Echochops vs SquareAcid
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Echochops
This app creates a feedback delay effect on sounds from your device's microphone, mimicking an echo. It allows for creative musical patterns and ambient sound experiences through adjustable delay times and filters. Experiment with various audio effects for both musical and experimental purposes.
- Adjustable delay time up to 60 seconds
- Feedback rate control
- Four audio filter types
- Parameter control via tilt and rotation
- Glitch and Funny delay modes
- Background audio playback
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The extreme delay machine that you've never heard before. In short: This is a Karaoke echo machine. Words spoken in the iPhone's microphone will come back a few seconds later. It's like the echo effect you can hear at a mountain. You can get various kinds of effects by changing the delay time and the feedback rate. To make music: Tap on the table - it sounds like "tock"......"tock"....."tock"..... Clap your hands - you'll hear "tock", "clap", "tock", "clap", "tock", "clap"... You can produce simple musical patterns this way. Daily life use: Leave it as it is. It's fun to hear repeating sounds of ordinary life. You can use the stereo headset with the mic. Take a walk with the iPhone in your pocket and enjoy the repeating sounds around you. In detail: "Echochops" produces a feedback delay effect (an echo effect) on the sounds from the iPhone's microphone. The feedback delay is widely used to produce rich vocal and guitar sounds. It is also used as a special kind of musical performance. You can use "Echochops" not only as a "musical" application but also as a "noisy" experiment. Features: - Input and output level meter - Input and output level setting - Delay time setting, within 60 seconds. - Feedback rate setting, from 0% to 100% - Direct and Delay balance setting - Four types of audio filters (Lowpass, Highpass, Bandpass, Notch) - Audio filter frequency setting - Audio filer Q setting - Parameter control by audio input/output levels - Parameter control by tilting - Parameter control by rotating (a compass-equipped device only) - Mode setting to change delay time, "Glitch" or "Funny". - Output route setting, headphone/receiver or speaker. - Tilt angle setting for controlling - Upside-down portrait mode for efficient use of microphone and speaker - Delayed sound can be erased - Works with iPod audio simultaneously - Background audio playback (iOS 4.0 and later) [[ ATTENTIONS ]] Due to a latency of an audio input and output, the actual delaying time will be slightly longer than the setting. A natural feedback through the air may happen because the microphone and speaker are placed closely on the iPhone. Distorted sounds or harsh grating noises will be produced depending of the setting of parameters. It would be better NOT to use this application if you cannot stand noisy sounds. [[ Address of Gratitude ]] Thanks to Mr. Kaoru Sato (EP-4)
SquareAcid
This app is a unique acid synthesizer inspired by classic hardware. It offers a distinct sound with growls and barks, functioning as a standalone application with Audiobus and Ableton Link support, as well as an AUv3 plugin.
- Hardware-inspired acid synthesis
- Standalone application
- Audiobus support
- Ableton Link integration
- AUv3 audio unit plugin
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It’s not an emulation or simulation of the TB-303 synth. It is an homage to TB-303, and other hardware synths. It’s a complete different beast, but it has the same functionality. It growls and barks with fierce resonance. SquareAcid is a singular squeal, squelch, and bleep machine. It comes as a stand alone app with Audiobus and Ableton Link. It also comes with an AUv3 audio unit plug-in. Features: Audiobus Ableton Link IAA AUv3
Screenshots
Verdict
The clearest difference is rating: SquareAcid at 4.3 against Echochops's 3.6. SquareAcid also leads on update cadence (weekly vs every 15 months) and ratings volume (15 vs 5). Echochops's advantage is price ($0.99 vs $6.99). On review sentiment, ads, in-app purchases and monetization model 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
Echochops costs $0.99 and SquareAcid $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SquareAcid holds the better App Store score, 4.3 against 3.6. Both are backed by a comparable volume of ratings — 5 and 15 respectively. Written reviews point the same way: 63% of Echochops's written reviews are positive against 67% of SquareAcid's.
Echochops ships an update every 15 months, SquareAcid weekly. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | Echochops | SquareAcid |
|---|---|---|
| Price | $0.99 — better | $6.99 |
| Rating | 3.6 (5 ratings) | 4.3 (15 ratings) — better |
| Positive reviews | 62.5% of reviews | 66.7% of reviews — better |
| Number of ratings | 5 | 15 — better |
| Update frequency | Every 15 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Vision Pro | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Masayuki Akamatsu | James Navarro |
Customer experience
Echochops
SquareAcid
In-app purchases
Echochops
No in-app purchases
SquareAcid
No in-app purchases









