BK vs Numa Player
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BK
Control and edit the real-time performance parameters of your Roland BK-9 Backing Keyboard directly from your iPad. Enhance your playing, practicing, and composing experience with quick access to tone editing, part mixing, and effects.
- Real-time parameter editing
- Tone editing
- Part mixing control
- Effects adjustment
- iPad touchscreen interface
- Enhanced performance tool
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Use the Apple iPad to display and edit the real-time performance parameters of your Roland BK-9 Backing Keyboard. With the BK-9 Performance Editor, you can use your iPad to directly access the BK-9’s real-time performance parameters as you play the keyboard. Via the iPad’s graphic display and large touchscreen, you have quick and convenient control of a wide selection of parameters, including tone editing, part mixing, effects, and much more. Designed for use alongside the keyboard’s own dual display system and extensive onboard controls, the BK-9 Performance Editor gives you a powerful tool for enhancing your BK-9 experience while performing, practicing, and composing. Communication between the BK-9 and iPad requires either of the following: - Apple iPad Camera Connection Kit (made by Apple Inc.) and a standard USB cable (Type-A male to Type-B male, readily available at retailers that sell computer accessories) - Roland WNA1100-RL Wireless USB Adapter (connected to the BK-9) and a wireless LAN access point with an Internet connection. - BK-9 Version 1.06 or later (available as a free download from the Roland website) is required in order to use this app with the BK-9.
Numa Player
This virtual instrument offers a multitimbral sound engine optimized for multi-core CPUs, providing low latency and high polyphony. It allows for flexible zone management, extensive sound libraries, and integrated effects for live performances and studio use.
- Multitimbral Instrument Player
- Cross-Platform (macOS, Windows, Linux, iOS)
- Standalone or Plugin mode
- Multi-core CPU optimization
- Infinite Zone management
- Extensive sound library
- 9 Insert Effects and 3 Master Effects
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Numa Player is a completely free virtual instrument. It's not only the perfect companion for your SL Keyboard, but it is also much more! The User Interface scales to different monitor sizes to fit best in your Audio/MIDI setup and makes Numa Player the first Studiologic Instrument Player available for macOS, Windows, Linux and iOS. KEY POINTS • A completely free Multitimbral Instrument Player. • The Only Cross-Platform Instrument: macOS, Windows, Linux and iOS. • Works in Standalone or Plugin mode. • The perfect match for Studiologic SL Controllers. • Live performances and Studio features. • A new "easy to use" user interface. • 4 Parts, 27 free sounds. • 9 Insert Effects and 3 Master Effects. MULTI-CORE. The advanced sound engine of Numa Player 2 takes your performance to the next level. It's now optimized to harness the full power of your device's multi-core cpu, delivering exceptional performance and ultra-low latency even in the most demanding setups1. Enjoy higher polyphony and smoother playback, no matter how complex your project gets. MULTIZONE. Designed with ultimate flexibility in mind, Numa Player 2 allows you to create and manage infinite Zones effortlessly. Add, duplicate, or drag and reposition zones with ease, all within an intuitive interface that puts full creative control at your fingertips. Customize each zone with its own sound parameters, keyboard ranges, and MIDI settings, or even assign custom colors for clear and easy navigation during your performance. MANY SOUNDS. Numa Player 2 comes packed with an extensive library of professionally recorded, high-quality sounds, covering a wide range of music genres and styles. Among Acoustic Pianos, punchy leads, orchestral textures and intricate percussive elements, find the perfect sound to bring your music to life. WHAT'S YOUR PROGRAM? In a Program you can combine any sound with its own insert effects. Save and load your program sets for Live performances and Studio sessions. 9x3 SOUND EFFECTS. MULTIPLY YOUR MOODS. Numa Player provides up to 9 integrated insert effects for each part and a Master effects section. LIVE OR STUDIO. PLAY SMARTER LIKE NEVER BEFORE. Organize the best Live Performarce setup with your devices and MIDI controllers or use Numa Player as an instrument plugin inside your DAW2 to create professional music sequences.
Screenshots
Verdict
The clearest difference is review sentiment: Numa Player at 85% against BK's 33%. Numa Player also leads on rating (4.7 vs 3.7) and update cadence (monthly vs every 9 months). BK's advantage is in-app purchases (none vs 4) and iOS requirement (8.1 vs 12.0). On price and ads 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. Numa Player sells 4 one-off in-app purchases. BK asks for nothing beyond the download.
Numa Player holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: Numa Player has 1.1K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of BK's written reviews are positive against 85% of Numa Player's.
BK ships an update every 9 months, Numa Player monthly. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.
| Parameter | BK | Numa Player |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) | 4.7 (1.1K ratings) — better |
| Positive reviews | 33.3% of reviews | 85.2% of reviews — better |
| Number of ratings | 3 | 1.1K — better |
| Update frequency | Every 9 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.1 — better | 12.0 |
| Further details — not scored | ||
| Size | 22 MB | 110 MB |
| Age rating | 4+ | 4+ |
| Developer | Roland Corporation | FATAR SRL |
Customer experience
BK
Numa Player
Bugs and requests
BK
Not enough reviews yet to summarise bugs or requests.
Numa Player
Reported bugs
3 issues- Crashing issues in GarageBand
- Incompatibility with some MIDI controllers
- Sustain pedal causing noise
Requested features
6 requests- More types of resonance (aliquot, body, bridge/soundboard)
- New piano models (Bosendorfer, Yamaha CFX)
- More instruments (brass, saxes)
- Ability to save custom patches
- Ability to resize on-screen keyboard
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- MIDI learn functionality
In-app purchases
BK
No in-app purchases
Numa Player
- Farfisa Compact$0.99
- VINTAGE PIANOS$17.99
- GRAN CODA$24.99
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- STAGE D$24.99









