iOS 18 Lessons for App Developers & Designers: Preparing Your Product for iOS 19

May 2025

The annual iOS update cycle presents both challenges and significant opportunities for businesses with digital products. While iOS 18, released in late 2024, introduced foundational shifts, the recent iOS 18.5 update (released May 12, 2025) reminds us of iOS’s constant evolution, focusing on refinements, security patches, and specific enhancements like expanded satellite connectivity for iPhone 13 models.

However, the real strategic focus for app developers and designers is already shifting toward iOS 19, which is anticipated for preview in June 2025. Industry analysis and reports suggest major changes, including a comprehensive design overhaul and significant advances in AI capabilities. 

How can businesses prepare? By understanding the strategic impact of the groundwork laid by iOS 18. At InspiringApps, we specialize in helping companies navigate these platform shifts, meticulously analyzing Apple’s trajectory from each Worldwide Developers Conference. Our ongoing coverage, including insights from WWDC 2024 on Apple’s AI advancements and earlier reflections from WWDC 2023 on the evolution of features like widgets, gives us a deep understanding of these platform evolutions.

This post dives into five key foundational features from iOS 18, analyzing their strategic impact and how leveraging them now positions your app for success in the upcoming iOS 19 era. Let’s begin with Apple’s most significant AI push to date: Apple Intelligence.

iPhone screen displaying keyboard with contextual suggestions for actions like directions, music, and sharing ETA, demonstrating Apple Intelligence capabilities.

1. Apple Intelligence

Let’s talk about the elephant in the room: Apple Intelligence. While Apple’s been rolling out these features slowly (Genmoji, writing tools, enhanced Siri), user reactions have been mixed. Some feel they’ve received “basically nothing“ from iOS 18’s AI promises, with key features delayed potentially until iOS 19. The reality? These AI capabilities are still limited to iPhone 15 Pro and newer models, and Apple’s incremental rollout strategy means we’re all still waiting to see the full picture.

Current State & Developer Focus

From what we’re seeing, businesses need to prepare for evolving Apple Intelligence features. Apple’s gradual rollout across multiple updates means your development strategy needs to be flexible. Focus on the features that are actually available now—writing tools, notification prioritization, and the enhanced Mail app with smart categories—rather than banking on capabilities that might not arrive until iOS 19.

User Engagement Strategy

While AI features mature, plan how your app will capitalize on user engagement once these capabilities become more widely available. Consider creating experiences that can benefit from AI-powered personalization, intelligent content suggestions, or automated workflows that will resonate with users as Apple’s AI ecosystem expands.

Competitive Edge

Businesses whose apps tap into Apple Intelligence effectively can offer unique, powerful features that competitors without deep OS integration may lack. This could be a competitive differentiator, particularly for productivity or creative apps.

Product owners should explore potential AI use cases relevant to their app’s core function. Design teams need to consider how AI output is presented and managed. Developers must focus on secure and efficient integration of AI models and APIs, respecting user privacy and personal context. In our deeper look at Apple Intelligence, we explore practical AI use cases for businesses.

Design Challenge

The key challenge involves integrating AI into your interface without overwhelming users. Clear communication of AI capabilities and limitations is essential to building user trust while maintaining a clean, intuitive experience.

iOS 19 Preparation

iOS 19 is expected to significantly expand Apple Intelligence capabilities and Siri’s intelligence, including potential onscreen awareness (understanding what’s displayed) and deeper cross-app integration. Integrating Apple Intelligence into your app in iOS 18 positions your app to immediately tap into these more advanced, context-aware AI features as they become available in iOS 19, enabling more sophisticated automations and personalized experiences. This builds a foundation for future AI-centric features anticipated in iOS 19 and beyond.

Three iPhones demonstrating various customized Control Center layouts in iOS, highlighting movable and resizable controls for personalization.

2. Extensive Customization of Home Screen & Control Center

Remember when iOS 14 introduced widgets? This is that moment, but on steroids. Users can now put apps literally anywhere on their screen, tint everything purple if they want, and completely rebuild their Control Center. We’ve seen users create “work mode“ and “personal mode“ layouts that fundamentally change how they use their phones.

User Engagement

Widgets significantly increase user personalization and control over their primary iPhone interface. If apps offer valuable widgets and Control Center controls tailored to user needs, this can lead to higher engagement.

Development Effort

Creating flexible widgets demands development effort to ensure they look good at different sizes and support icon tinting. Implementing Control Center modules requires specific development attention.

Design Impact

Create widgets and Control Center controls that remain functional across different sizes, layouts, and color schemes. This means designing for modularity and theme-adaptability from the outset, ensuring brand consistency even when users apply custom tints or resize elements. The challenge is to offer meaningful utility while respecting the user’s personalized aesthetic.

Competitive Edge

Well-designed widgets and Control Center controls increase accessibility and user engagement with your app.

Product owners and design teams should identify key app functionalities or information that users would want quick access to (via widgets or controls). Developers must implement the necessary frameworks to support these new customization options.

iOS 19 Preparation

iOS 19 is rumored to feature a major design overhaul, potentially adopting a visionOS-like aesthetic with translucency and rounded/floating elements. By developing modular, flexible UI components and implementing support for iOS 18’s customization features (like adaptable widgets and Control Center modules) now, businesses create UI assets and structures that are inherently more adaptable to potential visual redesigns or new layout paradigms anticipated in iOS 19. This strategic focus on UI flexibility prepares your app for potential foundational design shifts.

Close-up of iPhone Photos app 'Customize & Reorder' screen, showing options to personalize and pin photo collections like Recent Days and People & Pets.

3. Major Redesign of the Photos App

iOS 18 includes the “biggest redesign ever“ of the Photos app, focused on making the library more organized and easier to navigate. It introduces automated “Collections“ (like days, people, trips) and allows users to customize and pin their favorite collections.

User Engagement

Improves photo library navigation. Apps that interact heavily with user media (social media, photo editing, cloud storage) are directly affected.

Development Effort

Requires ensuring compatibility with the new Photos library structure and potentially updating how apps access, import, or export media. Integrating with new features like “Collections“ might require development effort if relevant to the app’s functionality.

Design Opportunities/Challenges

Design should consider how the app’s photo-related features align with the new Photos app layout and organization. The challenge involves providing a seamless experience when interacting with the user’s media, regardless of the new app structure.

Competitive Edge

Apps that integrate smoothly with the redesigned Photos app and potentially tap into features like Collections for their own functionality (if APIs are available) could offer a superior user experience.

Product owners and design teams should understand the new photo management paradigms and how users will interact with their media. Developers must test compatibility and update Photos framework usage to ensure smooth performance and access to the library.

iOS 19 Preparation

While specific Photos features aren’t confirmed for iOS 19, the expected system-wide design overhaul will likely affect all core apps. Building robust photo interactions now creates a stable foundation for future UI changes.

iPhone Messages app showing new animated text effect suggestions such as 'Big' and 'Shake' appearing above the keyboard, enhancing expressive communication.

4. Significant Enhancements to the Messages App (Including RCS Support)

The Messages app gains new ways to express text (animated effects), the ability to Tapback with any emoji or sticker, and, importantly, support for RCS (Rich Communication Services) for improved communication with users on other platforms (like Android). RCS brings features like richer media support, delivery, and read receipts.

User Engagement

Enhancements like animated text and expanded Tapback options encourage more expressive communication. RCS support is highly relevant for businesses using SMS/messaging for customer interaction (e.g., sending confirmations, alerts, marketing messages). It enables richer, more reliable communication with a broader audience.

Design Opportunities/Challenges

Opportunities exist to design more engaging messaging content or interactions. The challenge for RCS is less about design and more about ensuring technical compatibility and leveraging the enhanced capabilities for business-to-consumer communication.

Competitive Edge

Businesses that adopt RCS can offer a more modern and reliable messaging experience to non-iPhone users, improving customer communication compared to relying solely on basic SMS.

Here’s what nobody’s talking about: RCS isn’t just about better Android messaging. For businesses sending transactional messages (think order confirmations, appointment reminders), RCS means you can finally send rich media, track delivery properly, and know when messages are read, even to Android users.

Product owners should assess how RCS support impacts their messaging strategy and customer communication workflows. Developers need to understand the technical implications of RCS compatibility and potentially integrate with new messaging features offered by iOS 18.

iOS 19 Preparation

While the provided sources don’t specify new Messages features for iOS 19 (beyond the general design overhaul, possibly affecting its appearance), the strategic importance of cross-platform communication via RCS established in iOS 18 is likely to continue and potentially expand. By ensuring robust support for RCS and leveraging iOS 18’s messaging enhancements now, businesses align with Apple’s direction for improved cross-platform messaging, positioning themselves well for any further messaging API developments or integrations that might come with iOS 19.

Phone displaying the main interface of the new dedicated Passwords app, organizing credentials like passwords, passkeys, and verification codes.

5. Introduction of the Dedicated Passwords App

iOS 18 introduces a standalone Passwords app that consolidates and securely stores user credentials, including passwords, passkeys, verification codes, and security alerts. It features end-to-end encryption and seamless syncing across devices.

User Engagement

Improves user security and simplifies the login process. Users have a central, trusted place to manage their credentials, reducing reliance on less secure methods.

Development Effort

Requires development effort to implement support for Passkeys (a core part of modern credential management integrated with this app) and ensure seamless integration with iOS’s AutoFill features.

Design Opportunities/Challenges

Design should guide users toward utilizing secure login methods like Passkeys and AutoFill via the Passwords app, simplifying the authentication flow. The challenge involves ensuring a smooth user experience, especially during onboarding or credential recovery.

Competitive Edge

Apps that fully embrace and implement modern, secure authentication methods like Passkeys via the Passwords app offer a more secure and convenient experience compared to those relying solely on traditional password entry.

Product owners must prioritize implementing robust and user-friendly authentication methods, particularly Passkeys. Developers need to integrate with the iOS credential management APIs and ensure secure handling of user data.

Supporting the iOS 18 Passwords app and Passkeys builds on Apple’s latest security foundation, positioning your app to benefit from future authentication improvements in iOS 19 and beyond.

Three iPhone mockups displaying Apple Intelligence features, Writing Tools in the Notes app, and Siri suggestions for various tasks, hinting at future OS capabilities.

Latest iOS 18.5 Update & The Road to iOS 19

While the foundational shifts came with iOS 18, the recent iOS 18.5 update provides valuable context. As expected for a mid-cycle release, it’s relatively minor, focusing on stability, security (30+ vulnerabilities patched), and targeted tweaks like refining the Mail app UI and expanding carrier-provided satellite features to iPhone 13 models. For businesses, this highlights the ongoing need for compatibility testing and prioritizing security updates.

However, the real buzz, reflected in rapidly rising search trends, surrounds iOS 19. Here are the key strategic implications businesses should consider based on current rumors:

Design Overhaul (visionOS-like)

Smarter Siri (LLMs)

Stage Manager for iPhone

If Stage Manager comes to iPhone, apps will need to adapt to potential windowed interfaces and multitasking paradigms. This could particularly impact productivity and professional apps that benefit from split-screen functionality. Consider how your iOS app strategy might need to evolve to support more desktop-like workflows on mobile devices.

iPadOS Productivity & Multitasking Improvements

Enhanced iPadOS multitasking capabilities might create expectations for similar functionality in iPhone apps. Design teams should explore how mobile app design trends might shift toward more flexible, productivity-focused interfaces that can scale across Apple’s ecosystem.

Frequently Asked Questions (for App Dev/Design Leaders)

We often get questions about navigating iOS updates. Here are answers to common queries, framed for businesses and development teams:

What was new in the major iOS 18 update (from a business perspective)?

iOS 18 introduced several features with significant business app iOS compatibility implications:

What are the features of the latest iOS 18.5 (relevant to businesses)?

iOS 18.5 delivered bug fixes, performance improvements, and specific feature tweaks with business relevance:

What are the key security features of iOS 18 (for app data & user trust)?

iOS 18 introduced several security and privacy features impacting how apps interact with user data:

Apple’s approach to privacy with AI is a key consideration we discuss further in our analysis of Apple Intelligence for businesses.

Which iOS versions are supported (and what are the strategic implications)?

The compatibility information for iOS 18 and rumored iOS 19 has significant strategic implications:

Analyzing your current user base’s device distribution is key to making strategic choices about iOS support. Setting minimum OS targets requires balancing reach versus leveraging the latest features. Comprehensive testing is needed across all supported iOS versions and hardware.

Overhead view of a collaborative meeting with an iPhone at the center, surrounded by hands, a notepad, and coffee, symbolizing strategic planning for app development.

Conclusion: Strategic Preparation for iOS 19

Based on patterns we’ve observed through previous major iOS transitions, particularly the iOS 7 redesign, early preparation provides significant advantages. The five features we’ve analyzed represent key areas where businesses can build competitive differentiation while preparing for the anticipated iOS 19 changes.

Our recommended approach is methodical: Select the iOS 18 features most relevant to your users’ needs and implement them thoughtfully. This positions your app to benefit from new capabilities as they emerge while maintaining stability for your existing user base.

As iOS 19 approaches with its rumored design overhaul and expanded AI capabilities, the apps best positioned for success will be those that have already integrated iOS 18’s foundational elements. The transition becomes an evolution rather than a disruption. For developers looking to dive deeper into the latest SDKs and design guidelines, Apple’s official iOS developer portal is an essential resource.

Ready to develop a strategic iOS roadmap for your application?

Contact InspiringApps to discuss how we can help position your app for sustained success through the iOS 19 transition and beyond.

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