Interactive Emails: AMP for Email, Polls and Carousels in 2026
Most marketing emails are static: you design it, send it, and the recipient stares at a flat layout with a button. Interactive email adds elements that respond to what the reader does — a poll that submits inside Gmail, a product carousel that scrolls in the message, a form that captures preferences without leaving the inbox.
The technology has matured considerably. In 2026, three distinct approaches are in active use: CSS-only interactivity (works almost everywhere, no special platform required), AMP for Email (Gmail-native dynamic content), and RCS business messaging (a new standard that makes SMS genuinely rich). Each has different trade-offs in terms of what it can do, which email clients support it, and which platforms let you build it without an engineering team.
What each actually delivers, where it falls apart, and which platforms support it without an engineering team.
Quick reference: matching your goal to the right approach
How the three approaches stack up against common use cases:
| Goal | Best approach | Works in Outlook? |
|---|---|---|
| Hover effects, accordion menus | CSS-only | No |
| Embedded polls or feedback forms | AMP for Email | No |
| Product carousels in email | AMP for Email | No |
| Shopping flows inside Gmail | AMP for Email | No |
| Branded interactive SMS/messaging | RCS | N/A (SMS channel) |
| Fallback that reaches everyone | Standard HTML | Yes |
The hard reality: Outlook on Windows still renders emails with Microsoft Word’s HTML engine and does not support CSS interactivity or AMP. That accounts for roughly 4% of global email opens as of early 2026 — down from its peak but still significant for B2B audiences. Any interactive email strategy needs a working fallback for readers on unsupported clients.
CSS-only interactivity: the no-setup approach
CSS-only interactivity uses checkbox inputs and the :hover and :checked pseudo-classes to create responsive elements without JavaScript. Hover-activated image swaps, FAQ accordions that expand on click, and tabbed product sections are all possible with CSS alone.
The upside: this works in any email client that renders modern CSS — Apple Mail, iPhone Mail, Gmail, Samsung Mail, and most mobile clients — without platform approval or special tooling. You add it to your existing HTML template and it works.
The core limitation is equally real. You cannot collect data. A subscriber who taps a CSS accordion or “votes” in a visually interactive poll does not send any signal back to your CRM. CSS interactive elements are visual enhancements only. They can increase time-on-email and signal a polished brand, but they cannot replace a form if you need responses or track which product variants your audience engages with.
Implementation is straightforward: add your CSS to the <style> block in the email’s <head>, place checkboxes with labels to trigger state changes, and use sibling selectors to show and hide content. Test across clients using a previewing tool before sending — drag-and-drop builders in most ESPs will strip CSS from the <head> if you are not careful about where you paste it.
AMP for Email: dynamic content inside Gmail
AMP for Email is a specification developed by Google that lets senders embed active, data-bound components directly in a message. Product carousels that scroll through live inventory. Forms that submit to your backend without opening a browser tab. NPS surveys that show the respondent live aggregate results after they answer.
Gmail supports AMP for Email. So does Yahoo Mail. Combined, those two providers cover roughly half of global email opens, which means real reach — provided your fallback HTML handles the rest.
To send AMP emails, you need to complete three steps: register your sending domain with Google’s AMP for Email program (approval typically takes a few business days), build the AMP MIME part alongside your standard HTML and plain-text parts, and use an ESP that supports sending multi-part emails with the AMP payload intact.
That last step is where most brands stall. Mainstream email marketing platforms do not natively compose and send AMP emails through a visual builder. Mailmodo is the platform built specifically for AMP email and has the most complete toolset for creating AMP campaigns without writing raw code. Other platforms require API-level control or custom development to include the AMP payload.
What AMP does best in practice:
Embedded surveys and NPS collection are the highest-adoption use case. Recipients answer inside Gmail without clicking away. Completion rates are consistently higher than link-to-external-survey approaches because there is no context switch.
Live product carousels pull real-time inventory and pricing each time the email is opened. An email sent on Tuesday shows Tuesday’s price and stock. Opened again on Thursday — updated data, automatically.
One-click preference forms let subscribers tell you how often they want to hear from you, what categories interest them, or whether they want to be moved to a different list — all without leaving the inbox. This is useful for list hygiene and reduces unsubscribes caused by frequency or relevance mismatch.
For the technical specification, see Google’s AMP for Email developer documentation and the AMP email structure guide on amp.dev.
RCS business messaging: the 2026 breakout feature
RCS (Rich Communication Services) is the protocol that replaces SMS on modern Android devices and, since iOS 18, on iPhones as well. Where SMS is limited to 160-character plain text, RCS supports images, scrollable carousels, suggested reply chips, verified sender badges, and branded message headers — all delivered to the native messaging app, with no app install required.
For brands, this means the “SMS” channel can look like a mobile app experience. Send a product recommendation with a scrollable carousel of images, pricing, and a “Shop Now” button, all inside the message thread. Recipients tap rather than click a web link in plain text.
Klaviyo launched RCS as generally available in Spring 2026, making it accessible to all brands on the platform across the United States, United Kingdom, Germany, France, Italy, Spain, Poland, Austria, Sweden, Norway, and Denmark. Klaviyo’s implementation works within existing SMS flows — build once and the platform delivers via RCS where the recipient’s device supports it, falling back to standard SMS automatically for devices or carriers that have not activated RCS yet.
Klaviyo’s RCS supports product carousels with images, pricing, and call-to-action buttons; suggested reply chips for conversational flows; and Next Best Product recommendations in SMS automations. For ecommerce brands already using Klaviyo for email, adding RCS does not require a new platform — it layers onto the same audience segments, flows, and analytics.
Klaviyo
The platform for unified customer data
Klaviyo is the gold standard for ecommerce email and SMS marketing, particularly for Shopify stores. Its deep integration with ecommerce platforms enables sophisticated automated f...
The weakness: Klaviyo’s pricing climbs steeply with list size. The Email plan starts at around $20/month for 500 active contacts and approximately $30/month for 1,000 contacts — prices sourced from third-party reviews and should be verified at the Klaviyo pricing page before committing. SMS and RCS messages are billed additionally on top of the email plan cost. At 10,000 contacts, the email plan alone runs approximately $130/month before any messaging spend. If your list is large and SMS is your primary channel, the costs become significant compared to SMS-native platforms.
RCS itself is still gaining coverage. Not every carrier activates it by default, and device support varies. The automatic fallback to SMS in Klaviyo is reliable, but brands planning RCS-first campaigns should track what percentage of their audience actually receives the rich version versus the plain SMS fallback. Klaviyo’s analytics surface this split.
Product carousels: which approach fits which situation
Product carousels are the highest-value interactive element for ecommerce brands. They let subscribers browse multiple products without leaving the inbox and act as a decision engine inside the message itself. Three ways to build them, with meaningfully different results:
CSS carousels look polished in Apple Mail and mobile Gmail but are purely cosmetic. The “next” button does not report back to your analytics. No data on which product drew the most attention. Useful for brand storytelling; limited for intent measurement.
AMP carousels pull live product data and track which item the subscriber tapped. The data flows back to your backend. The constraint is the AMP registration process and the requirement to use a compatible platform.
RCS carousels (via Klaviyo and similar platforms) appear in the native messaging app and carry full click tracking. These reach your SMS subscribers, not your email list — so this is a channel addition rather than an email improvement.
For email-channel carousels with real interaction data, AMP is currently the only path. For multichannel brands where SMS is already established, RCS carousels are easier to deploy because the sender approval is handled at the platform level.
Tools that support interactive email in 2026
Klaviyo
Klaviyo is the strongest platform for RCS and SMS-channel interactivity. The Spring 2026 release makes RCS campaigns accessible to all brands on the platform, integrating into existing flows and enabling AI-powered product recommendations across text channels. Klaviyo does not natively build AMP emails, so if AMP for Email is your goal, Mailmodo or a custom API implementation is the path.
Pricing starts around $20/month for 500 contacts on the Email plan. SMS credits are billed separately. No permanent free tier. Primarily suited to established ecommerce brands, not to early-stage senders building from zero.
See the full Klaviyo review and Klaviyo pricing breakdown for more detail.
Omnisend
Omnisend focuses on ecommerce brands wanting email, SMS, and push notifications in one place without Klaviyo’s price. Its product picker pulls products directly into email templates, and automation workflows support SMS alongside email in a single sequence. The Standard plan starts at around $16/month for 500 contacts; the Pro plan (from $59/month) includes unlimited emails and bundled SMS credits.
Omnisend does not support AMP for Email or RCS. Interactive features are limited to standard HTML and CSS plus its product content blocks. That is a real gap for brands serious about interactive engagement — but for those who need solid multichannel automation without complex interactive email, Omnisend’s pricing and ease of use are genuine advantages.
The gap shows at scale: Klaviyo’s segmentation, predictive analytics, and third-party integrations are more developed. Brands with complex product catalogs or high-volume SMS programs tend to outgrow Omnisend. See the Omnisend review for a full feature breakdown.
Omnisend
Ecommerce email and SMS made easy
Omnisend is an ecommerce-focused marketing platform that combines email, SMS, and web push notifications. It offers pre-built automation workflows for common ecommerce scenarios li...
| Feature | Klaviyo | Omnisend |
|---|---|---|
| Rating | 4.6/5 | 4.6/5 |
| Starting Price | $20/mo | $11/mo |
| Free Plan | 250 subscribers | 250 subscribers |
| Founded | 2012 | 2014 |
| Email Templates | 100 | 130 |
| Integrations | 350 | 130 |
| Deliverability Rate | 99% | 98.5% |
| Marketing Automation | ✓ | ✓ |
| A/B Testing | ✓ | ✓ |
| Landing Pages | ✓ | ✓ |
| Segmentation | ✓ | ✓ |
| Drag & Drop Editor | ✓ | ✓ |
| SMS Marketing | ✓ | ✓ |
| Ecommerce Features | ✓ | ✓ |
| API Access | ✓ | ✓ |
| Multi-Language | ✓ | ✓ |
| Web Push Notifications | ✕ | ✓ |
| Live Chat | ✕ | ✓ |
| Advanced Analytics | ✓ | ✓ |
Common mistakes that undercut interactive email campaigns
No fallback content. Every AMP or CSS interactive element needs a fallback for Outlook, older mobile clients, and any client that does not support the feature. Test the fallback explicitly — do not assume the email software handles it gracefully.
Testing in only one client. Your interactive carousel looks perfect in Gmail. Your B2B buyers on Outlook see a layout that never loaded. Tools like Litmus and PutsMail (free for basic previews) let you see how your email renders across 80+ clients before you send.
Stacking multiple interactive elements. A carousel, an embedded poll, a countdown timer, and a hover-reveal section in one email creates visual clutter. Pick one interactive element per campaign and give it room to breathe.
Not tracking the interactive element separately. If you add a product carousel, track clicks per product slot — not just total click-through rate. The distribution tells you which products resonate with that segment. That data informs your merchandising and your next campaign.
How to choose the right approach for your situation
If your audience is primarily email-based and you want embedded polls, forms, or live product data: invest in AMP for Email. The one-time registration overhead is manageable, and the engagement lift from in-email surveys is consistently higher than link-to-form approaches. Check your analytics first — how large is your Gmail segment? If it is below 20% of opens, the AMP investment may be hard to justify immediately.
If your brand already uses SMS and you want richer messaging: Klaviyo’s RCS support is the most developed implementation available in 2026. The investment pays off most for brands with 2,000 or more SMS subscribers and an ecommerce catalog that benefits from visual presentation.
If you want to add visual depth with zero platform changes: CSS-only interactivity is available in any ESP today. The engagement lift is modest but measurable, and the implementation risk is minimal.
For a broader look at ecommerce email tools, see our best email marketing for ecommerce guide. For cost comparisons across all major platforms, the email marketing pricing overview covers what you will actually pay at different list sizes.
Klaviyo
The platform for unified customer data
Free plan · from $20/mo
Sources
- Klaviyo — Email, SMS and RCS Marketing — accessed 2026-04-15
- Omnisend — Email & SMS Marketing Platform — accessed 2026-04-15
- Google AMP for Email Documentation — accessed 2026-04-15
- GSMA — RCS Business Messaging Standard — accessed 2026-04-15
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