DomCop vs SpamZilla: Which Finds Cleaner Domains?
This exact question gets asked on every SEO forum where expired domains come up, and it deserves a straighter answer than either fan club gives. Both tools are paid, both filter enormous daily drop lists, and both exist because raw expired domain streams are full of junk. They differ in what they were built to be: one is a spam filter with a database attached, the other is a research platform with spam signals included. The stakes also rose since 2024: with Google treating expired domain abuse as spam, building on a dirty domain went from wasted money to active risk, and filtering quality is the whole reason either subscription exists. Details below are current as of mid-2026.
What each tool is built for
SpamZilla is triage. It processes around 300,000 expired domains a day and boils each one down to an SZ spam score built from anchor text, backlink and redirect analysis, from $37 per month. The pitch is simple: let the score delete 95% of the list for you, then eyeball what survives. It is the cheapest way to add automated spam detection to a bulk workflow, and it makes no auction-house aggregation promises; the product is the score.
DomCop is research. It aggregates expiring, expired, dropped and auction inventory from the major auction houses, attaches Majestic (Trust Flow, Citation Flow, Topical Trust Flow) and Moz (Domain Authority, Spam Score) metrics plus archived screenshots to every row, and layers deep filtering on top. Annual plans start at roughly $68 per month, Guru tiers add 10 to 50 personal crawlers, and a credits system analyzes lists you upload. No free trial; there is a 2-day money-back guarantee.
Head to head
| Aspect | SpamZilla | DomCop |
|---|---|---|
| Entry price | From $37/mo | From roughly $68/mo billed annually |
| Core job | Filtering spam out of bulk expired lists | Finding and vetting domains across aggregated auctions and drops |
| Spam signals | Proprietary SZ score from anchor, backlink and redirect analysis | Moz Spam Score, anchor text views and archived screenshots per listing |
| Daily volume | ~300,000 domains processed | Major auction house streams plus an archive of millions of dropped names |
| Metrics depth | SZ score plus supporting columns | Majestic TF, CF and Topical TF, Moz DA, referring domain data and more |
| Best for | Budget spam triage at volume | Full research and auction buying in one place |
So which finds cleaner domains?
"Cleaner" hides two different jobs. If it means junk removed before I ever look, SpamZilla wins on price: a purpose-built spam score over 300,000 domains a day for $37 is unbeatable triage. If it means confidence that this specific domain is safe to build on, DomCop provides more evidence per row: multi-source authority metrics, the anchor text profile, and archived screenshots that let you replay the domain's past without leaving the listing.
Whichever tool filters your list, apply the same thresholds before money moves: a Majestic TF:CF ratio below roughly 0.3 is a red flag, a Moz Spam Score under 10% is generally treated as clean, and cross-tool authority scores differ by about 26 points on average, so one glowing number proves nothing. And no score replaces opening 5-10 Wayback snapshots yourself; automated scoring is pattern matching, and hand-made junk is built to dodge patterns. Our guide to expired domains and SEO in 2026 covers what happens when dirty domains slip through.
What a clean expired domain looks like
Tools aside, the target is stable: a domain whose history would not embarrass you in front of the person you are building for. In practice that means Wayback snapshots showing one coherent topic and language across the years, no stretches of casino, pharma or replica-goods content, anchor text that reads like a real site earned it, a Moz Spam Score under 10%, and a TF:CF ratio comfortably above the red-flag line. Long parking gaps deserve suspicion too: parked names without real traffic earn their holders only about $3-5 a month, so years of parking usually mean years of neglect rather than hidden value. Both platforms can get you to that shortlist. Neither can excuse skipping the snapshots.
A triage run in practice (illustrative)
Suppose the day's list is 250,000 names and you care about fitness domains with real links. A SpamZilla pass filters on the SZ score and leaves a few hundred survivors: fast, cheap, done before coffee. Now the DomCop half of the story: the same few hundred names, viewed there, arrive with Trust Flow, Topical Trust Flow in the fitness category, referring domain counts and archived screenshots on each row, plus whichever names are sitting in live auctions and closeouts right now. Triage answered "what can I ignore?"; research answers "what is this one worth bidding on?". They are sequential questions, which is why the both-tools workflow keeps showing up in forum threads.
Verdict by buyer type
Prices as of mid-2026; both vendors adjust plans occasionally, so verify before subscribing.
- Processing huge lists on a budget: SpamZilla. The SZ score per dollar is the whole product, and it is good at its one job.
- Buying at auctions regularly: DomCop, because aggregation plus metrics means research and bidding happen in one place.
- One high-stakes rebuild: DomCop for evidence depth, then manual Wayback and anchor review regardless of what any score says.
- Complete beginner: neither yet. Learn on the free ExpiredDomains.net tier first, then pay for the bottleneck you actually hit.
- Power users: plenty run both: SpamZilla to shrink the firehose, DomCop to qualify and buy. Our 2026 tool rankings show where each sits in the wider field.
Frequently asked questions
Is the SZ spam score reliable?
It is a strong first-pass filter, not a verdict. Automated scores catch pattern-based spam well, but they can flag clean domains with odd histories and miss manual spam designed to look natural, which is why serious buys still get a human Wayback and anchor text review.
Does DomCop detect spam too?
Yes, differently. It surfaces Moz Spam Score, anchor text data and archived screenshots on each listing, giving you the raw evidence to judge cleanliness yourself rather than a single proprietary number.
Which is cheaper overall?
SpamZilla at $37 per month versus DomCop from roughly $68 per month billed annually. Whether the gap matters depends on volume: for frequent auction buyers, DomCop's aggregation typically saves enough hours to cover the difference.
Can I try either tool free?
DomCop has no free trial; its 2-day money-back guarantee is the effective test window. SpamZilla's entry plan is the cheaper commitment if you just want to experiment with automated spam scoring. Running both comes to about $105 per month, still less than one bad auction win.
Which tool is better for building a PBN?
Neither changes the math. Networks built on expired domains carry deindexing risk from shared footprints, and Google has treated expired domain abuse as spam since March 2024. If you accept those risks anyway, spam triage matters most, but read the policy before the pricing pages.
Sources
- SpamZilla (pricing, SZ score, daily volume)
- DomCop pricing guide
- DomCop: anchor text analysis
- ExpiredDomains.net (the free baseline)
- Google Search: spam policies