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Two panels sliding in opposite directions from one set of controls.

Tap cups to fill a big glass and watch your daily total rise.

An auto-advancing carousel with manual controls that reset the timer.

A user list that filters as you type, against a real API.

Generate a password from your chosen character sets and copy it.

Type comma-separated options, watch it cycle, and land on one.

A transparent nav that turns solid and compact once you scroll.

Stacking toasts that appear on demand and dismiss themselves.

This challenge uses your Battleship Game Engine to create a presentation layer using Discord's bot API to allow you to play the game via a Discord…

The goal of the Bit Masks app is demonstrate how to use bit masks to evaluate longer sequences of switches without having to rely on long strings of…

### Constraints - The developer will need to select the bug icons to be used in the game - The developer should randomly adjust the speed of each bug…

The goal of the Calorie Counter app is to help the user address nutritional needs by counting calories for various foods.

Real-time chat interface where multiple users can interact with each other by sending messages.

In the Charity Finder project you created an app to help you locate a charity worthy of your contributions.

A currency converter is used to convert an amount in one currency to its corresponding value in another currency using their current exchange rate…

CSS variables are a powerful tool that lets the developer associate a symbolic name with a value, and then use that name in the stylesheet wherever…

Fast Food simulates the operation of a simple take-away restaurant and is designed to help the developer put his or her knowledge of Promises and…

An app where users can create polls where voters can suggest any games available on IGDB to play on a stream or a gaming get-together.

GitHub Timeline combines the two to create a visual history of a users GitHub activity.

Carnivals and circuses have featured the HighStriker sideshow game since at least the 1930's.

In this challenge, you'd create a javascript validation script to validate the inputs entered by a user using RegEx.

Convert Github flavored markdown into HTML code.

Allow users to generate custom memes by adding text over an image.

The My Podcast Library app merges your newfound knowledge of web scraping with your frontend skills to extend the simple Podcast Directory app into…

Create and store your notes for later purpose!

The Podcast Directory continues this process and introduces you to another web scraping package - Puppeteer.

As a developer you can create a quiz application for testing coding skills of other developers.

In Sales Reciepts you'll take this a step further by creating an app that records point of sales receipts, presumably for subsequent balancing…

The goal of the Simple Online Store is to give your users the capability of selecting a product to purchase, viewing purchase information, adding it…

Whether your main sport is soccer, baseball, cricket, or competitive Esports following the progress of your favorite team during tournaments is an…

The Survey app gives you the opportunity to learn by developing a full-featured app that will you can add to your toolbox.

The classic To-Do application where a user can write down all the things he wants to accomplish.

Understanding how an app can be compromised is the first step in coming up with effective protection measures.

The objective of the Word Frequency app is count the frequency of words in a block of text and create a tabular display of each unique word in the…

Short links you own, with a chart of who clicked what and when.

Collect anonymous questions and answer the ones that rise to the top.

Play a track and let the frequencies drive what you see.

Pick a slot across timezones without anyone getting the wrong hour.

A shape that expands and contracts, and you follow it.

The full path from cart to confirmation, including everything that can go wrong.

Type an unbalanced reaction and watch the coefficients solve themselves.

Grab a corner and watch the fabric fall and swing.

The triangle chart that shows whether anyone actually sticks around.

Paste a palette and find out which pairings actually pass.

Grab any colour on screen and keep a palette as you browse.

Cmd-K, type three letters, and you're where you wanted to be.

Drive, train or bike — compare the real cost, time and carbon.

Set a date, time and place, and see the sky exactly as it looks.

Build a multi-stop gradient by dragging stops, then copy the CSS.

Two months side by side, hover to preview the range, presets on the left.

Paste selectors and find out which one actually wins.

Just text, a word count, and no way to lose your work.

Design a signature, copy it, and have it survive Outlook.

Clues in one panel unlock the next, until the door opens.

Drag files in, watch them upload, retry the ones that fail.

A pomodoro timer that keeps running when you switch tabs.

Fills any form with realistic junk, including the awkward cases.

Where people drop out, and how much each step is costing you.

Here's a place — point at where you think it is on the map.

Finds the forty dead branches you forgot about and clears them safely.

Log who paid for what and get the fewest transfers that settle it.

Build a request, send it, and keep the history of everything you tried.

Drop images in, tune the quality, watch the file size drop.

A page for a game that doesn't exist yet, built to make strangers wishlist it in ten seconds.

Stock levels, reorder points, and a warning before you run out.

Place blocks on an isometric grid and build a little room.

Paste a token and see exactly what it claims and when it dies.

The numbers that matter, each with its trend and its target.

A tailing log window that stays smooth at ten thousand lines.

Tap along to the song and it timestamps every line.

A running total of what this meeting is costing, in real time.

Flip two cards, hope they match, and don't let the animation lie to you.

A daily check-in that turns into a year you can look back on.

A long form broken into steps that never loses your answers.

A setup flow that remembers where you stopped and nudges you onward.

Tab to indent, drag to reorder, collapse anything.

Not a rule checklist — an actual estimate of how long it would take to crack.

Structured data in, a PDF that fits on one page out.

It tells you which plant needs water today, and only today.

Subscribe to feeds, and it remembers exactly where you stopped.

Chart what you paid over time and spot when it quietly went up.

Generate a code, style it, and check it still scans.

Tells you how long an article really takes, before you commit.

Pulls receipts out of your inbox and files them into a spreadsheet.

Change the serving count and every quantity rewrites itself sensibly.

Type a pattern and watch it highlight matches as you go.

Drag the divider, and the layout remembers where you left it.

Bold, links, lists — and a toolbar that knows what's under the caret.

Record a tab, trim the ends, download the file.

A public status page that goes red the moment something stops responding.

Measures your site every night and shouts when it gets slower.

A page built for the sixty seconds before a limited release sells out.

A 16-step grid that actually keeps time.

Income flows in on the left and fans out into where it actually went.

Faceted search where every filter shows how many results it would leave.

Generate a puzzle with exactly one solution, then help me find it.

Sweeps up the ninety tabs you'll never read and files them somewhere findable.

Type 'take lamp' and have it actually understand.

Nested replies that stay readable eight levels down.

Stack cities vertically and find the hour nobody has to wake up for.

Spotlight an element, explain it, move to the next.

Tune the light timings and watch the queue clear or grow.

Everyone on their phone, and the first buzz wins.

Type a phrase and let the layout engine set it beautifully.

A spreadsheet-grade model with real controls instead of hidden formulas.

Pick a style, pick your screen size, download something you'd actually use.

A ring that fills as you drink, and resets at midnight.

Log sets fast, and see whether you're actually getting stronger.