Best Shopify Popup and Email Capture Apps to Grow Your Subscriber List

The best Shopify popup apps help you collect subscribers without making shopping feel like an obstacle course. Choosing one starts with a distinction: do you need better onsite forms, or a platform that also sends your email and SMS campaigns? This comparison examines six email capture tools, their targeting options, and the merchants they suit. The order is not a ranking. Start with your existing marketing setup, then choose the capture experience you actually need.

1. OptiMonk

Best for: Merchants who want a dedicated onsite capture tool and prefer AI-assisted campaign creation without replacing their email marketing platform.

OptiMonk focuses on the moment a visitor encounters an offer. Its current positioning emphasizes an AI agent: describe your goal and provide your website URL, and it creates an on-brand popup while suggesting targeting, triggers, and testing ideas. This distinguishes it from a purely template-first workflow, although generated campaigns still need merchant review.

Relevant formats include email and SMS popups, banners, multistep capture, and gamified offers. Customization covers layouts, imagery, fonts, buttons, and coupon presentation. A/B testing lets you compare messages and offers rather than assuming the first design is the right one.

Targeting and triggering controls cover traffic source, visitor behavior, and display timing. Mobile-specific triggers are documented separately, which matters because desktop exit intent does not translate directly to a touchscreen. For example, consider a source-specific welcome offer instead of showing every visitor the same discount.

The Shopify listing names integrations including Klaviyo, Mailchimp, ActiveCampaign, Attentive, and Postscript. That makes OptiMonk worth considering when your sending platform is already established but its forms do not meet your campaign needs.

Important consideration: Treat it as an additional capture layer, not a replacement for email or SMS delivery. Check field mapping and consent transfer, and review AI-generated copy, discounts, and targeting before publishing.

2. Poptin

Best for: Store owners who want a visual popup builder, varied campaign formats, and the flexibility to connect an existing email system.

Poptin combines popup creation with embedded forms and increasingly prominent email marketing capabilities. Its current Shopify listing includes promotional emails, welcome messages, sequences, and automation alongside its capture features. It is therefore best understood as capture-led software with broader marketing functionality, rather than strictly a popup-only app.

Its formats include lightbox popups, notification bars, discount offers, spin wheels, and embedded signup forms. The drag-and-drop builder and responsive templates provide a familiar starting point for merchants who want direct visual control. A/B testing and analytics support comparing campaigns after launch.

Triggers include exit intent, time delay, scrolling, inactivity, and clicks. Page, traffic-source, location, and scheduling rules help narrow an offer to an appropriate audience. Shopify-specific cart and customer targeting are also advertised, but verify the exact rules and plan access required for your intended campaign.

Poptin lists integrations with Klaviyo, Mailchimp, Omnisend, and other marketing services. This gives merchants a choice between using its own available email features and passing captured contacts into another platform.

Important consideration: Collecting a phone number is not the same as completing a working SMS subscription workflow. Before choosing Poptin for SMS capture, verify how your intended SMS provider receives the number, consent status, and required fields. Also confirm which email features are available in your Shopify account.

3. Justuno

Best for: Growth-focused merchants who want targeted list-building campaigns and value strategic, design, or optimization assistance.

Justuno is a dedicated onsite list-growth and personalization tool, rather than a full email campaign platform. Its current Shopify offering combines popups with Spotlight visitor identification and emphasizes expert support. For this comparison, the key question is whether its capture workflows justify adding another tool alongside your existing marketing system.

Email and SMS capture options include multistep experiences, quizzes, spin-to-win promotions, exit offers, and banners. Design customization and A/B testing let teams vary presentation, messaging, and incentives. Its Smart Timing feature is marketed as selecting an appropriate moment to show an offer; evaluate that against your own shopper experience rather than treating the claim as a guaranteed improvement.

Behavioral targeting can account for signals such as traffic source, cart activity, and returning visitors. Justuno also documents Shopify customer and product-data targeting through workflow filters. These controls suit merchants planning several distinct customer journeys rather than one storewide signup box.

Documented marketing connections include Klaviyo, Omnisend, Postscript, and Attentive. The Klaviyo integration can pass contacts and associated information into selected lists, helping connect preference collection with subsequent messaging.

Important consideration: This is a more involved choice than installing a basic form. Confirm the plan, service scope, and setup responsibilities. If evaluating visitor identification as well, assess its privacy implications separately from voluntary email and SMS opt-ins.

4. Shopify Forms

Best for: Merchants who want straightforward, Shopify-native signup forms without paying for a separate specialist capture app.

Shopify Forms is Shopify's own free form-building app. It supports popup and inline forms for subscriber acquisition, wholesale inquiries, and other customer information collection. Its main attraction is operational simplicity: form submissions contribute to customer profiles inside the system you already use to run your store.

Customization includes colors, images, form fields, translations, and post-submission experiences. You can offer a discount, collect useful preferences, and apply tags. Those capabilities make it a practical starting point for a newsletter offer or a focused lead form, without building an elaborate onsite campaign program.

Popup display settings control how forms appear, while inline forms provide a less interruptive option within a page. Shopify also supports creating a landing page from the Forms app. Start by checking whether its available presentation and display controls cover your specific use case.

The strongest integration story is within Shopify: customer information, tags, marketing automations, and Shopify Flow workflows. Current documentation supports email and SMS marketing consent collection when the appropriate fields and settings are configured.

Important consideration: Shopify Forms does not itself replace an SMS sending provider. Shopify's documentation states that, when SMS double opt-in is used, the SMS partner must confirm the opt-in and update the subscription status. Verify that downstream process before launching a phone-number form.

5. Omnisend

Best for: Merchants who want subscriber collection, email campaigns, SMS messaging, and welcome automation managed within one marketing platform.

Omnisend is a broader email and SMS platform with built-in forms. Its advantage is continuity: you can collect a subscriber and build the follow-up journey in the same environment, rather than maintaining a separate capture integration. That makes it a sensible shortlist option when you are choosing your marketing platform as well as your forms.

Capture formats include popups, flyouts, fullscreen forms, embedded forms, and landing pages. Its editor supports email addresses, phone numbers, and custom information. Multistep forms let you spread questions across stages instead of demanding every detail in one crowded panel.

Targeting includes subscription status, audience segments, page rules, location, source, and campaign parameters. Shopify-specific cart targeting can use cart value or item count. Device controls and reappearance limits help tailor mobile campaigns and avoid repeatedly interrupting shoppers who have dismissed an offer.

The Shopify integration connects capture with the platform's ecommerce marketing workflows. For an existing Omnisend merchant, testing these native forms is a logical first step before adding another subscription and contact-sync process.

Important consideration: Settings differ by format. Landing pages do not offer the same targeting controls as popups, and custom triggers can override normal targeting rules. Evaluate the exact form you intend to use, not just the platform's overall feature list.

6. Klaviyo

Best for: Merchants who want signup information to feed directly into customer profiles, audience segmentation, and personalized email or SMS flows.

Klaviyo is a marketing platform with native web forms, not simply a popup app. Its practical strength is connecting the acquisition message with what happens next. A preference collected at signup can inform subsequent segmentation, making it relevant for merchants who plan differentiated customer journeys.

Formats include popups, flyouts, embedded forms, and full-page forms, with teasers available for supported overlay formats. Multistep forms can collect email and SMS consent across separate steps. The form-building tools support branded presentation without requiring a specialist capture app for every campaign.

Display controls include timing, frequency, device selection, and custom triggers. Targeting can use visitor criteria, URLs, campaign parameters, and location. You can also manage display priority when multiple overlay forms could qualify, helping prevent competing campaigns from overwhelming the same shopper.

Klaviyo's Shopify integration connects store activity and customer information to its marketing environment. It also supports specialist capture partners, including Poptin and Justuno, so choosing its sending platform does not permanently commit you to its native forms.

Important consideration: The broader platform requires more decisions than a simple newsletter popup. Plan your lists, consent collection, and welcome flows before adding complex targeting. Klaviyo also notes that form information is unavailable for anonymous visitors who never provide an email address or phone number.

7. How to Choose Without Frustrating Shoppers

Use the same small campaign brief to evaluate each shortlisted tool. A simple first-purchase offer with an optional SMS step will reveal more than browsing template galleries alone.

• Mobile experience: Test on an actual phone. Check keyboard behavior, readable consent text, button spacing, and an obvious close control. Avoid covering essential shopping actions.
• Targeting: Begin with relevant pages, sensible timing, subscriber suppression where supported, and restrained reappearance. Add complexity only when you have a clear reason.
• Signup incentives: Match the promise to your margins and audience. Consider early access or useful product guidance alongside discounts, and deliver exactly what the form promises.
• Integrations: Submit test email and SMS signups. Confirm the destination list, custom fields, consent status, and welcome-message behavior before sending real traffic.
• Ease of use: Recreate one campaign, preview it, revise it, and pause it. Include whoever will maintain the app in this evaluation.
• Budget: Compare the combined cost of capture, contact storage, message sending, required features, and staff time. Check current plan limits rather than comparing starting prices alone.

8. Choose the Tool That Fills Your Actual Gap

Start with Shopify Forms for simple native capture. Consider OptiMonk for AI-assisted onsite creation, Poptin for visual flexibility, and Justuno for targeted growth programs with support. Choose Omnisend or Klaviyo when capture belongs within a broader marketing platform. The right choice is the smallest setup that delivers relevant offers, reliable consent handling, and useful follow-up without interrupting the shopping experience.

Summing It Up