Room Impulse Response vs ChordUp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 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
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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
Verdict
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
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.
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.
| Parameter | Room Impulse Response | ChordUp |
|---|---|---|
| Price | $49.99 | $5.99 — better |
| Rating | — | 4.4 (41 ratings) — better |
| Positive reviews | 0.0% of reviews | 94.3% of reviews — better |
| Number of ratings | — | 41 — better |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 55 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | Dmitrii Klochkov |
Customer experience
Room Impulse Response
ChordUp
In-app purchases
Room Impulse Response
- Reference Curves Option$14.99
ChordUp
No in-app purchases
Questions
Is Room Impulse Response free?
Is ChordUp free?
Do Room Impulse Response or ChordUp have ads?
Which is updated more often, Room Impulse Response or ChordUp?
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