Comparison

Ferromagnetic vs Light DJ

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

Head to head
About

Ferromagnetic

Transform music into real-time visual art with dynamic audio-reactive effects. Enhance personal listening, create ambiance for gatherings, or perform live with captivating visuals that sync to every beat. Offers thousands of unique visual combinations for a fresh experience with every song.

Highlights
  • Real-time audio-reactive visuals
  • Multi-band frequency analysis
  • Automatic beat detection
  • Metal-powered rendering engine
  • Multi-layer compositing system
  • Customizable visual parameters
  • Thousands of unique visual combinations
Features
Read full description

Ferromagnetic: Music Visualizer & VJ App for iPhone, iPad, and Mac Ferromagnetic turns Spotify, SoundCloud, YouTube, and any other sound into stunning real-time visuals. It's a professional audio visualizer for everyone, from home listening and house parties to DJ sets, live shows, and VJ performances. FM Visualizer: Effortless Background Visuals Start a System Broadcast and Ferromagnetic follows the audio of Spotify, SoundCloud, YouTube, and most other apps on your device. Or use the microphone to visualize anything around you, from a DJ set to a live band. The 12-band frequency analysis and tunable beat detection catch every beat and note, and a GPU-accelerated Metal engine renders it all in multiple layers. Pick a Vibe like Calm, Energetic, Trippy, or Retro to set the mood in one tap. Or let Ferromagnetic take the wheel and build new scenes on its own from over 1,000 combinations. Set how fast the scenes change and choose from ten transition styles, including Morph, Zoom, and Color Distance. Choose from over 20 audio-reactive effects: the signature Ferrofluid and Electromagnetic fields, plus Starfield, Petals, Laser, Glitter, Cloud, Refractions, and more. Build your own scene from three effect layers and particles, each with its own blend mode, and tune every layer to the bass or the highs. Particles burst and flow with the sound, and glitch and shake hit harder as the volume rises. Transform the image with Kaleidoscope, Droste Spiral, Voronoi Mirror, or Tunnel, then shape the look with pixelation, dithering, blur, and color palettes like Vivid, Warm, or Triadic. Show your own logo text on screen, perfect for cafes, bars, and venues. Mirror the visuals to a TV or projector with AirPlay or a cable, and the screen stays awake for as long as the music plays. Visuals render at up to 60 fps. FM Producer: Live Visual Performance On iPad, FM Producer turns Ferromagnetic into a VJ app for live shows. The dual-deck interface works like a DJ controller: prepare the next scene on one deck, then crossfade it in. Add the iPad camera or NDI® sources as live layers, and send your visuals to OBS, Resolume, and other apps with NDI output. Connect a MIDI controller or keyboard, map any control with MIDI Learn, and trigger effects and scenes without touching the screen. FM Producer also unlocks the complete Mac app, with video, image, and 3D model layers, presets, and video recording. Try It Free Download Ferromagnetic for free, then unlock only what you need with an affordable subscription or a one-time purchase. One purchase works on iPhone, iPad, and Mac. Already on FM Visualizer? Your purchase counts toward FM Producer. NDI® is a registered trademark of Vizrt NDI AB. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

About

Light DJ

Synchronize your smart lights with music to create dynamic visual experiences. Choose from various effects and color palettes that react to audio input, enhancing parties or everyday listening.

Highlights
  • Sound-reactive visual effects
  • Customizable color palettes
  • Automatic color selection based on music
  • Mellow and active effect modes
  • Nanoleaf-specific effects
  • Hue Entertainment area support
  • Multi-bridge support
Features
Read full description

Your Philips Hue, LIFX, and Nanoleaf Light Panels will shine with the Light DJ Visualizer, our powerful and easy-to-use app that allows you to create stunning visual effects and light shows that are synchronized to your music or any audio input. Whether you're hosting a party or just want to elevate your music listening experience, this app offers a wide range of customizable options to help you create mesmerizing visuals that will enhance your lighting system. *** THIS IS THE STANDALONE VISUALIZER VERSION. To try it first, or the full Light DJ experience, search for LIGHT DJ ENTERTAINMENT EFFECTS in the App Store! *** With the Visualizer you can create the ultimate music listening experience with just a few taps. The app listens to your music and changes the effects based on the mood of the song, making your lights more active during intense parts of a song and flowy with softer melodies. The lights magically change colors at just the right moment, adding a new level of ambiance to your music. COLORS PALETTES: Create palettes of up to 8 colors and store them in the app. The Visualizer will pick colors from your selected palette at random to display on your bulbs and panels. QUICK-COLOR CHANGES: Tap the shuffle button to quickly select a new palette at random or use the drag feature to apply standard colors. You can also double-tap on a color to apply it everywhere immediately. AUTO-COLOR SELECTION: When this option is enabled the Visualizer will analyze to your music and change the color palette when it detects a significant change in your music automatically. You'll be blown away each time the chorus hits or the DJ drops the beat. MELLOW EFFECTS: Choose from one of 4 mellow effect modes that activate during softer music (Swirl, Wave, Solid, None) ACTIVE EFFECTS: Choose from one of 5 active effects that activate during louder music (Fireworks, Splotches, Pulses, Flashes, Special Mix) NANOLEAF EFFECTS: Additional fill modes are included for Nanoleaf panels (Linear, Centroid, Bisect, Solid, Match Bulbs). Smoothness and angle can also be adjusted. HUE ENTERTAINMENT: Using a Hue Entertainment area you'll enjoy higher quality effects; the Visualizer will respond faster and with better sync. MULTI-BRIDGE SUPPORT: Combine lights from two or more bridges using the legacy effects or control multiple simultaneous entertainment areas. Visit lightdjapp.com for support or check out video previews at instagram.com/LightDJ This app requires hardware from one of these vendors: - Philips Hue: meethue.com - All Lights Supported - LIFX: lifx.com - All Lights Supported - Nanoleaf Lights: nanoleaf.me - All WiFi-based lights and panels supported including Shapes, Canvas, Lines, Elements, Blocks, Skylight, EXPO Cases, Aurora, A19 WiFi Bulbs, HD LED Strip, Outdoor String Lights and Permanent Lights, Holiday String Lights, and Multicolor Floor Lamp --------------------- Hi, I'm Kevin, the creator of the Light DJ Visualizer. I want to make sure that everyone gets a great light show, so if you're having issues getting the app to connect send me an email at kevin@nrthrnlights.com. I'm dedicated to making a quality app to show off your new lights!

Screenshots

Ferromagnetic4 screens
Light DJ4 screens

Verdict

The call

The clearest difference is price: Ferromagnetic at Free against Light DJ's $2.99. Ferromagnetic also leads on update cadence (weekly vs every 5 weeks) and ratings volume (26 vs 1). Light DJ's advantage is rating (5.0 vs 4.1) and in-app purchases (none vs 6). On ads, device support and iOS requirement 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

Ferromagnetic is free to download; Light DJ costs $2.99 up front. Ferromagnetic sells 6 in-app purchases, starting at $2.49 per month. Light DJ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Light DJ holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Ferromagnetic has 26 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Ferromagnetic ships an update weekly, Light DJ every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard6 real differences · 4 level
Ferromagnetic versus Light DJ: the parameters behind the verdict, then further details
ParameterFerromagneticLight DJ
PriceFree — better$2.99
Rating4.1 (26 ratings)5.0 (1 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings26 — better1
Update frequencyWeekly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS16.015.0 — better
Further details — not scored
Size23 MB59 MB
Age rating4+4+
DeveloperDaniel EkeNRTHRNLIGHTS, LLC

Customer experience

Ferromagnetic

All ratings26 ratings
Positive76.9%
Neutral3.8%
Negative19.2%
Written reviews70 reviews
Positive80.0%
Neutral7.1%
Negative12.9%

Light DJ

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Ferromagnetic

Reported bugs

14 issues
  • Song titles don’t update
  • Custom image wasn’t saving in presets (reported fixed)
  • Logo makes imported images blurry
  • App crashes on launch
  • Poorly implemented controls (MacOS)
Show 9 more
  • Does not work with Apple Music for some users
  • Does not sync with music for some users
  • Repeating visualizer scenes
  • Shoddy integration with Streamlabs
  • Does not work with microphone for some users
  • Visuals are seemingly random and endless
  • App asks to update when there's no update
  • Crashes every time audio input is changed after update
  • Recurring shapes pop up every few seconds

Requested features

20 requests
  • Add a 'go back' button for controls
  • Add Airplay mirroring or tvOS app
  • More options in visualizer types
  • Configurable presets for cycling settings
  • Ability to stream to TV without a cable
Show 15 more
  • Apple TV app development
  • More shaders and 4k-8k resolution options
  • More options to customize and create own shaders
  • More style options (e.g., retro equalizer, symmetric bars)
  • Ability to navigate a catalog or favorite visuals
  • Rotation feature for effects
  • Output to a file without screen capture
  • Choose output frame rate and size
  • Get rid of or manipulate recurring shapes
  • Remove Source/editor column from viewer window
  • Option to load songs directly from user's library
  • Transparency option for windows
  • More customization options
  • Effects inspired by Apple's classic visualizer
  • Bug fix for audio input crashes

Light DJ

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Ferromagnetic

Subscriptions2
  • FM Visualizer7 Days trial$2.491 Month
  • FM Producer7 Days trial$3.991 Month
One-time4
  • A generous tip$0.99
  • FM Visualizer One-TIme$17.99
  • FM Producer Upgrade$39.99
Show 1 more
  • FM Producer One-Time$59.99
None

Light DJ

No in-app purchases

Questions

Is Ferromagnetic free?
Ferromagnetic is free to download, with in-app purchases available.
Is Light DJ free?
Light DJ costs $2.99, with no in-app purchases.
Which has better reviews, Ferromagnetic or Light DJ?
Light DJ is rated higher. Ferromagnetic averages 4.1 out of 5 from 26 ratings, while Light DJ averages 5.0 from 1 ratings.
Do Ferromagnetic or Light DJ have ads?
Neither Ferromagnetic nor Light DJ shows ads.
Which is updated more often, Ferromagnetic or Light DJ?
Ferromagnetic ships an update weekly, and Light DJ every 5 weeks. Most recently, Ferromagnetic was updated on October 24, 2026 and Light DJ on October 25, 2026.

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