Pepp vs Relic Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pepp
Create electronic music with an intuitive rhythm and harmony engine, no prior musical knowledge required. Design unique sounds, save loops, and mix them live. Sync with other apps and hardware for expanded creative possibilities.
- Intelligent rhythm and harmony engine
- Twisted groovebox/arpeggiator/synthesizer
- Sixteen sliders and 16-step sequencer
- 160 memory slots for loops
- MIDI sync and sequencing
- Audiobus integration
- Ten synth and five drum oscillators
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"I love the spirit behind the concept. Definitely taking advantage of what can be designed these days. The fact that the controls have influence on each other makes for an extremely wide range of possible textures." -Geoff White "A lot of the musical automata apps out there sound like cheap cheese. This is gourmet cheese." -MuzikAppJunkie Pepp opens up the joy of electronic music making to everyone. Thanks to an intelligent rythm and harmony engine, no musical knowledge is needed. Pepp is immediate, intuitive and vastly musical by nature. Make electronic music like there's nothing to it! Pepp is very easy to use yet it can produce a vast range of sounds. Forget about boring factory sounds. Come up with your own mindbending loops in no time, store them in memory slots, mix them live and jam with your friends. Tweak all parameters to the extreme without destroying your original loops. This twisted groovebox/arpeggiator/synthesizer lets you quickly forge original electronic music using sixteen sliders and a sixteen step sequencer. Instantly save and recall your ideas without missing a beat. With 160 memory slots you're not likely to run out of storage. Pepp can also be synced via MIDI, played live from a MIDI keyboard or sequenced from your favorite DAW. Naturally, all sliders can be mapped to midi controllers. Pepp is also integrated with Audiobus so you can use it with all of your audiobus compatible apps! FEATURES AT A GLANCE Ten synth oscillators Five drum oscillators FM-synthesis Audiobus MIDI Clock in MIDI in (Notes and CC) MIDI Latch/Gate Intelligent arpeggiator Advanced rythm engine Lo-/Hi-pass Filter w/ Resonance Delay Samle and hold Instant resample/reloop Detune Portamento Reverb Gain Glissando Master octave +-2 Tempo multiplier Record and share loops via mail or SMS OSCILLATOR TYPES Sine Square Sawtooth Triangle Wavetable Noise LIMITATIONS Some key features are disabled in this FREE version of Pepp. The full version of Pepp can be unlocked from within the app by using in-app purchase. Been working hard for a long time to create Pepp. I hope you enjoy it and appreciate your support!
Relic Flow
Generate unique Lo-Fi rhythms, noise patterns, and drum loops using advanced synthesis algorithms. Explore billions of sound samples with intuitive controls and real-time audio recording. Perfect for musicians and sound designers seeking endless creative possibilities.
- Lo-Fi rhythm and drum loop generation
- Billions of unique sound samples
- Real-time audio recording to WAV
- Multiple input methods (on-screen, PC keyboard, MIDI)
- Export to WAV, SunVox, and text clipboard
- iOS Audio Unit Extension (AUv3) support
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Relic Flow is a generator of Lo-Fi rhythms, noise patterns and drum loops based on unique synthesis algorithms from NightRadio. More than 4 billion samples from the depths of the Mathematical Universe! Features: * search for new sounds with three buttons: next random set, edit code, previous set; each set of 12 sounds corresponds to a code of 8 characters; * three types of keyboards for live performing: on-screen buttons, PC keyboard, MIDI input; * several processing parameters + control via MIDI; * real-time audio recording to WAV (32-bit); * export to: WAV (one file or a set), SunVox (samples + effects in one file), text clipboard; * the LCK button freezes individual samples - they will not change during the search for new sets; * iOS Audio Unit Extension (AUv3). Double clicking on a parameter opens a window for setting the exact value. If you enable the Hold option, the notes will play endlessly, without reacting to key release (noteOff) events; turning the note on again works like turning it off; there are two ways to enable this option: 1) using the Hold parameter in the "MIDI Mapping" window; 2) by pressing the HOLD button, which appears in place of LCK while playing the musical keyboard: press HOLD, release the desired notes - then the released notes will continue to play.
Screenshots
Verdict
The clearest difference is review sentiment: Relic Flow at 93% against Pepp's 29%. Relic Flow also leads on in-app purchases (none vs 1) and rating (4.8 vs 4.6). Pepp's advantage is price (Free vs $1.99) and update cadence (every 6 months vs every 17 months). On ads and device support 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
Pepp is free to download; Relic Flow costs $1.99 up front. Pepp sells 1 one-off in-app purchase. Relic Flow asks for nothing beyond the download.
Relic Flow holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Relic Flow has 26 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 29% of Pepp's written reviews are positive against 93% of Relic Flow's.
Pepp ships an update every 6 months, Relic Flow every 17 months. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.
| Parameter | Pepp | Relic Flow |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.6 (5 ratings) | 4.8 (26 ratings) — better |
| Positive reviews | 29.2% of reviews | 93.3% of reviews — better |
| Number of ratings | 5 | 26 — better |
| Update frequency | Every 6 months — better | Every 17 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 4 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Patrik Hedmalm | Alexander Zolotov |
Customer experience
Pepp
Relic Flow
In-app purchases
Pepp
- Unlock Pepp$4.99
Relic Flow
No in-app purchases








