Comparison

NullPerator vs Sound With Bones

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

Head to head
About

NullPerator

Features
Read full description

NullPerator brings the focused tracker workflow to iPhone and iPad. Compose patterns, arrange songs, record samples, and play them back through a compact interface designed around the NullPerator hardware. Use the on-screen controls or connect a compatible game controller. Route MIDI, keep projects in the Files app, and continue working without an account. Features: • Tracker composition and playback • Touch controls optimized for portrait and landscape layouts • Compatible game controller input • MIDI routing, including supported Bluetooth MIDI devices • Sample recording through the current iOS audio input • Local project and sample storage through the Files app • iPhone and iPad support Your projects and settings stay on your device. NullPerator does not include advertising, analytics, or account tracking.

About

Sound With Bones

Create unique musical instruments by drawing physical structures. Hear your creations sing, then manipulate their mass and stiffness to shape the sound. Record and edit performances, or export your creations as audio files.

Highlights
  • Draw physical instruments
  • Shape sound by adjusting mass and stiffness
  • Record and edit performances
  • Export audio and editable workshops
  • Two-handed play with damping and pinning
  • Learn physics through sound experiments
  • AUv3 instrument for music apps
Features
Read full description

Draw a structure you can play. Hear it sing, then record how you change it while it rings. Sound With Bones is a physical modeling instrument built from your drawings. A sketch becomes connected joints whose mass and stiffness shape the sound. Pluck a joint, cut a ringing connection, then repair it and hear the structure change. HEAR YOUR DRAWING SING Tap Listen and your drawing plays a whole song, tuned from its own resonances. Change the shape and the same song sounds new. Soft Geometry, an original, and Twinkle, Twinkle are free. SHAPE SOUND BY LISTENING Choose a brighter or less bright sound. The Workshop proposes small changes to a joint's mass or a connection's stiffness. Compare each edit with the same strike, reference pitch, duration and listening level. Keep a version or return to your original. CHANGE THE INSTRUMENT AS IT PLAYS In Workshop > Perform, record the strikes, cuts and repairs you play. Keep the take as editable actions on a beat timeline. Move an action, adjust the tempo and replay it from the drawing captured at the start. A cut changes the sound already ringing. You can also arrange actions by hand. With Plus, export the performance as WAV with its editable workshop. MAKE A FAMILY OF RELATED SOUNDS Create soft, firm, edge and broken variations from one drawing. Edit the strike location, force, softness and connection cut, and hear each one. With Plus, export named 24-bit stereo WAV files at 48 kHz together with the workshop, drawing and recipes. PLAY WITH TWO HANDS Hold one joint while another finger plucks the shape. Damp removes energy where that joint moves. Pin constrains the held joint and changes its resonances. Release it to hear the original structure again. LEARN BY LISTENING Predict what lighter joints will do, hear the natural resonance change, then try an unfamiliar drawing. Isolate one vibration mode or listen to local damping. Save your prediction, measured result and both sounds. Reopen the exact comparison even after changing your current drawing. These experiments use the same physical model as your instrument. BRING YOUR DRAWINGS INTO A MUSIC APP The included AUv3 instrument responds to MIDI notes, velocity and sustain in compatible hosts. Open an exported drawing or workshop in the plug-in. Its drawing is saved with the host project. KEEP YOUR WORK Save instruments, recordings and workshop versions locally. Share editable drawings and workshops through Files. Export recordings as M4A, or import supported audio into your library. Imported recordings remain audio clips; they do not become physical instruments. SOUND WITH BONES PLUS Drawing, playing, cutting, recording, saving, sharing, Workshop comparisons, performances, learning and the AUv3 instrument are free. Plus adds: • 8 more songs, including Für Elise, Canon in D, Bach's Prelude in C and Gymnopédie No. 1 • 8 sculpted shapes: Ribcage, Wishbone, Shell, Bell, Harp, Kalimba, Star and Web • Recordings up to 10 minutes (free recordings stop at 1 minute) • 24-bit WAV export of sound families and Workshop performances • New songs and shapes as they are added Plus is available as a yearly subscription with a 7-day free trial, a monthly subscription, or a one-time lifetime purchase. Payment is charged to your Apple Account when you confirm, or when the free trial ends. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. No account or microphone access is required. Synthesis and recording run on your device. Synthesized sounds come from the drawing's physical model. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sound-with-bones.netlify.app/privacy

Screenshots

NullPerator1 screens
Sound With Bones4 screens

Verdict

The call

The clearest difference is update cadence: NullPerator at daily against Sound With Bones's every 3 days. On price, ads, in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

NullPerator ships an update daily, Sound With Bones every 3 days. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

Scorecard1 real difference · 9 level
NullPerator versus Sound With Bones: the parameters behind the verdict, then further details
ParameterNullPeratorSound With Bones
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyDaily — betterEvery 3 days
AdsNoNo
In-app purchasesNoNo
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size3 MB5 MB
Age rating4+4+
Developer203 SystemsNo Worries! Lifestyle, LLC

In-app purchases

None

NullPerator

No in-app purchases

None

Sound With Bones

No in-app purchases

Questions

Is NullPerator free?
NullPerator is free to download, with no in-app purchases.
Is Sound With Bones free?
Sound With Bones is free to download, with no in-app purchases.
Do NullPerator or Sound With Bones have ads?
Neither NullPerator nor Sound With Bones shows ads.
Which is updated more often, NullPerator or Sound With Bones?
NullPerator ships an update daily, and Sound With Bones every 3 days. Most recently, NullPerator was updated on October 6, 2026 and Sound With Bones on October 3, 2026.

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