Hunter vs Ontolo in 2026: Contact-finding and outreach platform vs large-scale prospect discovery engine
Hunter finds and verifies emails at a domain you already know, then automates the outreach. Ontolo does the opposite job: it discovers thousands of prospect sites you did not know about across 80+ sources, with no public pricing and no outreach tools of its own.
Hunter
Ontolo- Hunter requires a known company domain to return contacts. Ontolo works the opposite way, discovering prospect websites you did not already have by expanding a search term into 20+ query variations across 80+ sources.
- Hunter has a free plan with 600 credits per month and no credit card required. Ontolo publishes no pricing at all; evaluating cost requires contacting the company directly.
- Ontolo processes 250,000 prospects per minute with sub-second search across the resulting database, a scale claim Hunter does not make since it looks up one domain or person at a time.
- Hunter includes a full cold email Sequences tool that sends from your own Gmail or Outlook account. Ontolo has no outreach or link-tracking features; its output is a multi-tab Excel file meant for handoff to a separate tool.
- Hunter integrates natively with HubSpot, Salesforce, Pipedrive, and Zoho CRM on Growth plans and above, plus Zapier and a documented API. Ontolo has no native CRM or outreach-tool integration, only CSV and Excel exports.
- Ontolo's categorization distinguishes keywords in article body content from navigation or footer placement, and separates a site's own social accounts from ones linked within an article. Hunter does not attempt this kind of on-page content classification.
- Ontolo's own related-tools list names Hunter as a complementary outreach tool, not a competitor, which matches how the two products actually get used together in practice.
Hunter and Ontolo get lumped together as link building tools, but they solve two different stages of the same workflow. Hunter is built around a domain you already have in mind: paste it in, get verified contacts, then run a cold email sequence from your own inbox. Ontolo is built around a domain you do not have yet: give it a prospect type like "guest post" and it expands that into 20+ query variations, crawls 80+ sources at 250,000 prospects per minute, and hands back a categorized Excel file. Hunter has a free plan, transparent per-tier pricing, and unlimited team members. Ontolo has no public pricing page at all and an interface that still shows its 2008 origins. Which one you need depends on whether your bottleneck is finding target sites in the first place or getting a verified email address once you have them.
The tools at a glance
Hunter
Find and connect with the people that matter to your business.
Hunter starts from a domain: paste in a company website and Domain Search returns verified professional email addresses for people who work there, each with a confidence score and, where available, a LinkedIn profile. This is the fast path to an editor or webmaster contact once you already know which site you want to pitch, which is most of the time for link builders working from a target list.
Once you have contacts, Sequences handles the outreach itself: multi-step email campaigns, scheduled follow-ups, subject-line A/B testing, and open/click/reply tracking, all sent from your own connected Gmail or Outlook account rather than shared sending infrastructure. Bulk verification cleans large lists before a campaign goes out, and a Discover feature adds general B2B lead search on top.
What Hunter does not do is discover new prospect sites for you. It assumes you already know the domain, whether that came from a competitor backlink check, a manual list, or your own research. For pure prospect discovery at scale, that is Ontolo's job, not Hunter's.
| Feature | Free €0/month | Starter €34/month | Growth €104/month | Scale €209/month | Enterprise Custom |
|---|---|---|---|---|---|
| Credits per year | 600 | 24,000 | 120,000 | 300,000 | Custom |
| Recipients per sequence | 500 | 2,500 | 5,000 | 15,000 | Custom |
| CRM integrations | No | No | Yes | Yes | Yes |
| Team members | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited |
Ontolo
Deep link prospecting engine that discovers and categorizes prospects from 80+ sources at 250,000 prospects per minute
Ontolo exists for one job: finding prospect websites you do not already have on a list. Enter a prospect type like "guest post" and it automatically expands that into 20+ related query variations ("write for us," "guest author," "contribute") and searches more than 80 sources simultaneously, which surfaces far more candidates than manually running the same searches yourself one at a time.
The categorization is the part that sets it apart from a plain search scraper. Ontolo distinguishes keywords appearing in actual article content from ones sitting in navigation, footers, or comments, and separates a site's own social accounts (linked in the nav) from social links that appear inside an article. That filtering matters because it cuts the number of false-positive prospects you have to manually reject before outreach.
The trade-offs are real. There is no public pricing page, so you cannot compare cost against Hunter or any other tool without contacting Ontolo directly. The interface reflects a product that has been running since 2008, and there is no CRM, Zapier, or modern outreach integration; you get a categorized multi-tab Excel export and take it from there in a separate tool.
| Feature | Plans Contact for pricing |
|---|---|
| Prospecting sources | 80+ |
| Processing speed | 250,000 prospects/minute |
| Query expansion | 20+ variations per prospect type |
| External list upload (Ahrefs, Moz, Majestic) | Yes |
Head-to-head feature comparison
| Feature | Hunter | Ontolo |
|---|---|---|
| Core function | Email finding, verification, and cold email outreach | Large-scale link prospect discovery and categorization |
| Prospecting sources / discovery method | None natively; requires you already know the target domain | 80+ sources crawled simultaneously |
| Contact and email verification | Confidence scoring plus automated verification | Not a verification tool; contact data pulled from crawled sites |
| Automatic query expansion | No | Yes (20+ query variations per prospect type) |
| Outreach automation (sequences/campaigns) | Yes (Sequences: multi-step campaigns, follow-ups, A/B testing) | No (prospecting and research only) |
| Native CRM integrations | Yes (HubSpot, Salesforce, Pipedrive, Zoho on Growth plan and above) | No native CRM integration |
| API access | Yes (documented REST API) | Not listed as a feature |
| Data export format | CSV export, CRM sync, Zapier (5,000+ apps) | Multi-tab, color-coded Excel exports; CSV/text upload of external lists |
| Team members | Unlimited on every plan | Not specified |
| Free tier | Yes (600 credits/month, no credit card) | No public free tier |
| Pricing model | Credit-based tiers | Custom, contact-based pricing |
| Starting price | €0/month (Free) | Contact for pricing |
Which should you choose?
HunterOntoloHunterOntoloHunterOntoloHunterThese two are less rivals than adjacent stages of the same pipeline. Ontolo answers "which sites should I even be pitching," pulling from 80+ sources and 20+ query variations to build a prospect database at a scale a person cannot replicate manually. Hunter answers "who do I email at the site I already picked," then runs the actual campaign. A team with no shortage of target sites but slow contact-finding should skip Ontolo entirely. A team drowning in Domain Search lookups but short on fresh prospect ideas is the one Ontolo is built for, and it will still need Hunter, BuzzStream, or a similar tool afterward to actually send anything.
Bottom line
Start with Hunter. It covers contact-finding and outreach in one place, has a real free tier, and publishes its pricing, which makes it the lower-risk choice for most link building teams. Add Ontolo specifically when prospect discovery itself becomes the bottleneck, meaning you have outreach capacity to spare but keep running out of sites worth pitching; just budget time to request pricing and get past the dated interface, and plan to export into Hunter or another outreach tool afterward since Ontolo will not send a single email for you.
Frequently asked questions
Does Hunter or Ontolo find new websites to pitch, or just contacts at sites I already know?
Ontolo is the one built to find new websites. It expands a prospect type like "guest post" into 20+ query variations and crawls 80+ sources to surface sites you have not found yet. Hunter works from a domain you already have and returns verified contacts at that site; it does not search the web for new prospect candidates the way Ontolo does.
Why doesn't Ontolo publish its pricing anywhere?
Ontolo has no public pricing page and requires direct contact or registration to get a quote, which is stated plainly as a drawback in its own feature comparison. This is common among older B2B tools sold through a sales conversation rather than self-serve signup, but it does mean you cannot compare Ontolo's cost against Hunter's published €34-€209 monthly tiers without reaching out first.
Can I use Ontolo's prospect list with Hunter's outreach Sequences?
Feeding Ontolo's prospect list into Hunter's Sequences is effectively the intended workflow between these two tools. Ontolo exports prospects as multi-tab, color-coded Excel files with contact information, email addresses, and social accounts already organized, which you can then feed into Hunter for email verification and Sequences-based outreach. Ontolo's own related-tools list names Hunter as a complementary tool rather than a competitor, which reflects how the two are typically used together.
Is Ontolo's interface really as dated as reviews say?
Ontolo's interface genuinely does reflect its 2008 origins, and the company's own footer references activity through 2016. The prospecting and categorization engine underneath still works and is genuinely deep, but buyers used to modern SaaS interfaces should expect a learning curve and an older visual style, not a redesigned dashboard.
Which tool is better for a small link building team just getting started?
Hunter is the better starting point for a small team. It has a genuine free plan with 600 credits and no credit card required, a modern interface, and outreach automation built in, so a small team can find contacts and start sending in the same afternoon. Ontolo's prospecting depth matters more once discovery becomes the actual bottleneck, which tends to happen after a team has already run through the easier, more obvious prospect lists.
Does either tool verify email deliverability before sending?
Hunter does, with a dedicated Email Verifier that checks deliverability and flags disposable or catch-all addresses, plus bulk verification for cleaning large lists before a campaign. Ontolo is not built as a verification tool; the email addresses in its Excel exports come from crawling prospect sites, so running them through a verifier like Hunter's before sending is a reasonable extra step.