• It accepts a set of manual entries of weight measurements taken at different dates
• It can plot a graph
• It can allow to track multiple entities, for example more than one person weight
• Store them somewhere

A calculator app

A standard calculator: numbers, +, -, *, /, and the result

See video tutorial

A book database

• Enter the books you own
• Enter the books you’d like to buy
• Store the book info, images

A recipes app

• Enter a name, a description with the steps
• Have pictures
• Have some ranking for difficulty and quality
• Add the time needed
• Have different steps with a picture for each
• Store them somewhere

See video tutorial

A bill tracker

• Log bills, amounts and date
• List bills
• Have a few graphs (this year / last year)
• Store them somewhere

An expenses tracker

• Log expenses, tag them (or have categories)
• List expenses
• Have a few graphs (last month / last year)
• Store them somewhere

A chat application

• Some sort of stripped-down Slack
• People enter without authentication and are assigned a name, stored for when they come back
• Store the history
• Add notifications

A notes app

• Add a new note
• List all your notes in the sidebar
• Store them somewhere

A personal diary app

• Add entries with a date and text
• Entries have a date
• Show more recent first
• Attach pictures
• Store them somewhere

A pomodoro app

• Enter a time
• Start timer
• Alert when the time is over

See video tutorial

A meme generator

• Have 10 popular meme images
• Let the user add the text
• Result is image + text
• Store the history

Tic-tac-toe game

See video tutorial

The game of life

A great project involving math and graphics.

See video tutorial

A blog engine

• Allow to login and add posts
• Visitors can add comments
• Store the data somewhere

A QA engine

• Allow to login
• Allow to add questions
• Allow to answer to questions
• Allow original user to choose the best question
• Store the data somewhere

A forum engine

• Allow to login
• Allow to add posts
• Allow to comment on posts
• Store the data somewhere

An embeddable live chat

Think Intercom or Olark.

• Have a “backend” where you respond
• Embed on a web page
• Let people write to you privately

API-powered apps

A Hacker News client

• List the popular posts
• Show a post comments
• Show a user profile
• Search HN

Check HNPWA and Awesome Hacker News for inspiration

A Reddit client

• List the popular posts
• List the comments of a post
• Show a user profile

An Instagram client

• Enter an hashtag and get the latest posts
• Enter a username and get the latest posts
• Allow to store one or more hashtags/usernames and get all the latest posts from those

A GitHub API client

• List the popular repositories from today / week / month
• List the latest commits in a repository
• Show a person or organization public repositories ranked by stars

An Unsplash API client

• Search images by topic
• Let the user enter a term, show relevant images

Start at Unsplash API

Data for your sample apps

Sometimes you start doing some simple app, but you’re bored at finding data you can use. You don’t have to, you can use real data, or random data.

Public APIs you can use in example projects

Maybe you have an idea for a perfectly nice CRUD app, or something that works with an API, but you don’t want to create the API in the first place.

I recommend to check out Airtable, which provides a great API for developers, very easy to use, like a database.

There are amazing public APIs you can use:

• The Cat API
• The Dog API
• The Chuck Norris API
• Fuck Off As A Service API
• Quotes API
• Quotes API
• The Spotify API
• The New York Times API
• The Wikipedia API
• The Wikidata API
• The Medium API
• Design Quotes API
• The GoodReads API
• The Dribbble API
• The 500px API
• The Unsplash API
• The Giphy API - GIFs!
• The Pixabay API
• Exchange rates
• Site screenshots API
• The Oxford Dictionary API
• Website Technologies API
• The Mapbox API
• Music Lyrics API by Genius
• Site meta tags API
• The EventBrite API
• Open source projects changelogs
• The GitHub REST API
• The GitHub GraphQL API
• QR codes API
• The StackExchange API
• Words and synonyms
• The Nasa API
• The SpaceX API
• The Hacker News API
• The Instagram API
• The Reddit API
• The Slack API
• The Twitter API
• The YouTube API
• Worldwide Holidays API

Image placeholders for your sample projects

• Placeholder.com
• Placekitten

Image generators

Avatars:

• RoboHash
• Adorable Avatars
• DiceBear Avatars (pixel art)

Sample text generator for your sample projects

Lorem Ipsum is boring. Spice it up:

• Cat Ipsum
• Bacon Ipsum
• Cupcake Ipsum
• Hipster Ipsum
• Office Ipsum
• Samuel L. Ipsum
• Zombie Ipsum
• Doctor Ipsum
• SF Ipsum

If you insist on using Lorem Ipsum, Loripsum is a good generator.

Other fake data

FakeJSON has tons of fake data generation capabilities.

JSONPlaceholder has fake posts, comments, photos, todos, users, albums ready for REST consumption.

Need fake name/user data generation? Check UI Names and RandomUser

Wrapping up

I hope this list is comprehensive enough to suit your needs!

Have fun and keep coding!