REPUN vs Seyfert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
REPUN
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REPUN is an analog-minded chorus and vibrato processor for iPhone and iPad. Use it as a standalone audio app or insert the included AUv3 effect in a compatible host such as GarageBand. Its sound is built around BBD-style delay behavior, band limiting, compander contour, and controlled waveform instability. The result moves with tonal weight instead of sounding like a clean digital modulation layer placed on top of the source. FEATURES - BBD-style chorus and vibrato character - Free-running or host-tempo-synced modulation - Continuous dry-to-chorus-to-vibrato Mix control - Adjustable Rate and Depth - LFO Wave shaping - BREEZE drift and random-motion control - Instrument and line input modes - 2x and 4x processing modes - Standalone iOS/iPadOS app - AUv3 audio effect for compatible hosts TRY BEFORE UNLOCKING The working release model assumes 10 minutes of full-featured active use, shared between the standalone app and AUv3 extension. A one-time, non-consumable In-App Purchase unlocks unlimited use in both formats, with Restore Purchases available in the standalone app. Confirm this behavior in the production build before submission. REPUN works on guitars, keyboards, synthesizers, pads, drones, and melodic layers that need width, instability, or animated pitch movement.
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: REPUN at Free against Seyfert's $1.99. Seyfert's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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
REPUN is free to download; Seyfert costs $1.99 up front. REPUN sells 1 one-off in-app purchase. Seyfert asks for nothing beyond the download.
| Parameter | REPUN | Seyfert |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 35 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Shoma Kondo | Konstantin Torsten Schutz |
In-app purchases
REPUN
- REPUN Full Version$6.99
Seyfert
No in-app purchases









