Science Apr 15, 2026

The Marvels of Science: Unraveling the Mysteries of Our Universe

Exploring the Fascinating World of Science body { font-family: Arial, sans-serif; line-height: 1.6; margin: 20px;...

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DEV Community · Apr 18, 2026

Building Apps That Act on Behalf of OSC Users (OAuth + PKCE in 50 Lines)

Most cloud platforms lock you into a single-tenant model. Your app gets one set of credentials. Every user's data, every provisioned resource, every database lives inside your workspace. You pay for it, you own it, and you carry the blast radius when something goes wrong. Open Source Cloud (OSC) wo...

$60K Billed in 13 Hours: Why Leaked Firebase Keys Keep Killing AI-Built Apps

A Japanese dev just got billed roughly $60,000 (~9 million yen) in 13 hours because a Google API key leaked from their Firebase + Gemini app. I saw the post trending on Qiita this morning and my stomach dropped — not because it's a new story, but because I've seen the exact same mistake every single...

DEV Community ayame0328

DEV Community · Apr 18, 2026

Curing App Fatigue: How I Built a Unified AI Inbox

Curing App Fatigue: How I Built a Unified AI Workspace Constantly jumping between Gmail, Slack, and Teams to keep up with work kills focus. I built CortexSage to fix this fragmentation, creating one quiet place where you can handle all your communication without the tab switching headach...

DEV Community cortexsage

DEV Community · Apr 18, 2026

Multi-site schemas: lessons from evolving one large system over time

Multi-site schemas: lessons from evolving one large system over time I worked on a large multi-site system where the data model had to evolve as the product grew. It started out simple, but as always, with progress the demand also grew to something that allowed flexibility. The progress...

DEV Community Istvan Szabo

DEV Community · Apr 18, 2026

I Built a Voice-Controlled AI Agent That Runs Entirely on Your Machine

No cloud. No API keys. Just your voice, a local LLM, and a clean pipeline that actually works. The Idea Most AI assistants are cloud-dependent. You say something, it goes to a server somewhere, gets processed, and comes back. That works fine — until you care about privacy, l...

DEV Community Manish Reddy

DEV Community · Apr 18, 2026

EcoMark - Discover your environmental footprint

This is a submission for Weekend Challenge: Earth Day Edition EcoMark – A Simple Way to Reflect on Our Carbon Footprint What I Built For this challenge, I built EcoMark, a lightweight web app that helps people quickly understand their everyday environmental impact. The idea w...

DEV Community Mitchel Techie

DEV Community · Apr 18, 2026

I Built “Sousa” — a Detective-Style Investigation Board App

You know that board from crime dramas? I made it into an app. You’ve probably seen it in crime dramas and movies — a whiteboard covered with suspect photos, evidence, and strings connecting everything together. I turned that idea into an app. It’s a digital investigation board where you...

DEV Community Apu & Opu

DEV Community · Apr 18, 2026

I Measured the Carbon Footprint of My AI Agents. 87% Was Pure Waste.

This is a submission for Weekend Challenge: Earth Day Edition Every token your agent burns is a small amount of coal somewhere in a datacenter. I got curious about the math and then horrified by the answer. I already maintain ContextClaw, a context-management plugin for OpenClaw that classifies ev...

DEV Community signalscout