Is there an app that will mix songs for you?

Song mixing is the process of taking multiple recorded tracks (vocals, instruments, etc.) and adjusting their levels, EQ, effects, and more to blend them together into a cohesive song. It takes a skilled engineer to properly balance and process all the elements in a mix. Mixing can be very time consuming, especially for complex songs with lots of tracks. An automatic mixing app aims to take over most of this process using algorithms and artificial intelligence. With an auto-mixing app, musicians and home recordists can get their songs mixed quickly without needing to learn advanced mixing skills or hire an expensive professional mixer. The app analyzes the tracks and makes processing decisions to balance and polish the song. This allows for fast, low-cost mixing so musicians can complete their songs more efficiently.

Existing Apps

There are several existing apps for automatically mixing songs:

DJay – Originally released in 2007, Djay is one of the pioneering automatic DJ apps for iOS and macOS. It can detect song BPM and harmonic mixing for smooth transitions between tracks. Djay analyzes your music library and can suggest song combinations and create mixes for you. It has a matching algorithm and real-time sync so mixes sound fluid. Djay has integration with Spotify, SoundCloud, and more. [1]

edjay – Available for iOS and Android, edjay was released in 2011 and marketed as an easy way for anyone to DJ. It has an automix feature that blends songs together by tempo and harmonic key. The app can access your music library or streaming platforms and has visual beat syncing. Effects, loops, and cue points can be added to customize mixes. [2]

Cross DJ – First launched in 2014, Cross DJ is a free app for iOS, Android, Windows and Mac. It has automatic beatmatching and mixing capabilities along with advanced DJ features like sampling, effects and loops. Cross DJ can access local files or connect to streaming services. The UI is intuitive for beginners.[3]

Other apps like Virtual DJ, Serato DJ Intro, Zulu DJ, and Mixxx also have auto-mixing features and algorithms to transition smoothly between songs with matching BPMs and keys.[1]

How Automatic Mixing Works

Automatic mixing software analyzes the musical attributes of songs in order to smoothly transition between tracks. The main technologies used are beatmatching, key detection, and BPM sync.

Beatmatching lines up the beats of two songs so they are in sync. This allows for a seamless crossfade between tracks without tempo changes or clashing rhythms. The software detects and matches the tempo of songs measured in beats per minute (BPM). It uses algorithms to speed up or slow down tracks and get them in perfect sync.

Key detection analyzes the melody and musical key of each track. Songs in the same key are more harmonically compatible for mixing. The software detects the key and organizes tracks by harmonic compatibility. This prevents dissonant key clashes when transitioning between songs.

BPM sync makes sure the BPM of the incoming track matches the currently playing song. The software locks the speeds together so the beats remain aligned through the mix. Some programs allow manual adjustment of BPM sync for greater control.

By harnessing beatmatching, key detection, and BPM sync, automatic mixing tools can fluidly transition from one song to another. This creates professional mixes that sound pleasing and beat-consistent.


Automatic mixing apps provide several key benefits for both amateur and professional DJs:

Seamless transitions between songs is a major advantage. The apps analyze the BPM, key, and other attributes of the songs to line up perfect mixes The Best DJ Automix Software – Why It’s DJ.Studio. This results in smooth transitions that are indistinguishable from a human DJ mix.

It saves a huge amount of time compared to manually beatmatching and cueing up tracks. DJs can spend more time on other creative aspects like song selection, effects, and interacting with the crowd rather than technical mixing The Emergence of Automatic Mixing and Mastering.

The apps require no traditional DJ skills to use. Anyone can get professional quality mixes without needing to learn beatmatching or mixing techniques. This opens up DJing to a wider audience beyond experienced DJs What Is Auto Mixing for DJs? Automix DJ Software!.

Access to a vastly bigger music library since you don’t need to manually prep tracks. DJs can experiment with more genres, tempos, keys etc. Automatic mixing expands creative possibilities.


While automatic mixing apps provide convenience, they have some drawbacks compared to human DJs. According to discussions on Reddit (, one major downside is that automatic mixing lacks human creativity and nuance. Unlike human DJs who intuitively blend tracks and adapt to the vibe of the crowd, apps mix songs together in a robotic, formulaic way. This can make a DJ set seem dull or disjointed at times.

Another common critique is that automatic mixing apps sometimes make errors blending songs together. Without a trained ear guiding the transitions, you may get jarring clashes in key or awkward phase mismatches. Apps can’t necessarily detect if songs “go well together” from a creative standpoint either. So you end up with genre clashes or mixing of tracks with radically different energies.

There’s also limited control compared to manual mixing with turntables or a controller. While apps provide some customization settings, you can’t intricately adjust EQs or manipulate tracks on the fly like a real DJ. So the mixing lacks a true performative, improvisational element.

In summary, the downsides of automatic DJ apps include: lacks human creativity in blending tracks, prone to errors in mixing, limited control over transitions and mixing, and an overall robotic sound. For professional DJs or audiophiles, these limitations make automatic mixing a poor substitute for real-time human curation and mixing.

Best Practices

There are several tips to get the most out of auto-mixing apps:

Prepare your playlists carefully. Make sure the songs are similar in terms of BPM, key, and genre so they transition smoothly. Curate your playlists by energy level and mood as well.

Use high quality audio files for best sound quality. The apps will have an easier time beatmatching and crossfading with lossless or high bitrate files.

Take advantage of the DJ effects and filters built into the apps. Using these can help smooth transitions and give more polished mixes.

Adjust the transition time and crossfade settings. Experiment to find the right timing for each transition.

Create cue points on your tracks for the apps to use.

Check the song analysis and beatgridding in the software to make sure they are correct.

Practice using the apps to learn their features and create custom automixes.

Save your best automixes to listen back and improve your playlists and mixing.


The use of AI for automatic mixing and mastering has been increasing in popularity in recent years. Music streaming services like Spotify have begun experimenting with AI tools that can automatically master tracks to a uniform loudness and quality. According to an article on a16z, Spotify acquired two AI-powered mastering startups in 2021 as part of this effort (The Future of Music: How Generative AI Is Transforming the Music Industry).

AI technologies for audio processing are also rapidly improving. Machine learning models are being trained on wider datasets and larger neural networks, allowing auto-mixing tools to better emulate the skills of human mixing engineers. Startups like Unchained and services like RoEx Audio are leveraging these AI advancements to provide automated mixing and mastering for independent musicians.

As the underlying AI continues to progress, automatic mixing is likely to become an increasingly mainstream part of music production workflows. Musicians may soon be able to instantly mix a song to commercial quality standards entirely automatically.

Use Cases

Automatic mixing apps can be incredibly useful in a variety of scenarios. Here are some of the most common use cases:


When DJing a party, automatic mixing allows you to queue up a long playlist and let the app handle seamlessly transitioning between songs ( This frees you up to focus on engaging with guests, taking requests, and monitoring the mood rather than worrying about manual beatmatching. The automated crossfading creates a continuous musical experience.

Background Music

Auto-mixing apps are great for extended background listening when you don’t want to be actively queueing up music. You can let the app run for hours, adapting the music selection to the energy in the room ( The algorithms detect compatible songs and smoothly transition between them.

Long Playlists

If you have a playlist with hundreds of songs, auto-mixing can help avoid clashing keys and tempos as it progresses through the list. Rather than abrupt transitions between mismatched songs, it will intently blend everything together ( This results in a pleasant listening experience.

Seamless Listening

In general, automatic mixing aims to create seamless transitions between songs. Algorithms analyze the songs’ keys, BPM, structure, and energy levels to find optimal points to mix in the next track. This seamless flow enhances the listening experience.


To conclude, apps like Neural mixing and Intelligent Mix can provide automated DJ mixing and crossfading between songs. The algorithms analyze the songs’ BPM, key, loudness, and more to create smooth transitions. The main benefits are saving time, enhancing workflow, and enabling novices to get professional results. However, there are downsides – the mixing may lack a human DJ’s artistry, nuance, and ability to react in real-time. Overall, these AI DJ apps are impressive technological achievements with practical uses, but unlikely to fully replace the creative role of a human DJ anytime soon.


Here are some suggestions for the best automatic mixing apps based on different needs:


For DJs, Algoriddim’s Djay is a top choice. It offers advanced auto-mixing capabilities like harmonic mixing, beatmatching, and crossfading between songs. Djay analyzes your music library and makes intelligent suggestions on which songs blend well together. The app also has visual waveforms and tempo syncing for precision mixing.

Casual Listeners

For casual listening, check out Spotify’s automated playlists. Just pick a playlist genre like Discover Weekly or Release Radar and Spotify will automatically mix songs and artists you like into a seamless flow. The algorithms get smarter the more you listen. Spotify playlists are perfect for background music.

Music Producers

For music producers, Mixed in Key is an excellent mixing app. It detects the key and tempo of your songs to help you harmonically mix music. The app creates cue points, offers editing tools, and provides advanced options for smooth transitions. Ideal for remixing tracks.

So in summary, while there are many great auto-mixing apps available today, focus on your specific needs to find the best solution. DJs need advanced mixing capabilities while casual listeners want an easy background listening experience.

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