Engineering | Replit

Replit — Replit Blog – Product updates from the team Introducing Replit Agent 4: Built for Creativity Wed, Mar 11, 2026 • FeaturedIntroducing Agent 4—Replit's fastest, most versatile Agent yet. Push the boundaries of what's possible in vibe coding and build production-ready apps faster. Closing the loop: Evaluating and improving Replit Agent at scale We Built a Video Rendering Engine by Lying to the Browser About What Time It Is Decision-Time Guidance: Keeping Replit Agent Reliable How Replit Secures AI-Generated Code white paper Inside Replit’s Snapshot Engine: The Tech Making AI Agents Safe Enabling Agent 3 to Self-Test at Scale with REPL-Based Verification Building Production-ready Apps with Automated Database Migrations on Replit Using Tvix Store to Reduce Nix Storage Costs by 90% Introducing Workflows Replit's All-new Database Editor So you suspect you have a memory leak... Shell2: 200× faster, persisted, multiplayer-native Shells How Replit makes sense of code at scale Improved Dependency Management Advanced port configuration - Tue, Jun 23, 2026Most Replit Agent users start with an idea. They describe the goal in natural language — without a repo, test suite, or chosen framework — and expect the agent to turn it into a functioning app. The result might be a website, slide deck, mobile app, several connected artifacts, or something else entirely. Vibe coders are not usually checking diffs or test output. Success for Replit Agent is deceptively simple: the app should work when users click around. That changes the job of evaluation. A single score can help with a specific shipping decision, but it cannot tell us, week over week, whether Replit Agent is getting better for users. To answer that question, evaluation must become part of the improvement loop. Evaluation has to do more now - Thu, Feb 26, 2026How Replit turns any web page into a deterministic video by virtualizing time itself, patching