Comparison

Saucillator vs RackDocs

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

Head to head
About

Saucillator

Create and play custom synthesizers and instruments on your mobile device. Manipulate oscillators and effects with touch, record live loops, and design unique sounds with a variety of timbres and customizable effects. Supports AUv3 for use in other music production apps.

Highlights
  • Custom synthesizer creation
  • Touchscreen oscillator manipulation
  • Live looping and recording
  • AUv3 instrument support
  • Multi-track looper and beat generator
  • Parametric EQ and filters
  • MIDI controller support
Features
Read full description

Musical inspiration at the touch of your fingertips - from doodle to zen in seconds. Inspired by the Korg Kaossilator and Moog synthesizers, Saucillator transforms mobile devices into a platform for creating, playing, and sharing digital synthesizers. Users use the touchscreen to manipulate oscillators and effects, and can also do live-looping and recording. Our goal is to be beginner friendly while at the same time offering all the deep, complex features traditional synth users love. Saucillator also now supports AUv3 so you can use many of its features in AUv3-supported host applications (tested with AUM, Loopy Pro, Garageband. Note that some host applications only support some output). A multi track looper and beat generator are available to create synth loops and synchronize a beat/click track alongside it. Loops can be modified, toggled, and added as you're playing. Users are able to play custom modular synthesizers using the x-y axes of the touchscreen. The x-axis corresponds to amplitude (volume) and the y-axis corresponds to frequency (pitch). Playback can also be looped, recorded, and EQed using a Parametric EQ. On top of performing, users are able to create their own custom synthesizers, which consist of a custom timbre and user-defined effects. A variety of timbres are included: Sine, Square, Saw, Pulse, Noise, Theremin, "Singing Saw", "Electric Eel", and "Starslide" (among many more). These, as well as any user-created synths, can be mixed and matched at different harmonics, amplitudes, and phases to create custom sounds. Each synth has customizable fx parameters as well, including Envelope (ADSR - attack & release), Vibrato LFO (rate & depth), Tremolo, Reverb, Delay, Chorus, Distortion, Parametric EQ, and Note Lag (Portamento). We also include a Filter (low-pass, highpass, bandpass) that can be modulated using an Envelope or LFO. Custom synths can also be shared with the Saucillator community via an easy built-in sharing tool. Download other users' synths or upload your own, all from in app! Other abilities: -Choose scale: Pentatonic, Major, Minor, Blues, or Chromatic (among others). -Choose the base note for the pad. -Control the grid size. -Record to disk. -Live visualization of waveforms. -Play synths with external midi controllers -AUv3 instrument support Special thanks to Garrett Langley (http://dribbble.com/glangley) for helping with design and general usability. Saucillator. I think it's the sauce, boss!

About

RackDocs

Document your modular synthesizer modules with photos and detailed notes. Capture every switch position, LED behavior, and hidden feature. Sync across devices and access your documentation offline.

Highlights
  • Photo-based module documentation
  • AI annotation extraction from manuals
  • Multi-context documentation
  • LED behavior tracking
  • Switch position guides
  • Community library of documented modules
  • Offline access and iCloud sync
Features
Read full description

Remember When You Knew What Everything Did? You know the feeling. You're three hours deep into a patch on your Eurorack (or Buchla, or Serge, or 5U rig), riding that creative flow, when you can't remember if that switch toggles the quantizer or unlocks some hidden LFO mode you discovered last month at 2 AM. Or worse, you finally saved up for that complex module everyone raves about. The manual is 87 pages of dense tables. There's a switch upper left. And three knobs. A mysterious LED that blinks in morse code. You patch something, it sounds incredible... then forget how you got there. RackDocs was born from exactly these moments. Built by someone staring at their rack, trying to remember what switch position enables through-zero FM. YOUR RACK, ACTUALLY DOCUMENTED Forget dusty manuals and half-remembered forum posts. Take a photo of your module, mark it up with everything you discover, build your own personal wiki. Every hidden feature. Every switch position. Documentation on your terms. Works with Eurorack, 1U, 5U/MU, Serge, Buchla, and more. BUILT FOR EXPLORATION • NEW: AI annotation extraction—point at a manual or PDF, get all controls identified automatically • Photo-based—faceplates are already the perfect reference • Auto-snap to controls (tap near a jack or knob, circles detected automatically) • Smart image editing (crop that cluttered desk out) • Import specs from ModularGrid (why type HP and mA manually?) • Multi-format support (3U, 1U, 5U, Serge, Buchla—we don't discriminate) • Annotation tools that make sense DOCUMENT EVERYTHING YOU DISCOVER • 12 annotation types for every control (not just "knob goes brr") • Multi-context documentation (Normal Mode vs. Secret Alt Firmware Mode) • LED behavior tracking (solid/blinking/pulsing/existential crisis) • Switch position guides (up = quantized, down = chaos, center = ???) • Multi-step operation notes (tap this while holding that) • Copy/paste annotations CURATED NEWS FEED • Eurorack news, videos, and new module releases - all in one place COMMUNITY LIBRARY • Many modules documented by fellow patch nerds • Share your discoveries • Vote on documentation (yay or meh) • Verified accounts prevent random chaos SYNC EVERYWHERE, WORK OFFLINE • iCloud sync across iPhone, iPad, and Mac (patching happens everywhere) • Full offline mode (studio has no WiFi anyway) • Your data stays yours (unless you decide different) ORGANIZE THE BEAUTIFUL CHAOS • Search by name, manufacturer, or custom tags • Sort however your brain works • Export cheat sheets as PDFs or images (print them, share them, flex on Instagram) PRICING Start free with 5 modules, 5 community downloads and 5 exports. Try it, see if it fits your workflow. If you like it: • Monthly - No commitment. Cancel anytime. • Yearly - Best value. Less than a patch cable. • Yearly Supporter - Locks your price forever. New features, same rate. For those who hate price increases. Supporter badge! • Lifetime - Pay once, own forever. No subscriptions, no renewals. Support indie development, not investors. Why subscriptions? Servers cost money. Development costs time. This keeps the lights on and lets me build what you need. WHO MADE THIS? A modular enthusiast tired of scribbling notes at 3 AM. Someone who's bought complex modules, discovered secrets over weeks, then forgot everything after a creative break. PERFECT FOR: • Beginners drowning in manuals and tutorials • Live performers needing instant reference (no PDFs on stage) • Collectors managing systems too big to memorize • Gear heads who RTFM and want to share knowledge • Anyone who's thought "this module did something cool last week" Download RackDocs. Document your discoveries. Patch with confidence. Your rack is unique. Your documentation should be too. Screenshots show the app documenting third-party hardware. Module designs © their respective manufacturers. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Saucillator4 screens
RackDocs4 screens

Verdict

The call

The clearest difference is in-app purchases: Saucillator at none against RackDocs's 4. Saucillator also leads on ratings volume (33 vs 4) and iOS requirement (15.0 vs 18.0). On price, rating, review sentiment and update cadence 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

Both are free to download. RackDocs sells 4 in-app purchases, starting at $0.99 per month. Saucillator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Saucillator against 5.0 for RackDocs. That said, the two scores are not equally well evidenced: Saucillator has 33 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 92% of Saucillator's written reviews are positive against 100% of RackDocs's.

UpkeepUpdate frequency

Saucillator ships an update every 8 days, RackDocs every 5 days. The most recent releases landed on September 29, 2026 and September 26, 2026 respectively.

Scorecard4 real differences · 6 level
Saucillator versus RackDocs: the parameters behind the verdict, then further details
ParameterSaucillatorRackDocs
PriceFreeFree
Rating4.9 (33 ratings)5.0 (4 ratings) — better
Positive reviews92.3% of reviews100.0% of reviews — better
Number of ratings33 — better4
Update frequencyEvery 8 daysEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size93 MB29 MB
Age rating4+4+
DeveloperGreen Noise LLCTheMM

Customer experience

Saucillator

All ratings33 ratings
Positive97.0%
Neutral3.0%
Negative0.0%
Written reviews13 reviews
Positive92.3%
Neutral7.7%
Negative0.0%

RackDocs

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Saucillator

No in-app purchases

4 purchases

RackDocs

Subscriptions3
  • Monthly Subscription$0.991 Month
  • Yearly Subscription$3.991 Year
  • Yearly Supporter$8.991 Year
One-time1
  • Lifetime Access$44.99

Questions

Is Saucillator free?
Saucillator is free to download, with no in-app purchases.
Is RackDocs free?
RackDocs is free to download, with in-app purchases available.
Which has better reviews, Saucillator or RackDocs?
RackDocs is rated higher. Saucillator averages 4.9 out of 5 from 33 ratings, while RackDocs averages 5.0 from 4 ratings.
Do Saucillator or RackDocs have ads?
Neither Saucillator nor RackDocs shows ads.
Which is updated more often, Saucillator or RackDocs?
Saucillator ships an update every 8 days, and RackDocs every 5 days. Most recently, Saucillator was updated on September 29, 2026 and RackDocs on September 26, 2026.

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