Cross-platform mobile apps help Sydney businesses reach iOS and Android users faster, without splitting effort across two codebases. This article profiles six local and global agencies known for delivering that kind of work.
It breaks down what each company does, from product discovery and UX planning to engineering, testing, and launch support. You will also learn where they stand out, such as speed, industry focus, or technical depth in React Native, hybrid, or native builds.
Use these notes to match an agency’s strengths to your timeline, budget, and product goals. Each section ends with a use case to guide choice.
Appello Software
Appello Software is an app development company based in Sydney, Australia. The team supports the full app journey, from early product strategy and UX/UI planning through engineering, testing, store submission, and post-launch support.
The offering spans native iOS and Android builds, plus cross-platform options where speed and shared code matter. Work is structured around building clear, usable experiences that perform well across devices and operating systems.
Key Services by Appello Software
- Full mobile delivery across platforms. Projects can be built for iOS, Android, or as cross-platform apps, depending on product goals and target users.
- Product strategy and design included. The workflow starts with discovery, scope definition, and UX/UI design, so the build aligns with user needs and business use cases.
- Native iOS engineering in Swift and SwiftUI. iOS work is delivered with modern Apple tooling for performance and long-term maintainability.
- Quality assurance and release management. Testing is baked into delivery, followed by App Store submission support to move products into production smoothly.
Strengths of Appello Software
Appello Software’s main strength lies in its full-cycle software development model for mobile products. Strategy, design, engineering, QA, and launch support are handled in one stream, which helps avoid gaps between planning and delivery.
The team’s platform range is another advantage. Clients can choose native routes for maximum device performance or cross-platform builds for broader reach with shared code.
Best Use Case for Appello Software
Appello Software is best for teams that need a mobile product built through disciplined software development, with clear ownership from concept to release. Startups and scaleups launching a first app benefit from having a product strategy and UX/UI handled alongside engineering. Established businesses also fit well, especially when they need enterprise mobile apps, e-commerce experiences, or integrations with existing systems.
Overall, AppelloSoftware fits organizations that want mobile work done as a single, connected process and that value reliable design, testing, and long-term support as part of the build.
Appetizer
Appetizer is a company created by entrepreneurs who understand what other entrepreneurs need. They provide outstanding mobile app development from their offices in Melbourne, Sydney, New York, and Singapore with a talented team of over 200 experts.
Key Services by Appetizer
Appetizer provides these detailed development solutions:
- They build iOS apps using SWIFT to create faster, secure applications
- Their Android development uses Google’s best programming language
- They use data to drive smart decisions
- The team works in six-week agile development cycles
- You get business mentorship along with technical development
Strengths of Appetizer
Their Baseplate technology stands out as a multimillion-dollar investment in standard libraries that cuts development time in half compared to others. This smart approach helped Good Empire launch its product in just four months. The design team’s work ranks 9th worldwide.
The developers at Appetizer represent the top 1% of global talent and come from leading tech companies. Their clients have generated more than $100 million in revenue through their apps.
Best Use Case for Appetizer
Startups looking to enter the market quickly will find great value in Appetizer’s services. A great example is Dimers, a sports prediction app that reached over 1 million page views and hundreds of thousands of users within 30 days of launch. The company works best with entrepreneurs who want both technical expertise and business guidance.
7 Pillars
7 Pillars, a 5-year-old Melbourne company, creates custom mobile applications that deliver measurable business growth. The team turns ideas into user-friendly applications by building meaningful client relationships.
Key Services by 7 Pillars
7 Pillars provides complete development solutions:
- Android app development with optimal performance and stability
- iOS app development with exceptional user experience
- React Native development for cross-platform solutions
- AI application development with improved interfaces
- Blockchain applications that boost security
- UX/UI design that focuses on user involvement
Strengths of 7 Pillars
7 Pillars uses an accessible approach and involves clients in developing solutions that fit specific needs. The team continues support after launch and provides four months of free security updates. Each project gets a dedicated team of professionals who bring unique expertise to create original solutions.
Best Use Case for 7 Pillars
7 Pillars stands out with businesses that want to scale and secure funding. The company delivers results, especially when you have AI-driven projects that need tailored solutions and improved efficiency. Their expertise shines in developing blockchain applications that need better security and lower costs.
Designpluz
Designpluz has grown into Sydney’s top digital transformation agency since 2008. The company employs more than 50 skilled professionals who bring 17+ years of experience to every project.
Key Services by Designpluz
- iOS and Android mobile app development (20% of services)
- E-commerce and web development (40% combined)
- Custom software and SaaS development
- UI/UX design and branding solutions
Strengths of Designpluz
The company sets new standards of excellence through its complete creative approach. Their cloud-based setup helps optimize apps and reduce operational costs. The team starts by creating user stories to define project scope. They follow this with the AGILE methodology that includes regular client feedback.
Best Use Case for Designpluz
The company shines at building cloud-native web applications that replace legacy systems. Their project with Tax Today showed how they rebuilt systems to create smooth operations across branches and cut IT costs substantially. This makes them perfect for businesses that need digital transformation with clear ROI potential.
Zealous System
Zealous System helps Sydney businesses transform their app ideas into reality as a leading offshore software development company. Since 2008, they have earned recognition for delivering quality work and exceptional customer service.
Key Services by Zealous System
Their detailed mobile solutions include:
- iOS and Android native development
- Hybrid mobile applications
- Progressive web app development
- Cross-platform solutions
- Wearable app development
- Enterprise mobility solutions
Strengths of Zealous System
The core team of 100+ expert developers consistently delivers high-quality projects on schedule. Their agile development approach adapts to changes and includes regular project reviews. Clients love their round-the-clock availability and quick response time within 24 hours.
Best Use Case for Zealous System
Zealous shines in creating educational applications that make learning available and interactive. The team has built successful healthcare apps, digital wallet platforms, and bidding web applications for machine parts. Their AI expertise adds individual-specific experiences and predictive features to apps.
Chirpn
Chirpn stands out as an AI-first technology services company that streamlines product development with advanced algorithms to create market-ready solutions.
Key Services by Chirpn
Chirpn provides these complete digital solutions powered by artificial intelligence:
- Product & platform development
- Enterprise platform implementation
- AI & machine learning integration
- API & system integrations
- Data & analytics
- Support services
The team has launched over 50 products and platforms within 45-60 days, which shows their remarkable development speed.
Strengths of Chirpn
Simplicity, passion, curiosity, collaboration, perseverance, and ingenuity are the foundations of Chirpn’s success. The company’s AI-first philosophy runs deep; they exploit artificial intelligence to optimize scope and create iterative, market-responsive solutions.
Their AutoPATH framework works as a force multiplier throughout the software development lifecycle and speeds up project delivery. The company’s expertise in cloud computing services and IT security adds significant value to its solutions.
Best Use Case for Chirpn
Startups and scale-ups looking for rapid MVP development find great success with Chirpn, which launches functional products in just 90 days. The company also helps enterprises modernize legacy systems through AI integration. Their cross-functional experience spans industries from healthcare to education.
Final Words:
Picking a cross-platform partner is less about hype and more about fit. Appello Software and Appetizer bring full-cycle delivery with strong startup support. 7 Pillars and Designpluz add depth in UX, cloud, and emerging tech for firms scaling products. Zealous System offers large-team offshore execution with broad app types. Chirpn leans into AI-led scoping and rapid MVP timelines. Across all six, look for clear discovery, transparent agile communication, and testing baked into the build.
Align their typical projects with your users, compliance needs, and long-term maintenance plan. The right match will shorten iterations and save rework when the app grows later.
