Comparison

Stone Echo vs pOus

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

Head to head
About

Stone Echo

This app creates a unique echo effect with adjustable frequency modulation, inspired by Mayan pyramid acoustics. It offers musical and experimental soundscapes, functioning as a standalone application or an AUV3 plugin.

Highlights
  • Frequency changing echo effect
  • Phase modulated frequency
  • Standalone app and AUV3 plugin
  • Adjustable time, feedback, and level
  • UFO mode for experimental sounds
Features
Read full description

Echo effect Audio Unit V3 inspired by the mayan pyramids acoustic echo. I come up with a complex phase modulated frequency of the echo so you can change it’s frequency signature. It is kind of changing the material of the reflective surface and I called it “Stone F”. I have made the echo to sound more music friendly to me but there is button called “UFO” and if you press it the effect is more close to the mayan just shifting the frequency backwards (I liked that better). You can also control the feedback of the phase modulation. The effect can work as a stand alone app and as an audio unit AUV3 plug-in. Stone Echo is an effect that is heavy on the CPU Controls: - Time - time offset of the echo - Stone F - frequency response of the echo - Feedback - echo feedback - Level - the volume of the echo - UFO - heavy modulated echo

About

pOus

This app emulates analog drum machine bass drums with adjustable tuning and decay. It offers MIDI OUT functionality for envelope follower data and a scale mode for playing musical scales. Designed for musicians using AUv3 hosts.

Highlights
  • BassDrum emulation
  • Adjustable tune and decay
  • MIDI OUT envelope follower
  • Scale mode for musical notes
  • AUv3 instrument
  • MIDI CC routing
Read full description

Concept: The app is an AUv3 instrument that emulates the so-called “BassDrum” of analog drum machine. In addition it features MIDI OUT functionality of Envelop Follower, that is, the user can send out this instrument's unique envelop via midi CC for modulating external plugins. Also there is "scale mode" where the user can play "pOus" with musical scale like Bass. System Requirements: AUv3 host that has a flexible capability of MIDI routing (AUM, apeMatrix, etc) Usage: There are 9 sliders & one button. Tune: BassDrum’s fundamental frequency (30hz - 160hz). text-editable. Decay: determines its duration. Amp: audio’s decibel representation. MIDI OUT: whether the functionality of envelop follower is turned on or off (default: off) MIDI Gain: gain amount of MIDI out Offset: balances the output parameter’s value Channel: determines MIDI channel MIDI CC: determines the destination MIDI CC number. text-editable Scale Mode: This is a sort of Bass mode, that is, it can play musical scale in response to incoming MIDI notes. Button: triggers the instrument. Recommended Scheme: drum machine (MIDI out) -> “pOus” -> audio effect (compressor, saturator etc)

Screenshots

Stone Echo2 screens
pOus2 screens

Verdict

The call

The clearest difference is rating: pOus at 5.0 against Stone Echo's 2.8. pOus also leads on update cadence (every 4 months vs every 38 months). Stone Echo's advantage is ratings volume (4 vs 1) and iOS requirement (10.0 vs 12.0). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Stone Echo costs $2.99 and pOus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

pOus holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

Stone Echo ships an update every 38 months, pOus every 4 months. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Stone Echo versus pOus: the parameters behind the verdict, then further details
ParameterStone EchopOus
Price$2.99$2.99
Rating2.8 (4 ratings)5.0 (1 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 38 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better12.0
Further details — not scored
Size9 MB15 MB
Age rating4+4+
DeveloperAleksandar MlazevSatoshi Kajii

Customer experience

Stone Echo

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

pOus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stone Echo

No in-app purchases

None

pOus

No in-app purchases

Questions

Is Stone Echo free?
Stone Echo costs $2.99, with no in-app purchases.
Is pOus free?
pOus costs $2.99, with no in-app purchases.
Which has better reviews, Stone Echo or pOus?
pOus is rated higher. Stone Echo averages 2.8 out of 5 from 4 ratings, while pOus averages 5.0 from 1 ratings.
Do Stone Echo or pOus have ads?
Neither Stone Echo nor pOus shows ads.
Which is updated more often, Stone Echo or pOus?
Stone Echo ships an update every 38 months, and pOus every 4 months. Most recently, Stone Echo was updated on November 11, 2026 and pOus on October 30, 2026.

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