Surface Builder vs TD3 Studio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Surface Builder
Create custom MIDI control surfaces for audio applications. Design interfaces with buttons, knobs, and faders to send and receive MIDI data, control audio clips, and customize appearance. Supports AUv3 plugins and standalone use.
- Customizable MIDI control surfaces
- AUv3 plugin and standalone modes
- Send/receive MIDI data (notes, controllers, pitch bend)
- Audio clip playback control
- Multi-scene interface design
- Drag and drop interface customization
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Surface Builder is a tool for creating control surfaces that send MIDI data to one or more audio components in order to simplify remote control tasks. You start by creating a surface of a given size, adding buttons, knobs, faders, etc. to the surface and configuring them to generate the required MIDI output. Surface Builder allows you to send note on/off, controller change and program change values as well as being able to emulate modulation wheel and pitch bend data. Buttons can also be configured to send bulk MIDI data using a single key press. You can build surfaces that span multiple scenes and link between them for large complex interfaces. Incoming MIDI data can also be used to control or trigger elements of the interface, giving a bi-directional stream of MIDI data. Surface Builder can be added as a pure MIDI plugin which allows processing of MIDI only, or as an instrument plugin, allowing you to process audio passing through it. You can even load it as an intrument and configure a surface to start and stop audio clips either manually or remotely. Surface Builder was designed to be used as an AUv3 plugin within your favourite DAW, but it can also be used in standalone to send MIDI directly to MIDI hardware using direct access to their MIDI ports. Many different object types are supported including buttons, switches, lights, rotary knobs, faders, sliders, XY-Pad, keyboards, as well as text, image and box objects. Each object has many different styles and colours, so no two surfaces look the same. Drag and drop an audio file onto a button and that button becomes a clip player. Attach rotary knobs to control the clips volume and pan. Throw on top of that a LP/HP filter knob and you are cooking on gas. Drop PNG transparent image icons on buttons to customise the look and feel. A button can record and playback bulk MIDI commands, on both button press and release. So pressing a button could send the notes of a chord when pressed, and appropriate note offs on release. A surface can consist of up to 6 scenes for really complex designs. Buttons and switches can be used to switch scenes and also to show and hide other objects to make better use of screen space. Once your surface is complete switch to presentation mode to hide all the toolbars. Each surface can be saved with compressed audio and images all in a single surface file. Features ○ AUv3 and standalone modes. ○ Bluetooth MIDI support. ○ Drag and Drop interface. ○ Send and Receive Note On/Off. ○ Supports all Control Change parameters. ○ Supports Program Change commands with bank support. ○ Multiple Audio Clip playback. ○ Record and playback bulk midi data. ○ Multi-Scene. ○ Multi-level undo/redo. ○ MIDI Monitor ○ Presentation Mode. ○ iPhone and iPad compatible.
TD3 Studio
This application converts MIDI files into patterns for the Behringer TD-3 or TD-3-MO synthesizer. It allows users to build and edit patterns step-by-step, with or without the physical hardware, using an on-screen keyboard and simulator.
- MIDI file to pattern conversion
- Step-by-step pattern building
- On-screen keyboard and MIDI input
- Built-in TD-3 simulator
- Accents, slides, ties, and rests editing
- Library management via Files app
- Cross-platform compatibility (iPhone, iPad, Mac)
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TD3 Studio turns a MIDI file into a pattern for the Behringer TD-3 or TD-3-MO: drop a file in and the sixteen steps are cut for you, ready to edit, play and send to the device. Build a pattern from nothing too, step by step, from the on-screen keys or a MIDI keyboard plugged into your iPad or iPhone, with accents, slides, ties and rests one touch away. No TD-3 within reach? The app plays through a built-in simulator on the device's own speakers, a 303 voice of its own, so every pattern can be built and heard before the hardware ever comes out. Patterns and edits sound the same either way. One purchase covers iPhone, iPad and Mac: buy TD3 Studio once and it is yours on all three. The library lives in the Files app, under "TD3 Studio": your own patterns, the 107 TB-303 patterns from the bundled Acid-Tabs collection, and search across free online MIDI archives, all from the one panel. Open a MIDI file from Files, and it goes straight through the converter, with a timeline for picking which sixteen steps become the pattern. On iPad the whole instrument is one landscape plate: the step grid, the tone knobs, the transport and the library side by side. Below the grid sits an on-screen keyboard of one to three octaves, with accent and slide toggles and Tie and Rest buttons. Play it to edit the selected step, or press Record for 303-style step entry, one key filling one step, straight into the sequencer. On iPhone the same tools are arranged across three screens: PATTERN for the step grid and keyboard, SOUND for the simulator's tone, and DEVICE for USB or Bluetooth output and the TD-3's read and write slots. A fixed header carries file and library access and the three tabs, and a fixed transport strip below carries start, stop, tempo and the step count, so both stay in view while the middle changes. A key, Tie or Rest enters the selected step and moves to the next one, so a full pattern is sixteen taps. TD3 Studio needs a TD-3 or TD-3-MO to write or hear patterns on real hardware. On a USB-C iPad or iPhone, use Apple's USB-C to USB Adapter with the TD-3's own USB cable, or a USB-C to USB-B data cable that follows the USB-C standard (a branded USB-C printer cable; cheap ones lack the resistor that makes the phone the host and then work on a PC but not on a phone). A Lightning iPad needs an MFi Lightning to USB-B MIDI cable or Apple's Lightning to USB Camera Adapter. A Bluetooth MIDI adapter on the TD-3's MIDI IN works too. The TD-3 runs on its own power. Without the hardware, the simulator carries the whole app. TD-3 and TD-3-MO are trademarks of Music Tribe. TD3 Studio is an independent app, not affiliated with or endorsed by Music Tribe or Behringer.
Screenshots
Verdict
The clearest difference is price: Surface Builder at $14.99 against TD3 Studio's $22.99. Surface Builder also leads on iOS requirement (13 vs 17.0). TD3 Studio's advantage is update cadence (every 3 days vs every 3 weeks) and review sentiment (100% vs 80%). On ads, in-app purchases, monetization model 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
Surface Builder costs $14.99 and TD3 Studio $22.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Surface Builder ships an update every 3 weeks, TD3 Studio every 3 days. The most recent releases landed on October 20, 2026 and October 11, 2026 respectively.
| Parameter | Surface Builder | TD3 Studio |
|---|---|---|
| Price | $14.99 — better | $22.99 |
| Rating | 4.7 (15 ratings) — better | — |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | — |
| Update frequency | Every 3 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 13 — better | 17.0 |
| Further details — not scored | ||
| Size | 32 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | 4Pockets.com | Johan Nieuwhoff |
Customer experience
Surface Builder
TD3 Studio
In-app purchases
Surface Builder
No in-app purchases
TD3 Studio
No in-app purchases
Questions
Is Surface Builder free?
Is TD3 Studio free?
Do Surface Builder or TD3 Studio have ads?
Which is updated more often, Surface Builder or TD3 Studio?
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