Comparison

Stone Echo vs FlangeII

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
Currently charting
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

FlangeII

This audio effect plugin offers a dual stereo flanger with a vintage sound. It provides flexible routing options like parallel and series, alongside adjustable rate, depth, width, and drive for a wide range of modulated effects. Soft limiting is included to prevent clipping.

Highlights
  • Dual stereo flanging
  • Vintage vibe
  • Parallel and series routing
  • Adjustable rate and depth
  • Stereo width control
  • Optional drive for warmth
  • Soft limiting for clipping prevention
Read full description

FlangeII Dual Stereo Flanger Plugin (AUv3) FlangeII is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic Pro, GarageBand or AUM. Overview FlangeII is a dual stereo flanging machine with a vintage vibe! As well as traditional super-wide stereo flanging effects, FlangeII can also produce all manner of swirly modulated goodness by running the independent flanging engines in parallel or series. Selectable modes allow quick access to finely-tuned settings under the hood that "just work", from subtle to extreme - just the thing if you find some flangers to be overly complex with too many parameters! Set Rate and Depth to taste, adjust the stereo Width, then you can even add some gritty Drive for some "analog" warmth. Controls Active - Bypasses the effect (Off) or selects one of the following processing modes: Stereo - Two independent flangers for the left and right channel, with LFOs 90 degrees out of phase for a stereo effect, determined by the Width control. Parallel - Two independent stereo flangers for the incoming audio, which are then summed together at the output stage. The LFOs for each of the four flangers are 90 degrees out of phase for a stereo effect, determined by the Width control. Series - Two independent stereo flangers with Flange I processing incoming audio, which is then passed on to Flange II for a double-helping of flangey goodness at the output stage! This is potentially the most dramatic flanging effect, especially with the Width set to maximum as each of the four flanger LFOs are 90 degrees out of phase. The following controls apply to each flanging stage, referred to as Flange I or Flange II: Flange I/II - Toggles the Flange I or Flange II processing engine On or Off. Rate - Sets the rate of the flanger LFO in Hz. Depth - Sets the depth of the flanging effect. Mode - Selects one of four different modes. Each mode configures several "under the hood" settings - think of each mode as a mini preset for internal parameters. Modes range from subtle (I) to extreme! (IV). The following controls are global: Width - Adjusts the stereo width from super-wide to monophonic. Note this only adjusts the "wet" flanged sound so your original stereo image remains intact for the "dry" signal. Drive - Applies an optional amount of warm overdrive to the flanger processing only, for a bit of a vintage vibe! Mix - Balances the processed audio with the incoming / dry signal. At zero, the output is totally dry, and at 100%, the output is totally wet and flanged to the max! The flanging effect can sometimes create loud resonant frequency peaks that could result in clipping. To protect against this, soft limiting is applied at both the flanging processing stage and at the final summed output. If the input levels are high, this can add to the "analog" like sound of FlangeII when compression and saturation occurs. About The UI Not everyone likes the UIs of my latest (2025) plugins - I get it. However, the simplistic and generic approach allows me to (a) 99% focus on the DSP, sound quality and CPU performance, and (b) significantly reduce the development (and potential maintenance) time, which is reflected in my pricing. For more info and support please visit: www.waverley-instruments.com/robjackson

Screenshots

Stone Echo2 screens
FlangeII4 screens

Verdict

The call

The clearest difference is rating: FlangeII at 5.0 against Stone Echo's 2.8. FlangeII also leads on update cadence (every 6 days vs every 38 months) and price ($1.99 vs $2.99). Stone Echo's advantage is chart position (#191 vs unranked) and ratings volume (4 vs 1). On ads, in-app purchases, monetization model and device support 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 FlangeII $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

FlangeII 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, FlangeII every 6 days. The most recent releases landed on August 14, 2026 and September 12, 2026 respectively.

Scorecard6 real differences · 5 level
Stone Echo versus FlangeII: the parameters behind the verdict, then further details
ParameterStone EchoFlangeII
Price$2.99$1.99 — better
Rating2.8 (4 ratings)5.0 (1 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 38 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#191 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS10.0 — better12.0
Further details — not scored
Size9 MB13 MB
Age rating4+4+
DeveloperAleksandar MlazevRob Jackson

Customer experience

Stone Echo

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

FlangeII

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

In-app purchases

None

Stone Echo

No in-app purchases

None

FlangeII

No in-app purchases

Questions

Is Stone Echo free?
Stone Echo costs $2.99, with no in-app purchases.
Is FlangeII free?
FlangeII costs $1.99, with no in-app purchases.
Which has better reviews, Stone Echo or FlangeII?
FlangeII is rated higher. Stone Echo averages 2.8 out of 5 from 4 ratings, while FlangeII averages 5.0 from 1 ratings.
Do Stone Echo or FlangeII have ads?
Neither Stone Echo nor FlangeII shows ads.
Which is updated more often, Stone Echo or FlangeII?
Stone Echo ships an update every 38 months, and FlangeII every 6 days. Most recently, Stone Echo was updated on August 14, 2026 and FlangeII on September 12, 2026.

Other comparisons