Comparison

Room Impulse Response vs ChordUp

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

Head to head
About

Room Impulse Response

Analyze the acoustic properties of rooms and loudspeakers. Record impulses or swept sines to generate Impulse Responses (IRs) and visualize various acoustic metrics like RT60, EDT, and clarity. Perform spectral analysis with FFT for detailed sound decay visualization.

Highlights
  • Record impulse or swept sine
  • Generate Impulse Response (IR)
  • View ETC with RT60 cursors
  • Analyze Schroeder curve (EDT, T10, T20, T30)
  • Spectral analysis with FFT
  • 3D waterfall plot for sound decay
Features
Read full description

Room Impulse Response measures audio characteristics of a room or loudspeaker. Start by recording an impulse, such as a handclap or balloon pop, or record a swept sine and use the built-in deconvolution to create your Impulse Response (IR). Now, view the ETC, with RT60 decay cursors, apply windowing if you wish, or trim the IR. Next, see these other graphs: ** Impulse, where you can play back the actual IR ** ETC, which includes cursors to read out RT60 times directly, and allows pinch-zoom gesture for trimming the file. Apple a window, and see the effects of the window on the ETC plot. ** Schroeder curve, with EDT, T10, T20, and T30 markers And then see these charts, all in either in Octave or 1/3 Octave bands: ** T20 or T30 (RT60) times ** Reverb Early Decay Times (EDT) ** Clarity C50 ** Clarity C80 ** CT times ** Definition ** Signal / Noise And then you can also do spectral analysis, using our FFT, which can be windowed, for analyzing loudspeaker response without reflections, or see the 3D waterfall plot to view the decay of sound in the room by frequency, over time. Works great with the internal iOS device microphone, or attach or iTestMic or iAudioInterface2 for fully professional results. See the other great apps by Studio Six Digital, including AudioTools.

About

ChordUp

This app is a musical instrument and MIDI controller that lets you play common chords instantly with a single touch. It offers multiple playing surfaces for chords, single notes, or strumming, and can control other music apps on the same or different devices.

Highlights
  • Instant chord selection with single touch
  • Play full chords, single notes, or strum
  • Control other music apps via MIDI
  • 108 available chords
  • 10 embedded instruments
  • Smart sustain and chord locking
Read full description

ChordUp is a musical instrument and MIDI controller that allows you to play almost any common chord instantly. No need to configure presets for each song. Just grab ChordUp and start playing. SELECT CHORDS WITH A SINGLE TOUCH Unique chord selector allows you to play any available chord instantly. You don't need to make any pre-configurations or presets. Just tap on the key button and slide your finger to the required chord type. With a little practice you will be able to select any chord in a fraction of a second. PLAY FULL CHORDS, SINGLE NOTES OR STRUM Three playing surfaces allows you to easily play any rhythm pattern: full chords, bass and chord, strumming or arpeggios. CONTROL OTHER APPS ON THE SAME DEVICE You can use ChordUp to control your favourite soft or hard synthesizer through Core MIDI connection or though Audiobus 3 MIDI ports. CONTROL APPS ON ANOTHER IOS DEVICE OR YOUR MAC ChordUp can send MIDI notes to another iOS device through a Bluetooth MIDI connection. If you want to control an App running on your Mac you can connect through Bluetooth, Wi-Fi or USB. FEATURES • 108 available chords (9 chord types for each of the 12 notes). • 10 embedded instruments: Acoustic Piano, Electric Piano, Guitar, Organ, Accordion, Vibraphone, Strings, 3 synth sounds. • 12 pads surface (for piano like parts) • 6 strings surface (for guitar strumming, power chords and arpeggios) • Expression pad surface (allows to play full chords and control an expression parameter at the same time) • Smart sustain. With the sustain enabled, when you switch chords, only the notes of the current chord that don't belong to the next chord are muted. • Octave transposition. • Chord locking. You can lock one chord type for a chord button. • Buttons size adjustment on iPad. • CoreMIDI support. • Audiobus support (Audio sender port, MIDI sender port)

Screenshots

Room Impulse Response4 screens
ChordUp4 screens

Verdict

The call

The clearest difference is review sentiment: ChordUp at 94% against Room Impulse Response's 0%. ChordUp also leads on price ($5.99 vs $49.99) and in-app purchases (none vs 1). On ads, monetization model, device support and iOS requirement 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

Room Impulse Response costs $49.99 and ChordUp $5.99 up front. Room Impulse Response sells 1 one-off in-app purchase. ChordUp asks for nothing beyond the download.

UpkeepUpdate frequency

Room Impulse Response ships an update every 5 months, ChordUp every 3 weeks. The most recent releases landed on September 16, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
Room Impulse Response versus ChordUp: the parameters behind the verdict, then further details
ParameterRoom Impulse ResponseChordUp
Price$49.99$5.99 — better
Rating—4.4 (41 ratings) — better
Positive reviews0.0% of reviews94.3% of reviews — better
Number of ratings—41 — better
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size55 MB30 MB
Age rating4+4+
DeveloperAndrew SmithDmitrii Klochkov

Customer experience

Room Impulse Response

Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

ChordUp

All ratings41 ratings
Positive82.9%
Neutral4.9%
Negative12.2%
Written reviews35 reviews
Positive94.3%
Neutral2.9%
Negative2.9%

In-app purchases

1 purchases

Room Impulse Response

One-time1
  • Reference Curves Option$14.99
None

ChordUp

No in-app purchases

Questions

Is Room Impulse Response free?
Room Impulse Response costs $49.99, and also offers in-app purchases.
Is ChordUp free?
ChordUp costs $5.99, with no in-app purchases.
Do Room Impulse Response or ChordUp have ads?
Neither Room Impulse Response nor ChordUp shows ads.
Which is updated more often, Room Impulse Response or ChordUp?
Room Impulse Response ships an update every 5 months, and ChordUp every 3 weeks. Most recently, Room Impulse Response was updated on September 16, 2026 and ChordUp on September 21, 2026.

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