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Elysia vs Fastify

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Elysia vs Fastify
Fact	Elysia	Fastify
Language	TypeScript	JavaScript
Licence	MIT	MIT
Stars	19k	37k
Latest	1.4.30	v5.12.5
Last push	2026-10-05	2026-10-06
Release cadence	about 43 days between releases	about 6 days between releases
Active contributors	2 commit authors on the default branch in the last 90 days	34 commit authors on the default branch in the last 90 days
Flags	none	none

How they relate

Both replace Express. Alternatives to Express →
Full replacementElysiaBuilt for Bun, with end-to-end types between server and client.
Full replacementFastifySchema-based validation and serialisation, and a plugin system.