Delay and reverb calculator
The milliseconds of every note value at a given tempo, dotted and triplet included, with a suggested pre-delay.
en / tools
The utilities I actually use
They run in your browser. No account, nothing stored, nothing sent anywhere — this site has no server to send it to.
Filter by category
47 tools shown
01
Music
Note to frequency
Frequency, MIDI number, period and wavelength of any note, with an A4 reference adjustable from 432 to 446 Hz.
Music paper
The stave of a melody, a listen, and fresh bars generated in the key and scale you choose, downloadable as a MIDI file.
Tuner
Tune guitar and bass from the microphone, with ten tunings, an adjustable A4 reference and the offset read in cents. It picks the audio input and can play the note you are looking for.
Tap tempo
The tempo of a track by tapping it with your finger or your keyboard, with the average, the spread and the nearest round value.
Metronome
A click that does not drift, from 30 to 300 BPM, with an accent on the first beat, subdivisions, and a tempo you can tap in.
BPM and length
How long a section lasts, what tempo makes it last that long, how many bars fit — in any metre, odd ones included.
Chord progressions
Twenty progressions in twelve keys, with symbols and degrees, an arpeggiated listen and a direct hand-off to the music paper.
Drone
A held note to tune, pitch or improvise against, with an adjustable reference and a just fifth.
Circle of fifths
The twelve major keys with their relative minors, and a map of how you get from one key to another.
Ear training
Recognise intervals and chords by ear. Four levels, keyboard answers, a session score with accuracy per type.
Guitar amplifier
Plug the guitar in and play in the browser. Three channels, tone, a simulated cabinet and a recording you can play back and download.
Find the key
Switch on the notes you played and get the keys that contain them, ranked, with the notes left outside and the ones you have not touched yet.
What chord is this
Press the notes on two octaves of keyboard and get the name of the chord, symbol and spelled out, with the inversion when the bass is not the root.
Note reading quiz
One note at a time on the stave, you say which. Treble and bass clef, three levels, score, streak and average time.
02
Gaming and streaming
Click and reaction test
How many clicks per second you can manage, and how long you take to react to a signal, averaged over five attempts.
Dice roller
Dice in XdY notation, with modifiers, keep-highest, advantage and disadvantage, and the evening's history.
Webcam and microphone test
Check that your camera and microphone work, with the detected resolution and a live audio level. Nothing is recorded.
Keyboard test
Press a key and watch it light up on the drawing. Shows the key code, how many you are holding at once, and which ones you have already tried.
Stream countdown
A countdown to put on screen with OBS. Length or clock time, text above and below, transparent background.
Random picker
Write a list, draw one entry. Cryptographic draw, an option to remove whoever has come up, shareable link.
Soundboard
Load your own sounds, map them to keys and fire them while you stream. Overlap, hold-to-play and a panic stop.
03
Text and study
Word and character counter
Words, characters, sentences, standard pages and reading time, with the limits for X, Instagram and the meta description.
Typing speed
How many words a minute you actually type, in English or Italian, with the accuracy and the errors that remain.
Pomodoro
Twenty-five minutes and five, adjustable, with the long break on the fourth round and a sound that arrives on time even in the background.
Text readability
Paste a text and get the GULPEASE index in Italian or Flesch in English, with over-long sentences marked and the words you repeat.
04
Development
JSON formatter and validator
Paste some JSON, find out whether it is valid and where it breaks, with line and column when the browser gives them.
Timestamp converter
From epoch to date and back, in seconds or milliseconds, with ISO 8601 and the time in any zone.
UUID generator
Version 4 UUIDs, one at a time or in batches, in lowercase, uppercase, without hyphens or in braces.
JWT decoder
A token's header and payload, with readable dates and glossed claims. The signature is not verified, and the tool says so.
px, rem, em converter
The three units live together, with a configurable base and the typographic scale of the value on exact ratios.
Subnet calculator
Network, broadcast, range and usable hosts of an IPv4 block, with the two exceptions almost no calculator explains.
05
Office
Convert files
Your files never leave your browser. Images, spreadsheets, documents and PDFs go in together, and each one says for itself what it can become.
Compare two lists
Paste two lists and see who is only here, only there, and in both, with counts and a button to copy each column.
Email signature generator
Fill in the fields, see the preview and copy the signature ready to paste. Table with inline styles, no external images, works with Outlook and Gmail.
Quick quote
Items, discount, VAT and total, with a free rate and Swiss and Italian presets. It prints as an A4 document, with the client's address set for a window envelope.
Shift rota
People down the rows, days across the columns, and the shifts split fairly. Mark who is away by clicking a cell, and the real spread is always written.
Merge and split PDF
Several PDFs into one, or just the pages you need out of a big one. Reordering, ranges, rotation. All in the browser, the files never leave.
Images to PDF
Photographs and scans into one PDF, one per page. Page size, orientation and margins are yours to pick. All in the browser, the files never leave.
XLS to XLSX
An old .xls spreadsheet becomes an .xlsx that opens anywhere. It also reads CSVs and HTML tables disguised as Excel. All in the browser, the file never leaves.
DOC to DOCX
Recovers text and tables from an old .doc into a clean .docx. It also reads RTF files and web pages disguised as Word. All in the browser.
06
Image
Palette generator
From one base colour to five harmonies, with the contrast ratio of black and white on every swatch and export to CSS.
Palette from image
Drop an image and pull out three to eight dominant colours, with hex and contrast. The image stays in your browser.
Compress and resize images
Drop the photos in, pick the long side and the quality, see what they weigh before and after. Up to twenty at a time, all in the browser.
Convert image format
PNG to JPG, to WebP and back. The size stays, the quality is yours, and under the transparency you put the colour you want.
07
Stage
Stage teleprompter
Paste your text and read it large, with automatic scrolling at an adjustable speed, a mirror for the glass and a corner timer. The text is never stored anywhere.
Vocal warm-up
A guided sequence of eight exercises with a timer. Three lengths, forward and back, a chime on change if you want one.
No tools match these filters.