Checked 28 Oct 2026 · Sources · All comparisons
WhatRuns alternative
WhatRuns is a free browser extension: open a site, press the button, see what it runs. Tellstack is for when you need the same answer for a thousand sites, from code.
Get a free keySide by side
| Feature | Tellstack | WhatRuns |
|---|---|---|
| Price | Free for 100 lookups a month; £49 a month for 10,000 | Free: “It’s free”, “No sign-up required”. Its pricing page shows no plans |
| How you use it | An API: one domain, or bulk jobs of up to 10,000 | A browser extension for Chrome and Firefox, one site at a time |
| API | REST, every plan, OpenAPI 3.1 spec | None found on its site |
| Sites using a technology | Lists from our own index, most visited first | Not offered |
| Changes | Watches on a domain or technology, sent to signed webhooks | Follow a site and it tells you when it starts or stops using a technology |
| Technologies | 7,647, from open fingerprints | “Thousands of Technologies” |
| Users | New in October 2026 | “450k+ happy active users” |
Where WhatRuns is stronger
- It’s free and needs no account.
- It works on the page open in your browser. Our crawler fetches pages without running JavaScript, so it misses some technologies that only scripts load.
- One click on the site you’re already looking at, with no code.
Where Tellstack fits
- Many sites at once: send a CSV of domains and get a CSV back.
- From your own code, a spreadsheet or a CRM workflow, through the API.
- Lists of sites using a technology, and webhooks when a watched site changes.
Sources
Read on 28 Oct 2026.
- whatruns.com: what it is, price, technologies, users, follow
- whatruns.com/downloads: browsers
- whatruns.com/pricing: no plans shown
WhatRuns is a trademark of its owner. Tellstack is made by Onibaku and isn’t affiliated with or endorsed by WhatRuns. Spot something out of date? Email admin@onibaku.co.uk and we’ll correct it.