12 Best Customer Engagement Platforms in 2026

A customer engagement platform messages the people who use your product, and it picks each message from what they do. A sign-up starts onboarding. A purchase stops a reminder. A long gap triggers a win-back. The category spans enterprise suites that quote six-figure contracts and tools a two-person startup can run on a free plan, so the right shortlist depends on who is buying.

This page covers 12 tools, grouped by buyer, with the prices, plans, channels and SDKs each vendor publishes. Where a vendor only quotes a price, you will see that too.

Disclosure: I build Sequenzy, and it is in the last group. It is not the right pick for every team, and the sections below say where the bigger platforms win.

Quick comparison table

What a customer engagement platform is

Three neighboring categories get confused with it. Each distinction changes what you have to build.

Against a CRM

A CRM is built around accounts, deals and conversations for your sales and support staff. A customer engagement platform sends a message stream to users who may never talk to anyone on your team, and it reacts to product events such as a completed onboarding step or a failed payment. If your question is who to call, you want a CRM. If it is what each user should see next, you want this category.

Against an email service provider

An ESP is strongest at email: lists, templates, deliverability and bulk sends, and many stop at the inbox. A customer engagement platform also owns device tokens, in-app surfaces and mobile events, so it can reach a logged-in user on their phone. Check whether an ESP's push or in-app features share its email data model or are bolted on through a partner. That decides whether a sequence can branch on an app event.

Against a customer data platform

A CDP collects events and identities from many sources, cleans them, and sends the result to other tools, usually without sending the message itself. A customer engagement platform needs clean data, so it either sits downstream of a CDP or includes a lighter version of one. Decide whether you are buying a data layer, a messaging layer or both.

How pricing works

Vendors price on several different units, and the unit decides what a growing app pays. Read the unit before the headline price.

• Monthly active users. Braze prices on MAU plus Action Credits for messaging. CleverTap uses MAU or data points. MoEngage uses Monthly Tracked Users. OneSignal bills mobile push per MAU and counts any mobile record active in the last 30 days, even if that device never opted in to push.
• Profiles or contacts. Customer.io bills people plus objects as profiles. Klaviyo bills active profiles, which it defines as contacts who may receive marketing email.
• Opted-in subscribers. OneSignal bills web push per opted-in subscriber, so unsubscribed browsers drop out of the count.
• Sends or emails. Customer.io charges $0.12 per additional 1,000 emails after 1 million a month on Essentials. OneSignal's Growth plan includes 20,000 free email sends a month, then $1.50 per 1,000. Sequenzy bills by emails sent, with unlimited contacts.
• Seats and outcomes. Intercom charges per seat, plus $0.99 per Fin outcome.

Braze, MoEngage, Airship, Insider and Bloomreach price by quote, and Iterable's public pages show no price. CleverTap publishes a Core price but quotes Pro and Ultimate. Customer.io, OneSignal, Intercom and Sequenzy publish their plans. An unpublished price is not automatically an expensive one, but you cannot compare it until you hold a written quote in the same unit, with the same channels and the same volume.

The units matter in practice. An app with 50,000 monthly active users pays OneSignal's published $0.012 per MAU for mobile push, which is $600 a month before email, web push or the platform fee. On Customer.io's Essentials table, 20,000 profiles is $235 a month. Those bills count different things, so compare them only after you have fixed the scope.

Ask every vendor the same four questions: what is the unit, are inactive users counted, what does each channel cost on its own, and what happens above the committed volume.

What implementation costs

The license is the visible cost. Engineering time is the larger one, and it goes to four things.

• App SDKs. Each app needs one. Braze lists Web, Android, Swift, Flutter and React Native. Iterable covers iOS, Android and React Native, with an Expo plugin. If your app is Expo-managed, confirm each vendor's Expo path before you sign.
• Push credentials. iOS needs an APNs key and Android needs FCM configured. Klaviyo asks for a Google service account key and your package name. MoEngage needs a google-services.json file and an APNs authentication key.
• Rich push on iOS. Images need a Notification Service Extension in the app. Klaviyo and Iterable both document this, and CleverTap needs one to record iOS push impressions.
• Identity and events. Klaviyo's in-app forms fire only from events sent through its mobile SDK, so an event sent from your backend will not trigger one. Iterable's in-app messages display only while the app is in the foreground. Insider's basic SDK lacks dynamic content and cart reminder push, so personalization needs its advanced integration.

Some constraints depend on the vendor. Web push needs HTTPS and a service worker, and CleverTap's iPhone home-screen web push also needs a manifest. Customer.io does not send native web push, and its documented workaround routes through webhooks to Airship or OneSignal. Bloomreach needs its Customer Success Manager to enable in-app messages for your project.

If you run a warehouse or CDP, budget for the sync and for testing duplicate events, which corrupt segments quietly. Sort out identity and events before you compare channel lists. A channel without clean events is a feature you cannot use.

Journey rules to check before you buy

Every platform here sends on several channels. What separates them is how a journey decides which channel a person gets, and what stops the same person getting the same message twice.

1. Branching on engagement. Check which events a branch can read: email clicks, push opens, in-app dismissals. Prefer clicks over email opens, because mail privacy features record opens without anyone reading.
2. Channel choice and fallback. Picking the best channel for each person and rerouting when the first attempt fails are two different features. Most fallbacks are a wait plus a branch that you build yourself.
3. Frequency caps. Ask which channels count, whether the cap is pooled or per channel, and whether a capped message is dropped or held. A cap that counts only push will not stop an email and a push from landing together.
4. Quiet hours and preferences. Check local time handling, whether held messages release in one burst, and whether a person who turned off a channel is skipped before the step runs.
5. Exits and reporting. A person who converted should leave the journey, and you should be able to see why a message was skipped, capped or undeliverable.

To keep email and push from duplicating each other, pick a lead channel, wait, and send the second channel only to people who did not click. Braze caps across channels with rules that target one channel or all of them. Customer.io applies per-person limits across the workflows you tag, for the channels you pick. OneSignal caps push only. Sequenzy caps marketing email, and you build the push and in-app stop logic with wait-for-event steps, stop conditions and segment branches.

The 12 tools, grouped by buyer

Enterprise consumer apps usually have an engineering team, a data team and a budget that starts in five figures. Mid-market teams have one or two platform owners and need predictable pricing. Startups and lean teams need something that fits a small team and a small budget.

Enterprise consumer apps

1. Braze

Best for: Large consumer apps that want push, in-app, email, SMS and WhatsApp under one platform, and that will staff it properly.

Pricing: Sales-led. Braze publishes its edition names, Go, Select, Pro and Enterprise, but no dollar amounts. Contracts combine an edition, monthly active users, Action Credits and add-ons. There is no free plan, only a free trial and startup programs. Email, SMS, WhatsApp and content cards draw Action Credits. Push and in-app messages are not listed among the credit-consuming features.

Braze lists email, push, in-app messages, SMS, MMS, RCS, WhatsApp and content cards in every tier. Its SDK documentation covers Web, Android, Swift, Flutter and React Native.

Where it falls short: The bill is hard to predict before a quote, since monthly active users, profiles and Action Credits all move it. A small team will use only a fraction of the platform.

Verdict: The default enterprise pick when channel breadth and staffing matter more than a low entry price. Read the Braze comparison, Braze alternatives and Braze pricing notes before you renew on habit.

2. Airship

Best for: Enterprise mobile teams that rely on Live Activities, push and wallet-style messages, and expect a sales-led contract.

Pricing: Not published. Airship Experience Platform is quote-based, with "get a quote" and "book a meeting" buttons. Airship Essentials has a self-service sign-up with no published price.

The platform lists email, SMS, RCS, MMS, push, web notifications, mobile wallet, and app and web experiences. For iOS Live Activities, the Push API can start, update and end an activity, and push-to-start needs iOS 17.2 or later. Its SDK list includes Apple, Android, Flutter, React Native, Capacitor and Unity.

Where it falls short: Price and packaging stay hidden until a sales call, and the pricing page does not list what Essentials includes. Ask for that in writing.

Verdict: Strong for mobile-first enterprise teams with Live Activities on the roadmap. Too heavy for a team sending a few push notifications a week.

3. MoEngage

Best for: Mobile and web brands with large monthly user counts that want push, in-app messages and email under one contract.

Pricing: Sales-led, with no dollar amounts on the pricing page. Plans are Growth and Enterprise, organized around Monthly Tracked Users, and no MTU tiers or free tier are published.

Growth and Enterprise include mobile and web push, email, SMS, in-app messages, on-site messages and webhooks. Cards, Personalize and connected channels such as WhatsApp, RCS, Line, Viber and Telegram are add-ons, so the add-on list sets the real price. The SDKs cover Android, iOS, web, React Native, Flutter, Cordova, Capacitor, Expo and Unity.

Where it falls short: Add-ons decide the bill, and they are easy to underestimate. MoEngage's docs also say push amplification is not available in the native iOS SDK.

Verdict: A serious enterprise option for consumer apps with large audiences. See the MoEngage comparison.

4. CleverTap

Best for: Consumer apps that price on monthly active users and want push, in-app messages, web push and an app inbox in one platform.

Pricing: Mixed. Core has a published price of $85 a month, taxes excluded, on a tier selector that starts at up to 5,000 MAU. The page does not say which tier the $85 covers. Pro and Ultimate show only a demo button. AI features are metered separately with CleverAI Tokens. There is no permanent free plan, but Core has a 30-day trial.

The SDKs cover Android, iOS, Flutter, React Native, Web, Unity, Cordova and an Expo plugin. Its web push supports VAPID from Web SDK 1.1.0.

Where it falls short: Pro and Ultimate are quote-only, email and WhatsApp are paid add-ons, and RCS is not on Core. Confirm which channels your tier includes before you sign.

Verdict: A solid consumer-app platform with a published entry point, which most enterprise rivals do not offer. See the CleverTap comparison.

5. Insider

Best for: Large retail and consumer brands that want commerce data, personalization and app messaging under one enterprise contract.

Pricing: Not published. Insider's own pages describe the pricing basis three ways: monthly active users, the volume of sent emails or SMS, or custom pricing based on features, channels and data volume. Get the basis in writing before you compare quotes.

Insider also claims WhatsApp, RCS and app push come with the platform at no extra platform cost. That is a vendor statement, so put it in the contract. Its Android and iOS SDKs cover push notifications and in-app messages, with React Native and Flutter integrations as well.

Where it falls short: No public price. Insider's own buyer material says very small teams with simple use cases may find its capabilities more than they need.

Verdict: Credible for enterprise retail and consumer brands with a data team. Overkill for onboarding emails in a SaaS product. See the Insider comparison.

6. Bloomreach

Best for: Retail brands with a large catalog, where personalization across web, app and email is the job.

Pricing: Contact sales. Bloomreach's only published number is a starting floor of $60K a year for smaller brands. The contract is annual, and usage such as messages sent and searches served can be billed above the expected volume. There is no free tier, and the page says it is probably not a fit if you want a free tool or a lightweight email platform.

Bloomreach lists email, SMS, RCS and WhatsApp, web and app personalization, and a mobile app channel with push and in-app messages. Its SDKs cover iOS, Android, React Native, Flutter, Xamarin and MAUI. In-app messages need your Customer Success Manager to enable them.

Where it falls short: The floor rules out most startups and many mid-market teams, and mobile is secondary to the commerce stack.

Verdict: Pick it for catalog-heavy retail personalization. Read the Bloomreach comparison and Bloomreach alternatives before you accept the floor.

Mid-market teams

7. Iterable

Best for: Growth teams with marketing operations that send across email, push, in-app, SMS and WhatsApp, and want experiments on each channel.

Pricing: Not published. The public pages show "Book a demo" and "Contact Sales" with no price, no plan names and no free tier, and they do not state a pricing unit. Get a quote that names the unit and the channels.

Iterable's product overview lists email, embedded messages, in-app messages, push, RCS, SMS, web push and WhatsApp. Experiments cover email, SMS, push, in-app and web push, but not RCS, WhatsApp or embedded messages. The SDKs cover iOS, Android and React Native, with an Expo plugin. Its docs say to set up push even if you only plan to send in-app messages, because the silent push is how the app learns a message is waiting.

Where it falls short: Pricing stays hidden until a sales conversation, and the platform assumes marketing operations capacity.

Verdict: Strong for mid-market teams with channel experiments on the roadmap. See Iterable, Iterable alternatives and Iterable pricing.

8. Customer.io

Best for: Product-led SaaS and consumer apps that send event-driven messages and want email, push and in-app messages in one builder with profile-based pricing.

Pricing: Published. Essentials starts at $100 a month billed monthly for 5,000 profiles. The table shows $145 at 10,000, $235 at 20,000, $325 at 30,000, $415 at 40,000 and $505 or more at 50,000. Extra profiles cost $0.009 each. Essentials includes 1 million emails a month. Premium starts at $1,000 a month billed yearly, and Enterprise is quoted. AI credits are billed on top.

There is no permanent free plan. There is a trial with no stated length, and a Startup Program that gives companies that raised under $10M a free year. Push and in-app messages are unlimited on all plans. SMS is custom-priced, and WhatsApp and LINE are native. The mobile SDKs cover iOS, Android, React Native, Flutter and Expo.

Where it falls short: No native web push. Its documentation supports push for mobile apps only, and the workaround routes through webhooks to Airship or OneSignal. Its in-app messages do run on the web through a JavaScript snippet, which covers on-site messages but not browser push.

Verdict: A strong fit for event-driven product teams that want published profile pricing. See the Customer.io comparison, Customer.io alternatives and pricing.

9. Klaviyo

Best for: Commerce brands whose lifecycle messaging runs on store data and who want mobile push and in-app forms beside email and SMS.

Pricing: Priced on active profiles. The free plan covers up to 250 active profiles, 500 email sends a month and $5 of mobile messages. Going over the limits can pause sending until the next cycle or an upgrade.

Klaviyo's developer documentation says its iOS, Android, React Native and Flutter SDKs cover push notifications and in-app forms. In-app forms need push set up first, and event triggers fire only from events sent through the SDK.

Where it falls short: Push and in-app sit inside a commerce product, so profile and send limits drive the cost more than the channel does.

Verdict: The right pick if the store is the source of truth and push is a supporting channel. See the Klaviyo comparison, Klaviyo alternatives and pricing.

10. Intercom

Best for: SaaS teams whose support inbox is the center of customer conversation, and who want in-app messages and product tours beside it.

Pricing: Seats plus usage. Essential is $29 per seat a month, Advanced $85 and Expert $132. Those seat prices appear to be annual rates, since the page has monthly and annual toggles. Fin, the AI agent, is from $0.99 per outcome. Pro starts at $100 a month, and Proactive Support Plus is $99 a month for 500 messages. There is no free plan and there is a 14-day trial. Startups can get up to 93% off plus a year of Fin free through its Early Stage program.

Free on all plans: live chat, support email, in-app chats, banners and tooltips. Only on Proactive Support Plus: product tours, surveys, mobile push, carousels, in-app messages, checklists and series campaigns. Email campaigns, SMS, WhatsApp and phone are pay-as-you-go.

Where it falls short: Mobile push and most in-app campaigns cost extra. It is a support suite first and an engagement platform second.

Verdict: The right call if support already runs in Intercom. Wrong for push-led lifecycle messaging at scale. See the Intercom comparison, Intercom alternatives and pricing.

Startups, SaaS and lean teams

11. OneSignal

Best for: Startups and small apps that need reliable mobile and web push, with a free tier that covers early traffic.

Pricing: The Free plan is $0 and includes 10,000 email sends a month, unlimited mobile push, in-app messages and Live Activities for organizations up to 1,000 MAU, and web push up to 10,000 subscribers per send. It caps you at 3 active journeys and 6 segments. Growth starts at $19 a month and includes 20,000 free email sends, then $1.50 per 1,000. Mobile push costs $0.012 per MAU and web push $0.004 per opted-in subscriber. Professional and Enterprise are custom. SMS and RCS are priced through sales.

The SDKs cover Android, iOS, Unity, React Native, Flutter and Cordova. Live Activities work through its setupDefault method on iOS SDK 5.2.0 or later.

Where it falls short: WhatsApp is not on its pricing page, free-tier journeys are small, and SMS needs a quote.

Verdict: A strong start for mobile and web push on a small budget. Once you need multichannel journeys on a shared profile, it stops being the whole answer. See the OneSignal comparison, OneSignal alternatives and pricing. For push-only shortlists, see best push notification services.

12. Sequenzy

Best for: SaaS, apps and lean teams that want email, push, in-app messages and SMS as steps in one sequence builder at a published price.

Pricing: Billed by emails sent, with unlimited contacts. The Free plan includes 2,500 emails a month. Paid plans are $19 a month for 15,000 emails, $29 for 60,000, $49 for 120,000, $99 for 300,000, $199 for 600,000 and $349 for 1.2 million, with custom plans above that. Push and in-app messages are unlimited on every plan, including Free, and do not use email credits. SMS/MMS is a paid add-on from $16 a month for 1,000 credits, and it needs a paid plan or SMS credits. The comparison assumption is about 60,000 emails a month for 10,000 contacts, which is $29 a month.

Channels: Email, web push, iOS push (APNs), Android push (FCM), in-app messages, content cards, iOS Live Activities and SMS/MMS, all in one sequence builder. In-app messages and content cards are "Show In-App" steps, and content cards stay in the app's feed until dismissed or expired. The SDKs are iOS (Swift Package Manager), Android (com.sequenzy:sequenzy-android), React Native (@sequenzy/react-native, which runs in Expo Go) and Flutter (sequenzy_flutter). Live Activities start, update and end from your backend through the API, CLI or MCP server.

Where it falls short: No WhatsApp, live chat, chatbots, product tours or two-way SMS inbox. SMS replies forward to email. The ecosystem is smaller than Braze or Iterable, and there is no enterprise experimentation suite.

Verdict: Right for a lean team that wants email, push, in-app and SMS in one sequence on a published bill. Wrong if WhatsApp, product tours or a staffed SMS inbox are the job. See the SMS feature page, the automation builder and the pricing page. SDK setup is in the mobile SDK docs.

How to choose

Start with the channel you cannot do without, then the pricing unit you can predict, then the team you have.

• Enterprise scale, several regions, budget for quotes: Braze, Airship, MoEngage, CleverTap or Insider. Get the same written quote from each.
• Catalog-heavy retail: Bloomreach or Insider, with Klaviyo if the store is the data source and push is secondary.
• WhatsApp is required: Braze, Iterable, Customer.io, Bloomreach or Insider. MoEngage offers it as an add-on. Sequenzy does not offer it.
• Marketing operations team running experiments on every channel: Iterable.
• Event-driven product messages on people-based pricing: Customer.io.
• Push and web push with a free start: OneSignal.
• Support inbox first, messages second: Intercom.
• Email, push, in-app and SMS as steps in one sequence on a lean budget: Sequenzy.

Other categories have different winners. If you only need push, use best push notification services. If email and push are the only channels you need, use best email and push notification platforms.

Get every quote in the same unit, with the same channels and the same volume. A quote you cannot compare is a quote you should not sign.

Frequently asked questions

What is a customer engagement platform?

A customer engagement platform sends messages to people who use your product, and it chooses each message from what they do: a sign-up, a purchase, a feature they never touched, a long gap since their last visit. It sends across several channels, usually mobile push, in-app messages and email, and it stores the events that drive the next message. Compared with an email service provider, it also owns the app side: device tokens, in-app surfaces and mobile events.

What is the best customer engagement platform?

There is no single winner. For large consumer apps that need many channels under one contract, Braze is the usual shortlist pick. For startups that need push on a free tier, OneSignal. For lean SaaS teams that want email, push, in-app and SMS in one sequence, Sequenzy. For mid-market teams with marketing or product owners who run experiments, Iterable or Customer.io. Choose by channel, buyer size and pricing unit before you choose by brand.

How is a customer engagement platform different from a CRM, an ESP or a CDP?

A CRM records accounts, deals and support history for the people on your team who talk to customers. An ESP sends email, and many stop at the inbox. A CDP collects and unifies customer data, then sends it to other tools, often without sending the message itself. A customer engagement platform runs the messages across channels. It needs the clean data a CDP provides and the device access an ESP lacks.

How much does a customer engagement platform cost?

Expect two lines: a platform fee and usage. Usage is billed by monthly active users, profiles or contacts, sends, or credits, and the unit decides what a growing app pays. Braze, MoEngage, Airship, Insider and Bloomreach quote a price rather than publish one. Published examples run from OneSignal's free tier to Customer.io at $100 a month for 5,000 profiles. Bloomreach states a floor of $60K a year for smaller brands.

How hard is it to implement a customer engagement platform?

The license is the smaller cost. The real cost is engineering time: an SDK in each app, user identity, event tracking, push tokens, APNs and FCM setup, and often a Notification Service Extension for rich images on iOS. Get identity and events right first, because every channel depends on them.

Does Sequenzy send WhatsApp messages or product tours?

No. Sequenzy does not offer WhatsApp, live chat, chatbots, product tours or a two-way SMS inbox. If you need WhatsApp, look at Braze, Iterable, Customer.io or Insider. If you need product tours, look at Intercom or a dedicated in-app tool.

Related resources

• Best push notification services
• Best in-app messaging tools
• Best iOS Live Activities tools
• Best email and push notification platforms
• Best email and SMS marketing platforms
• Best lifecycle marketing email tools
• SMS and MMS in Sequenzy
• In-app messages in the Sequenzy docs