Software Alternatives, Accelerators & Startups

Svelte VS Fastify

Compare Svelte VS Fastify and see what are their differences

Svelte logo Svelte

Cybernetically enhanced web apps

Fastify logo Fastify

Fastify is a low overhead web framework, for Node.js.
  • Svelte Landing page
    Landing page //
    2023-07-27

We recommend LibHunt Svelte for discovery and comparisons of trending Svelte projects.

  • Fastify Landing page
    Landing page //
    2023-10-03

Svelte features and specs

  • Performance
    Svelte shifts much of the work from runtime to compile time, resulting in faster and more efficient web applications. By compiling components to highly optimized vanilla JavaScript, it reduces the overhead and boosts performance.
  • File Size
    Due to its compile-time nature, Svelte produces smaller bundle sizes compared to other frontend frameworks like React or Angular, which can significantly improve load times and performance.
  • Simplicity
    The framework is designed to be more accessible and easier to understand. Svelte’s syntax is clean and straightforward, allowing developers to get up and running quickly with minimal boilerplate.
  • Reactivity
    Svelte provides a simple and intuitive way to handle reactivity by using built-in language constructs like assignments. This means no complicated state management libraries are necessary for many use cases.
  • Less Boilerplate
    Svelte reduces the boilerplate code typically required in other frameworks, resulting in a cleaner and more maintainable codebase. This can help accelerate development and reduce bugs.
  • Reactive Programming
    SvelteKit leverages Svelte's reactive programming model, allowing developers to write less code while achieving better functionality through automatic reactivity.
  • Integrated Router
    SvelteKit includes a built-in router, which simplifies the creation of multi-page applications and enables easy setup of dynamic routes.
  • SSR and SSG
    SvelteKit supports Server-Side Rendering (SSR) and Static Site Generation (SSG) out of the box, giving developers flexibility in how they build and deploy their applications.
  • Opinionated but Flexible
    While SvelteKit provides an opinionated setup to streamline the development process, it also allows for customization to fit a developer’s specific needs.

Possible disadvantages of Svelte

  • Ecosystem Maturity
    Svelte’s ecosystem is not as mature or extensive as React’s or Angular’s. There are fewer third-party libraries, tools, and resources available, which might make it more challenging to find solutions for less common problems.
  • Learning Curve
    While Svelte itself is simpler, its approach is quite different from traditional frameworks like React and Angular. This can require a mental shift and time to learn new paradigms, especially for developers coming from those backgrounds.
  • Community Support
    Given that Svelte has a smaller user base and community compared to more established frameworks, finding community support, tutorials, and best practices can sometimes be more difficult.
  • Tooling
    While Svelte has good official tooling and support, it may lack some of the advanced tools and integrations available for other frameworks, which can slow down development for more complex applications.
  • SEO and SSR
    Although Svelte has options for server-side rendering (SSR) and improving SEO, handling these aspects is not as out-of-the-box or mature compared to frameworks like Next.js for React.
  • Community Size
    SvelteKit has a smaller community compared to other frameworks, which can affect the availability of online resources, tutorials, and community-driven support.
  • Tooling and Integration
    Some commonly used development tools and integrations may not be fully compatible with SvelteKit, necessitating workarounds or additional configuration.
  • Frequent Updates
    As a newer framework, SvelteKit undergoes frequent updates and changes, which can sometimes lead to breaking changes or require developers to frequently update their knowledge and projects.
  • Market Adoption
    SvelteKit is less adopted in the industry compared to other frameworks, which might make it a less attractive option for companies looking for widely recognized and vetted solutions.

Fastify features and specs

  • Performance
    Fastify is known for its high performance, being capable of handling a large number of requests per second while maintaining low overhead, thanks to its efficient architecture.
  • Schema-based Validation
    Fastify employs JSON schema for validation and serialization, which ensures data integrity and reduces the boilerplate code required for validation.
  • Extensibility
    It offers a robust plugin architecture that allows developers to easily extend or modify functionalities, enhancing modularity and scalability.
  • Developer Experience
    Fastify provides a pleasant developer experience with excellent documentation, a simple API, and integrated TypeScript support, which helps in code maintainability and faster development.
  • Asynchronous Support
    Built on top of Node.js, Fastify fully supports asynchronous programming, making it simple to handle asynchronous tasks such as I/O operations.

Possible disadvantages of Fastify

  • Community Size
    While growing, Fastify's community is smaller compared to more established frameworks like Express, which may result in fewer third-party plugins or community support.
  • Learning Curve
    For developers familiar with other Node.js frameworks, Fastify's concepts and differences might present a learning curve, especially its use of schemas and its plugin architecture.
  • Overhead for Simple Applications
    For very simple APIs or applications that don't demand high performance, the additional features Fastify offers may be unnecessary and can add complexity.
  • Maturity of Ecosystem
    Despite its growing popularity, Fastify’s ecosystem and range of plugins might not yet cover all use cases, requiring developers to build custom solutions.

Svelte videos

SvelteKit Breaking Changes 2022 - My Reactions and What You Need to Know!

More videos:

  • Review - Svelte vs React vs Angular vs Vue
  • Tutorial - SvelteKit Crash Course Tutorial #1 - What is SvelteKit?
  • Review - Why Svelte is the best JS "framework"
  • Review - Oh crap, here comes *another* JavaScript framework || SVELTE || Sveltejs

Fastify videos

Master Fastify Tutorial

More videos:

  • Review - Fastify v3
  • Review - FASTIFY.CC BIG SCAM UPDATES || FASTIFY.CC LEGIT/SCAM LIVE PROOF CryptoTricks-Find New Site

Category Popularity

0-100% (relative to Svelte and Fastify)
Javascript UI Libraries
100 100%
0% 0
Web Frameworks
0 0%
100% 100
JavaScript Framework
88 88%
12% 12
Developer Tools
86 86%
14% 14

User comments

Share your experience with using Svelte and Fastify. For example, how are they different and which one is better?
Log in or Post with

Reviews

These are some of the external sources and on-site user reviews we've used to compare Svelte and Fastify

Svelte Reviews

Top JavaScript Frameworks in 2025
SvelteJS is a modern JavaScript framework that is useful for building static web apps that are fast, lean, and fun. You can use Svelte to build single, reusable components and large or even small-scale projects. Svelte has started gaining attention because of its ability to produce smaller code bundles that run faster in web browsers.
Source: solguruz.com
Top 10 Next.js Alternatives You Can Try
This web development framework can help you perform the easiest tasks to develop the interface components that users can interact with within their browsers, such as the comment section. Moreover, it has SvelteKit to render the components of the entire page with best practices and developments. You can utilize this platform effortlessly to add basic functionalities and...
20 Next.js Alternatives Worth Considering
Cruise into the Svelte ecosystem with Sapper, a framework that takes all the brilliance of Svelte and dials it up for app building. It’s like Svelte’s outgoing cousin, optimizing for an even smoother ride from development to go-live.
10 Best Next.js Alternatives to Consider Today
SvelteKit, the official framework for Svelte, streamlines the development of Svelte applications. With an intuitive API, SvelteKit simplifies the creation of server-side rendered (SSR) and statically generated (SSG) applications while retaining the reactive nature that makes Svelte unique. If you're seeking a framework that marries simplicity with powerful capabilities,...
The 20 Best Laravel Alternatives for Web Development
The next of these Laravel alternatives is Svelte. It cuts through the complexity, snipping off any excess, pre-compiling its magic to keep your app lightweight without shedding any muscle. The end result? Lightning strikes in web performance.

Fastify Reviews

Forget Express.js — opt for these alternatives instead
This also means that we can rely on Fastify to respond with a sane error when parsing fails. For example, when the client sends invalid JSON to Fastify, the response will look something like this:

Social recommendations and mentions

Based on our record, Svelte seems to be a lot more popular than Fastify. While we know about 386 links to Svelte, we've tracked only 32 mentions of Fastify. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Svelte mentions (386)

  • SVQK - A Web Application Development Platform Using Svelte + Quarkus
    At Project Au Lait, we are developing and publishing an open-source asset called SVQK, which combines Svelte (Frontend) and Quarkus (Backend) for web application development. The asset includes automated testing tools and source code generation tools. This article introduces an overview of SVQK. (For instructions on how to use SVQK, refer to the Quick Start.). - Source: dev.to / 11 days ago
  • Why Svelte Might Be the Best Framework You Haven't Tried Yet 🚀
    Embrace the Ecosystem: Explore tools like SvelteKit for full-fledged app development. - Source: dev.to / 2 months ago
  • Firebase: deploy a React application with Firebase Hosting
    Vite is a modern build tool created by Evan You, the same developer behind Vue.js. It is designed to provide a faster and leaner development experience for modern web projects. You can use Vite to create front-end projects in seconds: React, Svelte, Lit, Qwik and many others modern frameworks are supported. - Source: dev.to / 3 months ago
  • Lexical 0.24 with Vanilla JS: Getting started
    Lexical is an open source project and considered the successor of Draft.js. It is primarily developed by Meta, licensed under MIT. It is not restricted to React, but supports Vanilla JS, too. The flexibility enables us to integrate it with other JS libraries such as Svelte and Vue. - Source: dev.to / 3 months ago
  • Svelte 5 on Bun 1.2: Getting started
    ┌ Welcome to the Svelte CLI! (v0.6.20) │ ◇ Which template would you like? │ SvelteKit minimal │ ◇ Add type checking with Typescript? │ Yes, using Typescript syntax │ ◆ Project created │ ◇ What would you like to add to your project? (use arrow keys / space bar) │ prettier, eslint │ ◆ Successfully setup add-ons │ ◇ Which package manager do you want to install dependencies with? │ bun │ ◆ Successfully... - Source: dev.to / 3 months ago
View more

Fastify mentions (32)

View more

What are some alternatives?

When comparing Svelte and Fastify, you can also consider the following products

React - A JavaScript library for building user interfaces

ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple

Vue.js - Reactive Components for Modern Web Interfaces

Nest.js - A progressive Node.js framework for building efficient, reliable and scalable server-side applications.

Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.

Adonis JS - AdonisJs is a Node.js web framework with breath of fresh air and drizzle of elegant syntax on top of it