In-App Messaging

In-app messaging refers to communication that happens directly on a website, mobile app, or any other digital platform. Users don’t need to leave the product or service or switch to an external app to participate in this communication. The term is used in two ways across the industry; both share the same core benefit: keeping users engaged and communicating within the product:

Broadcast in-app messaging — one-way messages a product sends to users (banners, tooltips, popups) for onboarding, announcements, or promotions. This is the definition used by product-marketing tools.
Conversational in-app messaging — two-way, real-time chat between users, or between users and support/AI agents, embedded natively in the platform. We focus on this second meaning, covering public chat, private chat, support chat and other forms of communication with the platform side, and messaging with AI bots.

Types of In-App Messaging

1. Public chat (or community chat)

A chat conversation which is visible to all users. It is usually linked to shared content, events, or interests.

Features: Threads, reactions, stickers, replies, pinned messages, etc.

Use case: Sports fans discuss a live match; viewers comment on an event in real time.

2. Private Chat

One-to-one or small group conversations, not visible to a broader community. Often available via the invitation link.

Features: Same rich messaging tools as public chat, scoped to a limited set of participants; no extra development is typically needed beyond the public chat infrastructure.
Use case: Chat for a challenge on a fitness app, a private event, or winners of the competition.

3. Support Chat

A chat built specifically to resolve user issues.

Features: Can be handled by a human agent, an AI agent connected to a knowledge base or CRM, or both.

4. AI Bot Messaging

Public or private chat with a conversational AI agent that keeps the context.

Features: Users typically ask a question and get an AI-generated reply drawn from a platform-specific knowledge base (e.g., sports stats, technical answers, film recommendations).

Integration Methods

Conversational in-app messaging is typically integrated into an existing website or mobile application rather than delivered as a separate product. The integration method determines how the messaging interface is displayed, how closely it is connected to the host product, and how much development effort is required.

Several approaches can be used to embed messaging into a host platform:

iframe embedding — web: The messaging interface is loaded inside an HTML <iframe> within an existing webpage. This is one of the simplest web integrations because the chat application remains technically separate from the host website while appearing as part of the same interface. The host platform can usually control the room, user context, layout, and other settings through URL parameters or communication mechanisms such as postMessage. The main limitation is that an iframe has less direct access to the surrounding page, so deeper UI or navigation integration may require additional communication between the host page and the embedded chat.
WebView — iOS and Android: A WebView is an in-app browser container that displays the web version of the messaging interface inside a native mobile application. From the user's perspective, chat appears to be part of the app, while the messaging UI can still be developed and updated using web technologies. The native application can pass information such as authentication tokens, room IDs, or user settings into the WebView and communicate with it through a JavaScript bridge. WebViews reduce the need to build separate native chat interfaces for iOS and Android, although their behaviour and performance may be less tightly integrated with the operating system than a fully native solution.

Native SDK — iOS and Android: A messaging provider may offer an SDK containing native components that developers integrate directly into the mobile application. This provides deeper access to application features such as navigation, notifications, media uploads, accessibility, and device-level functionality. Native SDKs usually offer the most seamless user experience but require more development and maintenance than a WebView-based integration.

API-based / custom interface: The host platform can use messaging APIs to build its own chat interface while relying on the messaging service for backend functionality such as rooms, messages, moderation, and user presence. This approach offers the highest level of control over UX and branding, but also requires the greatest engineering effort because the host platform is responsible for building and maintaining the frontend experience.

In practice, the choice is usually a trade-off between speed of integration and level of customisation. iframe and WebView approaches are fast to deploy and allow a single messaging frontend to be reused across platforms. JavaScript components and native SDKs enable deeper integration, while an API-based implementation gives the host platform the most control but requires substantially more development.

Configuration

When the interface is embedded, the host platform needs to tell it what context to open. Parameters such as room ID, user ID, language, theme, or interface mode can be passed through URL/GET parameters, initialisation settings, postMessage, or a native-to-WebView bridge.

This allows the host application to determine, for example, which conversation opens when a user enters a particular event page, article, livestream, or community area without requiring a separate chat-specific backend flow.

Authentication

Messaging can be connected to the platform's existing identity system through SSO, OAuth, signed tokens, or another token-based authentication mechanism. Users therefore do not need to create or log into a separate messaging account.

The host platform typically passes a verified user ID and selected profile information to the messaging service. This may include a nickname, avatar, status, or role.

APIs

APIs allow the host platform to manage messaging programmatically rather than relying only on actions performed through the chat interface.

Typical API capabilities include creating and managing rooms, retrieving message or participation counts, managing users, banning or unbanning participants, assigning roles, sending system messages, and connecting bots or automated moderation systems.

APIs are particularly important when messaging needs to operate as part of a larger product workflow—for example, automatically creating a chat room when a livestream is created, synchronising moderators with an internal user-management system, or displaying conversation activity elsewhere in the product

Moderation

Because conversational messaging can cause the risk of harassment, spam, and harmful content, moderation is built in as core infrastructure, not an add-on. A typical layered approach:

Pre-moderation — messages are checked against blocklists before they're sent.

AI moderation checks text messages and images in real time and hides or flags them based on prompts; thresholds and parameters for hiding are adjustable.

Personal data masking

Cascade re-checking — some systems re-verify messages multiple times to reduce false negatives.

User-driven moderation — users can report or hide others; trusted community members can be assigned moderator roles.

Human oversight // in-flight moderation — moderators can review flagged content, unhide false positives, or catch what AI missed, using a dashboard that logs what was hidden, when, and by whom.

Why It Matters

Conversational in-app messaging keeps users engaged within a platform perimeter instead of letting them go to external apps. That supports engagement, retention, and monetisation (see copy widgets, retention) of the hosting platform. Combining public, private, support, and AI bot messaging in one system helps a host platform meet different user needs without using third-party tools.

Read more about Chat as a Service and learn how to chose the best chat platform to integrate with