1lookup

Data and validation APIs

From $2.00

per 1,000 tech stack lookups; $4.95 on Starter

Website technology data

No public price; sold by quote

whatruns.com

One tab at a time vs a whole list by API

WhatRuns is a free browser extension for the site in your tab, and 1Lookup reads what a whole list of websites runs on, by API or CSV, for $0.005 a site that answers.

Looking for a WhatRuns alternative? This page sets WhatRuns pricing beside 1Lookup, with every WhatRuns figure taken from its own published pages, checked October 2026.

Start the 7-day free trial See per-lookup pricing

7-day free trial on every plan
No contract and no minimum volume

1
Credit per site that answers
about $0.005 on Starter
6,000+
Technologies recognised
open fingerprints, kept current
0
Credits when a site blocks the check
or does not exist
11
Groups in every answer
CMS to security

At a glance

Here is where 1Lookup wins against WhatRuns, and where WhatRuns still wins.

Both tell you what a website is built with. WhatRuns is a free Chrome extension with no sign-up: one click shows the technologies of the site open in your browser, and it can alert you when a site you follow changes a tool. 1Lookup is an API and a CSV upload: the CMS, shop platform, analytics, marketing tools, hosting and frameworks of every site on a list, with versions, detected from its headers, HTML and DNS, plus the email provider from MX, one row per site.

1lookupWhere 1Lookup wins

An API and a CSV upload: a whole list of websites in one job, one row per site, where an extension reads one tab
About $0.005 a site that answers on Starter, and nothing for a blocked or missing site
Flat fields for a CRM column, with versions and the email provider from MX
A free checker on the site for one-off looks, with no sign-up

What it costs

From $2.00

per 1,000 tech stack lookups; $4.95 on Starter

Where WhatRuns wins

Free, with no sign-up: one click shows the technologies of the site you are on.
It sees what loads in your own browser, including tools a page adds after its scripts run.
Follow a site and get an alert when it starts or stops using a technology.
Its page claims 450k+ active users and 50 to 100 new web apps added every day.

What it costs

No public price; sold by quote

Short answer

WhatRuns is free, needs no sign-up and works one site at a time in your own browser; its site mentions no API, bulk lookup or paid plan. 1Lookup's Tech Stack Lookup costs 1 credit per site that answers, about $0.005 on Starter or $4.95 per 1,000, and reads a whole list by API or CSV. WhatRuns does what 1Lookup does not: it costs nothing and sees what loads after a page's scripts run in your browser.

1lookupvs

WhatRuns shows one site at a time in your browser. 1Lookup reads a whole list by API for $0.005 a site.

The same answer for each site: its CMS, shop platform, analytics, marketing tools, hosting and frameworks, with versions. A site that blocks the check, does not exist or does not answer costs nothing.

1Lookup

$0.005

a site

a site that answers on the $99 Starter plan, down to $0.002 on larger plans

BuiltWith

$0.0495

a lookup

a lookup: $99 for 2,000 API credits, pay-as-you-go

90%

less for every website you look up

Websites you look up a month

20,000

5,000200,000

1Lookup$99 a month
BuiltWith$495 a month
Wappalyzer$450 a month

WhatRuns is a free browser extension with no API or bulk lookup, so it has no bar here: the bars are the two API rivals that print a price.

At 20,000 websites a month, 1Lookup is $396 a month less than BuiltWith: 80% less.

Starter at $99 a month covers up to 20,000 tech stack lookups. A site that blocks the check costs nothing, and credits you do not spend here work on every other 1Lookup lookup.

Start the 7-day free trial

What replaces what

Here is which 1Lookup product matches each WhatRuns job.

WhatRuns is free for the site in your tab. 1Lookup bills one website and its technologies, in credits, only when the site answered with its home page, and nothing for a site that blocks the check, a name that does not exist or a site that does not answer.

The site in your browser tab
Tech Stack Lookup API
A domain, web address or email address in; the technologies the site runs on out, grouped, with versions where the site shows them, detected from its headers, HTML and DNS, plus the email provider from MX. It runs from code or a CSV, not in your browser, so tools a page adds only after its scripts run can be missing.
1 credit per site that answers, free when the site blocks the check, does not exist or does not answer

Side by side

Both products are measured on the same criteria, using WhatRuns's own published numbers.

Criteria	1lookup
Pricing model	Monthly plans with universal credits; core phone, email and IP lookups cost 1 credit, enrichment and intelligence products cost more	A free browser extension, with no sign-up required, that shows the technologies of the site open in the browser, and can follow a site and alert you when it starts or stops using a technology. No paid plan, API or bulk lookup is mentioned on its site.
Starting price	$99/mo for 20,000 credits. At 1 credit each (Tech Stack Lookup API), that is $4.95 per 1,000 tech stack lookups on Starter, down to $2.00 on Enterprise.	Not published; quote-based
Free option	Free single lookups via the online tools at 1lookup.io/tools, no account required	Free: the extension says 'It's free' and 'No sign-up required'.
Free trial	7-day free trial on every plan: $5 of credits on Starter, $20 on Growth, Professional, and Enterprise, with no payment today	None published
Do credits expire?	Unused monthly credits roll over for 3 months; separately purchased credits last 1 year	Not published

How you buy

This is how you buy from 1Lookup and from WhatRuns.

1lookup

How it is sold
Monthly plans with universal credits; core phone, email and IP lookups cost 1 credit, enrichment and intelligence products cost more
What it starts at
$99/mo for 20,000 credits
How you try it
7-day free trial on every plan: $5 of credits on Starter, $20 on Growth, Professional, and Enterprise, with no payment today

How it is sold
A free browser extension, with no sign-up required, that shows the technologies of the site open in the browser, and can follow a site and alert you when it starts or stops using a technology
What it starts at
No public price; sold by quote
How you try it
Free: the extension says 'It's free' and 'No sign-up required'

A real result

This is what one 1Lookup result looks like.

Send a domain
POST a domain, a web address or an email address. It is cut down to the site's host name. An IP address or a private name is refused with a clear error and costs nothing.
We read the home page and DNS at once
1Lookup asks for the home page once and queries MX, TXT, NS and the www CNAME at the same time, with 10 seconds and 2 MB for the page. Internal addresses are refused, redirects included.
Get the stack, flat and grouped
Every technology arrives with its version, group and where it was seen, in one JSON payload. A site that answered bills 1 credit; a blocked or missing site bills nothing.

See the full product page

api.1lookup.io13 technologies

One call turns a domain into the stack its site runs on

Website: sample-shop.example.com
CMS: WordPress 7.2
Shop and payments: WooCommerce 11.4.0, Stripe
Analytics: Google Tag Manager, Google Analytics
Marketing: Klaviyo
Chat: Intercom
Hosting: Cloudflare, Nginx 1.25.3
Frameworks: PHP, MySQL, jQuery 3.7.1
Email provider: Google Workspace

200 OK, 1 creditShow

{
  "classification": {
    "found": true,
    "query": "sample-shop.example.com",
    "technology_count": 13,
    "cms": "WordPress 7.2",
    "ecommerce": "WooCommerce 11.4.0 | Stripe",
    "hosting": "Cloudflare | Nginx 1.25.3",
    "email_provider": "Google Workspace",
    "checked_at": "2026-10-26"
  },
  "metadata": { "credits_used": 1 }
}

Try the Free Tech Stack Checker, one of 1Lookup's free tools.

Run one lookup in your browser and see the result before you decide.

Open the free tool

The evidence

Here is the evidence behind every number on this page.

1Lookup

Source: 1lookup.io homepage, captured August 2026

WhatRuns

Source: whatruns.com homepage, captured October 2026

WhatRuns pricing and product facts verified against whatruns.com as of October 2026. Prices change, so confirm on the vendor’s site. 1Lookup numbers come from the live rate card.

Who it is for

Pick 1Lookup or stay with WhatRuns depending on the job in front of you.

1lookup

Choose 1Lookup if

you need the stacks of a list of websites, not one tab at a time: an API and a CSV upload with one row per site, versions, the email provider from MX, and a price of about half a cent a site that answers.

WhatRuns

Consider WhatRuns instead if

you only want to see the stack of the site open in your browser, for free and with no sign-up, including tools a page loads after its scripts run.

Questions

People ask these questions before they switch from WhatRuns.

Is WhatRuns free?

Yes. Its site says 'It's free' and 'No sign-up required', and names no paid plan. It is a browser extension: it shows the technologies of the site open in your browser, one site at a time. Checked October 2026.

Does WhatRuns have an API or a bulk lookup?

Its site mentions neither. To read the stacks of a list of websites you need an API or a bulk upload, which is what 1Lookup's Tech Stack Lookup is: one call per site, or a CSV with a domain column and one row per site back.

How much does 1Lookup charge for a tech stack lookup?

1 credit per site that answers, free when the site blocks the check, does not exist or does not answer. On the Starter plan ($99 a month for 20,000 credits) a site is about $0.005, which covers 20,000 lookups a month and is $4.95 per 1,000. At the Enterprise end of the rate card it is about $0.002.

Where does WhatRuns beat 1Lookup?

On price and on what a browser sees. WhatRuns is free with no sign-up, and because it runs in your own browser it sees tools a page adds after its scripts run, which a server-side read can miss. It can also follow a site and alert you when it starts or stops using a technology.

When is a 1Lookup tech stack lookup free?

When the site blocks the check, when the name does not exist, when the site has no home page, and when it does not answer in time. Each costs 0 credits. Only a site that answered with its home page is billed.

Can I try 1Lookup's checker for free too?

Yes. The free tech stack checker on 1lookup.io reads one site at a time with no sign-up, a few times a day, and hands off to the full product when you want a list.

What is the best WhatRuns alternative?

For the site in your tab, WhatRuns is free and quick. For a list of sites, a CRM or an app that needs the answer in code, 1Lookup's Tech Stack Lookup reads each site for about $0.005 and charges nothing for a blocked one.

1lookup

Look up a list of websites and see what each runs on

Try 1Lookup free for 7 days and compare it with WhatRuns on your own work.

1 credit a site that answers, about $0.005 on Starter, free when a site blocks the check, on the same balance as phone, email and company lookups. Start with the 7-day free trial.

Start the 7-day free trial See per-lookup pricing

WhatRuns is a free browser extension for the site in your tab, and 1Lookup reads what a whole list of websites runs on, by API or CSV, for $0.005 a site that answers.

Here is where 1Lookup wins against WhatRuns, and where WhatRuns still wins.

WhatRuns shows one site at a time in your browser. 1Lookup reads a whole list by API for $0.005 a site.

Here is which 1Lookup product matches each WhatRuns job.

Tech Stack Lookup API

Both products are measured on the same criteria, using WhatRuns's own published numbers.

This is how you buy from 1Lookup and from WhatRuns.

This is what one 1Lookup result looks like.

Try the Free Tech Stack Checker, one of 1Lookup's free tools.

Here is the evidence behind every number on this page.

Pick 1Lookup or stay with WhatRuns depending on the job in front of you.

People ask these questions before they switch from WhatRuns.

Try 1Lookup free for 7 days and compare it with WhatRuns on your own work.

Keep researching WhatRuns with the matching 1Lookup pages.