If you source links from both linkhouse.co and serpzilla.com, one number decides how much you overwrite yourself: how much do their site databases overlap? We matched both catalogs on the normalized domain (lowercased, no scheme or www) inside our Backlink Pricing dataset.
The overlap
The two databases share 33,090 domains — 38% of linkhouse.co and 24% of serpzilla.com. As a Jaccard index (shared ÷ combined) the catalogs are 17% identical, so about 83% of the combined pool is exclusive to one side.
Unique inventory
- 53,694 domains on linkhouse.co only (62% of its catalog).
- 103,847 domains on serpzilla.com only (76% of its catalog).
Where they overlap, who's cheaper?
For the 33,090 shared domains priced on both platforms, comparing the cheapest listing on each:
On identical inventory, linkhouse.co is the cheaper source 60% of the time (median $120 vs $158 for the same sites). The average absolute price gap per shared domain is $161 — always price-check a placement across platforms before buying.
Quality (Domain Rating)
| DR band | On both | linkhouse.co only | serpzilla.com only |
|---|---|---|---|
| DR 80–100 | 0% | 1% | 1% |
| DR 60–79 | 5% | 3% | 3% |
| DR 40–59 | 23% | 11% | 11% |
| DR 20–39 | 33% | 26% | 25% |
| DR 0–19 | 39% | 60% | 59% |
Median DR: 27 shared, 13 linkhouse.co-exclusive, 13 serpzilla.com-exclusive.
Geography
| # | linkhouse.co | domains | serpzilla.com | domains |
|---|---|---|---|---|
| 1 | Poland | 24,865 | United States | 15,216 |
| 2 | United States | 8,133 | France | 6,569 |
| 3 | France | 4,501 | India | 5,343 |
| 4 | Germany | 4,165 | Russia | 5,306 |
| 5 | India | 2,895 | Germany | 4,079 |
| 6 | Netherlands | 2,555 | Italy | 3,122 |
FAQ
Does "on both" mean the same seller?
Not necessarily — a domain can be listed on both marketplaces by the same publisher or different resellers. What's shared is the placement opportunity, which is what you dedupe before buying.
Is a bigger database always better?
No. Overlap, price spread, DR/traffic quality and geography decide value for a specific campaign. Comparing databases is how you buy the same link for less and find inventory a single platform can't offer.