Adapt.io vs Interseller: They're Not Really Competitors
These two tools get compared because they both find emails. That's where the similarity ends.
Adapt.io is a B2B sales prospecting platform. Interseller is a recruiting outreach tool that Greenhouse acquired on October 28, 2021, and repositioned as sourcing automation for the Greenhouse CRM. Comparing them is like comparing a sales database to a recruiter sequencing workflow designed to live alongside an ATS. We've used both, and honestly, the comparison barely holds up.
30-Second Verdict
Recruiting team already on Greenhouse? Interseller's sequencing fits naturally into that workflow. Use it.
B2B sales team building prospect lists? Adapt.io is the better fit - though credit limits will frustrate you fast.
Skip both if your actual need is verified B2B emails at scale without credit anxiety. Prospeo covers 300M+ profiles at 98% email accuracy with a free tier, no contracts, and no per-seat pricing.
Side-by-Side Comparison
| Adapt.io | Interseller | |
|---|---|---|
| Primary use | B2B sales prospecting | Recruiting outreach |
| Database | 250M+ contacts | 80% US coverage rate |
| Email accuracy | Not disclosed; mixed G2 feedback | 95% (US) |
| Pricing | Free-$99/mo | $200/user/mo (new users) |
| G2 rating | 4.6/5 (2,789 reviews) | 4.7/5 (210 reviews) |
| Status | Actively developed | G2 profile inactive for over a year |
| Key integrations | CRMs, CSV export | Greenhouse CRM, ATS/CRM sync |
What Happened to Interseller?
Greenhouse acquired Interseller in late 2021, when Greenhouse had surpassed $110M ARR. The plan was to fold Interseller's sourcing automation into the Greenhouse platform - browser plug-in, rules-based campaigns, a unified searchable database across CRM and ATS, plus reporting. All of it was targeted for early 2022.
If you're evaluating this as part of a broader sales engagement platform decision, that context matters.
Here's the thing: the product still exists, but it's drifting. Interseller's G2 profile now displays "This profile hasn't been active for over a year." In March 2024, Interseller moved new customers to a single self-serve Recruiter plan at $200/user/month with 250 lookups per user. An Agency plan starts at $600/month for three users. The legacy $100/month Standard plan? Gone for new signups.
So it's alive, but it's now tightly coupled to Greenhouse recruiting workflows rather than operating as a standalone growth product. If you're not in the Greenhouse ecosystem, there's little reason to consider it.
Adapt.io caps you at 1,000 emails/month on Basic. Interseller charges $200/user just to get started. Prospeo gives you 300M+ profiles with 98% email accuracy, 125M+ verified mobiles, and a 7-day data refresh - at roughly $0.01 per email with no per-seat pricing.
Stop rationing credits. Start building pipeline that actually converts.
Adapt.io at a Glance
The Chrome extension is genuinely useful - G2 reviewers consistently praise it for quick lookups. Pricing is credit-based rather than per-seat, and the 250M+ contact database supports targeting across 3,000+ specialized tech sectors. A free tier lets you test before committing, which we always appreciate.
The downside? Credit limits are one of the most common complaints across those 2,789 G2 reviews, and for good reason. The Basic plan caps at 1,000 email credits and 100 contacts per day, which feels painfully tight once you're running real outbound volume. Reviewers also flag occasional incorrect emails alongside the credit frustration, so you're spending limited credits on data that sometimes doesn't land.
If you're trying to reduce bounces while scaling, pairing any finder with email verification is usually non-negotiable.
Pricing runs from free (25 credits/day) to $49/mo (Starter) to $99/mo (Basic), with custom plans above that. There's also a 7-day free trial with no credit card required.
The Real Differences
These tools serve fundamentally different buyers, and that's the core issue with this comparison.
Interseller was built for recruiters who source candidates, run personalized outreach sequences, and sync activity back to an ATS or CRM. Adapt.io was built for sales teams who need prospect data and enrichment to feed their pipeline. Interseller includes built-in email sequences; Adapt.io doesn't include outreach automation at all, so you'll need a separate tool for sequencing.
If you're building those sequences from scratch, a solid B2B cold email sequence framework will do more than switching tools.
One G2 reviewer described layering Interseller on top of an existing system as "like having two CRMs" - and that friction is real when you're already running a full tech stack. Interseller finds both work and personal emails for candidate outreach, while Adapt.io focuses strictly on business prospecting data.
Let's be honest: if your average deal size is under $15k and you're not recruiting, neither of these tools is worth the overhead. You need verified emails and direct dials, not workflow complexity.
A Better Option for Outbound Sales
If you're a recruiter on Greenhouse, Interseller is already part of your stack. Use it. Don't overthink this.
If you're a B2B sales team, Adapt.io is the more logical choice - but credit limits become a real bottleneck once you're past 50 prospects a day. We ran into this ourselves during a campaign ramp-up, burning through a week's credits by Wednesday.
If you're looking for more ways to keep volume high without tanking performance, these sales prospecting techniques help.
Neither tool fully solves the core problem for outbound sales teams: getting verified contact data at scale without burning credits or locking into per-seat contracts. Prospeo fills that gap with 300M+ profiles, 98% email accuracy, and 125M+ verified mobile numbers with a 30% pickup rate. Data refreshes every 7 days - compared to the industry average of six weeks - so you're not emailing people who changed jobs last month. The free tier gives you 75 verified emails per month, and paid plans work out to roughly $0.01 per email. Native integrations with Salesforce, HubSpot, Smartlead, Instantly, and Clay mean it drops into your existing stack without the "two CRMs" problem.
If you're comparing data providers more broadly, see our breakdown of data enrichment services.
Neither Adapt.io nor Interseller solves the core outbound problem: verified data at scale without credit anxiety. Prospeo's 7-day refresh cycle means you're reaching people at their current company - not where they worked six weeks ago. Teams using Prospeo book 26% more meetings than legacy providers.
Fresh data, real results. No contracts, no sales calls required.
FAQ
Is Interseller still available as a standalone tool?
Yes, but barely. New users can sign up for the $200/user/month Recruiter plan with 250 lookups. The G2 profile has been inactive for over a year, and the product is now tightly coupled to Greenhouse recruiting workflows rather than operating independently. If you're not already in the Greenhouse ecosystem, it's hard to justify.
Can I use Adapt.io for recruiting?
No. It lacks recruiter sequencing, ATS integrations, and personal email sourcing. It's a sales prospecting database - wrong tool for talent acquisition entirely.
What's a good alternative if neither tool fits?
For outbound sales, Prospeo is the strongest option we've found: 300M+ profiles, 98% email accuracy, 125M+ verified mobiles, and a 7-day data refresh cycle. The free tier includes 75 emails/month with no contracts. At roughly $0.01 per email, it's significantly cheaper than both Adapt.io's credit-gated plans and Interseller's $200/user/month pricing. For recruiting specifically, tools like Gem or hireEZ are worth evaluating alongside Interseller.