# tokio-rs/topcoat

A batteries-included framework for building web apps

Repository: https://github.com/tokio-rs/topcoat
Canonical: https://ross.abutalabs.com/products/topcoat
Language: Rust
License: MIT
License Family: permissive
Last push: 2026-08-26T19:05:32+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 10
- inputs: {"age_days": 152, "days_push": 7, "days_rel": 15, "gap_med": 0, "n_releases_24m": 4}
- flags: young
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4705, forks 167 (observed 2026-08-28T04:08:57.227860+00:00)

## What it is
Topcoat is a modular, batteries-included Rust framework for building full-stack, server-rendered web apps with async components and built-in client reactivity. It compiles reactive expressions to both server rendering and browser JavaScript, eliminating separate API layers and wasm bundles.

## Use cases
- build a full-stack web app in Rust
- server-render HTML without a separate API layer
- add client-side interactivity without writing JavaScript
- build reactive UIs without a wasm bundle or client build step
- query the database directly from async components
- prototype web apps quickly with a batteries-included framework

## When to choose
- you want a single-language Rust stack for server-rendered web apps
- you prefer simplicity and productivity over a sprawling ecosystem
- you want reactive client interactivity without a client build pipeline
- you're comfortable with early-stage software and breaking changes

## When to avoid
- you need a stable, production-hardened framework with long-term API guarantees
- you need a large ecosystem of plugins and community libraries
- you're building a SPA or heavily client-side app
- you need fine-grained control over the client bundle

## Facets
- artifact type: framework
- maturity: experimental
- function: web-framework, ssr, templating, routing, state-management
- domain: web-development, backend, frontend
- platform: rust, cross-platform
- tags: full-stack, server-rendered, reactivity, tokio, no-wasm, batteries-included, web-server

## Member repositories
- tokio-rs/topcoat (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:57.227860+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:19:11.454999+00:00, confidence not recorded.
  - readme: https://github.com/tokio-rs/topcoat (fetched 2026-08-28T04:08:57.227860+00:00, sha 3d96f15b1a1e)
  - registry_crates: https://crates.io/api/v1/crates/topcoat (fetched 2026-08-29T09:03:01.664071+00:00, sha 69f7906a76cd)
- Data as of 2026-08-30T08:39:29.467469+00:00.