This page explains where the two overlap, where they differ, and when to use which. We keep it factual. We do not quote NameBio's prices or database size, because those change and we have not verified them today. Check their site for current pricing.
What NameBio is good at
NameBio collects reported domain sales and lets you search them by keyword, extension, price, date and venue. For many investors it is the first place to look up what a name or a keyword has sold for. If you know what you are looking for and you are comfortable judging comps yourself, a keyword search across a large sales history is fast and useful.
It is also a source that much of the industry relies on. NameBio's top sales charts are republished in the public NamePros "Daily Domain Sales" reports, and those reports are where our own corpus comes from. So there is no point pretending the two are unrelated. Our data stands on the same public reporting.
Where our corpus comes from
SoldComparables holds 128,867 recorded domain sales between 2021-05-28 and 2026-05-28. Every sale comes from a public NamePros "Daily Domain Sales" report, which republishes NameBio top sales charts. Each sale shows its venue (GoDaddy, Sedo, DropCatch, Afternic, Atom, Namecheap, NameJet, BuyDomains, Dynadot, Spaceship and others) and a link to the public report thread it came from. We do not invent sales.
Two consequences follow, and you should know them before you choose.
- Our floor is 1,000 USD, because that is the floor of the public reports. Sales below that are not in our corpus.
- Our corpus is a subset of reported sales, not a larger one. If you need the widest possible list of reported sales, a dedicated sales database is the right tool.
What SoldComparables adds
The work a keyword database leaves to you is the judgment: which sales are actually comparable, and what they mean for the name in front of you. That is the part we automate and show.
Semantic similarity instead of keyword matching
Every sold name is split into words, and an embedding language model has precomputed which words are close in meaning. "cron" sits near "scheduler", "task" and "job". So a search for a developer-term .ai name finds sales of other developer terms, such as workflow.ai at 35,000 USD on Park.io (2023-01-07) or kernel.ai at 14,599 USD on Dynadot (2024-10-08), even when no letters overlap. A keyword search would need you to think of each of those words yourself.
A relevance score with reasons
Each comp gets a score from 0 to 100 and up to three plain reasons, such as "Same .ai extension", "Shares the word cron" or "Same length". You see why a sale ranks where it does, and you can remove one you disagree with.
An estimate that shows its work
The estimate gives a low, likely and high value in USD, a wholesale figure and a retail figure, a confidence level, and a rationale that cites the comps by name, price and date. It also says what would raise or lower the number. When fewer than three good comps exist, it says so, widens the range and lowers confidence. When no comparable recorded sale exists above 1,000 USD, it says names like this usually trade below that and does not invent a figure. It is a data-backed estimate, not a certified appraisal.
Reports and bulk
Paid plans export a report to PDF and CSV. Investor adds bulk lists of up to 200 names and a portfolio view; Broker adds lists of up to 1,000 names, white label PDFs with your logo and a REST API.
Side by side
| NameBio | SoldComparables | |
|---|---|---|
| Main job | Search reported sales | Find scored comps and estimate a value |
| Search method | Keyword and filters | Semantic similarity plus filters |
| Data | Large database of reported sales | 128,867 recorded sales from public reports, 2021 to 2026, each at least 1,000 USD |
| Source links | Check their site | Link to the public report for every sale |
| Relevance scoring | You judge each comp | Score 0 to 100 with up to 3 reasons |
| Value estimate | Not its focus | Low, likely, high, wholesale and retail, confidence, rationale |
| Reports | Check their site | PDF and CSV; white label PDF on Broker |
| Bulk and API | Check their site | Bulk from Investor, API on Broker |
| Pricing | Check their site for current pricing | From 49 USD per month, 24 USD per month billed yearly |
When to use which
Use NameBio when you want to browse sales history broadly, look up a specific keyword across years, check sales below 1,000 USD, or research a niche where you already know which names to compare.
Use SoldComparables when you need an answer for one name, or a list of names, quickly: which sales are really comparable, what range they support, and a document you can send. That is the case before an expired auction closes, when you set buy now prices across a portfolio, or when a buyer asks you to justify a number. See domain investing tools and domain broker tools for those workflows.
Use both when the stakes are high. Start with our scored domain comps and estimate, then check the keyword history on NameBio for anything the semantic search might not treat as similar. Two views of the same public market are better than one.
Wholesale and retail in the comps
One thing a raw sales list does not do for you is separate markets. Every comp in SoldComparables carries a venue tier: expired auction or investor venue, end-user marketplace, or mixed venue. In our corpus the wholesale median is 1,725 USD across 30,021 sales, the retail median is 2,288 USD across 23,816 sales, and the average retail sale is 6,437 USD against 3,312 USD wholesale. The same name can land in both: zip.ai sold for 1,610 USD on Park.io (2021-08-10) and for 200,000 USD on Afternic (2025-03-27). The estimate keeps those figures apart.
How SoldComparables fits your workflow
Anyone can run one search per day without an account and see three comps plus the estimate range. After signing up you get one one-time full report with all comps, the estimate, the rationale and a PDF marked "Preview". There is no free plan. Paid plans start at Pro, 49 USD per month or 24 USD per month billed yearly, with 150 searches and 10 saved reports per month. Searches are private to your workspace and never used to buy names.
Run a name through the domain appraisal tool, or compare plans on the pricing page.