Inside Replit’s Snapshot Engine: The Tech Making AI Agents Safe
An agent needs room to experiment and a way back when it gets things wrong. Inside the filesystem snapshots and database forks that make that possible.
Engineering Blog
Technical insights from the people building Replit.
Enabling Agent 3 to Self-Test at Scale with REPL-Based Verification
An app can look finished and still fail when you click it. How Agent 3 combines code execution and browser testing to check its own work.
Building Production-ready Apps with Automated Database Migrations on Replit
Learn how Replit automated database migrations between dev and production environments, enabling safe AI agent development with minimal user intervention.
Using Tvix Store to Reduce Nix Storage Costs by 90%
Our Nix package disk had grown to 20 TB. How Tvix Store cut storage costs by 90% without dropping the packages older projects depend on.
Introducing Workflows
Stop retyping the same shell commands. Turn your development routine into reusable tasks, then run them together with Replit Workflows.
Replit's All-new Database Editor
See and edit your app’s Postgres data in a familiar table view. A look at Replit’s database editor, with no SQL required to get started.
So you suspect you have a memory leak...
Garbage collection doesn’t prevent every memory leak. How to confirm a leak, inspect a running program’s heap, and track down what won’t let go.
Shell2: 200× faster, persisted, multiplayer-native Shells
A shell that keeps its history and works with other people. How we rebuilt Replit’s terminal for speed, persistence, and multiplayer sessions.
How Replit makes sense of code at scale
What are people building with Replit? How we analyze anonymized public code and organize it into a taxonomy, without reviewing private projects.
Improved Dependency Management
Languages, packages, and system libraries now share one place in the workspace. How the Dependencies pane helps you configure projects with more than one language.
Advanced port configuration
Run multiple services without guessing which port goes where. Explicit mappings, localhost previews, and a Networking tool make the connections easier to follow.
Searching Nixpkgs in Under 30 Milliseconds
Finding a Nix package shouldn’t keep you waiting. How rippkgs indexes Nix expressions and returns search results in under 30 milliseconds.
Replit + pip
Prefer requirements.txt to Poetry? Replit now supports pip directly, with a short migration path for existing Python projects.
Easier Editing for .replit Files
Configure your project without hunting through docs. Code completion and inline help bring the .replit file’s options into the editor.
Landscape or Portrait? You Decide
Code upright on your phone or turn your tablet sideways for more room. Here’s how we made Replit adapt to both.
Dec 12 Incident Update: Secrets and repl.co Static Hosting Unavailable
How a storage configuration change disrupted Secrets and legacy static hosting in December 2023, and what we changed after the recovery.
GitHub x Replit Workflows: Enhancing Developer Productivity
Find the right repository, bring it into Replit, and get to work. What changed in GitHub imports, authentication, and the Git pane.
Skip the README, let us install for you
Python packages often need libraries that pip can’t provide. Replit detects those missing system dependencies and installs them for hundreds of packages.
New and Improved Console
Past runs shouldn’t vanish when you need them. A tour of the rebuilt Console, its saved execution history, and the choices behind the interface.
System Dependencies on Replit
Search for native tools and libraries without writing Nix configuration by hand. A guide to adding and managing system dependencies in the workspace.
Tabs and Spaces - Smarter Indentation
Keep pasted code aligned and let the editor pick up a file’s indentation style. Small changes that take the fuss out of tabs and spaces.
Sep 29 Incident Update: Read-Only Repls
An incomplete storage build left some projects read-only on September 29, 2023. Our account of the incident, recovery work, and safeguards that followed.
Changes to Hosting on Replit
Why we’re moving legacy hosting to Deployments, what that means for existing apps, and why the free development experience isn’t going away.
Upgrading Analytics for Deployments
See how people use your deployed app without leaving the workspace. A tour of the analytics tab and the traffic data it puts at hand.
Packages: Powered Up
Install packages with fewer clicks, see what’s already in your project, and get clearer errors when something goes wrong.
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