Type a word in English or Czech - e.g. rain, déšť, piano, noc, moře.
Tap the ♥ next to any track in the playlist, or the + next to a track in HISTORY, to add it here. Reorder with ▲▼ (or drag tracks with the mouse), then hit PLAY to listen through your own list, in exactly the order you built it.
Choose which photos WEATHER: SUN rotates: a MIX of the 9 default and your own photos, only the DEFAULT ones, or only YOUR OWN. Reorder photos with ▲▼ or by dragging them with the mouse; default photos can't be removed. Add your own below - originals stay untouched and everything is stored only on this device. Press SAVE to keep your choice.
Experience 24/7 uninterrupted streaming. Enjoy continuous, free listening. Whether you need background music for focus, deep relaxation, or daily activities, this stream provides the perfect atmospheric soundtrack. Find out more at www.SYNTHLUCIDA.com.
Relax Player is a quiet place for ambient music — a continuous stream of ASMR, piano and chillout that you open in your browser and simply let play. No account, no sign-up, nothing to set up. It rests on one idea: listening should be effortless, and the screen can be as calming as the sound coming from it.
Three moods, one stream. ASMR brings rain, waves, crackling fire and birdsong. Piano is slow and spacious, with room between every note. Chill adds warm synth pads and a gentle downtempo pulse. Switch between moods without interrupting the music, and the player remembers where you left off.
Layer your own soundscape. In the ASMR playlist tap the layers button and pick a second ASMR track: it loops together with the first, and a small knob sets its volume separately. Rain with distant thunder, a stream with birdsong, a campfire under a night sky — mix until it sounds right and save the blend for next time. It also works in MY PLAYLIST and in your own playlists, as long as they contain an ASMR track.
A look for every mood. Twenty-eight colour themes recolour the whole interface and its glow — from deep space and a starry night sky with a quietly shining moon to a warm sunset with flying birds. Live weather — sun, rain, snow and even a windier blizzard — can be laid over any theme, so the screen breathes along with the music.
Breathing and sleep. Five guided breathing techniques — 4-7-8, Box, Coherent, Calm and Sigh — are shown as a slowly pulsing orb (or, if you prefer, a turning mandala) that you simply follow, and you can add a rhythm of your own. For moments when the body needs movement before breath, there are short stretches, and the TOGETHER room where everyone breathes 4-7-8 in the same second, with an evening group session at 21:00 Prague time. The sleep timer ends listening after 15, 30 or 60 minutes, and gentle reminders invite you to take a small pause during the day. Most of it runs locally on your device.
Binaural beats. Put on stereo headphones and choose a wave — DELTA for deep rest, THETA for meditation or ALPHA for calm relaxation. Two slightly different pure tones, one in each ear, merge into a slow, gentle pulse. Separate knobs set the tones and the music, so you can lay a favourite track over them, and the sleep timer fades everything out once you fall asleep. It is an aid to relaxation, not a treatment.
Your own listening. Add any track to My Playlist with the heart, reorder it, and export or import the whole playlist as a file. My Files lets you upload your own audio and mix it with the SYNTHLUCIDA catalogue in named playlists. Crossfade softens the transitions between tracks, History remembers what you listened to, and offline download keeps the music in the installed app even without a connection. Listening also quietly collects levels and experience, which gradually unlock track downloads.
Small worlds to explore. Card of the Day for a short moment of reflection. An interactive night sky where you play a generative synthesizer, layer binaural waves and nature sounds, and watch the real phase of the moon. SYNTHLUCIDA BLOCKS, a falling-blocks game in which every cleared line unlocks more music. And a drawing canvas where parts of a picture can be brought to life — a wing that flaps, a star that twinkles.
Relax Player is free, runs in any browser on phone and computer, and is also available for Windows in the Microsoft Store. It grows slowly and carefully, and every part of it comes from a sincere love of ambient and electronic sound. I wish you a few calm minutes — or a long, quiet evening. — Dave, SYNTHLUCIDA
Yes. The player is free to use, with no account and no registration.
Yes, inside the installed app. Use DOWNLOAD OFFLINE to save the current playlist for offline playback. Offline listening works only in the installed app, not in a regular browser tab.
Yes. It runs in any modern mobile or desktop browser, and you can add it to your home screen like an app.
Yes, stereo headphones. Each ear receives a slightly different tone, so on speakers or in mono the effect disappears.
Yes. Add your own audio files in My Files, build playlists from them, and mix them with SYNTHLUCIDA tracks in My Playlist.
Have a suggestion for improvement, or is there a feature you miss? Feel free to contact me using the form below.
Use the center button to play or pause the current track, and ⏭ to skip to the next one. Tap 🔀 to shuffle the playlist or 🔁 to repeat the current track. Drag the progress bar to seek to any point, and use the slider to adjust the volume. The 🔆 button underneath keeps your screen from dimming or locking while it's on, so playback stays visible during a session — tap it again to let your screen sleep normally. Browsing a different playlist than the one that's playing? Tap the 🔍 next to the time to jump straight back to the playing track - the main window switches to its playlist (or to MY PLAYLIST), scrolls to the track and makes it light up for a moment.
Tap MUSIC at the top of the screen to open the ASMR, PIANO and CHILL playlists (the button shows the one you are on), and EXPLORE to open GAME, RELAX, DRAWING (separate pages with their own soundscapes), FORECAST (the SYNTHLUCIDA weather page, opened in a new tab) BREATHE (a guided breathing session), BINAURAL (calming binaural beats - see Binaural beats below) and SEARCH (find a track by name). The playlist you last listened to is remembered automatically the next time you open the player. Feeling like a surprise? Tap the small 🎲 to the left of MUSIC: it picks a completely random track from all playlists except ASMR, starts playing it and shows its playlist below. Shuffle then switches on (the 🎲 and 🔀 buttons light up), so when the track ends the player keeps picking random tracks from that playlist - tap 🔀 again to turn it off.
Tap EXPLORE and then SEARCH to open the search window. Type a word in English or Czech - for example rain, déšť, piano, moře or noc - and matching tracks from ASMR, PIANO and CHILL appear as you type (capital letters and accents don't matter, and Czech words are matched to the English track names). Tap a track to jump straight to its playlist in the main window, where it scrolls into view and lights up for a moment, or tap the ▶ next to it to play it right away. Press Enter to open the first result. If no track contains all your words, the closest matches are shown.
Tap 🎨 and choose from 28 themes — NEON, SPACE, EARTH, SYNTH, DARK, BLOOD, AQUA, GOLD, MATRIX, AMBER, LAVENDER, AURORA, SAKURA, FROST, ROSEGOLD, ROYAL, CORAL, TOXIC, PLASMA, MINT, SOLAR, NEBULA, EMERALD, COBALT, CRIMSON, PEACH, OBSIDIAN and SAPPHIRE — to change the colors and ambient glow of the player. NEON and AURORA shift gently over time on their own. At the bottom of the theme list, ◐ 2 COLORS lets you combine any two colours: pick COLOR 1 for the top of the player and COLOR 2 for the bottom, and the whole interface blends smoothly from one to the other. SWAP flips them, OFF returns to a single theme, and SAVE remembers your mix.
WEATHER cycles through four states: a warm SUN scene with drifting light and birds crossing the sky, a soft falling RAIN animation, a quiet WINTER scene with gently falling snow, then a windier WINTER II blizzard with slanted, faster snow. SUNSET cycles through three states: a warm sunset gradient, a second sunset variant SUNSET II, then a living starry NIGHT sky with a softly glowing moon. Both WEATHER and SUNSET/NIGHT can be combined with any visual theme, and are remembered when you save your settings. WEATHER and SUNSET don't mix freely: SUN (your photos) runs alone, so switching it on turns SUNSET/NIGHT off and the other way round; RAIN, WINTER and WINTER II can be combined only with NIGHT, never with SUNSET or SUNSET II. While RAIN or WINTER is on, the SUNSET button therefore skips straight to NIGHT, and while NIGHT is on, the WEATHER button skips SUN. Tap ＋ PHOTO next to WEATHER to add your own photos to the SUN rotation — pick one or several from your device and they join in after the built-in sunset photos, stored only on your device.
In BREATHE, the TOGETHER button opens a shared room where everyone who is there breathes 4-7-8 in the same second. You see how many people are breathing with you, can send a heart (SEND CALM) and invite a friend. Every evening at 21:00 (Prague time) there is a shared 10-minute session — you can download a calendar reminder.
Tap EXPLORE and then BREATHE to open a full-screen guided breathing session with a slowly pulsing orb. Inside that screen, its own ⓘ icon opens a dedicated guide explaining each breathing technique — 4-7-8, Box, Coherent, Calm and Sigh — in detail. The WEATHER button below the START and STOP buttons on the breathing screen switches on the same weather scenes and photos as in the player.
Tap EXPLORE and then BINAURAL to open a calm full-screen page for binaural beats - two slightly different pure tones, one in each ear, that your brain blends into a slow, gentle pulse. Put on stereo headphones (on speakers or in mono the effect disappears) and pick a wave: DELTA (2 Hz, deep rest and sleep), THETA (5 Hz, meditation) or ALPHA (9 Hz, calm relaxation); OFF turns the tones off. There are three knobs: TONES sets only the binaural tones (default 5 %), GAIN sets how loud TONES gets at 100 % (0 to +15 dB, default +12 dB) and MUSIC sets the music from the mini player (the same volume as in the main window). Keep the tones quieter than the music and raise them slowly. Drag a knob up or down, scroll over it or use the arrow keys, and double-tap to reset it. The mini player at the bottom works just like the one in BREATHE (ASMR, PIANO, CHILL, MY PLAYLIST and your own files), so you can layer music over the tones. Under the knobs you can set the sleep timer (15, 30 or 60 minutes, ✖ cancels it) - it is the same timer as in the main window, and when it ends the tones fade away and the music stops. The selector under the title switches between the ORB and an analog VU meter that shows the level of the TONES, of the MUSIC, of both together (MIX), or the RATIO of tones to music (needle to the left = music is louder, to the right = tones are louder). The ⓘ icon on the page opens a detailed guide. The tones also fade out when you leave the page with ✖. Binaural beats are a relaxation aid, not a treatment: do not use them while driving or when you must stay alert, and consult a doctor first if you have epilepsy, a heart condition, a pacemaker, a mental-health condition or are pregnant.
Set playback to stop automatically after 15, 30 or 60 minutes using the timer buttons, or cancel an active timer at any time with ✖. The same timer also works on the BINAURAL and BREATHE pages and fades out the binaural tones.
Choose 3, 6, 8, 10 or 15 seconds under CROSSFADE to smoothly blend the end of one track into the start of the next, or leave it OFF for a hard cut.
🕘 HISTORY shows the tracks you've recently played, with the playlist and time. Tap a track name to play it again, use 📄 EXPORT TXT to save the list as a text file to your device, or CLEAR HISTORY to reset it.
Tap the ♥ next to any track in the playlist, or the + next to a track in HISTORY, to add it to 🎵 MY PLAYLIST — tap the heart again to remove it, and your picks stay marked between visits. Reorder tracks with ▲▼ (or drag them with the mouse) or remove them with ✕, then hit PLAY to listen through your own list in exactly that order — it works alongside Shuffle and Repeat just like a normal playlist. Use 📄 EXPORT TXT to save a readable list, 💾 EXPORT PLAYLIST to save a file you can load back in later, and 📂 IMPORT PLAYLIST to load a playlist you saved before. Want to sort tracks by mood? In the My Playlist panel tap ＋ SECTION, type a name such as Sleeping, Studying or Meditation, then tap the 📁 button on a track to move it into a section (up to 12 sections). Choose a section above the list and PLAY will play only that section; the other tracks stay in your playlist.
Just using SYNTHLUCIDA earns you XP: about 2 XP per minute of listening, 4 XP for every track you listen to for at least 20 seconds (quickly skipping through tracks won't earn XP), 20 XP for every BREATHE session you keep going for at least a minute, and a 30 XP bonus for every new day you open the app — so a daily visit and a steady streak pay off. Every 180 XP takes you up a level. Once a track is hearted (♥) into 🎵 MY PLAYLIST, your growing XP gradually unlocks it for a real ⬇ MP3 download to your device — one track at a time, in the order you added them, costing 270 XP per unlock. Tracks you add from your own uploaded files in My Files don't take part in this — they're already on your device, so they stay unlocked and don't take up an unlock slot. Open the S button to see your level, XP progress and which tracks are unlocked.
Tap the F button to open My Files. Use ＋ ADD AUDIO FILES to upload your own tracks from your device, then CREATE a playlist and build a mixed playlist by adding both your own files and SYNTHLUCIDA tracks to it, right there in the F section. Tap the ▶ next to a playlist (or ▶ PLAY once it's expanded) to play it immediately with the regular player controls, including shuffle, repeat and crossfade. You can also tap the ♥ on any playing track to add it to MY PLAYLIST on the home screen, so picks from different playlists - your own files included - can be combined into one running order. Your files and playlists stay only on this device and are never uploaded anywhere.
SAVE stores your current theme, effects and other preferences so they load automatically the next time you visit. FULLSCREEN hides the browser interface for a cleaner, distraction-free view.
⬇ DOWNLOAD OFFLINE saves the current playlist for offline playback. Offline listening works only inside the app, not in a regular browser tab.
Tap 💬 below the slogans to send a short message (up to 60 characters) to everyone currently listening. It appears live in place of the next slogan for everyone, for about 10 seconds, alongside your own — and other listeners can react to it with 🔥❤️🙏✨👍👎 (no replies, just reactions). You can send one message per minute. Messages aren't tied to any account and aren't stored on your device.
Tap 🔔 REMINDERS to turn on gentle local reminders. The first time you enable them, your browser will ask for notification permission — allow it. Pick how often you want a nudge (every 15m, 30m, 1h, 2h or 4h), and from then on you'll get a short notification with a calming message, popping up the same way any other app notification does (banner, lock screen or notification shade, depending on your device). Use TEST NOTIFICATION any time to see one right away. Everything happens locally on your device - nothing is sent to any server. Reminders keep firing while the app is open or running in the background; if your phone or browser fully closes the app, they pause until you open it again - that's a limit of how browsers work, not a bug. Turn them off anytime from the same 🔔 REMINDERS panel.
Tap EXPLORE and then CARD to open a small tarot card draw on its own page. Every time you open it, a card is pulled truly at random from the full 78-card deck and shown upright or reversed, with its meaning explained in both English and Czech - a quiet, atmospheric moment offered just for reflection, not prediction. Tap 🔀 there for a fresh card, or ✕ to come straight back to the player.
SYNTHLUCIDA · www.SYNTHLUCIDA.com
A quiet look at your listening and breathing habits over time, kept only on this device.
Just using SYNTHLUCIDA earns you XP: about 2 XP per minute of listening, 4 XP for every track you listen to for at least 20 seconds (quickly skipping through tracks won't earn XP), 20 XP for every BREATHE session you keep going for at least a minute, and a 30 XP bonus for every new day you open the app — so a daily visit and a steady streak pay off. Every 180 XP takes you up a level. Once a track is hearted (♥) into 🎵 MY PLAYLIST, your growing XP gradually unlocks it for a real ⬇ MP3 download to your device — one track at a time, in the order you added them, costing 270 XP per unlock. Tracks you add from your own uploaded files in My Files don't take part in this — they're already on your device, so they stay unlocked and don't take up an unlock slot. Open the S button to see your level, XP progress and which tracks are unlocked.
Stats are stored locally in your browser and are never sent anywhere.
Add your own audio files and build playlists that mix them with SYNTHLUCIDA tracks. Everything plays through the same player below - shuffle, repeat, crossfade and the sleep timer all work with it too.
Uploaded files and playlists are stored locally in your browser and are never sent anywhere.
Get a gentle local notification every so often, reminding you to pause and breathe. Nothing is sent to any server - it's just your browser's own notification system.
Works while the app is open or running in the background. If your phone or browser has closed the app completely, reminders pause until you open it again - that's a platform limit, not a bug.
Everything below happens on the F panel (My Files & Playlists) - here's exactly how to add your own audio, mix it with SYNTHLUCIDA tracks, and build your own playlists.
Open the F panel and tap ＋ ADD AUDIO FILES. Pick one or more audio files from your device - they upload instantly, with nothing sent anywhere; each file is stored locally in your browser and shows up under "Your Files". Tap a file's name to play it right away on its own, or tap ✕ to delete it (this also removes it from any playlist it was added to).
Under "Your Playlists", type a name and tap CREATE. Open the new playlist card and use the dropdown to add items to it one at a time - it lists both your uploaded files and every SYNTHLUCIDA track, so you can freely interleave your own audio with ASMR, PIANO, or CHILL tracks in any order. Reorder items with ▲▼ (or drag them with the mouse) or remove them with ✕. Tap ▶ PLAY on the playlist card to play it straight through your own list, start to finish.
There's a second, simpler way to mix: play one of your own files (or open any SYNTHLUCIDA playlist), then tap the ♥ next to a track to add it to MY PLAYLIST - the same heart-based playlist you use for SYNTHLUCIDA tracks. Add a few of your own files and a few SYNTHLUCIDA favorites this way, and a single MY PLAYLIST run will shuffle or play through both together.
Playlists built from your own files play through the exact same engine as the rest of the app - Shuffle, Repeat, Crossfade, and the sleep timer all work with them too, and the last one you played is remembered the next time you open the app.
Uploaded files, your playlists, and MY PLAYLIST are all stored only on this device and are never uploaded anywhere.
Sit comfortably and follow the glowing orb: it expands on the inhale, holds steady and shimmers during a hold, and shrinks on the exhale. Breathe through the nose when the technique doesn't say otherwise. Pick whichever technique fits the moment — you can switch anytime.
Inhale quietly through the nose for 4s, hold for 7s, then exhale completely through the mouth for 8s. Popularized by Dr. Andrew Weil, this ratio is widely used to ease anxiety and wind down before sleep by shifting the body toward a "rest and digest" state.
Inhale for 4s, hold for 4s, exhale for 4s, hold empty for 4s. An equal-count pattern used by Navy SEALs and first responders to stay calm and sharply focused under pressure.
Inhale and exhale evenly for about 5.5s each — roughly 5-6 breaths per minute. Studied as a resonance frequency in heart-rate variability (HRV) research, linked to better vagal tone and stress resilience over time.
Inhale for 4s, exhale for 6s, making the out-breath longer than the in-breath. A longer exhale stimulates the vagus nerve and slows the heart rate — a quick way to downshift after a stressful moment.
Two inhales through the nose (one long, one short "sip" on top of it), followed by one long, slow exhale through the mouth. Studied at Stanford's Huberman Lab as one of the fastest ways to lower physiological stress in real time.
Tap the pencil button to set your own inhale, hold and exhale lengths. Save it and it stays available here. Choose a rhythm that feels comfortable and don't strain.
General relaxation information only — not medical advice. If you feel dizzy or unwell, breathe normally and stop.
Light stretches you can do anywhere in a few minutes, no equipment needed. Pick one for the spot that feels most tense, or run through all five as a short routine — then come back to the breathing.
Sit or stand up straight, shoulders relaxed away from your ears. Slowly tilt your head toward your right shoulder until you feel a gentle stretch on the left side of your neck. Hold for 15–20 seconds, then return slowly and switch sides.
Releases tension in the neck — one of the first places stress settles.
Let your arms hang loosely at your sides. Slowly roll your shoulders backward in big, slow circles — up, back, down and forward. After 5–8 rounds, reverse the direction.
Gets blood flowing through the upper back and helps drop tension from hunched shoulders.
Stand with feet hip-width apart. Slowly bend forward from the hips, knees softly bent, letting your head and arms hang loosely toward the floor. Let your head and neck fully relax, breathing calmly.
Stretches the back and neck — the inverted head position briefly calms the nervous system.
Stand up and gently shake out your hands from the wrists, as if flicking off water, then add your whole arms. Next, balance on one leg and shake out the other, then switch sides.
A fast physical reset that helps discharge built-up nervousness and adrenaline.
Lie on your back (or sit), pull both knees toward your chest and gently hug them with your arms. Let your head rest, relaxed, and breathe slowly into your belly.
Gently stretches the lower back and creates a sense of safety, similar to a curled-up resting position.
Tip: they work best back to back as a short 2–3 minute routine, followed right away by a few minutes of guided breathing — first release the body, then calm your breath and mind.
General relaxation information only — not medical advice. Stop if anything hurts or you feel unwell.