Comparison

strng vs TfxEcho

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

Head to head
About

strng

This app generates plucked string sounds using a physical modeling synthesis engine. It offers polyphonic voices, a built-in keyboard, and MIDI control. Shape your sound with delay and resonant filters, and integrate with other music apps.

Highlights
  • Physical modeling string synthesis
  • 16 voice polyphony
  • Built-in 25-key keyboard with aftertouch
  • MIDI controller support (USB/Wi-Fi)
  • Stereo ping-pong delay
  • Two-channel resonant filter with LFOs
  • Audiobus, IAA, and AUv3 support
Features
Read full description

Strng is a string synthesiser inspired by the karplus-strong algorithm. The physical modelling starts with a short burst of noise that then guided by a tuned delay buffer and string tension filter, generates plucked string like sounds. No samples are used. Strng is 16 voice polyphonic and can be controlled with an in app 25 key chromatic keyboard or connect prefered midi controller through USB or Wifi. To further shape the sound two post effects are available, a ping-pong stereo delay and two channel resonant filter controlled by two LFOs. Connect to other apps through AudioBus, inter app audio or load in DAWs as AUv3. +++ String synthesis engine +++ 16 voice polyphonic +++ Audiobus, IAA and AUv3 +++ Core MIDI, bluetooth midi and limited MPE +++ 25 multitouch keyboard with aftertouch control +++ Factory presets, save and load your own settings, drag'n drop from files app +++ Aftertouch modulation for attack, sustain, bit crush, resonant filter and detune lfo +++ Stereo ping-pong delay +++ Two channel resonant low pass filter LFOs

About

TfxEcho

This audio plugin offers a warm, dark echo effect inspired by analog delay units. It allows for adjustable delay times, feedback, and filters, with modulation capabilities and tempo syncing. The plugin captures high-frequency signals for a versatile sound.

Highlights
  • Echo and delay effect
  • BBD-inspired delay lines
  • Adjustable delay time (20-1200 ms)
  • Feedback control (0-100%)
  • Low-pass and high-pass filters
  • Modulation rate and width
  • Tempo sync
Features
Currently charting
Read full description

TfxEcho is an echo effect AudioUnit Extension plugin. It uses delay lines which are inspired by BBD (bucket brigade device). BBD is used in various analog delay unit and is known for its warm and dark sound. The delay line uses fixed length buffer and an artificial clock to sample input signal in variable sampling rate. When the delay time is changed, the delay line can produce pitch change effect which is similar to the behavior of the BBD based analog delay unit. The delay line is inspired by BBD, but it is not emulation of the any particular BBD. Unlike the typical BBD based delay unit, frequency range of the delay line is not limited. The delay line is capable to capture signal in higher frequency up to about 22KHz. Features AudioUnit Extension - Delay Time: From 20 ms to 1200 ms - Feedback: From 0 % to 100 % - Adjustable lowpass filter and high-pass filter. - Modulation rate: From 0.01 Hz to 10 Hz - Modulation width: From 0 ms to +/- 10 ms - Delay time can be synced to tempo provided by the host application. Host Application Host application uses system audio input as an audio source and processed audio signal is routed to the system audio output.

Screenshots

strng4 screens
TfxEcho2 screens

Verdict

The call

The clearest difference is chart position: TfxEcho at #185 against strng's unranked. strng's advantage is iOS requirement (9.0 vs 13.5). On price, rating, review sentiment and ratings volume 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

strng costs $4.99 and TfxEcho $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for strng against 4.7 for TfxEcho. Both are backed by a comparable volume of ratings — 35 and 12 respectively. Written reviews are what separate them: 84% of strng's written reviews are positive against 80% of TfxEcho's.

UpkeepUpdate frequency

strng ships an update every 4 months, TfxEcho every 3 months. The most recent releases landed on September 25, 2026 and September 20, 2026 respectively.

Scorecard2 real differences · 9 level
strng versus TfxEcho: the parameters behind the verdict, then further details
ParameterstrngTfxEcho
Price$4.99$4.99
Rating4.7 (35 ratings)4.7 (12 ratings)
Positive reviews84.4% of reviews — better80.0% of reviews
Number of ratings35 — better12
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#185 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better13.5
Further details — not scored
Size4 MB1 MB
Age rating4+4+
DeveloperErik SigthRyo Togawa

Customer experience

strng

All ratings35 ratings
Positive88.6%
Neutral8.6%
Negative2.9%
Written reviews32 reviews
Positive84.4%
Neutral9.4%
Negative6.3%

TfxEcho

All ratings12 ratings
Positive91.7%
Neutral0.0%
Negative8.3%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

strng

No in-app purchases

None

TfxEcho

No in-app purchases

Questions

Is strng free?
strng costs $4.99, with no in-app purchases.
Is TfxEcho free?
TfxEcho costs $4.99, with no in-app purchases.
Which has better reviews, strng or TfxEcho?
strng and TfxEcho are both rated 4.7 out of 5 on the App Store, from 35 and 12 ratings respectively.
Do strng or TfxEcho have ads?
Neither strng nor TfxEcho shows ads.
Which is updated more often, strng or TfxEcho?
strng ships an update every 4 months, and TfxEcho every 3 months. Most recently, strng was updated on September 25, 2026 and TfxEcho on September 20, 2026.

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