Email tool that shows different content blocks to different subscribers within one email

The feature is usually called dynamic content or conditional content. It lets you build one email with blocks that show or hide based on subscriber data, interests, or segment membership.

A few tools that support it:

• Klaviyo — show/hide blocks and offer different versions of a block to different audiences. (help.klaviyo.com)
• Brevo — set conditions to show or hide email content for specific recipients. (help.brevo.com)
• Campaign Monitor — display content based on a subscriber’s list or segment. (help.createsend.com)
• Salesforce Marketing Cloud — dynamic blocks based on recipient attributes or behavior. (help.salesforce.com)
• Seguno — conditional sections based on subscriber data, including segments or purchase history. (support.seguno.com)

If you mean a specific use case—like showing different newsletter topics based on each person’s selected interests—Klaviyo, Brevo, or Campaign Monitor are good places to start.

Several email platforms offer this feature, usually called dynamic content or conditional blocks. Here are the main options, grouped by the kind of user they suit.

Mid-market and SMB tools

• Mailchimp: Its dynamic content lets you show or hide a content block for a chosen audience segment, so one send covers several groups. Instead of sending 2 versions of the same newsletter, you create 1 email for the whole audience.
• MailerLite: Blocks can be set to appear only for particular subscriber groups. The setup involves using subscriber data like interests and demographics to set the visibility of content blocks.
• Cyberimpact: This is a newer feature that lets you set criteria for each block, up to 20 per block, and it displays the right content to the right subscriber. The article is about 18 months old, so check that it still matches the current product.
• HighLevel: Its Conditional Elements let you show or hide specific content blocks in the Email Builder based on each contact's data.
• ActiveCampaign: Its Conditional Content blocks are described as capable at mid-market pricing (one source's claim, not independently verified).

Enterprise and ecommerce platforms

• Klaviyo: Reviewers describe its block builder as one that lets teams create conditional logic without touching code. It is a strong pick for product-recommendation blocks.
• Braze: It uses Liquid templating for granular control over conditional rendering. It suits teams that need logic driven by app behavior.
• Customer.io: Its Liquid templating gives the most granular control over conditional content among the platforms one comparison reviewed.
• Insider One: Its conditional blocks can be applied to specific modules, so a section such as a women's collection can be limited to a particular audience.
• Salesforce Marketing Cloud and Adobe Campaign: Both support dynamic content through content builder blocks and conditional blocks driven by segmentation, respectively, and suit large organizations with existing CRM setups.

Caveats

• Check the rules engine before buying. One Zoho Campaigns user complained that you can only add one condition for the criteria, then an "else if". Other users have reported limits on which field types can be used as criteria.
• Always include a default block. If they don't meet any conditions, they'll receive the default version. Without one, some contacts can end up with an incomplete email.
• Many reviews and rankings are vendor-written or affiliate-driven, so test the feature with a small list before committing.

If you tell me your subscriber data (for example, e-commerce purchase history versus B2B roles) and your budget, I can narrow this to two or three platforms.

The feature you are looking for is widely known in the industry as Dynamic Content, Conditional Content, or Smart Content.

Most modern email marketing platforms support this, allowing you to create a single email template where specific blocks (text, images, CTAs, or product recommendations) automatically change based on the subscriber's profile, behavior, or segment.

Top Email Tools with Dynamic Content Capabilities

Depending on your business size and needs, here are some of the most highly regarded platforms for this feature:

• ActiveCampaign: Widely recognized for its powerful, flexible "Conditional Content" feature. It allows you to link almost any block in your email to specific segments based on behavior, purchase history, or custom fields, making it excellent for granular targeting.
• Klaviyo: The industry leader for ecommerce brands. It is specifically built to pull in real-time data from your store (like recently viewed items or purchase history) to create highly personalized, dynamic product blocks.
• Mailchimp: A great option for smaller businesses or those who want an all-in-one platform. It allows you to personalize content blocks and send targeted messaging based on tags and customer data without requiring advanced technical skills.
• HubSpot: Ideal if you are already using their CRM. Their system is deeply integrated, so your dynamic content blocks can trigger based on any data point stored in your CRM, such as lifecycle stage or interaction history.
• Braze, Customer.io, and Iterable: These are "enterprise-grade" platforms that excel in real-time, behavioral, 1:1 personalization. They are better suited for large teams that need to orchestrate complex, cross-channel experiences.

How It Generally Works

Regardless of the tool you choose, the workflow usually follows these steps:

1. Define Your Segments: You create groups of subscribers based on shared traits (e.g., "Frequent Buyers" vs. "New Subscribers") or interests.
2. Build the Template: You design your email and insert a "Dynamic" or "Conditional" block.
3. Set the Rules: For that block, you set a rule (e.g., "Show this hero image if the subscriber is in the 'Cat Lovers' segment; otherwise, show the 'Dog Lovers' image").
4. Send: When the email is sent, the platform evaluates each recipient's data in real-time and renders the correct version for them.

A Tip for Success: Always set a "default" or "fallback" version for your dynamic blocks. This ensures that if a subscriber doesn't perfectly match a segment or has missing data, they still receive a relevant, non-broken email.

You’re looking for dynamic content or conditional content in an email platform.

Klaviyo is a strong fit: its editor lets you show or hide blocks based on subscriber profile properties, or create different versions of a block for multiple audiences—all within one email. ¹

Mailchimp also supports this. Its Dynamic Content feature can show different content to recipients based on conditions, and its conditional merge tags let you control who sees particular content. ¹²¹⁴

In either case, you’ll need subscriber data—such as location, interests, or loyalty tier—to determine which content each person sees. ¹