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120 free browser-based developer utilities. No sign-up required.

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ListingSafe is a free Etsy compliance scanner that checks your listing titles, descriptions, and tags against 1,000+ trademarked terms and Etsy policy rules before you publish.
Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | devtoolstack.io | justaduck.app |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Taiwan · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of DeveloperToolStack yet.
ListingSafe scans your Etsy listings for trademark and policy risks before you publish — so you can fix problems before they turn into takedowns or account suspensions. What it checks: Titles, descriptions, and tags against 1,000+ trademarked terms and common Etsy policy violations (prohibited...
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ListingSafe — Protect Your Etsy Shop from Trademark Violations
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DeveloperToolStack and ListingSafe.app.
ListingSafe.app's answer:
ListingSafe checks trademarks against the live USPTO database instead of a static keyword list, so results reflect actual current registrations. It also goes beyond detection: it suggests safer rewrites for risky wording and can generate an appeal letter if a listing has already been taken down.
ListingSafe.app's answer:
Most Etsy tools (eRank, Marmalead, Alura) focus on SEO and keyword research. ListingSafe solves a different problem: avoiding trademark and policy takedowns. If you sell personalized or fan-adjacent items and worry about words like "Koozie" or "Onesie" being trademarked, that's exactly what ListingSafe checks for.
ListingSafe.app's answer:
Etsy sellers — mostly solo makers and small handmade shops who sell personalized or custom items and want to make sure their titles, tags, and descriptions won't trigger a trademark complaint or policy violation.
ListingSafe.app's answer:
It started after seeing how many Etsy sellers get blindsided by trademark takedowns — often for words they had no idea were trademarked. Reinstating a suspended listing is stressful and slow, so ListingSafe was built to catch those problems before publishing instead of after.
ListingSafe.app's answer:
ListingSafe runs on Spring Boot with PostgreSQL, hosted on Railway. Scanning is powered by Google Gemini combined with a curated trademark/policy rules library and live USPTO API lookups. Billing is handled by Paddle, and the browser extension is built on Chrome Manifest V3.
ListingSafe.app's answer:
Independent Etsy sellers and small handmade shops — ListingSafe is a tool for individual sellers, not enterprises
Share your experience with using DeveloperToolStack and ListingSafe.app. For example, how are they different and which one is better?
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