Comparison

Battalion vs RackDocs

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

Head to head
About

Battalion

This advanced music production tool offers a powerful drum machine with extensive synthesis, sampling, and sequencing capabilities. Craft intricate rhythms and evolving patterns with per-step modulation, generative sequencers, and built-in effects for deep sound design.

Highlights
  • 20+ synthesis algorithms
  • 5 sampler algorithms
  • 8 drum channels with simultaneous sample/synth
  • 11 filter and 11 distortion modes
  • Per-step modulation and generative sequencers
  • Euclidean and permutation pattern engine
  • Global performance controls
  • Built-in Shatter Delay and Headspace Reverb
Currently charting
Read full description

"A deep world to get lost in - This delivers that in spades!" - Jamie Lidell, Hanging Out With Audiophiles Unfiltered Audio is back on iOS with its instant classic Battalion, perhaps the most advanced drum machine available on any platform. Battalion includes over 20 synthesis algorithms and 5 sampler algorithms, each built for advanced sound design via simple controls. All eight drum channels can use both samples and synthesis simultaneously. 11 filter modes and 11 distortion algorithms add further sculpting options to each voice. Additionally, all eight drum channels contain rich modulation available for every parameter, including two LFOs, two envelopes, and more. A global Performance page shows a simplified interface that allows you to manipulate every drum channel simultaneously. Want to hear your drum beat tuned down an octave with a single knob? Done. Need a global boost to distortion or a dramatic filter gesture? Easy. Each drum channel contains two sequencers. The first sequencer is a manual step sequencer with ratcheting, probability, velocity, pitch, micro-timing, and more... per-step! Each parameter lane can run at a different speed and length, making generative, evolving patterns a breeze. The second sequencer combines Euclidean patterns with an Unfiltered-designed permutation engine. Both sequencers run in parallel and receive further shaping via an array of Sequence Modifiers. Want one drum sequence to speed up while another slows down? The SHAPE parameter is here for you. Need that hi-hat to be a bit lazy? SHIFT will nudge it to rush or drag. And if you think drum machines have no soul, wait until you combine per-channel SWING with global HUMANIZE. All of this advanced sound design is glued together with a flexible mixer and Unfiltered Audio's evocative effects. Battalion contains two new Unfiltered Audio effects: Shatter Delay and Headspace Reverb. Shatter Delay combines granular stretching, dynamic ducking, sample crushing, and feedback spectrum sculpting into a melange of echo bliss. Dubby, dark, dotted echoes? Chaotic glitch storms? It's all here. Headspace Reverb evolves Silo's ten classic reverb algorithms with additional filtering options. You will always find the perfect reverb for your drum mix. Battalion includes over 150 presets to get you started. These cover a wide variety of genres and tempos, from glitch and IDM by esteemed sound designer DataBroth, to futuristic hip-hop from Willie Green (head of our favorite Backwoodz Studioz). From smoky and loose to shiny and mechanical, Battalion is ready to be your go-to solution for every rhythmic task.

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

Battalion4 screens
RackDocs4 screens

Verdict

The call

The clearest difference is price: RackDocs at Free against Battalion's $39.99. RackDocs also leads on update cadence (every 6 days vs every 5 months) and rating (5.0 vs 4.6). Battalion's advantage is in-app purchases (none vs 4) and chart position (#181 vs unranked). 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

CostPrice · In-app purchases · Ads · Monetization

RackDocs is free to download; Battalion costs $39.99 up front. RackDocs sells 4 in-app purchases, starting at $0.99 per month. Battalion asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RackDocs holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Battalion has 33 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 85% of Battalion's written reviews are positive against 100% of RackDocs's.

UpkeepUpdate frequency

Battalion ships an update every 5 months, RackDocs every 6 days. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

Scorecard9 real differences · 2 level
Battalion versus RackDocs: the parameters behind the verdict, then further details
ParameterBattalionRackDocs
Price$39.99Free — better
Rating4.6 (33 ratings)5.0 (4 ratings) — better
Positive reviews84.6% of reviews100.0% of reviews — better
Number of ratings33 — better4
Update frequencyEvery 5 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
Best chart rank#181 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size1.2 GB31 MB
Age rating4+4+
DeveloperUnfiltered AudioTheMM

Customer experience

Battalion

All ratings33 ratings
Positive93.9%
Neutral0.0%
Negative6.1%
Written reviews26 reviews
Positive84.6%
Neutral7.7%
Negative7.7%

RackDocs

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

In-app purchases

None

Battalion

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 Battalion free?
Battalion costs $39.99, with no in-app purchases.
Is RackDocs free?
RackDocs is free to download, with in-app purchases available.
Which has better reviews, Battalion or RackDocs?
RackDocs is rated higher. Battalion averages 4.6 out of 5 from 33 ratings, while RackDocs averages 5.0 from 4 ratings.
Do Battalion or RackDocs have ads?
Neither Battalion nor RackDocs shows ads.
Which is updated more often, Battalion or RackDocs?
Battalion ships an update every 5 months, and RackDocs every 6 days. Most recently, Battalion was updated on November 4, 2026 and RackDocs on November 5, 2026.

Other comparisons