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Free Calculators
Free, no-signup calculators that give clear answers on money and tech decisions — starting with German health insurance.
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Join VoidInsider — it's freeSelf-Hosting & Privacy
Every Compose stack you copy from a README defaults to the same handful of ports. Here is how host vs container ports actually work, why multi-stack homelabs collide, and when to add a reverse proxy instead of publishing ports directly.
You ran docker-compose up -d on a box where that exact command has worked a dozen times before - or a Pi you just flashed, or a Synology you just rebooted - and the shell answers docker-compose: command not found. Docker itself is clearly installed; docker ps works fine. So what broke?
Bitdefender SecurePass, Kaspersky, and Norton all bundle a password manager into their antivirus suite — here is what each one actually includes, and skips, versus Bitwarden.
Money in Germany
100% and 110% Vollfinanzierung let you skip the deposit, but at a real cost: +0.70pp to +1.2pp on the rate. What that means in euros, what lenders require, and the expat-specific qualifying bar nobody's German-language guide covers.
Every Baufinanzierungsrechner computes the same annuity: loan x (Sollzins + Tilgung) / 12. See it worked on a EUR 320,000 loan, compare bank, broker and portal calculators, and learn what the result leaves out.
Every Riester calculator online gives you a number with no formula behind it. Here's the actual Grundzulage + Kinderzulage + 4%-Eigenbeitrag math, worked by hand for a single earner and a two-child family.
Tech
Two things flip the old advice in 2026: Spotify now has real lossless audio, and Apple Music is cheaper on most tiers. A decision table routing you to the one factor that should decide it, plus links to the full sound-quality, price, and three-way breakdowns.
Spotify Family now costs $21.99/mo. A real cost and maintenance-time comparison against self-hosting Navidrome on hardware you already own, a dedicated Pi, or a cheap cloud VPS -- and when it's actually worth ditching streaming.
Every self-hosted apps roundup is an unvetted list with no honest 'skip this one.' Six categories actually tested on a homelab — AI chatbot, music, automation, Reddit, Git, and CI/CD — with real hardware cost and one category that isn't worth it for most people.