Comparison

Xkey Plus vs TB Reverb

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Check for new Xkey firmware
  • Velocity curves editor
  • Configure Xkey sensitivity & timings
  • Access all Xkey parameters
  • Configure key & button assignments
  • Access Xkey documentation & support
Features
Read full description

◆◆◆ 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

About

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.

Highlights
  • 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
Read full description

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

TB Reverb4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Xkey Plus versus TB Reverb: the parameters behind the verdict, then further details
ParameterXkey PlusTB Reverb
PriceFree — better$8.99
Rating2.9 (13 ratings)4.8 (55 ratings) — better
Positive reviews35.7% of reviews94.3% of reviews — better
Number of ratings1355 — better
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS9.3 — better13.0
Further details — not scored
Size9 MB12 MB
Age rating4+4+
DeveloperESI Audiotechnik GmbHToneBoosters

Customer experience

Xkey Plus

All ratings13 ratings
Positive38.5%
Neutral23.1%
Negative38.5%
Written reviews14 reviews
Positive35.7%
Neutral21.4%
Negative42.9%

TB Reverb

All ratings54 ratings
Positive94.4%
Neutral0.0%
Negative5.6%
Written reviews35 reviews
Positive94.3%
Neutral0.0%
Negative5.7%

In-app purchases

None

Xkey Plus

No in-app purchases

None

TB Reverb

No in-app purchases

Questions

Is Xkey Plus free?
Xkey Plus is free to download, with no in-app purchases.
Is TB Reverb free?
TB Reverb costs $8.99, with no in-app purchases.
Which has better reviews, Xkey Plus or TB Reverb?
TB Reverb is rated higher. Xkey Plus averages 2.9 out of 5 from 13 ratings, while TB Reverb averages 4.8 from 55 ratings.
Do Xkey Plus or TB Reverb have ads?
Neither Xkey Plus nor TB Reverb shows ads.
Which is updated more often, Xkey Plus or TB Reverb?
Xkey Plus ships an update every 3 months, and TB Reverb every 2 months. Most recently, Xkey Plus was updated on October 23, 2026 and TB Reverb on October 25, 2026.

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