Free DJ tools: tempo first, then key.

How to use the DJ tools, and what to do with the number

1. Get the tempo. Open the BPM counter, tap Listen and hold the phone near the speaker, or pick the track's file. A number shows once four beats sit on one grid and locks after eight. Too loud, or no clean beat to hear? Tap tempo: tap on every kick, and eight taps give the average.
2. Check the octave. No counter can know whether you feel 87 or 174; both offer half and double. Take the one the genre runs at (the list below).
3. Set the pitch fader. The change in percent is (target ÷ current − 1) × 100. From 124 to 128 BPM is +3.2 %, inside a turntable's ±8 % and even a CDJ's narrowest range, ±6 %.
4. Time the effects. Both counters give delay, LFO and gate times for the tempo: at 124 BPM a quarter note is 484 ms and the dotted eighth, the classic echo, 363 ms.
5. Check the key. Look up both tracks' keys on the wheel further down: neighbours mix.

Genre tempos at a glance

The usual tempo of each genre; its page gives the range, plays a groove at it and lets you move it. Read the range, not the single number: house runs anywhere from 115 to 130.

• Deep house BPM122
• House BPM124
• Tech house BPM126
• Techno BPM130
• Trance BPM138
• Psytrance BPM145
• Hardstyle BPM150

Half and double time are one beat counted two ways. That is how a drum and bass set at 174 takes a hip-hop record at 87, and why dubstep at 140 feels like 70: the snare lands on the third beat, not on two and four.

Mixing in key: the Camelot wheel

Every key has a number from 1 to 12 and a letter: A for minor, B for major. That is the Camelot wheel, Mark Davis's system, the one Mixed In Key uses. Two tracks mix cleanly on the same code, one number up or down, or across to the other letter: 8A, A minor, and 8B, C major, share all seven notes. Two numbers up is the energy boost. Rekordbox can show the codes (it calls them alphanumeric); Traktor's Open Key is the same wheel turned, Camelot minus 7, so 8A is 1m and 8B is 1d.

The pitch fader moves the key too, unless key lock (master tempo) is on. About +5.9 % is a semitone (the twelfth root of 2 is 1.0595, so 5.95 %), seven steps round the wheel: 8A becomes 3A. A +3.2 % push lands between two keys, which is why a long blend can sound sour with key lock off.

What are DJ tools?

Three things go by the name. The software and gear a DJ plays with: decks, a mixer or a controller, and the program that analyses the music. DJ tool tracks: records made to be mixed rather than listened to, which is why albums called DJ Tools fill the streaming services. And small helpers like the ones above, each answering one question: what tempo, what key, what mixes.

A DJ tool track is built to be layered or used as a bridge: a beat-only version, a percussion loop, an acapella, an intro that is only kick, a snare roll that builds. Many are sold in one version per tempo (a snare roll at 120 and at 128 BPM), so they drop in without moving the pitch fader. Labels put DJ Tool, Beat Mix or No Kick nor Bass Mix in the title, and Beatport files them under a genre of their own, DJ Tools.

Hip-hop has its own kind: battle records full of breaks and scratch sounds, the most used being the "ahhh" and "fresh" at the end of the 1982 twelve-inch Change the Beat (Fab 5 Freddy).

DJ TechTools is something else again: a US shop, blog and forum that makes the Midi Fighter controllers and the Chroma Caps knobs and cables. Brumm has nothing to do with it.

Which DJ software is free? (as of October 2026)

Choose the software for the gear you will play on: it decides which controllers work and whether your music goes into the club on a USB stick. Most club booths have AlphaTheta (formerly Pioneer DJ) players, which read sticks prepared in Rekordbox.

Paid tiers as of 2026 (DJ.Studio's roundup, US prices): Rekordbox about $10 to $30 a month by plan; Serato DJ Pro $11.99 a month or $249 once; Traktor Pro 4 €149 once; VirtualDJ Pro $19 a month or $299 once (Pro Infinity); djay Pro $6.99 a month or $49.99 a year. Engine DJ and Mixxx cost nothing. From the makers' plans as summed up by Digital DJ Tips (2025) and DJ.Studio (2026); prices and tiers change. Streaming inside DJ apps depends on the service and the plan, and a dropped connection in the booth stops the track: for a gig, files you own are the safe bet.

Which DJ software is best for beginners?

For beginners, the software comes with the first controller: the Pioneer DJ DDJ-FLX4, the one most beginners start on (Digital DJ Tips, 2026), unlocks Rekordbox and Serato DJ Lite. With no controller: Mixxx, or VirtualDJ at home. On a phone or tablet: djay.

AI DJ tools and free online DJ mixers

AI DJ tools today mostly means three things inside that software: stem separation (pull the vocal or the drums out of a track live), automix, and next-track suggestions from your library. A free online DJ mixer in the browser, from two-deck toys to trainers such as Tribe DJ that copy a beginner controller (the DDJ-FLX4) on screen, is good for learning what an EQ or a crossfader does, not for a gig. This page has no mixer, only the numbers a mix needs.

What equipment do I need for a beginner DJ setup?

• A two-channel controller. It comes with its software (Rekordbox, Serato or Traktor, depending on the brand). Two decks are all a beginner uses.
• A laptop to run it, or a phone or tablet with a DJ app.
• Closed headphones, to hear the next track over the room.
• Two active speakers at home; a club has its own, plus a booth monitor.
• Music files you own, analysed in the software before you play.

What machines do DJs use, and what is the equipment called?

Most DJs play music from files, on a laptop or a USB stick, through decks and a mixer. Decks are the players: two to four media players, or turntables. The mixer sits between them and blends them. A controller is decks and mixer in one box that steers software; a standalone unit is the same box with the computer built in. The common booth as of 2026 is AlphaTheta's CDJ-3000 players (or their 2025 successor, the CDJ-3000X) around a DJM mixer, fed from a USB stick prepared in Rekordbox. The turntable is still the Technics SL-1200, first made in 1972; the MK2 of 1979 gave it the ±8 % pitch slider that made it the DJ standard. DVS DJs put timecode records on those turntables to steer Serato, Rekordbox or Traktor. At home and at weddings, most play from a laptop and a controller.

What is the rule of 32 in DJing?

Dance music moves in phrases of 32 beats: eight bars of four. Intros, breakdowns and drops start on the first beat of a phrase, usually in blocks of 16 or 32 bars. Start the next track on the first beat of a phrase in the one playing, and their changes land together; start it two bars late and one drop meets the middle of the other's build. One bar lasts 240 ÷ BPM seconds:

How many songs for a 2-hour DJ set?

Count by how long each track plays in the mix. House and techno with long blends: 4 to 6 minutes a track, so 20 to 30 tracks in 120 minutes. Open format, hip-hop and weddings with quick cuts: 2 to 3 minutes, so 40 to 60. Bring about twice what you will play, sorted by tempo and energy, so you can follow the room instead of a list.

How much to charge for 3 hours of DJing?

There is no standard rate: it depends on the city, the kind of event and whether you bring the sound system. Most wedding and mobile DJs quote per event, built from an hourly rate times the hours plus setup, gear and travel. See what three local DJs at your level charge for the same gig, and quote the three hours as one price.

Is DJing difficult to learn? Can it be self-taught?

Plenty of DJs taught themselves, from records and then from videos. The mechanics come first: beatmatching by ear takes weeks of regular practice, not years, and the sync button does it for you anyway. What takes years is the rest: phrasing, EQ, and picking the next track for this room at this hour. Is 27 too old to start DJing? No: at 27 or at 57, nobody in the booth asks. To train the ear, tap a track's tempo on the tap pad, then check it with the BPM counter.

What these tools can't tell you

The BPM counter needs a clear beat; ambient, rubato or very busy music may give no number, and it says so. The key pages show a key you pick; they don't detect a track's key, so take that from your DJ software's analysis or the store. There is no two-deck mixer here. Genre tempos are the usual ranges, not rules.

Producing rather than mixing? The producer tools go from the note to the file. Practising counts without a track? The metronome.

The BPM counter opens the microphone on a tap and closes it when it's done; the sound is read in the browser and nothing is kept or sent. A file you pick is read in the tab, not uploaded. Tap tempo and the genre and key pages need no microphone; their sounds load on the first tap. How the site counts visits.