Comparison

Transposer Pro vs SploshBox

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

Head to head
About

Transposer Pro

Features
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This app is designed to show how a note written for a given instrument (e.g. a Clarinet in Bb) would be written on another instrument (e.g. a Horn in F). - Intended for music students, conductors, composers and anybody who wants to get quicker at reading scores - Choose from over 100 instruments to transpose - many with configurable keys and clefs - Use the slider to interactively see the result of the transposition - Includes info on instrument ranges and transposition properties - Supports 4 clefs (automatically selected based on instrument conventions and register) - Includes guidance on the fundamentals of reading transposing instruments - Supports dark and light themes

About

SploshBox

This audio effect plugin offers vintage-style digital reverb with a unique "freeze" function for infinite sustain. It allows for extensive customization of reverb decay, stereo width, and filtering, all while being CPU-efficient.

Highlights
  • Vintage-flavoured digital reverb
  • Infinite sustain "freeze" effect
  • Adjustable reverb decay time
  • Stereo width control
  • Low-pass filter for reverb tone
  • Mix dry and wet signals
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SploshBox Reverb / Sustainer (AUv3) SploshBox is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic or GarageBand. Overview SploshBox is vintage-flavoured digital reverb that also allows you to "freeze" the reverb tail for infinite sustain effects. The early generation of hardware digital reverbs had a slightly grainy and "unnatural" quality to them due to limited CPU and RAM. SploshBox has similar tonal characteristics, but while being kind to your CPU, it also features up to one minute of reverb decay time! Or, infinity when you engage freeze mode... Parameters Active - Toggles the effect On or Off. When SploshBox is turned Off, any reverb will continue to decay, similar to "trails mode" found in many effects pedals. Delay - Sets a pre-delay time before the incoming audio is passed on to the reverb DSP. This can be used creatively so that the initial attack / transients of a sound are preserved and not "smeared" by the reverb tail for example. Decay - Sets the overall decay time for the reverb tail. This is calculated as the time for a 0dB impulse to decay to -60dB. Typically, unless the incoming signal is 0dB, the actual decay time may appear a little shorter before it hits -60dB. Spread - Sets the stereo width of the generated reverb from totally mono, to very stereo-tastic! LPF - Sets the cutoff frequency of a lowpass filter on the generated reverb. Reduce this parameter to make the reverb effect warmer / softer. Mix - Adjusts the balance between the dry incoming audio, and the wet generated reverb, from completely dry to 100% wet. Freeze - Engages the reverb freeze effect so that whatever is in the reverb buffers will sustain continuously. By toggling Freeze in and out, very interesting creative and drone effects can be achieved, especially when assigning the parameter to a MIDI controller. Please note that when Freeze is On, reverb will not be applied to your dry input signal - it's as if the reverb is frozen in that moment. SploshBox does not store "frozen" audio between sessions, so if Freeze mode is On when restoring a session, you won't hear any reverb. If the name sounds familiar, SploshBox is a version of the SPLOSHBOX module developed for Voltage Modular by Waverley Instruments. For more info and support please visit: www.waverley-instruments.com/robjackson

Screenshots

Transposer Pro4 screens
SploshBox3 screens

Verdict

The call

The clearest difference is update cadence: SploshBox at daily against Transposer Pro's every 11 months. SploshBox also leads on device support (4 vs 2) and iOS requirement (12.0 vs 16.3). Transposer Pro's advantage is price ($0.99 vs $1.99). On 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

Transposer Pro costs $0.99 and SploshBox $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Transposer Pro ships an update every 11 months, SploshBox daily. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

Scorecard4 real differences · 6 level
Transposer Pro versus SploshBox: the parameters behind the verdict, then further details
ParameterTransposer ProSploshBox
Price$0.99 — better$1.99
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 11 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS16.312.0 — better
Further details — not scored
Size3 MB12 MB
Age rating4+4+
DeveloperMatt WelchRob Jackson

In-app purchases

None

Transposer Pro

No in-app purchases

None

SploshBox

No in-app purchases

Questions

Is Transposer Pro free?
Transposer Pro costs $0.99, with no in-app purchases.
Is SploshBox free?
SploshBox costs $1.99, with no in-app purchases.
Do Transposer Pro or SploshBox have ads?
Neither Transposer Pro nor SploshBox shows ads.
Which is updated more often, Transposer Pro or SploshBox?
Transposer Pro ships an update every 11 months, and SploshBox daily. Most recently, Transposer Pro was updated on October 3, 2026 and SploshBox on October 11, 2026.

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