HD Pianos sound library
- Graphical EQ
- Pitch bend wheel/lever
- Song-specific patches with more editing flexibility
- Assign controllers to more parameters (tremolo speed, envelope attack, etc.)
In-app purchases
LC4 Controller
No in-app purchases
Sunday Keys
No in-app purchases
Questions
Is LC4 Controller free?
Is Sunday Keys free?
Which has better reviews, LC4 Controller or Sunday Keys?
Do LC4 Controller or Sunday Keys have ads?
Which is updated more often, LC4 Controller or Sunday Keys?
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