Comparison

sir Sampleton vs Audulus 4

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

Head to head
About

sir Sampleton

Record and play back sounds on dual keyboards with a built-in rhythm machine. Inspired by 80s samplers, this app lets you create lush, complex musical textures from your voice, instruments, or other noises. Samples can be looped, customized, saved, and shared.

Highlights
  • Sample from microphone
  • Dual piano keyboards
  • Built-in rhythm machine
  • Save and email samples
  • Download free samples
  • Adjust tuning and effects
  • Sample from other apps via Audiobus
Features
Read full description

"surprisingly powerful" - Wall Street Journal used by DJ/producer Zedd! // supports Audiobus, MIDI, iOS13 Sir Sampleton is a sampling musical keyboard inspired by Casio and Yamaha samplers from the 80s. The app allows you to record sounds through the microphone and then play them on dual piano keyboards accompanied by a rhythm machine. You'll be surprised at the lush, complex musical sounds that can be created with samples of your voice, musical instruments, and other noises. Samples can be looped, customized, saved, and emailed, and we offer free samples for download on our website. Supports Audiobus, Inter-app Audio, CoreMIDI, MIDI Mobilizer 1 and 2. Works as a virtual instrument for apps like Cubasis, Beatmaker 2, and Genome sequencer. Capable of sampling other apps and effects through Audiobus. Sampleton applies a subtle stereo effects process to the audio giving it a fuller, warmer sound that you'd typically get from sampling a monaural microphone. If you like my apps please leave ratings or reviews! For support email sirsampleton@gmail.com FEATURES: • Sample from the microphone and immediately play your sounds on dual keyboards • Save and email sample packs to friends, or to yourself for backup/transfer • Download free samples from our website • Built-in beats and computer beat generator • Adjust tuning, release, vibrato, sample time, and much more • Record, add effects, and sample from other apps (requires Audiobus app) • Put a different sample on each keyboard in dual-sample mode • Multitouch with 18 voices for rich sound • Automatic smart microphone level adjustment • Supports all CoreMIDI devices, Line6 MIDI Mobilizer 1 and 2 • Virtual MIDI for compatibility with Cubasis, Beatmaker 2, and Genome • Multichannel MIDI mode places different samples on each MIDI channel, up to 24 samples • Supports iRig external audio input adapter and iRig microphone • Low latency • Coming soon: Audio copy/paste, additional sample banks, and more! INSTRUCTIONS: TO SAMPLE: press the red button and speak into the microphone. It will sample for about 3 seconds. TO PLAY A DRUM BEAT: press the drum icon button in the upper left to open the Rhythm Menu, and then select the beat you want to play. To change the tempo or beat volume, use the buttons on the right. Press the X to return to the keyboard. TO GENERATE A RANDOM BEAT: press the drum icon button to open the Rhythm Menu, and then press the RANDOM button. To generate a new random beat, press the button again. TO SAVE A SAMPLE: press the keyboard icon button in the upper left to open the Sounds Menu. Press SAVE and then choose one of the flashing numbered buttons. Your sample is then saved on that button. Press the X to return to the keyboard. TO LOAD A SAMPLE: press the keyboard icon button in the upper left to open the Sounds Menu. Press the numbered button where you saved the sample. Press the X to return to the keyboard. TO PREVIEW A SAVED SAMPLE: press and hold the numbered button in the Sounds Menu. TO SAVE CHANGES TO A SAMPLE'S SOUND SETTINGS: press and hold the 'save' button in the Sounds Menu.

About

Audulus 4

Create and shape sounds with a professional-grade modular synthesizer environment. Explore a vast library of modules for synthesis and sound design, with the option to expand your toolkit with premium instruments and effects. Available across Apple devices for seamless workflow.

Highlights
  • Modular synthesizer environment
  • Sound design tools
  • Real-time audio shaping
  • Extensive module library
  • Premium Pro Modules (in-app purchases)
  • Cross-device iCloud sync
  • AUv3 plugin support
Features
Read full description

Build synthesizers. Design sounds. Shape audio in real time. All with professional-grade, low-latency performance ready for live use — and it’s free. Audulus gives you a complete modular environment at no cost. Its clean, fluid interface stays out of the way so you can focus on what matters: exploring sound. A modular playground with room to grow — from first experiments to advanced designs. Looking for more? Discover the Pro Module series: premium instruments and effects that show what’s possible when world-class sound design meets true modular freedom. Each Pro Module is crafted specifically for Audulus, giving you new ways to expand your sonic toolkit. Available on iPhone, iPad, and Mac — your modular system travels with you. ▶ What People Are Saying: "gem for Apple platforms – gorgeous, fluid" — Peter Kirn, createdigitalmusic.com "stunning!" — Richard Devine, devinesound.net "Remarkable gesture control" — sequencer.de ▶ Join our forum and Discord community! ▶ What You Get: • Complete modular environment — free to download and explore • Pro Module series — premium modules available as in-app purchases • Available on iPhone, iPad, and Mac with iCloud sync • Standalone app or AUv3 plugin • Deep node library for building from scratch • Extensive module library for synthesis and sound design • Multi-channel signal flow for polyphony and complex routing • Next-gen multi-core audio processing • Smooth, high-performance graphics even with massive patches • MIDI I/O with MIDI learn • GLSL shader node for creating advanced visuals • Lua scripting for custom DSP and vector graphics Terms of Use: https://audulus.com/terms.html

Screenshots

sir Sampleton4 screens
Audulus 44 screens

Verdict

The call

The clearest difference is price: Audulus 4 at Free against sir Sampleton's $0.99. Audulus 4 also leads on rating (4.3 vs 3.3) and update cadence (monthly vs every 3 months). sir Sampleton's advantage is in-app purchases (none vs 27) and iOS requirement (10.0 vs 18.0). On review sentiment, ratings volume, 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

Audulus 4 is free to download; sir Sampleton costs $0.99 up front. Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. sir Sampleton asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Audulus 4 holds the better App Store score, 4.3 against 3.3. Both are backed by a comparable volume of ratings — 47 and 74 respectively. Written reviews point the same way: 66% of sir Sampleton's written reviews are positive against 69% of Audulus 4's.

UpkeepUpdate frequency

sir Sampleton ships an update every 3 months, Audulus 4 monthly. The most recent releases landed on September 28, 2026 and September 12, 2026 respectively.

Scorecard6 real differences · 4 level
sir Sampleton versus Audulus 4: the parameters behind the verdict, then further details
Parametersir SampletonAudulus 4
Price$0.99Free — better
Rating3.3 (47 ratings)4.3 (74 ratings) — better
Positive reviews66.3% of reviews69.2% of reviews — better
Number of ratings4774 — better
Update frequencyEvery 3 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better18.0
Further details — not scored
Size21 MB103 MB
Age rating4+4+
DeveloperPaul SlocumAudulus LLC

Customer experience

sir Sampleton

All ratings47 ratings
Positive46.8%
Neutral19.1%
Negative34.0%
Written reviews104 reviews
Positive66.3%
Neutral10.6%
Negative23.1%

Audulus 4

All ratings74 ratings
Positive82.4%
Neutral4.1%
Negative13.5%
Written reviews78 reviews
Positive69.2%
Neutral10.3%
Negative20.5%

User reviews

sir Sampleton

From 47 App Store ratings

What we love

  • 👍 Simple, intuitive, easy-to-use interface
  • 🎹 Great Casio SK-1 emulation and nostalgic appeal
  • 🎵 High-quality sound and audio fidelity
  • 🎧 MIDI and Audiobus support for integration
  • 🎨 Clean, minimalist design

Room to improve

  • 🐛 Screen orientation issues (stuck in portrait/vertical mode)
  • 🐛 Touch input misalignment and unresponsive controls
  • 🐛 Graphics scaling problems on newer devices
  • 📱 Incompatible with iOS 16 and later versions
  • 🐛 Distorted/crackling audio from microphone recording

Audulus 4

From 74 App Store ratings

What we love

  • ✨ Powerful modular environment
  • 💡 Deep DSP programming capabilities
  • 🎨 Intuitive and beautiful UI
  • 🚀 Seamless workflow across devices
  • 📚 Great for learning synthesis

Room to improve

  • 💸 Expensive in-app purchases/subscriptions
  • ⚠️ Steep learning curve for beginners
  • 📱 UI issues on mobile (scrolling, view obstruction)
  • 📉 High CPU usage
  • ❓ Lack of comprehensive documentation

Bugs and requests

sir Sampleton

Reported bugs

13 issues
  • Screen stuck in portrait mode, won't rotate to landscape
  • Touch input only registers on 1/4 of screen
  • Graphics and app engine mismatch causing display corruption
  • App incompatible with iOS 16, 16.2, 16.4.1, 17.5.1
  • Microphone recording produces unintelligible distorted crackling
Show 8 more
  • Audio outputs through earpiece speaker instead of main speaker
  • App crashes on startup
  • App freezes and locks up device
  • Keys play different notes than pressed
  • Some keys don't register input
  • Requires full device restart to fix screen orientation
  • MIDI interface not recognized
  • Volume too low or no volume after updates

Requested features

15 requests
  • Export samples as MP3/WAV files
  • Sequencer for arranging samples into songs
  • Reverse/reverse-loop functionality
  • Sustain button/function for live performance
  • Arpegiator feature
Show 10 more
  • Sample envelope presets
  • Ability to assign different samples per key
  • GarageBand compatibility
  • Audio copy/paste between apps
  • Sample gain adjustment
  • Pitch shift without changing playback rate
  • Record and layering features
  • Loop begin/end point selection
  • Effects (reverb, delay, etc.)
  • Sample naming and preset saving per sample

Audulus 4

Reported bugs

13 issues
  • iOS 18 compatibility issues (app not working)
  • Save presets but no 'Load' button
  • Undo command issues with DAWs
  • CMD+Z causing data loss
  • Opt+drag not duplicating modules
Show 8 more
  • Plugin window not resizable
  • Menu filtering not functioning properly on iPhone
  • Select and Import buttons not working
  • Blank screen on open
  • App freezes on iPad Pro
  • Black screen on launch after update
  • No modules appearing after iOS 18 update
  • Patches not appearing after iOS 18 update

Requested features

7 requests
  • Add 'Load' button for presets
  • Improve DAW integration (Undo, duplicate)
  • Resizable plugin window
  • More modules (FFT/IFFT, granular buffering)
  • Add CC in module
Show 2 more
  • Sync to host as AUv3
  • Make upgrade path clearer from Audulus 3

In-app purchases

None

sir Sampleton

No in-app purchases

27 purchases

Audulus 4

Subscriptions2
  • Audulus Pro (1 Month)7 Days trial$4.991 Month
  • Audulus Pro (1 Year)7 Days trial$29.991 Year
One-time25
  • 1-shot Sample$1.99
  • P-Train$2.99
  • CLK RS-1$3.99
Show 22 more
  • CG-1 Chord Generator$3.99
  • CLK Clock Generator$4.99
  • MetaEnvelope$4.99
  • Modal Percussion$4.99
  • CLK: TimeWarp$4.99
  • CPR-1$4.99
  • LMT-1$4.99
  • MS-FUNC$5.99
  • CLK SS-516$7.99
  • J-23 Reverb$7.99
  • J-23 Effects$7.99
  • CLK GS-1$7.99
  • Chaos LFO Bundle$7.99
  • ARP-1$7.99
  • CPR-3$7.99
  • SynD-K1$7.99
  • TRIKOR VCO$9.99
  • CLK Tools Bundle$9.99
  • Essential Synth Bundle$9.99
  • VCF Bundle 1$9.99
  • J-23 Space Console$14.99
  • Patch Editing$29.99

Questions

Is sir Sampleton free?
sir Sampleton costs $0.99, with no in-app purchases.
Is Audulus 4 free?
Audulus 4 is free to download, with in-app purchases available.
Which has better reviews, sir Sampleton or Audulus 4?
Audulus 4 is rated higher. sir Sampleton averages 3.3 out of 5 from 47 ratings, while Audulus 4 averages 4.3 from 74 ratings.
Do sir Sampleton or Audulus 4 have ads?
Neither sir Sampleton nor Audulus 4 shows ads.
Which is updated more often, sir Sampleton or Audulus 4?
sir Sampleton ships an update every 3 months, and Audulus 4 monthly. Most recently, sir Sampleton was updated on September 28, 2026 and Audulus 4 on September 12, 2026.

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