A/B Testing UI Variations with Zero Performance Penalty & Zero Layout Shifts

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A/B testing is essential for Conversion Rate Optimization (CRO). However, traditional third-party experimentation tools (Optimizely, VWO, Google Optimize) introduce severe architectural flaws: The Flash of Original Content (FOOC): The browser downloads the original page, displays it for 150ms, the tracking script downloads, parses, and swaps out the headline. Users see a distracting visual glitch. Devastating Cumulative Layout Shift (CLS): Dynamic DOM mutations push your CLS scores above 0.25, triggering Google search ranking penalties. Bloated Client Bundles: Third-party vendor SDKs inject 80

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I compared 1,489 eSIM plans in 199 countries. Price per GB varies 105x

Disclosure: we run Bitcall, which sells travel eSIMs. The prices below come from our own catalogue, so read them as one provider's prices on one date, not a survey of the market. We wanted to answer a simple question: how much does mobile data cost a traveller around the world? We had the data on our own site, so we turned it into a small price index. Here is how it works, with the code and a few things that surprised us.

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ProgrammingDEV Community ·

I Built an AI 3D WebGL Portfolio Generator That Gives You Full Source Code Export

Hey everyone! 👋 Like many developers, I noticed a frustrating tradeoff when creating a technical portfolio: Option A: Spend 40+ hours coding a custom website from scratch and maintaining it whenever you finish a new project. Option B: Use generic website builders that give you flat 2D templates, charge high monthly fees, and lock your code inside proprietary walled gardens. To solve this, I built MyFolio — an AI-powered 3D spatial portfolio generator that transforms your GitHub repositories and PDF resume into an interactive 3D WebGL website in under 60 seconds, with 100% standalone source co

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ProgrammingDEV Community ·

What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization

What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization On October 1, 2026, the Ethereum Foundation and the Open Anonymity Project launched zkAPI — live on Ethereum mainnet. Deposit ETH or USDC into a vault, sign a zero-knowledge proof, receive a temporary API key with a predetermined spending cap, and pay for AI models and metered APIs without revealing who you are. "Every AI API call today carries an identity," the announcement post said. "Your API key points to an account, the account to a payment method, and every prompt you send joins the record attached to both.

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ProgrammingDEV Community ·

El que construye la IA es el que más la teme. Y tiene razón

El hombre que dirige una de las IAs más potentes del mundo dice que hay un 25 % de probabilidad de que las cosas salgan muy, muy mal, y en septiembre de 2026 fue más lejos: "durante demasiado tiempo la industria le mintió a la gente sobre el hecho de que esta tecnología tiene riesgos". No lo dice un crítico externo. Lo dice Dario Amodei, el que la construye. Y ahí está la pregunta incómoda: ¿por qué el que está más cerca es el que más miedo tiene? La respuesta no es la de las películas.

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