Comparison

Skulptur vs RackDocs

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

Head to head
About

Skulptur

This interactive filter instrument offers a unique way to manipulate sounds with touch-centric controls. Animate and sculpt your audio using 10 surgical filters with kinetic sliders and innovative gestures.

Highlights
  • 10-band surgical filters
  • Kinetic sliders
  • Touch-centric innovations
  • Built-in noise generator
  • LFO mode
  • Multiple UI modes
Features
Read full description

Skulptur is a highly interactive Performance Filterbank designed by Bram Bos and Berlin-based musician Hainbach. It's a 10-band filter instrument unlike any other filterbank you've ever used. Designed for touch with kinetic sliders and other touch-centric innovations, it brings lots of different ways to interact with your sounds. Swipe, throw, slide, push, pull and draw the 10 surgical filters to animate and manipulate your sounds in ways that no other plugin allows. Comes with plugins for iOS, iPadOS and MacOS (13+, Intel and ARM) - Multiple UI modes to play with your sounds - 10 steep, surgical 48dB filters (1 LP + 8 BP + 1 HP) with filter feedback - 4 Filterbank model configurations - Built-in noise generator and high quality input signal saturator - LFO mode, optionally tempo-synchronised - Real world tested as an instrument in numerous live performances by Hainbach Find the manual on ruismaker.com

About

RackDocs

Document your modular synth modules with photos, notes, and AI assistance. Track switch positions, LED behavior, and multi-step operations. Sync across devices and access a community library of module documentation.

Highlights
  • Photo-based module documentation
  • AI annotation extraction from manuals
  • Multi-context documentation
  • LED behavior tracking
  • Switch position guides
  • Community library access
  • Offline mode 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

Skulptur3 screens
RackDocs4 screens

Verdict

The call

The clearest difference is price: RackDocs at Free against Skulptur's $12.99. RackDocs also leads on update cadence (weekly vs every 2 months). Skulptur's advantage is in-app purchases (none vs 4) and device support (4 vs 2). 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

CostPrice · In-app purchases · Ads · Monetization

RackDocs is free to download; Skulptur costs $12.99 up front. RackDocs sells 4 in-app purchases, starting at $0.99 per month. Skulptur asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Skulptur against 5.0 for RackDocs. Both are backed by a comparable volume of ratings — 8 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Skulptur ships an update every 2 months, RackDocs weekly. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

Scorecard6 real differences · 4 level
Skulptur versus RackDocs: the parameters behind the verdict, then further details
ParameterSkulpturRackDocs
Price$12.99Free — better
Rating5.0 (8 ratings)5.0 (4 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings8 — better4
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13 — better18.0
Further details — not scored
Size3 MB31 MB
Age rating4+4+
DeveloperBram BosTheMM

Customer experience

Skulptur

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
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

Skulptur

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 Skulptur free?
Skulptur costs $12.99, with no in-app purchases.
Is RackDocs free?
RackDocs is free to download, with in-app purchases available.
Which has better reviews, Skulptur or RackDocs?
Skulptur and RackDocs are both rated 5.0 out of 5 on the App Store, from 8 and 4 ratings respectively.
Do Skulptur or RackDocs have ads?
Neither Skulptur nor RackDocs shows ads.
Which is updated more often, Skulptur or RackDocs?
Skulptur ships an update every 2 months, and RackDocs weekly. Most recently, Skulptur was updated on October 30, 2026 and RackDocs on November 9, 2026.

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