Xkey Plus vs TB Reverb
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Xkey Plus
This app enhances the functionality of ESI Xkey musical keyboards on mobile devices. It allows users to update firmware, customize velocity curves, and configure key sensitivity and timings for an advanced user experience.
- Check for new Xkey firmware
- Velocity curves editor
- Configure Xkey sensitivity & timings
- Access all Xkey parameters
- Configure key & button assignments
- Access Xkey documentation & support
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◆◆◆ Xkey Plus ◆◆◆ This app is dedicated to ESI Xkey musical keyboard. It is an ideal companion to your mobile keyboard. FEATURES ◆ Check for new Xkey firmware ◆ Velocity curves editor ◆ In-depth configuration of Xkey sensitivity & timings (advanced users) ◆ Access to all Xkey parameters (advanced users) ◆ Possibility to configure new assignments to all keys & buttons (requires Fw 1.2+) ◆ Direct access to Xkey documentation & support REQUIREMENTS ◆ Xkey musical keyboard ◆ USB cam kit or lightning cable ◆ Compatible with iPad (iOS 7 or later) Do not hesitate to contact us if you find any problem on this app. If you like this app, don't forget to write a positive review ! ESI
TB Reverb
This professional audio plug-in offers studio-grade reverberation with extensive customization options. It features real-time processing, advanced modulation, and dynamic effects for creative sound design. Compatible with AUv3 hosts, it provides a flexible workflow for musicians and producers.
- Studio-grade reverberation with early reflections
- Extensive parameter control (room size, width, density, etc.)
- Integrated LFO for parameter modulation
- Compression, ducking, and gating effects
- Shimmer reverb module
- Real-time spectrum analyzer and equalizer
- Reverb freeze option
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ToneBoosters Reverb is a studio-quality, professional reverberation AUv3 plug-in with an unrivalled workflow, unlimited creative use and a gorgeous, functional user interface. With its close to a hundred adjustable parameters, the integrated LFO for parameter modulation, integrated compression and gating, and its shimmer reverb module it is by far the most flexible and configurable reverb on iOS. The ToneBoosters Reverb app captures the microphone input and processes the signals in real time. To use it as a plug-in, use an AUv3-compatible host app such as Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others. ToneBoosters Reverb will appear in the list of Audio Unit extensions for effect plug-ins. Key features: - Studio-grade reverberation including early reflections - The same professional sound as the acclaimed desktop version - Full control over room size, width, density, depth, mass - Integrated spectrum analyser showing direct and reverb simultaneously - Integrated equalizer to shape the reverberation character - Ability to modify reverberation time across frequency - Compression, ducking and gating for dynamic reverberation effects - Flexible, beat-synced LFO that can modulate almost everything! - Dual pitch-shift shimmer module for out-of-this-world reverberation - Reverb freeze option - Random parameter option to change the core reverb sound on the spot - Eco mode for lower CPU load on complex projects - Program manager with shared programs between stand-alone, IAA and AUv3 instances - Undo/redo, and A/B comparison - Color themes for the user interface - Max screen support in Garageband - Optimised for iPad and compatible with iPhone and iPod Touch Compatibility Please note that given the large flexibility and number of parameters that can be modified with this reverb, the use of an Apple pencil or stylus is highly recommended for smaller devices such as iPhone and iPod touch. What you should know: - Licenses acquired for this platform are not compatible with other platforms. - Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.
Screenshots
Verdict
The clearest difference is review sentiment: TB Reverb at 94% against Xkey Plus's 36%. TB Reverb also leads on rating (4.8 vs 2.9) and ratings volume (55 vs 13). Xkey Plus's advantage is price (Free vs $8.99) and iOS requirement (9.3 vs 13.0). On update cadence, ads and in-app purchases 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
Xkey Plus is free to download; TB Reverb costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TB Reverb holds the better App Store score, 4.8 against 2.9. Both are backed by a comparable volume of ratings — 13 and 55 respectively. Written reviews point the same way: 36% of Xkey Plus's written reviews are positive against 94% of TB Reverb's.
Xkey Plus ships an update every 3 months, TB Reverb every 2 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | Xkey Plus | TB Reverb |
|---|---|---|
| Price | Free — better | $8.99 |
| Rating | 2.9 (13 ratings) | 4.8 (55 ratings) — better |
| Positive reviews | 35.7% of reviews | 94.3% of reviews — better |
| Number of ratings | 13 | 55 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.3 — better | 13.0 |
| Further details — not scored | ||
| Size | 9 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | ESI Audiotechnik GmbH | ToneBoosters |
Customer experience
Xkey Plus
TB Reverb
In-app purchases
Xkey Plus
No in-app purchases
TB Reverb
No in-app purchases









