Dev tools · alternatives · 2026

24 alternatives to Domainduck

A domain API for pricing, WHOIS, availability and more.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier.

1
Notify.domainsfree tier, from $2/mo▲322
Know the moment a domain opportunity appears
Aug 2026 · notify.domains · its alternatives →
2
Domainz.io▲282
Premium domains, for not so premium prices
2018 · taixiuonline68.net · its alternatives →
3
Domain WHOIS API▲3
Free domain lookup — RDAP, no API key needed
Aug 2026 · rapidapi.com · its alternatives →
4IC
I crossed a thesaurus with a domain availability checking API▲113
2013 · domainmasher.com · its alternatives →
5
DomainWatch▲352
Domain Monitoring Made Easy
2018 · webmaster.ninja · its alternatives →
6
tldx▲109
Fast CLI to bulk-check domains via RDAP & MCP
May 2026 · github.com · its alternatives →
7
DomainDetails.com - Free & Private WHOIS▲26
Free & Private domain research - right in your browser
Dec 2025 · domaindetails.com · its alternatives →
8
Namecheap Auctions▲131
200,000+ active no reserve premium domain auctions live now
2021 · namecheap.com · its alternatives →
9
StakeWeb▲328
Earn money from your unused domains
2024 · its alternatives →
10
Free Domain Tool▲14
Domain availability checker
2025 · domainaide.com · its alternatives →
11NF
NameMonk – fast domain search using web sockets and Bloom filters▲85
2013 · namemonk.com · its alternatives →
12
Domain Tracker▲174
Simple, privacy-friendly & self-hosted domain tracker
2021 · its alternatives →
13
Domain Availability Checker▲78
Check domain and compare prices of best registrars
2022 · goonlinetools.com · its alternatives →
14
Whois³▲80
Know about everyone in web3
2022 · its alternatives →
15
NameGrab.io▲129
Hand-picked brandable domains delivered daily
2022 · its alternatives →
16
Whoisology▲106
Find Connections Between Domain Names & Their Owners
2014 · whoisology.com · its alternatives →
17
Buy.io▲67
A new way to sell & buy domain names.
2018 · its alternatives →
18
CheckDuck▲8
Expired Domain Analysis Tool
2019 · its alternatives →
19
DotComBuddy – Generate and check domains with AI in one go▲8
I tend to use AI to brainstorm domain names, but I kept wasting time pasting each idea into Namecheap to see if they were available. So I built DotComBuddy - it generates ideas (using DeepSeek V3 - switched from GPT-4o after realizing quality was just as good) and checks availability in real time via Name.com’s API. Built with Next.js and Vercel’s AI SDK, the app gives you a table of available domains with their price. 10 free searches to try it out, then $9/year (what I’d pay to never do this manually again). Sharing this for anyone else tired of switching tabs to check domains. Happy…
2025 · dotcombuddy.com · its alternatives →
20
NS6.com▲71
Register domains across 800+ extensions with free WHOIS privacy, free DNS and free SSL on every domain. Search, transfer in, and manage everything in one place.
2022 · ns6.com · its alternatives →
21
HealthCheck Bot▲75
Simple bot helps to check all your domains every minute
2021 · t.me · its alternatives →
22
takenorfree.com▲6
Domain availability checks for humans and AI agents.
Jun 2026 · takenorfree.com · its alternatives →
23
API Portfolio — 5 Free APIs▲8
5 free dev APIs: WHOIS, Company, Email, Geo, Sanctions
Jul 2026 · on13uka.github.io · its alternatives →
24
WHOIS_OS▲6
Domain, nameserver lookup & IP tools
2023 · whoisos.com · its alternatives →

Also compare

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →