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Build a Free Tool

A calculator your industry actually uses puts your name in front of practitioners permanently.

10,002 viewsMedium effortPays off in 3-9 monthsEngineers and developersAnalystsTechnical specialistsCareer switchers into tech
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In short

A small free tool — a calculator, template, checklist or converter — that solves a recurring problem in your field gets bookmarked, shared and used for years. Unlike a portfolio piece nobody visits, a useful tool keeps introducing you to practitioners indefinitely.

The situation

Somewhere in an industry, thousands of people do the same fiddly calculation in a spreadsheet they rebuild badly every time. Everyone knows it is annoying. Nobody has fixed it.

Someone builds a small web page that does it properly. It takes a weekend. It is free and requires no sign-up.

Two years later it is bookmarked by several thousand practitioners, linked from forum threads whenever the question comes up, and mentioned in a trade publication.

The footer says who built it, with a link.

Why this works

A useful tool is one of the few assets that keeps working without further effort, and it reaches people in a context of gratitude rather than solicitation.

Most portfolio work is inert: a case study is read once by someone already evaluating you. A tool that solves a recurring problem is used repeatedly by people who found it because they needed it. Every use is a small positive encounter with your name.

It also demonstrates capability in a complete way. Identifying a real problem, building something that solves it, making it usable enough that strangers succeed with it and maintaining it is a fuller demonstration of judgement than most employed work produces publicly.

The discovery mechanism compounds. Genuinely useful tools get shared in forums, linked in answers and mentioned when the question recurs. That produces search visibility and word-of-mouth reach that no amount of self-promotion achieves.

Crucially, the audience self-selects into exactly the right people. Nobody uses a niche industry calculator unless they work in that industry, so your users are practitioners, managers and the people who hire.

The bar is lower than it appears. It does not need to be technically impressive; it needs to remove genuine friction. Some of the most-used tools in any field are single pages that do one thing correctly.

How to run it

  1. 1

    Find the repeated annoyance, not the big problem

    The calculation everyone redoes, the template everyone rebuilds, the conversion everyone looks up. Small and frequent beats large and rare.

  2. 2

    Solve one thing completely

    A tool that does one job correctly is used. A tool attempting five jobs partially is abandoned.

  3. 3

    Remove every barrier to use

    No sign-up, no email capture, no paywall. Friction destroys adoption and adoption is the entire point.

  4. 4

    Put your name on it without shouting

    A modest footer credit with a link. Heavy self-promotion undermines the generosity that makes it spread.

  5. 5

    Tell the places where the problem is discussed

    Share it in the forums and communities where people ask about this. That is the initial distribution.

  6. 6

    Keep it working

    A broken tool is worse than none. Minimal maintenance is the cost of a permanent asset.

What to say

Copy, then make it yours
Hi Priya, I'm applying for the senior analyst role. You may already know the tool — I built the freight-class calculator that comes up in most of the industry forum threads about NMFC classification. It has had around forty thousand uses since I put it up, and I still maintain it. I built it because I was doing the lookup manually several times a week and it seemed absurd that nothing existed. It's free, there's no sign-up and it's not a lead magnet for anything. I mention it because it's probably a better indication of how I work than my CV is: I noticed a repeated annoyance and fixed it properly. — Ezra

When it does not work

  • Gating it behind an email. Requiring sign-up destroys adoption and converts a gift into marketing. Free means free.
  • Building something impressive rather than useful. Technical ambition is irrelevant. Removing friction is the whole value.
  • Letting it break. An abandoned tool that stops working damages the impression it built. Budget minimal ongoing maintenance.
  • Solving a problem nobody has. Verify that people genuinely struggle with this before building. Ask in the relevant communities first.
  • Liability for wrong answers. Tools producing financial, legal, medical or safety-relevant outputs carry real risk. Include appropriate disclaimers.
The takeaway

A portfolio piece is read once by someone assessing you. A useful tool is used weekly by people who are glad it exists.

Questions

What kind of tool should I build?

Something that removes a small, frequent annoyance rather than solving a large rare problem. The calculation people redo in a spreadsheet every week, the template everyone rebuilds badly, the conversion or lookup people search for repeatedly. Frequency matters more than sophistication, because a tool used weekly by a few thousand people produces far more cumulative exposure than an impressive one used occasionally. Ask in industry communities what people find tedious before building anything.

Should I capture emails or require sign-up?

No. Gating destroys adoption, and adoption is the entire mechanism. A tool requiring registration converts a gift into a marketing funnel, which changes how people perceive it and how willingly they share it in forums and answers. The value you are seeking is thousands of positive encounters with your name over years, not a mailing list. Free with a modest footer credit produces far more than a gated tool with better conversion metrics.

Do I need to be a developer to do this?

Not necessarily. Many of the most used tools in any field are spreadsheets, templates, checklists or reference documents rather than web applications. A well-built spreadsheet template that handles a common calculation properly, shared freely, produces the same effect as a web tool. The technical form matters far less than whether it removes genuine friction for people who do that work regularly.

What are the risks?

Two main ones. A tool that breaks and stays broken damages the impression it built, so budget for minimal ongoing maintenance as the cost of a permanent asset. More seriously, tools producing outputs used for financial, legal, medical or safety decisions carry genuine liability exposure if they are wrong. Include appropriate disclaimers, be conservative about what you claim the tool does, and think carefully before building anything where an error could cause real harm.

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