Who pays for free developer tools?

Every free tool site has a bill to pay. The interesting question is who pays it and with what.

Model 1: advertising

The most common answer. It is honest enough, but ad networks bring third-party scripts, trackers and layout shift — and the incentive is to keep you scrolling rather than to finish your task quickly.

Model 2: your data

Tools that upload your input to a server can log it. A JSON formatter that posts your payload somewhere is a liability if that payload holds tokens, customer records or internal schemas. This is the model you cannot see from the outside, which is exactly why it works.

Model 3: the upsell

Free tier, watermark, "sign up to export". Fine when it is transparent, frustrating when the limit shows up after you have done the work.

Model 4: donations

Slowest, but it keeps the incentives aligned: no ads to serve, no data to sell, no artificial limits to enforce.

How Coders Hub is built

Most tools run entirely in your browser — the file or text never leaves your machine. The few that genuinely need the network (DNS lookups, header checks, URL fetching) go through a small relay we run ourselves rather than a third-party API. There is no account system, so there is nothing to leak.

That runs on donations. If a tool here saved you an afternoon, the support page has UPI, PayPal and Buy Me a Coffee options — and sharing a link works too.