About
Small tools, taken seriously.
Utility Belt is a growing collection of focused web tools, organized by discipline. We're starting with a Marketing toolkit and adding new verticals — Finance, Developer, Creator — as tools are ready.
What Utility Belt is
Utility Belt is a free, browser-based platform of single-purpose web tools for marketers, operators, analysts, and small-business owners. Each tool does one job — build a tracked link, calculate a return on ad spend, clean a list, generate a QR code — and gets out of the way. There are no dashboards to learn, no trials to start, and no upsells between you and the result.
The platform is organized by discipline. Marketing is live today with ten tools, and additional verticals for Finance, Developers, and Creators are planned. Every tool is designed to be linkable, shareable, and bookmarkable so you can return to the exact utility you need without navigating through menus.
Who it's built for
Utility Belt is built for the people who spend their days assembling campaigns, debugging tracking, reconciling spreadsheets, and shipping content. Typical users include performance marketers building UTM-tagged links for paid campaigns, growth analysts checking ROAS and CAC against targets, e-commerce operators calculating margin and markup on new SKUs, and content marketers generating QR codes for offline campaigns.
It's also for SEO specialists inspecting URL parameters, account managers standardising campaign naming conventions, ops people cleaning audience CSVs before upload, and remote teams planning meetings across time zones. If you've ever opened a browser tab just to do one small calculation or formatting task, Utility Belt is meant for you.
What makes it different
Most "free tool" sites are built to capture leads or push you into a SaaS funnel. Utility Belt is the opposite: tools work immediately, accounts are optional, and the calculations happen in your browser so your inputs don't have to leave your device. We treat privacy, consent, and security as defaults rather than settings, and we resist adding features that turn a simple tool into a workflow you have to manage.
Tools available today
The Marketing vertical currently includes 10 tools:
- UTM Builder — Build trackable campaign URLs with validated UTM parameters.
- URL Parameter Inspector — Parse URLs and decode every query parameter at a glance.
- QR Code Generator — Turn campaign URLs into PNG or SVG QR codes.
- Slug & Filename Cleaner — Convert messy text into clean URL or filename-safe strings.
- Google Ads Headline Checker — Check headline and description length with pass/warn/fail.
- Campaign Name Generator — Generate consistent campaign names from a naming convention.
- ROAS / CAC / LTV Calculator — Calculate return on ad spend, CAC, and lifetime value.
- Margin & Markup Calculator — Compute margin, markup, and profit with reverse-calc.
- CSV Audience List Cleaner — Normalize headers, trim spaces, and dedupe rows in pasted CSV.
- Time Zone Overlap Planner — Compare time zones and visualize shared working hours.
Principles
One job, done well
Each tool solves a single, concrete problem — no dashboards, no onboarding, no pricing page in the way.
Fast by default
Pages load quickly, tools run in your browser where possible, and nothing waits on a sign-in wall.
Quiet on data
We collect the minimum needed to keep things running. Inputs to client-side tools never leave your device.
How the platform is built and maintained
Utility Belt is a TanStack Start application written in TypeScript and React, server-rendered for fast first paint and search-engine friendliness. Account features — saved runs and favorites — are backed by Supabase with row-level security so each user can only read and write their own records. Analytics use a cookieless first-party setup gated by an IAB-registered consent platform, and ads (where shown) are kept out of forms and primary actions.
Tools and content are updated continuously based on user feedback. When something is broken, slow, or missing, we'd rather hear about it directly than guess. The roadmap is driven by what people actually request, not by what's easiest to monetise.
Privacy, security, and compliance by design
We design Utility Belt so most tools run in your browser, accounts stay optional, and the data we store is limited to what's needed to provide account features and respond to user requests.
Most tools run in your browser
Calculators, formatters, validators, and generators execute client-side. Inputs you paste aren't transmitted to our servers during normal use.
Accounts are optional
Core functionality works without signing in. Auth only unlocks saved runs and favorites.
Minimum practical data
We store what's needed to run account features and respond to feedback — nothing more. We don't sell personal data.
Privacy & data-rights process
We maintain a documented workflow for access, correction, deletion, and export requests via the Feedback page.
Security by design
Row-level security, scoped access so users only see their own data, encrypted transport, and ongoing dependency review.
We build with privacy, security, and compliance in mind from the start, document our practices clearly, and maintain a process for access, correction, deletion, and other privacy requests. For the details, see our Privacy Policy and Terms, or use the Feedback page to submit a privacy / data request.
Get in touch
Have a tool to suggest, a bug to report, or a question about how something works? The Feedback page is the fastest way to reach us. We read every submission.