About Toolflux

Toolflux is a collection of small, focused browser tools for developers, freelancers, and anyone who needs to calculate, convert, or quickly understand something. Each tool does one clear job - work out an hourly rate, format JSON, convert Roman numerals, check a hash - and runs entirely in your browser, no signup.

How we build tools

Every Toolflux tool shows its work. The output sits beside the explanation, not behind it. You leave with a result and with a slightly clearer picture of how that result came about.

A few examples from the current catalogue:

  • Hourly rate calculator - target salary, billable days, overhead and utilisation are all visible inputs. Move one slider and the result moves with it, the way you'd expect.
  • Password generator - instead of a "strong / weak" badge, you get an entropy value in bits plus a short explanation of what that number means in practice.
  • Base64 encoder - the encoding is laid out step by step: 3-byte input chunks as chips, the matching 4-character output blocks next to them, padding visible as = signs. One look and the algorithm clicks.
  • Hash generator - an avalanche visualisation shows what happens when you flip a single input bit: roughly half the hash bits flip with it.

The principle is short: anyone who uses a tool should leave understanding it better, not less.

What we don't do

A few things deliberately left out, so you know what to expect:

  • No signups, no accounts. Tools run directly, no registration wall in front of them.
  • No hidden trackers. No marketing cookies. Audience measurement (PostHog) is anonymous and cookieless, with no individual profiles.
  • No AI-generated tool stubs that don't do real work. Each tool is built against a concrete use case, not against a keyword volume.
  • No input data sent to third parties. Calculations run locally in your browser; your inputs stay on your device.

How Toolflux came to be

Toolflux launched on April 21, 2026 as a 30-day build challenge in Germany: one tool per day, each with a built-in explainer, all browser-only. After the first month: new tools every week, same approach.

Every launch is logged on X/Twitter and Bluesky, which both function as a running changelog.

The DACH focus for selected tools is intentional: German-language calculators (hourly rates, gross/net salary, VAT, working days) usually sit behind walled gardens or ad-heavy pages with thin explanations. Toolflux fills that gap directly, without a login layer on top.

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