Is Major Cooked? Free AI risk score + roast for your college major
Solo Era solo activities, solo maxxing, sidequests, challenge
Keepsake Project Management, Freelancers, DesignersDeveloper tool ideas: 13 tools developers would adopt or pay for
A good developer tool ideas list starts with a recurring annoyance that costs a developer minutes several times a week, then asks whether it can be fixed by a tool installed in under a minute. The thirteen below follow that rule. Each names who feels the pain, a first version, how it spreads between developers, and whether the money comes from the developer or from their employer.
What makes a developer tool worth building?
Developers adopt tools that remove a specific, repeated irritation and cost almost nothing to try. They abandon tools that need a meeting to set up. So the question is not “is this a big market” but “does the first run work in one command, and does the second run save time.”
Three things separate tools that spread from tools that sit in a repo:
- Frequency. The pain happens weekly or daily. A tool for a problem you hit once a year gets forgotten between uses.
- A visible output someone else sees. A pull-request comment, a badge, a shared link or a generated file. That output is how the tool reaches a colleague.
- Low trust required. A tool that needs read access to all code or production secrets is hard to adopt. A tool that works on pasted text or local files is easy.
Several entries below started as posts in the developer-tools category on the board, and they share the shape: narrow, and tied to a named moment, like a deploy that broke or an expression nobody can read. The board does not show demand, only what people wrote down.
Which developer tool ideas are worth considering?
Ordered by how easy it is to reach a first paying or committed user, not by how large the idea could become. The first few are small enough for one person. The last few have more upside and more work.
01 Cron expression explainer
Explains a cron expression in plain English, shows the next run times, and converts a sentence back to an expression.
- Who it’s for
- Anyone who inherits a crontab or a scheduler config.
- First version
- A single page with a text box and a sentence under it, plus a copyable link for the explanation.
- How it spreads
- Developers paste the shareable link into a ticket or chat.
- How to test demand
- Give five developers an expression they have never seen and time how long it takes them to understand it with your page versus without.
Free explainers for this already exist, which is useful information: you would be competing on clarity and speed, not on awareness. Money is hard here because the existing alternatives are free. Treat it as a distribution asset for a larger tool, not as a business on its own.
Read “Cron expression explainer” on the board and copy its build prompt →
02 Environment diff between two deploys
Shows which environment variable changed between the deploy that worked and the one that did not.
- Who it’s for
- Developers on small teams who deploy often and debug at night.
- First version
- Paste two exports, get added, removed and changed keys with values masked.
- How it spreads
- The output is a paste-able summary for the incident channel.
- How to test demand
- Ask in a hosting provider’s community which variable bugs they last chased.
The moment is vivid, which makes this easy to explain in one sentence. The commercial path is a plugin for a deploy platform that runs the diff automatically on every failed deploy. That integration is where a team would pay; the paste-in version is the free front door. The board has the original idea.
Read “Environment diff between two deploys” on the board and copy its build prompt →
03 Changelog that users read
Turns pull requests into a short changelog page written for the product’s users instead of its developers.
- Who it’s for
- Small SaaS teams and open-source maintainers.
- First version
- Connect a repo, pick a tag range, get a Markdown changelog grouped by type of change.
- How it spreads
- The changelog page is public and carries a small “made with” link.
- How to test demand
- Generate changelogs for five public projects and email the maintainers the result.
This one has an employer as the buyer: a founder wants release notes that exist, and will pay a small monthly amount for not writing them. The risk is that a model invents changes. Make every line link back to a pull request so the reader can check it. The idea is posted as a changelog your users actually read.
Read “Changelog that users read” on the board and copy its build prompt →
04 Repo shipper
Takes a GitHub repository and walks it to a launchable state with README, license, demo link and a checklist.
- Who it’s for
- Developers who finish code but never publish it.
- First version
- A checklist generated from the repo’s contents: missing README sections, no license, no screenshot, no install command.
- How it spreads
- Each published repo can carry a badge for the checklist.
- How to test demand
- Run it on twenty public repos and see how many have the same three gaps.
Useful for side projects that stall just before release. The checklist is deterministic and cheap; the paid layer would be doing the fixes for you with pull requests. The board has the Github Repository Shipper idea.
Read “Repo shipper” on the board and copy its build prompt →
05 Closest-to-finished repo ranking
Ranks your unfinished repositories by how little work stands between them and done.
- Who it’s for
- Developers with many half-built side projects.
- First version
- Score by recency, open TODOs, tests present, README present; show the top three.
- How it spreads
- People share their top-three list.
- How to test demand
- Post your own ranking and see whether others ask for theirs.
This is a personal tool more than a business, and that is fine. It makes a good open-source project with a hosted option, and it pairs naturally with the repo shipper above. The scoring rules should be public so users trust them. Read the original idea.
Read “Closest-to-finished repo ranking” on the board and copy its build prompt →
06 Documentation link and anchor checker
Finds broken links and missing anchors in a docs site before readers do.
- Who it’s for
- Maintainers of open-source docs and small API companies.
- First version
- A command that runs on a built folder in CI and fails the build on broken internal links.
- How it spreads
- A CI step in a public repo is visible to every contributor.
- How to test demand
- Send pull requests that fix real broken links, mention the tool in the description, and see who installs it.
Free command-line tools earn trust; the paid version checks external links on a schedule and emails the team. That schedule is the part developers will not run themselves, so it is where a subscription makes sense.
07 Staging data that scrubs itself
Copies production-shaped data to staging with personal fields replaced and an expiry date on the copy.
- Who it’s for
- Small engineering teams with a compliance headache and no data engineer.
- First version
- A config file naming columns to scrub, deterministic fakes, one database engine.
- How it spreads
- Through the security or compliance reviewer who asks how staging data is handled.
- How to test demand
- Ask in two engineering communities how people populate staging and count the answers that are “we copy production”.
Higher trust required, because the tool sees real data. Ship it as a local command first, so nothing leaves the customer’s machine. Teams pay for this to answer an audit question, not for convenience, so the buyer is whoever signs off on risk. The board has the staging data idea.
Read “Staging data that scrubs itself” on the board and copy its build prompt →
08 Pull request size and risk comment
Comments on each pull request with its size, the files that change most often, and the tests that did not change.
- Who it’s for
- Reviewers on teams that merge many small pull requests.
- First version
- A GitHub Action that posts one comment with three numbers and no opinions.
- How it spreads
- The comment appears on every pull request, in front of the whole team.
- How to test demand
- Install it on your own repos for a month and see whether you would be annoyed to remove it.
Visible output is the growth mechanism here. The danger is noise: a comment that says nothing useful gets muted in a day. Start with data only (size, churn history) and add judgments after people ask for them.
09 Local mock server from recorded traffic
Records real API responses once and replays them as a mock server for tests and demos.
- Who it’s for
- Front-end developers who wait on a back end, and test authors whose suite depends on a live service.
- First version
- A proxy that saves responses to files and replays them by method and path.
- How it spreads
- Recorded fixtures get committed to the repo, and the next developer runs the same command.
- How to test demand
- Offer it to two teams with flaky integration tests and measure test time before and after.
Established alternatives exist, so the pitch has to be a narrower experience: zero config, one command, fixtures in readable files. Be honest on the page about who it is not for.
10 Secrets leak scanner for pasted code
A browser tool that checks a snippet for API keys and tokens before you paste it into a chat, ticket or forum.
- Who it’s for
- Developers who paste logs into public places.
- First version
- Pattern checks for common key formats, run entirely in the page, no upload.
- How it spreads
- Someone posts it in the community that keeps seeing leaked keys.
- How to test demand
- Track whether users come back; a tool used once is a poster, not a habit.
The no-upload promise is the product. Say so up front and make it verifiable: a page that works with the network disconnected. A paid angle exists as a team plugin for editors, but the free page is the distribution.
11 Dependency update digest
A weekly email that summarizes what changed in the libraries your project depends on, in plain terms.
- Who it’s for
- Solo developers and small teams who ignore dependency bot noise.
- First version
- Upload a lockfile, get a digest of breaking changes and security notices for the packages it lists.
- How it spreads
- Forwarded emails and team inboxes.
- How to test demand
- Hand-write the first four digests for ten volunteers and see if they open them.
Hand-writing the first digests is the test. If readers open them four weeks in a row, automate. If they do not, you saved yourself a build. The accuracy bar is high: a wrong breaking-change claim loses trust fast.
12 Agent that answers from your docs and stays quiet otherwise
A support assistant that answers only from your documentation and says it does not know when the docs are silent.
- Who it’s for
- Small API and SaaS companies drowning in repeat questions.
- First version
- Index a docs folder, answer with the quoted passage and link, refuse when nothing matches.
- How it spreads
- Each answer shows its source, and readers notice.
- How to test demand
- Put it on one project’s support channel and track the share of questions it handles without a human.
A crowded space, so differentiate on the refusal behavior: a tool that says “not in the docs” is more trustworthy than one that guesses. Measure it by sampling answers weekly and checking each against the source. See the idea on the board.
13 A phone number for your side project
A real phone number that forwards calls and texts for a side project without exposing a personal number.
- Who it’s for
- Indie developers who need a contact number on a site or in an app store listing.
- First version
- One number per project, voicemail transcribed to email.
- How it spreads
- Through indie maker communities.
- How to test demand
- Check the telecom provider’s costs and rules in your target countries before promising anything.
The idea is simple; the operations are not. Telephony has regulation, abuse and per-country rules, so this belongs at the bottom of the list. It is here because the board idea names a real gap and shows how a developer-tool idea can be an infrastructure idea.
Read “A phone number for your side project” on the board and copy its build prompt →
How was this list chosen?
Editorial judgment against four criteria: the pain recurs, the first version is small, the output is visible to a second developer, and the trust needed to try it is low. There is no market-size data and no revenue data behind it. Where a developer-tools idea on the board matched, it is linked, and the rest are patterns we would look at first.
Post your build ideas is run by one independent developer in Switzerland, so the bias is toward tools one person can start. If you want to build something larger, treat these as entry points.
How do developer tools actually make money?
| Model | Works when | Watch out for |
|---|---|---|
| Free tool, paid team plan | The output is shared and a team wants history or permissions | Teams of five rarely want to pay for what one person got free |
| Usage-based | Cost scales with runs, scans or API calls | Surprise bills lose trust; show usage before it bills |
| Open core | The core gets adopted by individuals, the extras are for companies | You must decide early which features never go paid |
| One-time license | Local software with no server costs | No recurring revenue, so support has to stay light |
| Sponsorship or consulting | The tool is a calling card | It is a job, not a product; be honest with yourself about which you are building |
Price after you have users who would be upset if the tool disappeared. How to price a micro-SaaS covers the mechanics, and launching without an audience covers how a developer tool finds its first fifty users.
How do you pick one and test it before building?
- Pick the one whose pain you felt in the last month. Your own recent annoyance beats a cleverer idea.
- Write the one-command install and the one-line output on paper. If it takes more than that, cut it.
- Build the free version in a weekend. The weekend project list shows how to cut scope, and Claude Code project ideas shows which tools an agent can finish for you.
- Put it where the pain is discussed: a repo’s issue tracker, a community thread, a pull request that uses it.
- Count a return use, not a first visit. Decide the number in advance.
For a structured way to plan the test, try the app idea validation planner. To see what other people want built, browse the developer-tools ideas or post an idea you won’t build yourself. If your tool is aimed at companies rather than individuals, B2B SaaS ideas covers buyers and switching costs.
Frequently asked questions
What is a good developer tool idea?
One that removes a repeated, specific annoyance and installs in under a minute. Good ideas name a moment, such as a deploy that broke or a config nobody can read, and produce an output another developer sees. Frequency matters more than size: a small pain hit weekly beats a large pain hit yearly.
Do developers pay for tools?
They do, usually when an employer pays or when the tool saves clear time on a recurring task. Individual developers resist paying for things they can replace with a script. The strongest pattern is a free tool that individuals adopt and a paid plan for teams that need sharing, history or compliance.
Should a developer tool be open source?
Often yes, because open code lowers the trust barrier, especially for tools that touch source or secrets. Decide early what stays free forever and what is paid. Open source is a distribution choice more than a pricing choice, and it does not stop you from selling a hosted version or a team plan.
How do I find developer tool ideas?
Keep a note of every time something wastes your time for more than ten minutes, then look for the ones that repeat. You can also read the developer-tools ideas on Post your build ideas, where people post tools they want and will not build themselves. Every idea comes with a ready build prompt.
How fast can I build a developer tool MVP?
A single-purpose command-line tool or web page can be done in a weekend if you hold the scope to one input and one output. Integrations, accounts and billing are what stretch the time. Ship the free local version first and add those only after someone asks.
Created with AI assistance and edited for this site. Examples are illustrative and do not represent customer research. About the publisher.