FAC Gravity vs ihapiNES
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Gravity
Create unique audio effects like Barberpole glissandos, spectral illusions, and evolving echoes. This frequency shifter offers stereo or mono processing with customizable feedback loops and modulation for dynamic sound design.
- Barberpole glissandos and spectral illusions
- Stereo or mono frequency shifting
- Spiral feedback loop with delay and filtering
- Modulation matrix with LFO and envelope follower
- Tempo-synced or MIDI-driven effects
- Dry/wet mix and optional limiting
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FAC Gravity AUv3 Plugin is a frequency shifter for creating Barberpole and Shepard style glissandos, spectral illusions, stereo rotation, chorusing, phasing, evolving echoes, infinite cosmic spaces, and all the combinations you’ll make. The plugin gives you two ways to process the audio source. In Stereo mode, each channel is shifted independently, with a Ratio control determining how closely their frequency shifts align. In Mono mode, FAC Gravity extends the internal quadrature processing to create a wide stereo image from the mono source. The frequency shift can move up or down, from subtle to more extreme spectral transformations. You can set the amount in Hz for classic Bode-style frequency shifting, make it follow your host tempo for rhythmic patterns, or even control it from MIDI notes for a more hands-on approach. A new dimension appears when you let the shifter feed back into itself with Spiral, a customizable loop with delay, blur, filtering, and different characters that shape how the sound circles, smears, interacts, and evolves over time. The result can range from bubbling textures to infinite sustained tones and noisy analog self-oscillation. Each character takes the feedback somewhere different. To dive deeper into new sonic dimensions, FAC Gravity comes with its own modulation module. The LFO, envelope follower, and flexible modulation matrix let you animate most parameters, from subtle evolving movements to complex, rhythmically reactive changes. You can even make the stereo field animate and rotate continuously by making the Width, Phase, and Pan parameters spin! You can shape the effect further by blending the processed signal with the original, while the optional limiter keeps the most extreme combinations in check. • Barberpole glissandos, spectral illusions, rotating stereo, evolving echoes • Dual Frequency Shifting, or Mono Shifting with Quadrature Stereo Widening • Organic Spiral Loop, from gentle feedback to pure analog self-oscillation • Integrated delay, diffusion blur, and independent low/high filtering • Modulation matrix, multi-source envelope follower • LFO with classic waveforms and random spline • Spinning modulation to rotate and animate the stereo field • Tempo-synced or MIDI-driven Frequency Shift, LFO, and Delay • Dry/Wet mix, optional limiting, and goniometer visualization • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro The documentation is available at fredantoncorvest.com/FAC_Gravity.html This is an AUv3 Effect and requires a compatible host to work The in-app purchases are for tipping only, the app is fully functional without them
ihapiNES
Create chiptune music with a pocket-sized groovebox. Emulates classic NES sounds with four tracks for bass, voices, and drums. Offers hands-on sequencing, performance effects, and MIDI input.
- Four-track sound engine (bass, 2 voices, drums)
- Realistic NES emulation for authentic chip sounds
- Hands-on sequencing with live recording
- Performance effects like arpeggios and vibrato
- Standalone app and AUv3 instrument
- MIDI input for external control
- Ableton Link for network jamming
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ihapiNES — Hardware roots. Pocket chiptunes. Built upon the original battery-powered Twisted Electrons hapiNES, ihapiNES brings the little hardware groovebox to your iPhone—built directly from its original firmware, with its distinctive chip sound and hands-on sequencing intact. Its sound engine draws on a realistic NES emulation core for more authentic triangle and pulse tones, bringing extra detail and character to that unmistakable NES sound. Triangle bass, two square-wave voices and a punchy drum track come together in a pocket-sized playground for melody and rhythm. Shape your sound with arpeggios, pulse-width tweaks and vibrato, then bring it to life with slides, swing and playful performance effects. Start with 16 factory grooves, from spacious melodies to busy chip jams. Write each track step by step, record notes live, or chain patterns and key changes into evolving arrangements. Build a beat, find a bassline and let the little square waves sing. Play standalone or load ihapiNES as an AUv3 instrument in your favourite host. Each plugin instance keeps its own patterns and sound settings, with optional host transport following and independent Run control. • Four tracks: triangle bass, two square voices and drums • 16 editable patterns with slides, swing and live recording • Pattern chaining and recorded key changes • Arpeggios, vibrato, pulse-width control and performance effects • Kick drums, snares, hats, toms, crashes and quirky effects • MIDI input: play the selected track or address each voice separately • Standalone app and AUv3 instrument, designed exclusively for iPhone • Floating-point mixing with extra headroom and warm volume-knob saturation • Tactile haptic feedback in standalone mode • Ableton Link for jamming with apps and devices on the same network • Life slider for live rhythmic variations without rewriting your patterns • Illustrated playing guide and printable cheat sheet Your little chip music machine—reborn for iPhone.
Screenshots
Verdict
The clearest difference is rating: FAC Gravity at 4.9 against ihapiNES's 3.0. FAC Gravity also leads on chart position (#167 vs unranked) and ratings volume (8 vs 2). ihapiNES's advantage is in-app purchases (none vs 3) and price ($2.99 vs $9.99). On ads, monetization model 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
FAC Gravity costs $9.99 and ihapiNES $2.99 up front. FAC Gravity sells 3 one-off in-app purchases. ihapiNES asks for nothing beyond the download.
FAC Gravity holds the better App Store score, 4.9 against 3.0. Both are backed by a comparable volume of ratings — 8 and 2 respectively.
| Parameter | FAC Gravity | ihapiNES |
|---|---|---|
| Price | $9.99 | $2.99 — better |
| Rating | 4.9 (8 ratings) — better | 3.0 (2 ratings) |
| Number of ratings | 8 — better | 2 |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Best chart rank | #167 — better | — |
| Devices | iPhone, iPad, Mac — better | iPhone |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | Twisted-Electrons |
In-app purchases
FAC Gravity
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99
ihapiNES
No in-app purchases









