Opensends’s visitor ID data has been found to be wrong 70-95% of the time*
Inaccurate data from Website Visitor ID Resolution Tools can hurt your email deliverability and hold back business growth
Incorrect identity resolution of anonymous website visitor data may lead to high spam rates, poor deliverability, and a lot of wasted money. Don’t let inaccurate data hurt your marketing. Compare Opensend visitor ID data to Customers.ai head-to-head.
I agree to receive text and email updates from Customers.ai
* Based on multiple tests performed from January to April 2025 comparing form fill data on ecommerce websites using Customers.ai’s suite of visitor identification tools in comparison to other vendors in the space. Actual results are expected to vary between sites. Schedule a test to find out the accuracy of your Website Visitor ID data provider.
Read the latest
Opensend Case Study from Former Opensend Clients Who Switched to Customers.AI
Home Goods Customer Story
Higher True Match Rate
Dylan Mente
CEO
Health & Wellness Customer Story
Revenue (vs. $0)
Anastasiya Vankova
Founder
Real-life reviews from Opensend customers
- Helpful?
- Add A Comment
- Share
The cost of the tool can become expensive if you are a smaller business with a large amount of traffic or identifiable profiles.
- Helpful?
- Add A Comment
- Share
Why Brands Are Moving Away from Opensend
All of these third-party visitor ID vendors are under the delusion that their data is 90% accurate when multiple tests by brands show that it’s really 70-95% wrong.
Here’s why it’s time to switch from Opensend:
Their Data Quality Is Poor
While Opensend claims to have a high accuracy rate, tests by brands show that the data is 70-95% wrong!
Their Data is Limited
While Opensend provides email addresses and basic identifiers, it does not offer more detailed information about visitors.
They Hurt Email Deliverability
Other visitor ID providers focus on volume of emails vs. quality of emails, resulting in deliverability issues.
Limited Feature Set
The Opensend platform lacks features like customer journey tracking and advanced segmentation capabilities.
They're Too Expensive
Opensend’s pricing can be expensive, especially for higher traffic sites.
Highest True Match Rate by Far
Opensend claims an impressive 25-35% “Match Rate” for their Website Visitor ID but match rate alone is misleading—it can be inflated simply by returning more emails, even if most are incorrect.
What really matters is True Match Rate—what percentage of known, validated website users correctly identified?
Our studies show that Customers.AI’s True Match Rate is 2-18x higher than Opensend because far fewer of their “matches” actually check out, indicating serious data quality issues!
Opensend said you were their biggest competitor. They set up a trial for us and they went into Klaviyo and set up their own campaigns for their own abandoned cart campaigns. They accidentally were actually emailing everyone July 4th promos for November.
Steve Shelley
Senior Product Manager,
Cove Smart
Opensend Features vs. Customers.ai
Customers.ai is more than just email capture and we are transparent about our data. We track the entire customer journey, allow for advanced segmentation, and help you build flows that drive sales. All with the highest accuracy in the visitor ID space.
Key Features
Capture emails from website visitors + CRM integrations
Native email sending through our dedicated ESP
Advanced audience segmentation
Meta Conversions API (CAPI) integration
Email automation tools
Email deliverability Tools & Scores
Advanced Audience Analytics Platform
- Capture emails from website visitors + CRM integrations
- FREE TRIAL + Self Service
- Consumer information (address, phone, income, family, etc.)
- Ability to segment audiences by intent of the visitor (click, scroll, page views, carts etc.)
- Advanced capture settings
- Advanced audience segmentation
- Meta Conversions API (CAPI) integration
- Email automation tools
- Email deliverability Tools & Scores
- Advanced Audience Analytics Platform
- Capture emails from website visitors + CRM integrations
- FREE TRIAL + Self Service
- Consumer information (address, phone, income, family, etc.)
- Ability to segment audiences by intent of the visitor (click, scroll, page views, carts etc.)
- Advanced capture settings
- Advanced audience segmentation
- Meta Conversions API (CAPI) integration
- Email automation tools
- Email deliverability Tools & Scores
- Advanced Audience Analytics Platform
Opensend’s inaccurate data is costing you thousands!
Opensend’s data quality issues could be wasting your budget and driving up your cost per contact. With a demonstrated 20% accuracy rate based on multiple brand tests, customers are paying 25¢ per contact!
Better Data & Integrated Tools for Visitor ID Marketing
Opensend sends low-quality data into third-party ESPs, leaving brands to handle poor engagement and deliverability risks while providing only data, not tools, at the cost of email performance.
Customers.AI delivers higher-quality visitor ID data with the flexibility to send it to an ESP or use our built-in marketing tools—including email automation, segmentation, customer journeys, deliverability optimization, postcard sending, and ad platform integrations like Google, Meta, and TikTok.
The result? More accuracy and more ways to leverage visitor ID data—without ESP compliance risks.
Opensend Has Yet to Match Our Data in Head-to-Head Tests
In multiple tests by direct-to-consumer ecommerce brands, Customers.ai was shown to have a 65-85% data accuracy rate while the other top vendors, including Opensend, struggled to reach 30% accuracy.
It’s not their fault. Like most identity resolution tools, Opensend licenses their data from low-quality sources. Oftentimes, identity resolution providers don’t even know how inaccurate the data being provided to them is because it’s behind a black box!
Customers.ai’s proprietary database combined with our first-party validation tools, ensures the names, emails, and contact information provided are accurate.
The result? Your emails won’t be marked as spam, your domain won’t be penalized, and you won’t hurt your sales.
Accuracy of Top 3 ID Resolution Providers
Protect Your Sender Reputation with Our Integrated Visitor ID + Email Sending Solution
While Opensend integrates with hundreds of third-party ESPs, sending emails to contacts sourced from low-accuracy data can be risky, potentially triggering spam complaints and hurting your sender reputation.
Instead of sending your third-party data into your ESP and potentially skewing your complaint rate, we offer a fully compliant solution.
We’ll send the emails for you, so there’s no need to mix identity resolution data with your first-party customer data.
Want to learn your visitor ID provider's accuracy rate on your site?
Schedule a simple test we’ll set up in 15 minutes.
Engage and convert seamlessly across multiple channels
Ads
- Populate remarketing ad audiences
- 2x high-intent audience reach on Google & Meta
- Send event data to Meta to get 3x better ROAS and CPA
- 10x email list growth
- Increase email revenue from high-intent anonymous visitors
- Restore flows to returning customers who are otherwise unreachable due to expired cookies
Direct Email
- Identify visitors' home addresses
- Send personalized postcards
- Boost sales and LTV with high-impact, targeted direct mail
100% privacy law compliant technology
INC 5000 Fastest Growing Company in America & ICONIQ Capital + G2 Essential Tech Stack
Customers.ai vs Opensend FAQs
Can you tell me more about Opensend’s cost?
Opensend’s pricing starts at $499 per month for up to 10,000 identified visitors, making it one of the more expensive options in the market. For larger businesses, the Enterprise plan costs $8,999 per month, which can be a steep commitment. This tiered pricing structure can escalate quickly as your business grows, making it less accessible for smaller companies or those seeking cost-effective scalability.
What do Opensend reviews say about the platform?
While some users appreciate Opensend’s ability to identify visitors, reviews often mention challenges with data quality and limited feature sets. Users report that its primary value lies in retargeting, but it falls short in providing the flexibility and robust integrations needed to execute broader marketing strategies. Customers.ai, in contrast, delivers enriched data alongside seamless omnichannel integrations, ensuring your marketing efforts are more comprehensive and effective.
Who are Opensend’s competitors?
Opensend competes with platforms like Customers.ai, Retention.com, Revenue Roll, and 17hats. However, unlike its competitors, Opensend lacks advanced visitor identification features, dynamic email marketing capabilities, and the comprehensive sales automation tools offered by Customers.ai. This makes it less appealing for businesses looking for an all-in-one solution.
Does Opensend integrate with Klaviyo?
Opensend does integrate with Klaviyo, but its functionality is limited to basic data syncing for retargeting. It doesn’t offer the deeper integration capabilities and advanced segmentation options that Customers.ai provides, which are essential for creating high-performing omnichannel campaigns.
Does Opensend have an API?
Opensend does not appear to offer an API, which can be a significant limitation for businesses that rely on custom workflows or advanced integrations. Customers.ai, on the other hand, includes API access to ensure maximum flexibility and compatibility with your existing systems.
Does Opensend integrate with Shopify?
Opensend integrates with Shopify, but the features are relatively basic compared to the depth of Shopify integrations provided by Customers.ai. Customers.ai’s tools not only sync data but also allow for advanced visitor identification and personalized engagement, giving businesses a stronger edge.
Is Opensend legal?
Opensend operates within the bounds of consumer privacy policies and emphasizes legal compliance in its operations. The platform focuses on identifying users who have opted into first-party (cookie) tracking and ensures that any data shared aligns with the highest quality data brokers and credit agencies.
