Tonic FX vs Seyfert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tonic FX
Create custom audio effect chains for your music. This app allows you to build and reorder a variety of effects, from distortion and modulation to time-based and dynamic processors, for use in standalone mode or with compatible music production hosts.
- Customizable effect rack
- Reorderable effect chain
- 24 built-in effects
- Standalone app and AUv3 plugin
- MIDI Learn for hardware control
- Tempo sync for time-based effects
- Preset library
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Thirty-four effects. One tap to add each one — and the order of the chain is yours. Tonic FX is the Tonic effects rack in an app of its own, focused and affordable — an Audio Unit (AU and AUv3) effect in GarageBand, Logic, AUM, Cubasis, Drambo and any host, and a standalone app that processes your microphone or line input. A RACK YOU BUILD — AND REORDER Every effect has its own on/off, grouped by category: add one with a tap, then drag the cards to rearrange the chain. The order is saved with the preset. THIRTY-FOUR EFFECTS • Drive — Overdrive, Distortion (hard, asymmetric and fuzz), Amp Sim with 6 models and cabinet, Wavefolder/Fuzz, Bitcrush, Ring Modulator and Lo-Fi/Vinyl. • Modulation — an 8-mode Chorus (vintage through string ensemble), a Phaser with four voicings, from the gentle 4-stage pedal to a slow 10-stage pad sweep, Flanger, Vibrato, Detune, Pitch Shifter/Harmonizer, Throb (the pulsing vibrato of the sixties) and Frequency Shifter. • Motion — a two-rotor Rotary cabinet, Auto-Pan, Tremolo, a Stereo Widener with a mono maker that keeps the bass centred, a Pedal Wah you can put under an expression pedal, and the Trance Gate, with a draw-your-own-rhythm mode. • Time — a tempo-syncable ping-pong Delay, with Wow and Sat for tape character; a Reverb with nine spaces: room, hall, cathedral, plate, spring, shimmer, cloud, gated and swell — plus Freeze, to hold a chord and play over it; Reverse, which plays back what you just played backwards; and Call & Response, which listens to your phrase and answers in the gap. • Dynamics & EQ — Compressor, Limiter, Noise Gate, De-esser, a musical 5-band EQ and a 12-band graphic EQ, each with eight one-tap starting points you can overwrite with your own. Compressor, gate, de-esser and limiter show how much they are holding, in dB. • Vocal — Voice, a whole vocal channel behind one knob: low cut, gate, de-esser, compressor and sheen, all in the right measure; and the Doubler, which simulates two or four voices singing along. • Filter — an Auto-Wah that breathes with your playing, always first in the chain. BUILT FOR PLAYING Full MIDI Learn maps any hardware knob to any control, including the from–to range for an expression pedal. Tempo sync from your host keeps delay and modulation in time. Colour-coded scenes A–F, a preset library with favourites, and factory presets to get started fast. A tactile "pro hardware" interface, native on iPhone, iPad and Mac. Thanks for playing with RSJB — made by musicians, for musicians! Follow what's new at www.rsjb.com.br
Seyfert
This music effect plugin creates unique echoes that orbit and revolve around the listener. It offers advanced control over pitch, depth, and tone for each echo, with a built-in reverb and EQ for a rich soundscape. It functions as a standalone app or an Audio Unit for music production software.
- Orbital echo generation
- Spin and Doppler pitch-bend effects
- 3D binaural imaging
- Octave shimmer and transpose
- Per-echo tone and drive
- Echo-focused reverb and EQ
- Standalone and AUv3 support
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Seyfert is a delay unlike your others: every echo spawns at its own place in an orbit around you, and the whole constellation slowly revolves. Turn up Feedback and you don't just add repeats, you spawn more echoes into the orbit, from a single tight slap to a dense, spiralling cloud. Spin revolves the whole field around you. Doppler bends the echoes in pitch as they whirl toward and away. 3D wraps them around your head on headphones. Lift the repeats an octave into crystalline shimmer, drop them a sub-octave for weight, or detune them into a chorus. A lush reverb blooms around the echoes, never the dry signal, so your source stays clear while the repeats dissolve into space. Features: - Orbital echoes, where Feedback sets how many circle you - Spin, from a gentle drift to a full whirl - Doppler pitch-bend as the orbit turns - 3D binaural imaging for headphones - Shimmer and transpose, up or down one octave (octaves, fifths, sub-octaves) - Per-echo Trail tone, tape Wobble, and Drive - Lush reverb applied to the echoes - Full 5-band EQ on the wet signal - Orbit and Ping-Pong patterns, tempo sync - 18 factory presets, plus save your own - Standalone app and Audio Unit (AUv3) for GarageBand, AUM, Logic, and more No accounts, no tracking, no data collected. Everything stays on your device.
Screenshots
Verdict
The clearest difference is price: Seyfert at $1.99 against Tonic FX's $9.99. Seyfert also leads on update cadence (every 2 days vs weekly) and iOS requirement (15.0 vs 17.0). On rating, review sentiment, ratings volume and ads 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
Tonic FX costs $9.99 and Seyfert $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Tonic FX against 5.0 for Seyfert. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Tonic FX ships an update weekly, Seyfert every 2 days. The most recent releases landed on October 10, 2026 and October 1, 2026 respectively.
| Parameter | Tonic FX | Seyfert |
|---|---|---|
| Price | $9.99 | $1.99 — better |
| Rating | 5.0 (3 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 3 — better | 2 |
| Update frequency | Weekly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Rubens Felicio | Konstantin Torsten Schutz |
Customer experience
Tonic FX
Seyfert
In-app purchases
Tonic FX
No in-app purchases
Seyfert
No in-app purchases









