Learn to build software products, put them on the internet, find customers, and create an independent business that can make a great living.https://flaviocopes.com/https://flaviocopes.com/linux-server-commands/https://flaviocopes.com/linux-server-commands/The Linux commands that mattered when my Ubuntu servers broke in 2026: df, du, journalctl, free, ss, ufw, fail2ban, apt, with real output and what I did next.Thu, 24 Sep 2026 07:00:00 GMThttps://flaviocopes.com/pi/https://flaviocopes.com/pi/Pi is a minimal open source coding agent for the terminal. Install it, pick a model, extend it with TypeScript, and compare it with Claude Code and Codex.Wed, 23 Sep 2026 13:00:00 GMThttps://flaviocopes.com/cloudflare-quick-tunnels/https://flaviocopes.com/cloudflare-quick-tunnels/Put localhost on the internet with one cloudflared command. How quick tunnels work, what your app sees, webhooks, dev servers, local LLMs, scripts, limits and gotchas.Wed, 23 Sep 2026 10:00:00 GMThttps://flaviocopes.com/cloudflare-tunnel/https://flaviocopes.com/cloudflare-tunnel/Run a site or app from a home machine on your own domain with no open ports: named tunnels, the dashboard and CLI paths, ingress rules, running as a service, Access login, SSH, limits.Wed, 23 Sep 2026 10:00:00 GMThttps://flaviocopes.com/hosting-free-tiers/https://flaviocopes.com/hosting-free-tiers/Hosting free tiers compared: Cloudflare, Vercel, Netlify, Render, Railway, Fly.io, Heroku, AWS, Google Cloud, Azure and VPS hosts, checked September 2026.Wed, 23 Sep 2026 07:00:00 GMThttps://flaviocopes.com/ai-benchmarks/https://flaviocopes.com/ai-benchmarks/How AI companies measure and compare models: benchmarks like CursorBench, SWE-bench and Terminal-Bench, Elo scores, cost per task, and a small eval you can run.Tue, 22 Sep 2026 20:00:00 GMThttps://flaviocopes.com/ssh-apps/https://flaviocopes.com/ssh-apps/Build an app people can ssh into, like the superlogical.jobs board: how SSH apps work, the Go and Node.js stacks behind them, hosting, and more sites to try.Tue, 22 Sep 2026 10:00:00 GMThttps://flaviocopes.com/blog-stack-2026/https://flaviocopes.com/blog-stack-2026/How I run flaviocopes.com in 2026: Astro, Tailwind, Cloudflare Pages, and the small services around a folder of Markdown files.Tue, 22 Sep 2026 07:00:00 GMThttps://flaviocopes.com/fx/https://flaviocopes.com/fx/fx is Vercel Labs' coding agent, a small Zig binary. Run it in the terminal, call it from scripts, or embed the same agent in an app.Mon, 21 Sep 2026 17:00:00 GMThttps://flaviocopes.com/slop-grenades/https://flaviocopes.com/slop-grenades/Slop grenades are AI-generated emails, messages, and pull requests sent without review. The output is fast, but someone else has to check it.Mon, 21 Sep 2026 10:30:00 GMThttps://flaviocopes.com/modern-css-features/https://flaviocopes.com/modern-css-features/Modern CSS features that replace Sass, PostCSS plugins and JavaScript hacks: nesting, :has(), container queries, subgrid and more, checked in September 2026.Mon, 21 Sep 2026 07:00:00 GMThttps://flaviocopes.com/node-builtins/https://flaviocopes.com/node-builtins/Twelve Node.js built-ins that replace axios, nodemon, dotenv, jest, chalk, glob and more, with their stability in Node 24 and one gotcha each.Sun, 20 Sep 2026 07:00:00 GMThttps://flaviocopes.com/browser-apis-replacing-libraries/https://flaviocopes.com/browser-apis-replacing-libraries/Ten browser APIs that replace npm packages and jQuery plugins: dialog, popover, view transitions, structuredClone, groupBy, Temporal, with 2026 support notes.Sat, 19 Sep 2026 10:00:00 GMThttps://flaviocopes.com/grok-bot-vs-cursor-projects/https://flaviocopes.com/grok-bot-vs-cursor-projects/Grok Bot and Cursor Projects both give an agent its own computer and jobs that run without you. Here is how I decide which one gets a task, with examples from my own work.Sat, 19 Sep 2026 07:00:00 GMThttps://flaviocopes.com/sendy-slow-emails-ai/https://flaviocopes.com/sendy-slow-emails-ai/My newsletter took 8 hours to send and the open rate dropped from 24% to 16%. Codex found a Sendy send rate stuck at 20/sec and AWS SNS webhooks blocked by the Cloudflare proxy. Here is the full debugging session.Fri, 18 Sep 2026 13:00:00 GMThttps://flaviocopes.com/updating-plausible-with-ai/https://flaviocopes.com/updating-plausible-with-ai/My self-hosted Plausible instance sat untouched for years on a $6 droplet. Codex upgraded Ubuntu, Docker, PostgreSQL 14 to 16, ClickHouse and Plausible v2 to v3 in ten minutes, then fixed the Nginx websocket config.Fri, 18 Sep 2026 10:00:00 GMThttps://flaviocopes.com/jev/https://flaviocopes.com/jev/Learn how Jev turns text into typed choices, scores, and probabilities, with JavaScript examples, practical patterns, limits, and real use cases.Thu, 17 Sep 2026 21:00:00 GMThttps://flaviocopes.com/scraping-tool/https://flaviocopes.com/scraping-tool/Build a scraping tool with Node.js or Cloudflare Workers: fetch, Cheerio, caching, alerts, browser rendering, and what changes when Google fights back.Thu, 17 Sep 2026 13:00:00 GMThttps://flaviocopes.com/desktop-ai-costs/https://flaviocopes.com/desktop-ai-costs/Protect your AI API keys and margins with server-side authentication, per-user budgets, rate limits, and a global spending cap.Thu, 17 Sep 2026 10:00:00 GMThttps://flaviocopes.com/cap-business-model/https://flaviocopes.com/cap-business-model/Cap gives away the code of its screen recorder under AGPL and still charges for it. A look at the pricing, the license, and what an indie developer can copy.Thu, 17 Sep 2026 07:00:00 GMThttps://flaviocopes.com/membership-site/https://flaviocopes.com/membership-site/Build a paid membership site with Astro SSR, Convex, Resend magic links, Paddle Classic webhooks, and Cloudflare Workers. Step-by-step walkthrough.Wed, 16 Sep 2026 13:00:00 GMThttps://flaviocopes.com/vercel/https://flaviocopes.com/vercel/Learn how to deploy a web app to Vercel, use preview and production deployments, add environment variables, Functions, domains, logs, and rollbacks.Wed, 16 Sep 2026 10:00:00 GMThttps://flaviocopes.com/ide-cli-or-vibe-coding-tool/https://flaviocopes.com/ide-cli-or-vibe-coding-tool/Vibe coding tools, AI-powered IDEs, or CLI coding agents? How to pick the right one for this project, today, based on your experience and what you need.Wed, 16 Sep 2026 07:00:00 GMThttps://flaviocopes.com/securing-a-server-with-ai/https://flaviocopes.com/securing-a-server-with-ai/I asked Codex to audit a freshly migrated Ubuntu server. It enabled the firewall, hardened SSH and Apache, removed installer files, applied 124 security updates and rebooted. Here is what it found and what I learned.Tue, 15 Sep 2026 13:00:00 GMThttps://flaviocopes.com/devops-mistakes-ai/https://flaviocopes.com/devops-mistakes-ai/I resized a DigitalOcean droplet the wrong way and locked myself into a $48/month plan. Codex migrated my Sendy server to a new $12 droplet over SSH, database included, while I changed DNS.Tue, 15 Sep 2026 10:00:00 GMThttps://flaviocopes.com/codex/https://flaviocopes.com/codex/How to use Codex, OpenAI's coding agent: the desktop app from first prompt to review, then the CLI, skills, plugins, worktrees, and scheduled tasks.Tue, 15 Sep 2026 07:45:00 GMThttps://flaviocopes.com/server-process-killed/https://flaviocopes.com/server-process-killed/Claude Code kept dying a few seconds after starting on my Ubuntu server. I pointed Codex CLI at the server over SSH and it found the Linux OOM killer in the kernel logs. Here is the whole session.Tue, 15 Sep 2026 07:00:00 GMThttps://flaviocopes.com/merchant-of-record/https://flaviocopes.com/merchant-of-record/The first payment decision most guides skip: sell through a Merchant of Record like Creem or Paddle, or stay the merchant with Stripe? What each one handles, what it costs, and how to choose.Mon, 14 Sep 2026 09:00:00 GMThttps://flaviocopes.com/where-to-host/https://flaviocopes.com/where-to-host/Compare static hosts, serverless platforms, PaaS options, and VPS providers using current prices, limits, database needs, and operational tradeoffs.Mon, 14 Sep 2026 06:00:00 GMThttps://flaviocopes.com/agentic-ai-lessons/https://flaviocopes.com/agentic-ai-lessons/Six months of building with coding agents every day. Where the bottleneck moved, what I stopped doing, and the habits that survived contact with real projects.Mon, 14 Sep 2026 05:00:00 GMT