Free • No Sign-Up
SYNTHLUCIDA APPS
A collection of free, independent web apps by SYNTHLUCIDA. Every tool below runs standalone right in your browser and can be installed on your phone, tablet or computer like a native app — no App Store, no Google Play, no account required.
How to install any app from your browser:
- Android (Chrome): open the app's page → tap the ⋮ menu in the top right → "Add to Home screen" or "Install app".
- iPhone / iPad (Safari): open the app's page → tap the Share icon ⬆️ → "Add to Home Screen".
- Desktop (Chrome / Edge): open the app's page → click the install icon ⊕ in the address bar → "Install".
Relaxation & Wellness
RelaxPlayer
The free ambient music player at the heart of SYNTHLUCIDA — curated ASMR, Piano and Chill playlists, 20 visual themes with weather and sky effects, guided breathing, sleep timer and an XP system that unlocks downloads.
Open App ↗Ambient Flow
A calming ambient soundscape with a drifting starfield night sky, a built-in synth tone sequencer, nature sounds, binaural audio and a timer — perfect for relaxing, unwinding or falling asleep, right in your browser.
Open App ↗UklidniTo
A free online breathing exercise, no sign-up or install needed. Eight science-based techniques (4-7-8, Box, Coherent, Calm and more) with a pulsing visual orb guiding your inhale, hold and exhale, plus optional progress tracking — calendar, mood, energy and sleep.
Open App ↗Noctuary Tarot
A free tarot card-of-the-day site, with a monthly horoscope option for all 12 zodiac signs.
Open App ↗Practical Tools
Weather
A free weather tool from SYNTHLUCIDA — current conditions plus a multi-day outlook for any location, clean and fast, no sign-up required.
Open App ↗Trip Cost
A free car trip cost calculator. Enter distance, fuel consumption and fuel price and instantly see how much your trip will cost — in total and per person.
Open App ↗Vehicle Logbook
A free online mileage log. Record trips by odometer reading, purpose (business/private) and vehicle, track monthly summaries, and export records to PDF, CSV and JSON.
Open App ↗Payday
A free Czech net salary calculator. Enter your gross salary and instantly see your take-home pay, tax and insurance deductions.
Open App ↗Spirit Level
A free digital spirit level and inclinometer right in your browser. Uses your phone's gyroscope and accelerometer to level surfaces or precisely measure slope and angle, no app install required.
Open App ↗Mixing Lab.
A free e-liquid mixing calculator for vapers. Enter bottle size, target nicotine strength and PG/VG ratio, and it works out exactly how much base, nicotine shot and flavoring to mix.
Open App ↗Productivity & Documents
Xtally Documents
A free browser-based document editor with ready-made templates (CV, invoice, contract, letter), real Word (.docx) import and export, and offline support as an installable PWA. Nothing is uploaded — everything stays on your device.
Open App ↗Xtally Sheets
A free browser-based spreadsheet editor with a full formula engine, ready-made templates (budget, invoice, tracker), and real Excel (.xlsx) import and export. Works offline as an installable PWA, nothing is uploaded.
Open App ↗Xtally Scanner
A free browser-based document scanner — capture pages with your camera or upload photos, with automatic edge detection, perspective correction and filters, then export a clean multi-page PDF. Works offline as an installable PWA, nothing is uploaded.
Open App ↗Creative & Music
SYNTHLUCIDA Webzenith
A SYNTHLUCIDA tool for quick and easy website building right in the browser, no coding required.
Open App ↗Synthlucida SEOCHECKER
A free SEO checker tool. Scan any page and get an instant checklist of fixes for meta tags, headings, images and more — right in your browser, no sign-up.
Open App ↗Progrese
A free online chord progression generator. Pick a key and mood, get an auto-generated melody, bass and arpeggio with in-browser playback, and export the result as MIDI.
Open App ↗DZMASTER
A free automatic WAV mastering tool that runs entirely in your browser. Upload a track, pick a target platform, and get a mastered, ready-to-download file — nothing is ever uploaded to a server, no sign-up required.
Open App ↗Lifestyle & Tracking
Vapetrack
A free e-cigarette puff tracker right in your browser. Log puffs with one tap, see daily counts, trend charts and a 365-day heatmap, set a daily goal, and back up your data as PDF, CSV or JSON.
Open App ↗Dělňas
A free work-shift and wage tracker for piecework/norm-based jobs. Set up your own tasks and wage tiers, log your shifts, and the app estimates your pay, hourly wage and XP/level, with trend charts and a yearly heatmap.
Open App ↗