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3623 apps · Showing 961–1056
Video & Audio
141 appsVideo & Audio: Text & overlays
Video & Audio: Create & inspect
Create Audio Spectrum Video
Turn an audio file into a polished spectrum animation with the original sound attached.
Create Audio Waveform Video
Turn an audio file into a shareable video with an animated waveform and the original sound.
Create Photo Slideshow
Arrange up to twelve images, set the pace, and create one clean video with gentle motion.
Create Video Thumbnail
Capture a sharp JPG from an exact moment for covers, posts, and previews.
Extract Frames from Video
Export JPG frames at a chosen interval and download the checked set in one ZIP.
Image to Video
Turn a JPG, PNG, WebP, or AVIF into a playback-ready video with a gentle zoom option.
Inspect Video Metadata
Read container, codec, dimensions, frame rate, duration, audio, subtitle, and tag details in one report.
Video & Audio: Convert
Video & Audio: Audio Analysis
Video & Audio: Music & Sound
ABC Notation Editor
Write ABC music notation and see the score. Listen to the tune and download ABC, SVG or MIDI files.
Ambient Sound Mixer
Mix your own sound loops. Set each volume, choose which clips repeat and use a sleep timer to stop playback.
Audio Clip Marker
Mark clips on an audio waveform. Set exact start and end times, listen to each section and save the timestamps.
Audio Feature Explorer
Explore changes in an audio recording. See charts of sound level and frequency features, then download the measured values.
Folk Tune Transposer
Transpose an ABC folk tune to a new key. Preview the score, listen to the result and download the rewritten tune.
Interval Ear Trainer
Practise hearing the distance between two notes. Choose your musical intervals, listen and check your answers.
Live Audio Effects Playground
Try live effects on an audio file. Adjust volume, filters, left-right balance and echo while listening to the result.
MIDI Piano-Roll Inspector
Open a MIDI file and see its notes on a piano roll. Explore tracks and tempo changes, listen and export note data.
MIDI Transposer
Move MIDI notes up or down in pitch. Choose tracks and note ranges while keeping timing and other MIDI events.
Podcast Chapter Editor
Add chapters to a podcast while you listen. Name each chapter, adjust its time and download the chapter list.
Rhythm Reading Trainer
Practise reading and tapping musical rhythms. Listen to a pattern, tap along and see how close your timing was.
Scale & Chord Finder
Find notes and chords in major and minor scales. See them on a keyboard and listen to each scale or chord.
Sheet Music Snippet Maker
Make a short piece of sheet music from notes and durations. Choose the clef, time signature and tempo, then save the score.
Soundboard Builder
Make a soundboard from your own audio clips. Name each pad, set volumes and play sounds with buttons or keyboard shortcuts.
Stereo Channel Tester
Test your left and right audio channels. Play a tone, adjust its pitch and run an automatic channel check.
Timbre Comparison Tool
Compare the tone and sound level of two recordings. View matching charts and download their measured differences.
Video & Audio: Music Practice
Microphone Instrument Tuner
Tune a single instrument note using your microphone. See the nearest note, frequency and cents sharp or flat with standard A4 = 440 Hz tuning.
Music Practice Metronome
Practise with a steady beat from 30 to 240 BPM. Choose quarter, eighth or sixteenth notes, adjust the volume, and follow the visual beat markers.
Video & Audio: On-Device AI
Video & Audio: Sessions & Timers
Video & Audio: Subtitles
SRT ↔ VTT Converter
Convert subtitle timestamps between SubRip and WebVTT and download the new subtitle file.
Subtitle Language Worksheet
Turn subtitles into a study worksheet with timestamps, original lines, and space for your translation.
Subtitle Overlap Checker
Find overlapping subtitle cues and short gaps in an SRT or WebVTT file.
Subtitle Reading Speed Checker
Measure characters per second for every subtitle cue and find lines that may be too fast to read.
Data & Calculators
1760 appsData & Calculators: Functions & Curves
Data & Calculators: Compare Data
Bubble Chart Maker
Compare x, y, and size at once, with labels and groups that make every bubble easy to inspect.
CSV Scatter Plot Maker
Paste x and y values, colour points by group, and spot clusters, gaps, and unusual results.
Error Bar Chart Maker
Plot measured values with plus-or-minus error bars so uncertainty stays visible beside each result.
Multi-Series Line Chart Maker
Draw one or more ordered lines from CSV data and compare how each series rises or falls.
Data & Calculators: Distributions
Box Plot Maker
Compare medians, quartiles, ranges, and unusual points across one or more groups.
Histogram Maker
Group measurements into bins and see where values gather, spread out, or form more than one peak.
Violin Plot Maker
Show the full density shape of grouped measurements while keeping the median and inner box visible.
Data & Calculators: Grids & Fields
2D Density Contour Plot Maker
Estimate where x and y observations gather and show their density as filled contour bands.
Contour Plot Maker
Turn gridded measurements into smooth contour bands that reveal peaks, valleys, and boundaries.
Matrix Heatmap Maker
Convert row, column, and value data into a colour grid with hover values and a clear scale.
Data & Calculators: 3D Science
3D Scatter Plot Maker
Plot x, y, and z values in a rotatable space, then colour groups and inspect point labels.
3D Surface Function Plotter
Type a two-variable formula and rotate a smooth 3D surface to inspect peaks, bowls, waves, and saddles.
3D Vector Field Maker
Draw vectors from x, y, z positions with u, v, w direction values in a rotatable cone field.
Data & Calculators: Special Coordinates
Polar Plot Maker
Turn angle and radius values into circular traces for direction, cycles, and radial measurements.
Radar Chart Maker
Compare several profiles across the same named categories with clear filled radar shapes.
Ternary Plot Maker
Plot three values that form a whole, such as material blends, soil mixes, or survey shares.
Data & Calculators: Finance & Change
Data & Calculators: Many Variables
Correlation Matrix Heatmap
Calculate pair-by-pair correlations across numeric columns and see strong positive or negative links.
Parallel Coordinates Plot Maker
Turn each numeric column into an axis and follow every row across a high-dimensional profile.
Scatter Plot Matrix Maker
Build a grid of scatter plots so every numeric column can be compared with every other column.
Data & Calculators: Math Calculators
30–60–90 Triangle from a Known Measurement
Calculate 30–60–90 triangle from a known measurement with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.
45–45–90 Triangle Equal Legs and Size
Calculate 45–45–90 triangle equal legs and size with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.
Absolute Value of a Real Number
Find a real number’s nonnegative distance from zero.
Acute-Branch Rhombus Area, Diagonals and Height
Calculate acute-branch rhombus area, diagonals and height with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.
Antilog & Logarithm with a Chosen Base
Convert a logarithm value back to its number with a positive base, or recover the logarithm from the number.
Arccosine Principal Angle & Cosine Ratio
Find the principal angle for a cosine ratio, or solve the ratio from an angle between 0° and 180°, with nine angle units.
Arcsine Principal Angle & Sine Ratio
Find the principal inverse sine angle from a ratio, with negative angles, reverse entry and degrees, radians, turns or arc units.
Arctangent Value and Principal Angle Conversion
No. It selects one principal angle in the open interval from −π/2 to π/2. Tangent repeats periodically, but angles outside this branch are rejected in the backward control.
Area Calculator
Calculate area and perimeter for rectangles, circles, triangles, trapezoids, and ellipses.
Average Calculator
Calculate arithmetic mean, median, sum, count, minimum, and maximum for a list of numbers.
Base, Exponent and Power with Inverse Inputs
Base, Exponent and Power with Inverse Inputs. Evaluate a real power or principal root, with reverse inputs where a unique solution exists.
Basic Calculator
Evaluate arithmetic with parentheses, powers, percentages, and standard operator precedence.
Big Number Calculator
Perform exact arithmetic on integers larger than JavaScript's ordinary safe-number range.
Binary Calculator
Perform exact arithmetic on binary integers and convert the result to decimal and hexadecimal.
Binary Logarithm & Power of Two
Find log₂(x) for a positive number, or recover x from its base-two logarithm.
Cartesian & Polar Coordinates in Both Directions
Convert x/y coordinates to radius and angle, or radius and angle to x/y, with quadrant-aware angles and selectable angle units.
Cartesian Distance Between Two Spatial Points
No. This workflow retains the six coordinate inputs and a read-only distance result. A distance equation can have reflected coordinate solutions, which this tool does not select.
Cartesian Point Distance and Positive-Branch Coordinates
The solver adds the positive square root to the other point’s matching coordinate. A reflected point can have the same distance. The requested distance must be at least either known axis separation.
Central Angle from Arc Length and Radius
Yes. This model divides positive arc travel by radius and keeps the accumulated angle. It does not reduce the result to a minor arc or one revolution.
Choose k from n: Binomial Count
Count unordered selections of k distinct objects from n, without replacement.
Circle Arc Length with Sector Area and Chord Controls
Calculate circle arc length with sector area and chord controls with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.
Circle Boundary Length and Enclosed Area
Circumference measures boundary length and uses length units. Enclosed area measures the disk and uses squared length units. Both can determine the positive radius of the same circle.
Circle Boundary Length from Radius or Diameter
Calculate circle boundary length from radius or diameter with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Calculator
Find diameter, circumference, area, and equations from a circle radius.
Circle Center from Standard, General or Parametric Form
Find a circle’s center from one of three equation forms, with explicit coefficient meanings.
Circle Diameter and Radius Conversion
Calculate circle diameter and radius conversion with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Diameter Recovered from Area
Calculate circle diameter recovered from area with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Equations, Center, Radius & Geometry
Connect a circle’s center and radius with standard, general and parametric coefficients, area and circumference.
Circle General ↔ Standard Form Coefficients
Convert the coefficients of a normalized circle equation to or from its center and squared radius.
Circle Measurements with a Zero-Radius Boundary
Calculate circle measurements with a zero-radius boundary with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Radius from Circumference or Its Pi Coefficient
In full-circumference mode enter 28*pi. In π-coefficient mode enter 28. The coefficient field already supplies the π factor; adding another pi would multiply it twice.
Circle Radius Recovered from Boundary Length
Calculate circle radius recovered from boundary length with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Radius, Diameter, Boundary and Area
Calculate circle radius, diameter, boundary and area with bidirectional inputs, compatible units and clear geometric assumptions.
Circle Radius, Diameter, Circumference and Area
Enter a positive radius, diameter, circumference or area. The other values describe the same circle. Area-to-radius solving uses the positive square root, and length and area use different unit dimensions.
Circular Area with Square-Foot Unit Controls
Calculate circular area with square-foot unit controls with bidirectional inputs, compatible units and clear geometric assumptions.
Circular Area with Square-Inch Unit Controls
Calculate circular area with square-inch unit controls with bidirectional inputs, compatible units and clear geometric assumptions.
Circular Frustum Volume with Perpendicular and Slant Height
Circular Frustum Volume with Perpendicular and Slant Height. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.
Circular Perimeter from Enclosed Area
Calculate circular perimeter from enclosed area with bidirectional inputs, compatible units and clear geometric assumptions.