ContactOut vs Mailarrow: You're Comparing a Data Tool to a Sending Tool
One finds contact data. The other sends cold emails. The ContactOut vs Mailarrow question isn't a real comparison - it's like putting a fishing rod next to an oven because both are involved in getting dinner on the table. Here's what each one does, what's missing from both, and where your money should actually go.
30-Second Verdict
Pick ContactOut if you need emails and phone numbers - especially personal emails for recruiting, where you can't blast a work inbox.
Pick Mailarrow if you already have a contact list and need a cold email sender with warmup and inbox rotation.
Skip both if stale data is destroying your deliverability. Verify and enrich your list before you send anything - bad data tanks sequences regardless of which sender you use.
What Each Tool Actually Does
These tools sit at different stages of the outbound workflow. Comparing them feature-for-feature misses the point entirely.
ContactOut
ContactOut is a contact data finder. It pulls emails (personal and work) and phone numbers from professional profiles via a Chrome extension, plus a search portal for prospecting across its database. Its sweet spot is recruiting - Reddit threads specifically call out its personal email hit rate for poaching candidates without alerting their current employer. On G2, the platform lands in Recruiting Automation and Sales Intelligence categories, which tells you about the audience it attracts.
Mailarrow
Mailarrow is a cold email sending platform. It handles email warmup, smart inbox rotation, sequence building with follow-ups, and campaign analytics - higher tiers add AI-powered personalization. It doesn't find contacts. You bring your own list. Think of it as competing with Instantly, Smartlead, and Lemlist, not with data providers.
Here's the thing about Mailarrow: it has almost no third-party reviews. In a Reddit thread where practitioners ranked their top cold email platforms - Smartreach.io, Lemlist, Apollo, Instantly.ai, Reply, Saleshandy - Mailarrow didn't make the list. That's a thin social proof footprint for a tool handling your sender reputation.
ContactOut finds contacts. Mailarrow sends emails. Neither verifies what's in between. Prospeo's 5-step verification and 7-day data refresh cycle close that gap - 98% email accuracy at ~$0.01/email, so your sequences hit real inboxes instead of torching your domain.
Stop feeding stale data into your sending tool.
Pricing and Plan Limits
ContactOut's pricing page failed to render plan details on multiple attempts during our testing. Here's what we've confirmed from third-party sources and the numbers that do surface.
| Tool | Plans | Starting Price | Key Limits | Transparency |
|---|---|---|---|---|
| ContactOut | Free / Email / Email+Phone / Recruiter / Team | $49/mo (annual) | 300-600 exports/mo | Poor |
| Mailarrow | Free / Basic / Professional / Growth | $0 (free tier) | 100 emails (Free) to 150K (Growth) | Clear |
ContactOut's real constraint is exports, not lookups. The Email plan runs $49/mo on annual billing with roughly 2,000 email lookups but only 300 exports per month - about $0.16 per usable contact. Other pricing guides list the Sales/Email plan at $79/month. Either way, the export cap determines your true cost per contact.
Email+Phone at $99/mo bumps exports to 600, with roughly 2,000 email lookups and 1,000 phone lookups - still about $0.165 each. The Recruiter plan costs $199/mo. Team/API pricing is quote-based and often lands around $2,000-$4,000/year per license, with no pooled credits across seats.
Mailarrow keeps it simpler. Basic at $39/mo gets you 2,000 active prospects and 6,000 emails. Professional at $59/mo jumps to 20,000 prospects and 60,000 emails plus AI personalization. Growth at $99/mo covers 50,000 prospects and 150,000 emails. All tiers include unlimited warmup and unlimited mailboxes, with a 7-day free trial available.
Deliverability and Data Quality
Stop comparing tools by feature checklists. Compare them by which failure mode they prevent.
ContactOut carries reputation risk. Its Trustpilot score sits at 1.4 out of 5 across 115 reviews, with recurring complaints about privacy concerns, difficulty removing personal data, and a pattern of not replying to negative reviews. Some users also report that connecting email for outreach led to messages getting labeled as spam.
Mailarrow's risk is different. User complaints mention laggy delivery and emails landing in spam folders despite warmup. Warmup builds sender reputation, but it can't fix the underlying data problem.
The tool you pick for data matters more than the tool you pick for sending. A 2026 Dropcontact benchmark of 20,000 lookups across 15 email finders found hard bounce rates ranging from 0.9% to 11.2%. That's a 12x gap between the best and worst data providers. Meanwhile, most cold email senders perform within a narrow band of each other once your data is clean.
The decay numbers back this up. Around 70.8% of business contacts experience at least one data change within 12 months, and roughly 23% of any email list degrades within a single year. No amount of inbox rotation compensates for a list full of dead addresses.
Verify Before You Send
What does clean data actually do in practice? Snyk cut bounce rates from 35-40% to under 5% and saw AE-sourced pipeline climb 180% after switching their data source. Stack Optimize maintains 94%+ deliverability with sub-3% bounce rates across every client campaign. The gap between "good enough" data and verified data is the gap between sequences that book meetings and sequences that torch your domain.
At $0.16 per ContactOut export, a 1,000-contact list costs $160 - with no guarantee those emails still work. Prospeo covers the same list for ~$10 with 98% accuracy, 300M+ profiles, and a free tier of 75 verified emails per month. No contracts, no sales calls.
Pay 16x less per contact and bounce less than 2%.
FAQ
Do I need both ContactOut and Mailarrow?
They solve different problems - data finding versus email sending. Most outbound teams need three layers: a data source, a verification step, and a sender. ContactOut gives you contacts. Mailarrow sends sequences. Neither verifies data quality in between. Prospeo fills that verification gap at roughly $0.01/email with 98% accuracy.
Does warmup prevent spam?
Warmup builds sender reputation, but it can't fix bad data. If your list has stale or invalid addresses, bounces will tank deliverability regardless of how long you warmed up. Prioritize data quality first, warmup second, sending third.
Is there a tool that handles both prospecting and sending?
Apollo combines prospecting and outbound workflows in one platform, and Instantly is commonly used for sending. For best results, pair a dedicated data platform for verified contacts with a dedicated sender. Let's be honest - specialization beats all-in-one when deliverability is on the line.
What's a cheaper alternative to ContactOut for finding emails?
Prospeo offers 300M+ professional profiles with 98% email accuracy at roughly $0.01 per email - compared to ContactOut's ~$0.16 per export. The free tier includes 75 emails per month with full verification, which makes it a stronger starting point for teams running real outbound campaigns.