Stack Online Tools – Developer Utilities is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
Productivity and developer tools with JSON formatter, text converters, password generator, SEO tools, and calculators.
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| Stack Online Tools – Developer Utilities (original) | — | — | Free | Productivity and developer tools with JSON formatter, text converters, password generator, SEO tools, and calculators. |
| website broken link and 404 error checker | — | — | Free | A SEO tool to fast find all broken links on your websites to Rank Higher. |
| AI SEO Assistant | — | — | Free | One-click SEO prompts for ChatGPT and Claude: keyword strategy, blogs, outrank, AI search, schema and content audits. |
| SEOFOMO News | — | — | Free | Stay updated with the latest SEO trending stories from SEOFOMO News. Get instant notifications about new stories in your browser. |
| SERP Screenshot HD | — | — | Free | Capture crystal-clear, full-page SERP screenshots with automatic data-rich naming for effortless SEO audits. |
| Squarespace Image Optimzer | — | — | Free | Resize and compress images locally for SEO with Gumroad subscription limits. |
| Developer Tool in One: SEO, Ruler & Text Checker And More | — | — | Free | All-in-one web developer toolkit. Inspect SEO, audit colors, measure with a page ruler, check text, and capture screenshots. |
| Omnitool — Web Developer Multi-tool | — | — | Free | The web developer multi-tool: header rules, screenshots, recorder, color picker, tech stack, SEO & more. No third-party code. |
| SEOquake | 4.5 | 1M+ | Free | Anyone who wants a broad SEO toolbar without paying, and is willing to spend ten minutes configuring it |
| Keywords Everywhere | 4.5 | 1M+ | Paid | Keyword research in the flow of browsing, for people happy to buy credits instead of a full platform |
| MozBar | 3.3 | 900K+ | Freemium | Sizing up competitor difficulty at a glance, especially for teams already invested in Moz Pro |
A SEO tool to fast find all broken links on your websites to Rank Higher.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: A SEO tool to fast find all broken links on your websites to Rank Higher.
One-click SEO prompts for ChatGPT and Claude: keyword strategy, blogs, outrank, AI search, schema and content audits.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: One-click SEO prompts for ChatGPT and Claude: keyword strategy, blogs, outrank, AI search, schema and content audits.
Stay updated with the latest SEO trending stories from SEOFOMO News. Get instant notifications about new stories in your browser.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: Stay updated with the latest SEO trending stories from SEOFOMO News. Get instant notifications about new stories in your browser.
Capture crystal-clear, full-page SERP screenshots with automatic data-rich naming for effortless SEO audits.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: Capture crystal-clear, full-page SERP screenshots with automatic data-rich naming for effortless SEO audits.
Resize and compress images locally for SEO with Gumroad subscription limits.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: Resize and compress images locally for SEO with Gumroad subscription limits.
All-in-one web developer toolkit. Inspect SEO, audit colors, measure with a page ruler, check text, and capture screenshots.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: All-in-one web developer toolkit. Inspect SEO, audit colors, measure with a page ruler, check text, and capture screenshots.
The web developer multi-tool: header rules, screenshots, recorder, color picker, tech stack, SEO & more. No third-party code.
Why it replaces Stack Online Tools – Developer Utilities: Covers similar ground in the SEO category: The web developer multi-tool: header rules, screenshots, recorder, color picker, tech stack, SEO & more. No third-party code.
Instant on-page SEO audit and SERP metrics overlay.
Why it replaces Stack Online Tools – Developer Utilities: Another popular SEO extension: Instant on-page SEO audit and SERP metrics overlay.
Keyword volume, CPC and competition data inside search results.
Why it replaces Stack Online Tools – Developer Utilities: Another popular SEO extension: Keyword volume, CPC and competition data inside search results.
Domain and page authority metrics on every SERP.
Why it replaces Stack Online Tools – Developer Utilities: Another popular SEO extension: Domain and page authority metrics on every SERP.
Direct comparisons with the extensions people weigh against it.
website broken link and 404 error checker is the closest match. Covers similar ground in the SEO category: A SEO tool to fast find all broken links on your websites to Rank Higher.
Yes — website broken link and 404 error checker, AI SEO Assistant, SEOFOMO News are free.
