Opensend vs. Wunderkind: A Comparison Guide

Francesco Gatti
March 21, 2025

Retargeting lost website visitors is one of the most effective ways to increase conversions, but choosing the right platform can make all the difference. With various solutions available, businesses need to compare features, pricing, and overall performance to find the best fit.

Opensend and Wunderkind are two well-known options for email-based remarketing, both designed to help businesses recover potential customers. However, their approaches differ significantly in terms of lead identification, targeting capabilities, and pricing flexibility.

This guide breaks down the key differences between Opensend and Wunderkind, including lead scoring, attribution, cross-device tracking, and customer support. By the end, you’ll have a clear comparison to determine which platform offers the best value for your retargeting strategy.

Comparison Summary: Opensend vs. Wunderkind

Businesses looking to maximize their retargeting efforts often compare Opensend and Wunderkind, two platforms designed to recover lost website visitors through email remarketing. While both solutions aim to increase conversions, their methods, technology, and pricing structures set them apart.

What Is Opensend?

Opensend is a data-driven retargeting platform that specializes in identifying anonymous website visitors and converting them into actionable leads. It integrates with CRMs, email marketing platforms, and paid ad networks, enabling businesses to launch highly targeted remarketing campaigns. 

With real-time visitor identification, cross-device tracking, and advanced lead scoring, Opensend helps businesses focus on high-intent users rather than broad, untargeted audiences.

Opensend is designed for businesses that want complete control over their retargeting strategy, offering transparent pricing, roll-over credits, and no long-term contracts. This makes it an ideal solution for companies looking for flexibility and high-quality lead attribution.

What Is Wunderkind?

Wunderkind is an enterprise-level identity resolution platform that helps brands recognize website visitors and deliver automated marketing campaigns through email and SMS. It focuses on large-scale customer acquisition by using behavioral data and predictive modeling to match users with marketing messages.

Unlike Opensend, which prioritizes real-time visitor identification and precise targeting, Wunderkind relies on probabilistic matching rather than deterministic tracking. Its pricing is tailored to enterprise brands, often requiring long-term commitments and volume-based pricing structures, making it less accessible for businesses looking for a more flexible, cost-effective solution.

Feature Comparison: Opensend vs. Wunderkind

This breakdown highlights key differences between Opensend and Wunderkind, making it easier to see which platform aligns best with specific business needs.

Opensend

Wunderkind

Lead Scoring Algorithm

Uses advanced scoring to rank high-intent visitors

No dedicated lead scoring system

Quality Attribution

Provides detailed tracking and ROI measurement

Limited attribution visibility

Domain Reputation and Deliverability Protection

Protects sender reputation and ensures high deliverability

Shared network may impact email performance

Proprietary Technology

Uses real-time visitor identification and tracking

Relies on pre-existing opt-in user network

Cross-Device Identification

Tracks users across multiple devices for better targeting

No advanced cross-device tracking

Transparent Pricing

Clear, upfront costs with no hidden fees

Pricing structure is less transparent

Roll Over Credits

Unused credits carry over for future use

No roll-over credits, unused credits expire

No Annual Contract

Flexible, pay-as-you-go model

Requires long-term contract

Unlimited 2-Week Trial

Full access trial with no restrictions

No comparable free trial available

Best-In-Class Customer Service

Dedicated support team with personalized assistance

Limited customer service options

Opensend Revive

Updates undeliverable emails to recover lost leads

No feature to update outdated emails

Retargeting Ads via Facebook Integration

Syncs visitor data with Facebook Ads for multi-channel retargeting

No direct Facebook ad integration

Billed for Net New Leads

Charges only for verified new leads

May include existing leads in billing

Lead Scoring Algorithm

Opensend uses an advanced lead-scoring algorithm to rank visitors based on intent and engagement. It evaluates factors such as time spent on-site, product views, and interaction history to prioritize high-value leads. This ensures businesses focus on users most likely to convert, improving the efficiency of their retargeting efforts.

Wunderkind does not offer a dedicated lead scoring system. Instead, it relies on predictive identity resolution to match users with marketing messages. 

While this allows for broad targeting, it lacks the precision of Opensend’s scoring model, making it harder for businesses to differentiate between casual browsers and high-intent visitors.

Quality Attribution

Opensend provides detailed attribution tracking, giving businesses clear insights into where their leads originate and how they engage with retargeting efforts. 

With deep integration into CRMs and analytics platforms, businesses can measure the exact return on investment from Opensend campaigns.

Wunderkind offers attribution but lacks full transparency. Because it relies on a probabilistic matching system rather than deterministic tracking, it can be more difficult for businesses to assess the direct impact of their campaigns and optimize their strategy accordingly.

Domain Reputation and Deliverability Protection

Opensend places a strong emphasis on email deliverability and sender reputation. By using verified sender protocols, maintaining list hygiene, and following industry best practices, Opensend ensures high email deliverability rates and prevents messages from being flagged as spam.

Wunderkind’s large-scale email approach may increase deliverability risks. Since its system focuses on volume-based outreach rather than targeted segmentation, businesses may see fluctuations in email performance, with a greater chance of messages being filtered into promotions or spam folders.

Proprietary Technology

Opensend leverages proprietary technology to provide real-time visitor identification, deterministic tracking, and automated lead capture. Its system ensures that businesses can accurately identify and retarget high-intent visitors with personalized marketing campaigns. 

By integrating with CRM platforms, email marketing tools, and paid ad networks, Opensend delivers a seamless and data-driven approach to retargeting.

Wunderkind operates on predictive identity resolution, which uses probabilistic matching to recognize users across different sessions and devices. While this approach can reach a broad audience, it may not be as precise as Opensend’s deterministic tracking. 

Businesses that prioritize accuracy and data transparency may find Opensend’s technology more effective for high-quality lead generation.

Cross-Device Identification

Opensend accurately tracks users across multiple devices, allowing businesses to maintain consistent messaging as visitors switch between mobile, desktop, and other platforms. This creates a seamless customer experience and improves campaign performance by preventing duplicate targeting.

Wunderkind also offers cross-device tracking but relies on probabilistic matching rather than deterministic identification. This means that while it can estimate user activity across devices, it may not consistently achieve the same level of precision as Opensend’s tracking system.

Transparent Pricing

Opensend offers clear and upfront pricing so you know exactly what you’re paying for. There are no hidden fees, and billing is based on verified new leads rather than bulk contact lists. This makes budgeting for retargeting campaigns simple and cost-effective.

Wunderkind follows an enterprise-level pricing model, which can be less transparent. Since pricing is typically customized based on business size and volume, companies may find it difficult to assess costs upfront. This lack of clarity can make it harder for smaller businesses or mid-market brands to determine whether Wunderkind fits within their marketing budget.

Roll Over Credits

Opensend allows businesses to roll over unused credits, ensuring they only pay for what they use. This flexibility is particularly useful for businesses with fluctuating marketing budgets or seasonal traffic variations. Opensend helps companies maximize their investment without unnecessary waste by allowing credits to carry over.

Wunderkind does not offer roll-over credits. Any unused credits within a billing cycle expire, leading to inefficiencies in spending. Businesses that experience inconsistent website traffic may find this model less cost-effective compared to Opensend’s more flexible approach.

No Annual Contract

Opensend provides a month-to-month pricing model with no long-term commitments. Businesses can scale their usage as needed without being locked into an annual contract, making Opensend an ideal solution for companies looking for flexibility in their retargeting efforts.

Wunderkind typically requires long-term enterprise contracts, which may not be suitable for smaller businesses or those wanting to test different retargeting solutions before committing. The lack of contract flexibility can make it challenging for businesses to adjust their marketing strategies based on performance.

Unlimited Two-Week Trial

Opensend offers an unlimited two-week trial, allowing businesses to test its full functionality without restrictions. This allows companies to evaluate Opensend’s lead generation, retargeting capabilities, and integration options before committing financially.

Wunderkind does not provide a comparable free trial. Since pricing and implementation are customized for each business, companies must commit without fully experiencing the platform’s capabilities beforehand. This can make it difficult for businesses to determine whether Wunderkind fits their retargeting needs.

Best-In-Class Customer Service

Opensend provides dedicated customer support with personalized assistance for setup, troubleshooting, and campaign optimization. Businesses receive direct access to a responsive support team that helps them maximize performance and ensure smooth integrations with CRM, email, and ad platforms.

Wunderkind’s customer service is primarily geared toward enterprise clients, often requiring businesses to contact account representatives for assistance. While support is available, smaller businesses or those needing immediate help may experience longer response times or less hands-on assistance than Opensend.

Opensend Revive

Opensend Revive helps businesses recover lost leads by updating outdated or undeliverable email addresses. This feature ensures businesses can continue retargeting potential customers, even if their contact information has changed. 

By keeping email lists clean and up to date, Opensend improves campaign deliverability and engagement rates.

Wunderkind does not offer a similar feature. If an email address becomes outdated or undeliverable, there is no process for recovering or updating that lead’s contact information. This limitation may reduce the effectiveness of long-term remarketing efforts.

Retargeting Ads via Facebook Integration

Opensend seamlessly integrates with Facebook Ads, enabling businesses to retarget identified visitors across social media. This multi-channel approach enhances marketing efforts by reinforcing messaging through both email and paid social campaigns, increasing conversion opportunities.

Wunderkind does not offer direct Facebook integration for retargeting ads. While it focuses heavily on email and SMS marketing, businesses looking to implement a broader omnichannel strategy may find Opensend’s capabilities more effective for reaching potential customers across multiple platforms.

Billed for Net New Leads

Opensend charges businesses only for verified new leads, ensuring they are not billed for contacts already in their system. This pricing model helps businesses optimize their marketing spend by focusing only on fresh prospects who have not been previously engaged.

Wunderkind’s pricing model may include existing leads, meaning businesses could end up paying for users who have already interacted with their brand. This can lead to inefficiencies in marketing budgets and a lower return on investment compared to Opensend’s more cost-conscious approach.

The Verdict: Opensend

When comparing Opensend and Wunderkind, Opensend stands out as the more flexible, data-driven, and cost-efficient solution for businesses looking to improve their retargeting strategy. Its real-time visitor identification, advanced lead scoring, and cross-device tracking allow businesses to focus on high-intent users while maintaining full control over their marketing efforts.

Opensend’s transparent pricing, lack of long-term contracts, and roll-over credits make it a more accessible option for businesses of all sizes, ensuring they only pay for what they need. The ability to integrate with Facebook Ads alongside email remarketing provides a multi-channel advantage, reaching potential customers across different platforms.

While effective for enterprise clients, Wunderkind follows a bulk-based, predictive identity resolution approach that may not offer the same level of precision and transparency. With long-term contracts, limited customer support for non-enterprise clients, and a lack of features like Facebook integration and email revival, Wunderkind may not be the best fit for businesses looking for flexibility and clear attribution.

For companies that prioritize data accuracy, cost efficiency, and multi-channel retargeting, Opensend is the better choice. Its real-time lead identification and customizable pricing structure make it an ideal solution for businesses that want a more innovative, effective way to recover lost leads and drive conversions.

Maya Kim from GROUPON shared the following:

"Opensend has been really good for us. We have seen immediate ROI and great engagement from the emails we collected. On average, we see a 50% open rate and 10% click-through rate… almost better than our newsletter. It’s a no-brainer for any ecomm store, and they also have a great support team." 

Opensend gives businesses the tools and insights needed to turn lost website visitors into paying customers while maximizing marketing efficiency.

The Bottom Line

Opensend delivers a smarter, more flexible approach to retargeting, with real-time visitor identification, transparent pricing, and seamless multi-channel integration. Unlike Wunderkind, it offers greater control, cost efficiency, and no long-term commitments, making it a better fit for businesses looking to maximize ROI.

Experience the difference with Opensend. Start your free trial today and see how easy it is to turn lost visitors into engaged customers.

Sources:

How Email Sender Reputation Affects Email Deliverability | Mailchimp

What is cross-device tracking? | BigCommerce

What Is Retargeting? How To Set Up an Ad Retargeting Campaign | HubSpot

A Definitive Guide to Understanding User Intent | PepperContent

“Thought it was too good to be true until we hit 20x ROI. We tried other services like Opensend but they didn't work for our clients. One of our clients is getting over 150 new leads a day and a 20x return on their investment with Opensend.”

Nehal Kazim

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