ContactOut vs Sendster: Different Tools (Here's What to Use)
The answer here is simpler than you'd expect: these tools don't do the same thing. ContactOut finds contact data - emails and phone numbers. Sendster is self-hosted email marketing software you install on your own hosting and connect to your SMTP provider (including Amazon SES). Comparing them is like comparing a phone book to a mailroom.
30-Second Verdict
- Use ContactOut if you need to find B2B emails and phone numbers for outreach lists.
- Use Sendster if you already have a list and need a self-hosted platform to send campaigns cheaply.
- Skip both if you need verified B2B contact data at scale with high accuracy - Prospeo covers 300M+ profiles with 98% email accuracy, refreshed every 7 days, at roughly $0.01/email.
They solve different halves of the same workflow: finding people, then reaching them.
What Each Tool Actually Does
ContactOut is a contact data platform. You use its Chrome extension or search portal to look up professional emails and phone numbers, then export those contacts for outreach. It competes with Apollo, Lusha, and RocketReach.
Sendster is self-hosted email marketing software. You install it on your server, connect Amazon SES or any SMTP provider, and send newsletters, drip sequences, or automated campaigns. It competes with Mailchimp, ConvertKit, and Sendy.
The confusion comes from the word "email" appearing in both product descriptions. One finds emails. The other sends them.
Side-by-Side Comparison
| ContactOut | Sendster | |
|---|---|---|
| Category | B2B contact data | Email marketing/sending |
| Pricing | $99-$199/mo | $67-$127/yr |
| G2 Rating | 4.4/5 | 4.0/5 (1 review) |
| Finds emails? | Yes | No |
| Sends campaigns? | Yes (included, but not the core value) | Yes - core function |
| Best for | Building prospect lists | Sending to existing lists |
ContactOut's "unlimited" emails hit a wall around 2,000/month. Prospeo gives you 300M+ verified profiles with 98% email accuracy, 30+ search filters, and data refreshed every 7 days - not every 6 weeks. At roughly $0.01/email, you get cleaner lists without the fair-use guessing game.
Find verified emails at scale without hitting invisible limits.
ContactOut in Practice
ContactOut's self-serve tiers break down roughly like this:
- Free: 5 emails, 5 phone numbers, 5 exports/day
- Email ($99/mo): "Unlimited" emails, 300 exports/month
- Email+Phone ($199/mo): "Unlimited" emails and phone numbers, 600 exports/month
- Team/API: Contact sales
Here's the thing - "unlimited" comes with fair-use limits. Expect roughly 2,000 emails/month and around 91 email lookups/day on those plans before you hit the practical ceiling. We've seen this pattern across a lot of "unlimited" data tools, and it's worth testing before you commit to a paid tier.
The bigger issues: email accuracy can be inconsistent for smaller companies, phone coverage outside North America has real gaps, and outreach sequences can keep running even after replies or bounces - a complaint that shows up repeatedly in ContactOut alternatives discussions. ContactOut does include email campaigns, but it's not a replacement for a dedicated sending platform.
Sendster in Practice
Sendster takes a completely different approach. You buy a license, install it on your hosting, and connect your own email infrastructure:
- Elite ($67/yr): 1 site, 50,000 subscribers, 10 SMTPs
- Pro ($97/yr): 5 sites, unlimited subscribers, unlimited SMTPs
- Pro Extra ($127/yr): 30 sites, unlimited subscribers, unlimited SMTPs
That's cheap because you're paying for the software, not the sending. Your actual email costs come from Amazon SES or whatever SMTP you connect - Sendster's site highlights sending 10,000 emails via SES for about $1. Features include automation via triggers and webhooks, a WYSIWYG designer, built-in email verification for list hygiene, subject line and content spinning, lead forms, and Zapier integration.
One caveat: Sendster has virtually no Reddit discussion and exactly one G2 review. That's not necessarily a dealbreaker for a self-hosted tool with a small user base, but you're relying heavily on the vendor's own documentation for due diligence. If you're used to reading community threads before buying, there isn't much to read here.
Which One Do You Need?
Already have a list and need to send campaigns? You need an email sender. Sendster handles this with a low annual license cost compared to typical SaaS email marketing platforms.
Need both finding and sending? You need a stack, not a single tool. No platform does both well.
Look - most teams waste money on the sending side when the real problem is data quality. A $67/yr Sendster license connected to SES will send emails just fine. But if your list bounces heavily because your contact data is stale, your domain reputation tanks and nothing lands in the inbox. We've watched teams burn through three sending tools before realizing the issue was upstream. Solve the data problem first.
The Better Stack for 2026
Most outbound teams need three things: find contacts, verify them, send. Here's the cleanest workflow we've seen work.
Find verified contacts. Use a database with high accuracy and fresh data - 30+ search filters including role, industry, company size, and intent data help you build targeted lists fast. You want a data refresh cycle measured in days, not weeks, because stale data is the number-one cause of bounced campaigns. (If you want a deeper breakdown, see our guide to sales prospecting databases.)
Export and enrich. Push contacts to your CRM or download a CSV. Good enrichment returns 50+ data points per contact, giving your reps context before they pick up the phone. If you're comparing vendors, start with these data enrichment services.
Send via your email platform. Load your verified list into Sendster, Instantly, Lemlist, or whatever sequencer your team runs. If the list is already clean, you don't tank your domain reputation on day one. (For sending limits and safe ramp-up, read our email velocity guide.) One of our users at Stack Optimize built to $1M ARR while maintaining 94%+ deliverability and under 3% bounce - that's what clean data buys you.
Your sending tool is only as good as the data feeding it. Teams using Prospeo's verified contacts maintain under 3% bounce rates and 94%+ deliverability - because every email passes 5-step verification with catch-all handling and spam-trap removal before it ever hits your list.
Stop blaming your sender - fix the data upstream.
FAQ
Are ContactOut and Sendster competitors?
No. ContactOut finds emails and phone numbers. Sendster sends campaigns to existing lists. They serve completely different stages of the outreach workflow - data sourcing vs. message delivery.
Why is Sendster so much cheaper than ContactOut?
Different cost structure entirely. Sendster sells an annual software license starting at $67/yr, and you provide your own sending infrastructure like Amazon SES at roughly $0.10 per 1,000 emails. ContactOut charges $99-$199/mo for access to a contact database. You're comparing a one-time tool purchase to a recurring data subscription.
Can Sendster find prospect emails?
No. Sendster includes basic email verification for list hygiene, but it doesn't discover new contacts. You need a separate data tool to build your list first.
What's a better alternative to ContactOut for verified emails?
Prospeo covers 143M+ verified emails with 98% accuracy, refreshes data every 7 days versus the 6-week industry average, and costs roughly $0.01 per email. The free tier gives you 75 verified emails per month - enough to test before committing.