lint vs Replit Agent

lint and Replit Agent differ in what they actually do, not just how well. lint is a rule engine: you declare what your design system allows — which components exist, which variants they have, which theme tokens they may touch — and violations come back as instructions naming the fix, drawn from your own components, variants and theme. Its rules are contract-based: shadcn/no-restyle takes per-component contracts with pattern, allow and deny lists so a CardTitle can change typography while CardContent changes spacing, and shadcn/no-arbitrary-values keeps classes on your theme's spacing scale. It ships as both an ESLint and an Oxlint integration and works on Tailwind v4 without rewriting your design system; shadcn/ui isn't required. Replit Agent is a generator and host: you prompt in plain English, it writes code, runs it in an integrated terminal, lets you debug and redeploy in-tab, and publishes to a live Replit URL. Custom Instructions and reusable Skills lock conventions across sessions; Package Firewall blocks malicious dependencies before they land. As of July 2026 it also searches Slack messages, files and channels — including private conversations — sends messages, and creates or updates canvases, plus a mobile app with voice input and Live Activities. One produces constraints; the other produces apps.

lint is free and open source — pricing_type is simply 'free'. There is no hosted tier, no dashboard, no CI product; it is a repo-level linter you install, and its setup path is an agent-oriented prompt that reads SETUP.md and installs @shadcn/lint. Cost is effectively zero beyond the engineering time to declare your design-system rules. Replit Agent is freemium: you can start without paying, but the surrounding Replit Cloud services — deployment, storage, data transfer — are what you eventually pay for once a project is published. The relevant freshness signal: on 2026-07-24 Replit announced lower prices across Replit Cloud for deployment, storage and data transfer starting August 1, 2026, and those reductions apply automatically to projects that are already published, so existing bills shrink without migration. That is a meaningfully different spend profile from lint's zero. If budget is the deciding axis, lint is free forever and Replit Agent is free-to-start with usage-based cloud costs that just got cheaper. The two line items never appear in the same budget conversation, which is itself a sign these products aren't substitutes.