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Awesome Building Blocks for Web Apps – Massive Collection of Resources

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Curated list of standalone features to be integrated into web applications: Get full features built by others instead of having to write everything yourself.

If you like these building blocks, check out, a marketplace where developers can search, compare and integrate web application building blocks.


UI Elements

  • Tailwind UI – UI components, by the creators of Tailwind CSS.
  • Webix – JavaScript UI library and framework for displaying data in different ways.
  • Highcharts – Interactive charts for web.
  • Webatoms – JavaScript bridge for Xamarin.Forms.
  • Creative Tim – Themes for React, Angular, Vue, Lavarel and HTML5.
  • Syncfusion – Data visualization components and PDF Viewer.
  • CoreUI – Vue admin template.
  • UIfort – UI design systems for all major frontend frameworks.
  • Semantic UI – Open source UI component library for React, Meteor, Ember and Angular.
  • Design Revision’s Shards Pro – Design blocks for web or mobile apps.
  • Themesberg – Bootstrap templates, themes and UI kits.
  • Treact – React templates for landing pages, built on Tailwind CSS.
  • Creative Designs Guru – Themes for React, Nextjs and Eleventy, built with Tailwind CSS.

Exit Intent Popup

  • Wisepops – Contextual popups, banners and bars for mobile and desktop visitors.
  • Listagram – Interactive opt-in form for collecting email addresses.
  • Poptin – Popups and forms that can be integrated anywhere in the website.


  • Auth0 – Authentication management with native support for Angular, React and VueJS.
  • Firebase – PaaS from Google, including authentication management.
  • Okta – Authentication and Authorization solution with support for Angular, React and VueJS.
  • Onelogin – Authentication focussed on company internal applications.
  • Microsoft Azure Active Directory – Authentication management in Azure, based on Microsoft accounts.
  • AWS Cognito – AWS authentication management. Frontend integration is part of AWS Amplify.


  • Calendly – Stand-alone booking solution.
  • Zoho Bookings – Online scheduler integrated into Zoho Suite.
  • Acuity Scheduling – Appointment scheduling with extensive API.
  • 10to8 – Booking tool with many features in the free tier.
  • SuperSaaS – Appointment scheduling with focus on group scheduling.
  • SimplyBook.Me – Booking tool with its own booking directory.
  • OnceHub – Scheduling via ScheduleOnce and meeting management via InviteOnce.
  • YouCanBookMe – Online scheduling for teams.
  • OnSched – Scheduling API for marketplaces & applications.
  • AppointmentPlus – Appointment scheduling with coupons.
  • Booxi – Booking and online directory components.


  • OneSignal – Mobile and web notifications.
  • Notific – Notifications including a PHP SDK.
  • WonderPush – Notifications focused on speed.
  • VWO Engage – Notifications as part of a larger marketing suite.
  • Signalize – Free notifications with paid analytics add on.


Chat Bot



  • Sentry – Full-stack error monitoring with release management included.
  • Raygun Crash Reporting – Error monitoring as part of the Raygun suite.
  • Honeybadger – Error, uptime and check-in monitoring.
  • Rollbar – Error monitoring with the ability to replay HTTP requests that caused errors.

Content Management

  • Contentful – Headless content management system.

Consent Management

  • Cookiefirst – Cookie consent manager.
  • usercentrics – Compliance manager that can be implemented as part of existing pages.
  • Sourcepoint – Compliance management as part of a suite including also ad blocker recovery.
  • PiwikPro – Compliance management as part of an analytics tool.
  • Consent Management Provider – German management tool for Cookie Consent.
  • UniConsent – Consent management platform for GDPR, CCPA, COPPA compliance.
  • TrustArc – Privacy management for the CCPA, GDPR, LGPD and 900+ other global regulations.
  • Cookiebot – Cookie tracking manager.
  • iubenda – Consent management and terms and conditions generator.
  • Civic Cookie Control – Smaller Cookie and GDPR compliance product.
  • CCM19 – German cookie consent manager.
  • CookieInformation – Focus on compliance reporting via a dashboard.
  • CookiePro – Cookie management as part of a privacy management solution.
  • React Cookie Consent – A small and customizable cookie consent bar for React applications.
  • React Cookie Banner – React cookie banner which can be automatically dismissed with a scroll.


  • Mux – Stream hosted and live videos.
  • Spotify web playback SDK – Client-side JavaScript library which allows you to create a new player in Spotify Connect and play any audio track from Spotify in the browser via encrypted media extensions.


  • Static Forms – Form that sends its results to your email.
  • FlyingForms – Building, versioning and managing forms.


  • TrustPulse – Shows recent buyers on your website.



  • Vonage – Voice, messaging, video and data capabilities across unified communications, contact centers and communications APIs.

Social Media

  • AddThis – Social sharing buttons, available on AMPs.
  • ShareThis – Social sharing buttons.
  • AddToAny – Sharing buttons for many different target services.


  • Algolia – Search for your application.
  • Search UI – UI integration for ElastiSearch.

Feature flags

  • Optimizely’s Rollouts – Feature flags combined with A/B testing.
  • LaunchDarkly – Feature management with multiple integrations in CI servers and ticketing systems.
  • Split – Another feature management with multiple integrations in CI servers and ticketing systems.
  • Rollout – Feature management focusing on segmented roll-out of features.


  • JustReview – Collect reviews from e-commerce, social media and review service providers and embed on a website.
  • ReviewsOnMyWebsite – Collect, monitor and display customer reviews.

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