Giveaway – Scaler Detector: Free Full Version | Chord Detector, Scale Detection and Music Theory Software – for Windows & Mac OS X
Find the key, scale and chords of any song in seconds. Get Scaler Detector today, play along in key, and build your own progressions before the current free offer ends on December 7, 2026!
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Scaler Detector is available for $9.00. But, you can now get a full version of Scaler Detector with a Lifeitme license for free through the Giveaway tab below. This offer is available for a limited time!

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Scaler Detector Giveaway
Available now: Free until December 07, 2026

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Scaler Detector Review at a Glance
You hear a sample loop, a favourite track, or an old guitar recording, and you want to know what is happening harmonically. Without years of ear training, guessing the key by hand is slow. Guessing the chords is slower. One wrong note can ruin a melody, a bassline, or a vocal topline. Many musicians lose creative momentum while searching for the right notes instead of making music.
Scaler Detector removes that obstacle. It is a standalone application and a VST3, AU and AAX plugin that detects the key, scale and chords of audio or MIDI the moment you play it in. You can analyse songs, identify harmonic content, find compatible chords, and build a stronger understanding of music theory as you work.
What Is Scaler Detector?
Scaler Detector is a key, scale and chord detection tool for macOS and Windows. It runs as a standalone program, like any other application on your computer. It also runs as an instrument, audio, or MIDI effect plugin inside a compatible DAW (digital audio workstation).
It tells you the musical key of whatever you feed it. That can be a whole song, an individual polyphonic audio track, or a raw stream of MIDI. It also works as a real-time monitor. The chord panel shows what you are playing, even when the detector is not actively recording.
Detection is only the first step. After the software identifies the key and scale, you can click any detected chord to hear it. You can drag chords from the interface into your DAW timeline. You can bind chords to your MIDI keyboard, and you can map the white keys of that keyboard to the notes of the selected scale. The result is a learning tool and a creative tool in one window.

Who Made It and Why It Works
Scaler Detector uses the same detection engine as Scaler 3, which the developer calls the world’s favourite music theory plugin. It packages that engine in a lightweight tool built for quick harmonic analysis, ear training, and building your own chord progressions. You can load it inside your DAW or run it by itself and focus purely on theory and composition.
The idea is simple and practical. You play or drag in any audio or MIDI file. The software shows the matching chords and the most likely scales, with mood descriptors such as serious, sad, or bright. Once a scale is detected, you can trigger its diatonic chords from your keyboard and form one-finger chord progressions in seconds.
Why Choose Scaler Detector
Many key-finding tools only return a note name. Scaler Detector returns chords, scales, mood descriptors, and playable results together. It is built on proven technology from Scaler 3. It runs on both major desktop platforms and supports several plugin formats.
It is also useful for analysing music you love. You can route audio from a streaming service or video platform into the software and see what is happening harmonically. That makes it a practical study aid as well as a production helper.
Key Benefits
The benefits below come from using the software in everyday production, practice, and study. Each one saves time or makes harmonic decisions easier.
- Instant answers: Detection happens in real time, so you do not wait for a long analysis.
- Fewer wrong notes: Knowing the exact key and scale lets you write melodies and basslines that fit.
- Faster sampling: You can identify the key of a sample pack loop and match it to your project right away.
- Recovered ideas: Old recordings, such as guitar progressions saved months ago, can be analysed to bring back what you originally played.
- Better learning: Seeing chords, notes and scales on an interactive keyboard teaches harmony as you play.
- Quick progressions: One-finger chords bound to your keyboard let you test ideas without drawing every chord.
- Smoother sound: Voice Grouping keeps chord voicings in a similar range, so progressions sound more musical.
- Flexible workflow: Use it inside your DAW or by itself, depending on the task.
Who Can Benefit
Different users get different value from the same set of tools. The people below are the ones most likely to use it daily.
- Music producers who need to match loops, samples and stems to a project key.
- Beat makers and electronic artists who want fast chord ideas without drawing every note.
- Songwriters and composers who want to understand the harmony behind their drafts.
- Guitarists and keyboardists who record ideas and want to know the chords afterward.
- Students and teachers who want a visual way to study scales, chords and ear training.
- DJs and remixers who need the key of a track for harmonic mixing.
- Mix and mastering engineers who need to check the key of individual instrument tracks.
Key Features
Below is a complete breakdown of the main tools inside Scaler Detector, grouped by the job each one does:
- Key, Scale and Chord Detection: Identifies the harmonic content of audio or MIDI in real time.
- Real-Time Key Detection: Shows the key of the music as you play it in.
- Scale Identification: Lists the most likely scales, with mood descriptors such as serious, sad, or bright.
- Chord Recognition: Names the chords found in a track, loop, or live performance.
- Compatible Scale Suggestions: Offers related scales and harmonic possibilities for your music.
- Drag and Drop Analysis: Gives instant harmonic results from files you drop into the app.
- Audio File Support: Analyses songs, loops and single instrument tracks.
- MIDI File Support: Reads MIDI files to reveal their chords, scales and key.
- Fast Results: Returns the harmonic breakdown without manual setup.
- Interactive Keyboard Display: Shows detected harmony visually.
- Chord View: Shows the notes of each detected chord on the keyboard.
- Scale View: Shows the notes of the selected scale so you can see the pattern.
- Audition by Click: Plays any detected chord when you click it.
- Bind to Keyboard: Lets you play detected chords from your MIDI keyboard.
- One-Finger Chords: Triggers full chords with a single key press.
- Diatonic Chord Mapping: Assigns the chords of the detected scale to your keys.
- Live Progression Testing: Lets you try progressions in real time without drawing notes.
- Scale White Keys: Keeps your playing inside the selected scale.
- White Key Mapping: Maps the white keys of your MIDI keyboard to the scale notes.
- Scale Search: Lets you search for a scale and apply it directly.
- Play-Along Mode: Lets you play melodies and harmonies in key without hitting wrong notes.
- Voice Grouping: Reworks chord voicings for a smoother sound.
- Automatic Voice Leading: Keeps chord voicings within a similar range.
- Alternative Voicings: Offers new colours and variations of detected chords.
- Richer Progressions: Makes chord changes sound more connected and musical.
- DAW Integration: Fits into the production environment you already use.
- Drag Chords to Timeline: Moves detected chords from the interface into your DAW.
- Instrument, Audio and MIDI Effect Modes: Loads on the track type that suits your workflow.
- Plugin Format Support: Runs as VST, VST3, AU (macOS only) and AAX.
- Standalone Operation: Works without a DAW.
- Independent Launch: Runs like any other program on your computer.
- Audio and MIDI Settings: Lets you set input and output routing inside the app.
- Streaming Analysis: Accepts audio routed from other applications for harmonic study.
- Platform Compatibility: Runs on current desktop systems.
- Apple Silicon Support: Runs natively on Apple Silicon Macs.
- Windows Support: Works on Windows 8 or higher in 64-bit mode.
- Broad DAW Support: Works with Ableton Live, Pro Tools, FL Studio, Cubase, Studio One, Bitwig, Reaper, Reason and more.
Requirements List
Check the specifications below before installing. Both platforms need a 64-bit system.
macOS
- macOS 10.14 or higher
- Native compatibility with Apple Silicon
- Standalone and plugin formats: VST, VST3, AU, AAX
- Supported DAWs: Ableton Live, Pro Tools, Logic Pro, FL Studio, Cubase, Studio One, Bitwig, Reaper, Reason and more
- 64-bit compatible only
Windows
- Windows 8 or higher
- Standalone and plugin formats: VST, VST3, AAX
- Supported DAWs: Ableton Live, Pro Tools, FL Studio, Cubase, Studio One, Bitwig, Reaper, Reason and more
- 64-bit compatible only
Free to Try
See how Scaler Detector fits your music before you commit. A free trial is available through the developer, and you need a Scaler Music account to access it. Click the button below to start testing the software on your own tracks, loops and MIDI files
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