Comparison

SyndtSphere vs RingsFX

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

Head to head
About

SyndtSphere

Explore a novel approach to sound design with this synthesizer. Rotate a sphere with over 70 presets to discover ideal sounds, enhanced by a stereo ping-pong delay and global settings. It's AUv3 compatible for use within other music production apps.

Highlights
  • Spherical sound exploration
  • AUv3 plugin compatibility
  • High-quality audio engine
  • Stereo ping-pong delay
  • Legato mode with glide
Features
Read full description

This synthesizer offers a brand new way of finding the optimal sound. By rotating a sphere that consists of more than 70 professionally created states anyone can dial in the perfect sound. In addition to the sphere, a ping-pong delay and a few more global settings are available. SyndtSphere is based on the more traditional polyphonic synthesizer Syndt (also available on the App Store). A video demo is available at the developers website. Features: • AUv3 Compatible - use it as a plugin inside Garageband or any other AUv3 compatible host app. • High quality internal audio engine. • Stereo ping-pong delay • Optional legato mode with glide speed setting. Feedback or suggestions? Drop us a mail: support(at)klevgrand.se or @klevgrand on Twitter

About

RingsFX

This music app emulates a renowned physical modeling synthesizer, offering diverse synthesis techniques and polyphonic capabilities. It allows for real-time parameter manipulation and can process external audio, creating unique sonic textures and rhythms.

Highlights
  • Physical modeling synthesis emulation
  • Multiple polyphony modes (Mono, Duo, Quad, True Polyphonic)
  • Supports MIDI MPE and velocity sensitivity
  • External audio excitation
  • Mod Matrix for real-time parameter control
  • 7 unique synthesis modes
  • 6 mod-able and 6 global effects
Features
Read full description

RingsFX is an AUv3 plugin based on the famous Mutable Instruments Rings, one of the most dedicated and fully-featured Physical Modeling Eurorack modules ever created. At its core is a resonator that needs to be 'excited' or 'strummed' by MIDI input, noise, or external audio excitation. RingsFX emulates vibrations of structures simulated by 3 different synthesis techniques that can be plucked or process external signals: Modal Synthesis, Sympathetic Strings, and Inharmonic Strings. Traditionally, Rings was only monophonic but used a unique approach to polyphony that allowed the previous note to 'ring' out and decay while a new note was played. Rings FX provides these same modes (Mono, Duo, and Quad), but expands it with a true Polyphonic mode. RingsFX also expands the capabilities of the original engine by adding support for velocity sensitivity and MIDI MPE mode. The new polyphonic mode allows RingsFX to play up to 12 notes of true polyphony, depending on the settings. Doing so requires RingsFX to use multiple Rings resonators, but the more true polyphony you use, the more processing power it requires. Running in the traditional Monophonic, Duophonic, or Quadrophonic modes may be preferred in order to keep CPU usage under control. RingsFX has 7 modes in total, by combining the 3 basic modes with additional properties such as chords or specially tuned reverbs. The original hardware also had a secret 'Easter Egg' mode, which in RingsFX is simply calling 'Synthesizer' mode, rumoured to be based on one of the early Korg synthesis methods. This mode supported a number of mutable effects which now work on in all resonator modes. RingsFX also has a Mod-Matrix which allows you to combine the built-in LFOs and FEGs to great effect by manipulating parameters and mutable effects in realtime. Finally, RingsFX can be loaded as an AUv3 effect plugin. Set the Exciter Source to 'INPUT', and you can pass any audio through RingsFX and use this audio as an external exciter. For example, it can be used to great affect on a drum beat to create some crazy rhythms. Use the Output Mix to combine the original audio with the synthesised resonator output to create some stunning effects. Features ○ 7 unique synthesis modes. ○ Supports Mono, Duo, Quad and true polyphony. ○ Supports 2 fluid LFO's per note. ○ Up to 4 FEG's per note. ○ External Exciter modes. ○ White noise Pulse Sequencer. ○ Supports 6 mod-able effects and 6 global effects. ○ Mod Matrix ○ Input and white noise filters. ○ Program Manager with drag and drop. ○ Preset Search and Favourites. ○ Easy export and import of banks and presets. ○ Extensive help manual. ○ Web Transfer for backing up to PC/Mac. ○ MPE Support.

Screenshots

SyndtSphere4 screens
RingsFX4 screens

Verdict

The call

The clearest difference is review sentiment: RingsFX at 100% against SyndtSphere's 40%. RingsFX also leads on rating (4.9 vs 3.7) and update cadence (fortnightly vs every 23 months). SyndtSphere's advantage is price ($1.99 vs $14.99). On ratings volume, 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

SyndtSphere costs $1.99 and RingsFX $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RingsFX holds the better App Store score, 4.9 against 3.7. Both are backed by a comparable volume of ratings — 18 and 27 respectively. Written reviews point the same way: 40% of SyndtSphere's written reviews are positive against 100% of RingsFX's.

UpkeepUpdate frequency

SyndtSphere ships an update every 23 months, RingsFX fortnightly. The most recent releases landed on October 9, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
SyndtSphere versus RingsFX: the parameters behind the verdict, then further details
ParameterSyndtSphereRingsFX
Price$1.99 — better$14.99
Rating3.7 (18 ratings)4.9 (27 ratings) — better
Positive reviews40.0% of reviews100.0% of reviews — better
Number of ratings1827 — better
Update frequencyEvery 23 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size15 MB23 MB
Age rating4+4+
DeveloperKlevgrand Produkter AB4Pockets.com

Customer experience

SyndtSphere

All ratings18 ratings
Positive66.7%
Neutral5.6%
Negative27.8%
Written reviews15 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

RingsFX

All ratings26 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SyndtSphere

No in-app purchases

None

RingsFX

No in-app purchases

Questions

Is SyndtSphere free?
SyndtSphere costs $1.99, with no in-app purchases.
Is RingsFX free?
RingsFX costs $14.99, with no in-app purchases.
Which has better reviews, SyndtSphere or RingsFX?
RingsFX is rated higher. SyndtSphere averages 3.7 out of 5 from 18 ratings, while RingsFX averages 4.9 from 27 ratings.
Do SyndtSphere or RingsFX have ads?
Neither SyndtSphere nor RingsFX shows ads.
Which is updated more often, SyndtSphere or RingsFX?
SyndtSphere ships an update every 23 months, and RingsFX fortnightly. Most recently, SyndtSphere was updated on October 9, 2026 and RingsFX on October 20, 2026.

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