KeyStage vs TB Reverb
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyStage
This app acts as a master controller, AUv3 host, and audio mixer for keyboard players. It allows simultaneous control of multiple hardware and software instruments via MIDI, with advanced mapping, scripting, and audio mixing capabilities.
- Connect multiple MIDI controllers to instruments
- Load AUv3 instruments, effects, and MIDI processors
- Create complex keyboard splits and layers
- Advanced MIDI mapping and scripting
- Audio mixer with volume and pan control
- Play and automate audio files
- View PDF and JPG files
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TRY THE FREE LITE VERSION: https://apps.apple.com/us/app/keystage-lite/id1437899019 KeyStage is a master controller, AUv3 host, and audio mixer app designed mainly for keyboard players. With KeyStage, you can simultaneously control any number of hardware and software instruments using any number of MIDI controllers in an organized way. Each project consists of sections (which corresponds to sections of a song). In each section you can change sounds and sound parameters of connected instruments, create complex splits and layers of your keyboard(s), change the functionalities of sliders/knobs/pedals of your MIDI controllers by creating advanced MIDI mappings, write your own scripts, view PDF and JPG files (e.g. sheet music) and lyrics, and much more. LIST OF FEATURES • Connect any number of MIDI controller to any number of MIDI instruments by creating tracks. • Load AUv3 instruments, effects, and MIDI Processors. • Assign any region of your keyboard(s) to any connected instrument. • Change velocity curve and velocity limits, and create velocity splits and layers. • Transpose notes and restrict notes to any key using pitch shifter. • Create mixer units to combine audio signals, turning KeyStage into an audio mixer. • With the player units, you can play wav, mp3, and m4a files, add marker points, automate actions (like play, stop, move to a marker etc.) using custom translators, or trigger certain events (like changing sections) when the player reaches a certain marker. • Input units allows you to use the microphone input, or the hardware inputs of a connected audio interface. • The Main Mixer view allows you to control volume levels and pans of all tracks, connect effect units, and connect units to mixer units. • Create instrument presets to easily change sounds of instruments by choosing patch names from patch lists. • KeyStage can also import Cubase Patch Scripts to automatically create instrument presets for your MIDI instruments. • KeyStage automatically detects new MIDI connections and recommends matching instrument presets from a database. • Simulate auto-sustain on any connected instrument. • KeyStage has a multi-track recorder, which lets you record any number of tracks simultaneously. • Change or filter any MIDI signal using custom translators. Use “Relative Control” switch to smoothly change the parameters of your instruments without any jumps. • Use XY control unit to send control change and pitch bend messages to any connected MIDI instrument. • Create setlists, quick access all the songs in a setlist from a setlist bar, move to previous/next songs from live console or using external MIDI. • Create virtual MIDI inputs/outputs for KeyStage. • Use virtual MIDI piano controller to play connected instruments. • View PDF and JPG files. Link any page or region of any file to any section. • Backup and restore your songs and global properties to Dropbox. • Map special actions (like changing octaves, switching sections, changing pages of a PDF file) to notes and controllers using custom translators. • You can write your own scripts in custom translators, which opens up endless possibilities. • Use MPE routing to control any MIDI instrument using MPE controllers like Seaboard. Use custom translators to change the functionalities of each MPE dimension. • KeyStage supports smooth transitions between sections. Pressed notes will continue to sound when you switch sections. You can access demo videos and video tutorials on my Youtube channel.
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 price: TB Reverb at $8.99 against KeyStage's $29.99. TB Reverb also leads on in-app purchases (none vs 7) and device support (3 vs 1). On rating, review sentiment, ratings volume and update cadence 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
KeyStage costs $29.99 and TB Reverb $8.99 up front. KeyStage sells 7 one-off in-app purchases. TB Reverb asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for KeyStage against 4.8 for TB Reverb. Both are backed by a comparable volume of ratings — 41 and 55 respectively. Written reviews are what separate them: 91% of KeyStage's written reviews are positive against 94% of TB Reverb's.
KeyStage ships an update every 3 months, TB Reverb every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | KeyStage | TB Reverb |
|---|---|---|
| Price | $29.99 | $8.99 — better |
| Rating | 4.7 (41 ratings) | 4.8 (55 ratings) — better |
| Positive reviews | 91.0% of reviews | 94.3% of reviews — better |
| Number of ratings | 41 | 55 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 61 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Ali Gokturk | ToneBoosters |
Customer experience
KeyStage
TB Reverb
Bugs and requests
KeyStage
Reported bugs
7 issues- Custom Translators Database not downloading
- Snap to grid on wave files not lining up
- Song switching via MIDI channels not working
- App crashes when trying to use instruments Database (older iOS)
- Occasional crashes
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- Bluetooth MIDI requires another app
- App still asks for more money to unlock features after purchase
Requested features
12 requests- More complete user manual with troubleshooting
- Beginner's explanation of MIDI and AUv3
- MIDI Clock In + Seq Sync
- Global Tap Tempo
- In-line FX bypass (MIDI mappable)
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- Bus Mix Assignment for dynamic routing
- Better integration with apps like Animoog
- Midi FX like chord trigger, arpeggiator
- Include sounds from common synth apps
- Dark mode option
- More comprehensive tutorials
- Improve UI/UX
TB Reverb
Not enough reviews yet to summarise bugs or requests.
In-app purchases
KeyStage
- Instrument UnitsFree
- Effect UnitsFree
- Player, Input, and Mixer UnitsFree
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- MIDI UnitsFree
- Small Tip$0.99
- Medium Tip$3.99
- Large Tip$9.99
TB Reverb
No in-app purchases








