FrogDR alternatives

Six ways to watch a domain rating without FrogDR. Domduck is one of them and it is not first, because it is not the right answer for every reason somebody leaves.

Everything measured here was read on 2026-08-03. Where a claim is not dated, it is not measured, and it says so.

First, what you are replacing

FrogDR does one job well: it reads Ahrefs' free Domain Rating for your domains on a schedule and shows the line. Free covers 6 domains, $5 a month covers 12, and the paid plan adds backlinks, referring domains, a leaderboard and a public directory. Measured on frogdr.com/pricing, 2026-08-03.

People leave for one of four reasons, and the right replacement depends on which:

1. The cap. 12 domains is not enough.
2. The gap. Their free-plan footnote says collection may stop after 10 days without a visit.
3. The scope. The rating is one number, and the certificate, the registration date and the AI crawler policy are not in it.
4. The price of the thing above it. Real backlink data is an Ahrefs subscription, not a $5 tracker.

1. Ahrefs Webmaster Tools

The rating comes from Ahrefs, so the most accurate free view of it is Ahrefs' own. Webmaster Tools is free for sites you can verify, and it gives backlinks, a site audit and keyword data that no free tracker has.

Where it stops. You must prove you own the site, so you cannot watch a competitor, a client's domain or a portfolio you are only considering. It also shows you today. There is no long rating history to replay.

Take it if you have one or two sites, you own them, and you want depth rather than breadth.

2. Moz Link Explorer and Moz Pro

A different metric with the same shape. Domain Authority is Moz's score, not Ahrefs', and the two do not convert into each other.

Where it stops. Moz caps historic Domain Authority at one year. For a metric whose whole value is the trend, that is a real limit and it is published in their own documentation rather than hidden.

Take it if your reporting already speaks Domain Authority.

3. Semrush Authority Score

Third metric, third vendor, same caution. It is a paid product and the free view is a teaser.

Take it if you already pay for Semrush. Do not buy it to replace a $5 tracker.

4. The free rating checkers

There are dozens: single-page sites with a box, a button and a number. They read the same free Ahrefs endpoint everything else reads.

Where they stop. They are stateless. Ask twice and you get today's number twice, with no record that yesterday was different. Most of them advertise that they need no key, and that stops being true on 2026-08-10, when Ahrefs starts requiring one on the free endpoint they all read.

Take one if you need a single number once and you do not care about the trend.

5. Domain monitoring tools

Expirity, domain-monitor.io, thedomaintracker.com, Domainyze and the self-hosted domain-monitor project all watch registration and certificate expiry. Several are good at it.

Where they stop. None of them carries an authority metric. That is the split across this whole market: the domain monitors do not know about SEO, and the SEO tools do not know your certificate expires on Thursday.

Take one if expiry alerts are the actual job and the rating was incidental.

6. Domduck

Unlimited domains on the free tier, one reading a day, and the rating beside the rest of the public record: AI crawler policy for 8 agents with the date each verdict changed, llms.txt, RDAP registration, certificate expiry and issuer, DNS, and the Tranco popularity rank. There is an MCP server for agents and a public HTTP API. No account is needed to look up one domain.

Where it stops. No backlink data, no referring domains, no keyword data, one reading a day rather than four, and no leaderboard. Rating history starts the day you add a domain, because the source publishes only today's value. Domduck is younger than FrogDR and has less collected history.

Take it if you run more domains than a cap allows, or you want the record to keep running while you are not looking.

The one thing to do before you switch

History cannot be backfilled by anyone, on any of these products. Whatever you choose, start it today rather than on the day you need the chart, and keep the old account running until the new series is long enough to be useful.

Method

Claims about FrogDR were read from their live pages on 2026-08-03. Claims about the other products come from their own published documentation and are not re-measured on this page, which is why none of them carries a price here. Prices move and an undated price is worse than no price.

Domduck publishes this list, so read the last entry with that in mind. It is sixth because the first five are better answers to reasons 1, 3 and 4 above. See what Domduck records and decide from the source list rather than from this paragraph.