Beat Sync Tester - Online Tap Tempo & BPM Counter
Tap any key to the beat and get the BPM (beats per minute). Useful for DJs, musicians, and running. Simple and accurate.
UD5 Toolkit
Online step sequencer β create beats, play & export your rhythm patterns
Tap any key to the beat and get the BPM (beats per minute). Useful for DJs, musicians, and running. Simple and accurate.
Upload an MP3 or WAV file and get an estimated beats per minute using onset detection. DJs and musicians can quickly catalog track tempos.
Load a video and visually check if audio aligns with lips. Use frameβbyβframe stepping. Debug playback issues.
Apply compression and limiting to an audio file with threshold, ratio, attack, and release controls. Improve loudness. All local.
Convert WAV audio files to MP3 directly in your browser using a builtβin codec. Choose bitrate and quality. No upload.
Change audio files between MP3, WAV, FLAC, and OGG. Choose codec and bitrate. Works completely offline in the browser.
Track up to 5 habits with a visual chain. Tap to mark day as done, see longest streaks. Data saved in your browser. Inspired by 'Don't break the chain' method.
Log daily sleep to see cumulative sleep debt or surplus over weeks. Visualizes chronic sleep loss trends. Stores data locally in your browser only.
Convert English words into their International Phonetic Alphabet (IPA) representation. For pronunciation learning. Local.
Translate text into semaphore flag positions and decode semaphore back to letters. Interactive animated flags. For scouts and maritime fans.
Compare all CSS easing presets side by side on a bouncing ball. See which curve fits your UI animation.
Paste a Bitcoin, Ethereum, or other crypto wallet address and quickly verify its format and checksum. No connection to blockchain.
Choose your tea type and start a precise steeping timer with colorβchanging background. Never overβsteep again.
Start/stop timer per project to log hours. See daily and weekly totals. Data stays in localStorage. Export summary as CSV. No account needed.
Convert JSONβLD structured data into Turtle (TTL) notation. For semantic web and linked data developers. Clientβside.
Display striped patterns that can cause visual distortion. Learn about visual stress. Switch colors.
Visualize the probability distribution of dice rolls as a colorβcoded heatmap. For any NdM combination. RPG strategist's dream.
Convert numbers between binary, octal, decimal, hex, and any custom base up to 36. With live preview of all bases.
Log the hours you slept each night and rate the quality. See a weekly bar chart. Local storage.
Use a coin for scale and log the size of swelling after an insect sting over time. Detect allergic progression.
Inspect any website's SSL/TLS certificate details: issuer, expiry date, subject, and SANs. Verify certificate chains. All checks are private and require no server upload.
Validate a DNSSEC chain by entering DS and RRSIG records. Verify that signatures match. Educational. Local algorithm.
Enter a domain and see its SSL certificate details: issuer, validity dates, and chain. Clientβside fetch.
Check which cipher suites a website supports and identify weak or outdated ones. Quick security audit from your browser.
Set your desired retirement date and see a live countdown of remaining days, hours, minutes. Totally motivating.
Paste raw email headers and see authentication results (SPF, DKIM, DMARC) in a readable table. Find spoofing attempts.
Click a metal ion to see the characteristic flame color and wavelength. Useful for analytical chemistry reference.
Type a negative thought and see which cognitive distortion it matches. Get a suggestion for reframing. Self-help tool.
Encode any text, including emojis and foreign scripts, into a Base64 string. Perfect for data URLs. Local.
Decode a Base64 encoded string that contains UTFβ8 text (emojis, international characters). See the raw output. Local.