Top Swift App Development Services
Swift is Apple's primary programming language for building native apps across iOS, macOS, watchOS, and tvOS. Hiring a Swift developer means getting a team fluent in Apple's development ecosystem — from UIKit and SwiftUI for interface design to Core Data, CloudKit, and the App Store review process.
Native Swift development delivers the performance, security, and platform integration that cross-platform frameworks can't fully replicate, making it the standard choice for apps where user experience, Apple hardware features, or strict App Store compliance matter most. Clutch evaluates every Swift development firm through verified client interviews and project-level data so you can compare quality and track record side by side. Browse all native mobile options at top iPhone app development agencies, explore cross-platform teams at top mobile app development companies, or narrow to firms in your region at top U.S. Swift developers.
-
Featured
What are Featured Providers?
$5,000+$25 - $49 / hr50 - 249London, EnglandServices provided
Focus Areas
See all 92 projectsDigis, a Fiverr company (NYSE: FVRR), specializes in custom software development, offering services such as full stack and bespoke software development. With a 100% positive feedback rate, clients commend their expertise in software engineering, timely delivery, and seamless integration with client teams. Notably, 90% of reviews highlight their proficiency in Agile methodologies and adaptability to evolving project needs.
-
$1,000+$25 - $49 / hr10 - 49Kolkata, India
Services provided
Focus Areas
Small graphic design agency RSDigitX Informatics Pvt. Ltd, is headquartered in Kolkata, India. Their services include Graphic Design and Cybersecurity.
Read more -
$10,000+< $25 / hr50 - 249Heathrow, England
Services provided
Focus Areas
Established in 2004, Root Info Solutions is an e-commerce development firm. The firm offers E-Commerce Development and Mobile App Development, and is midsize.
Read more -
$5,000+$25 - $49 / hr50 - 249Pune, India
Services provided
Focus Areas
Angular Minds is a website development company. Their midsize team of employees is based in Pune, India and San Diego, California. Their team specializes in Web Development and Mobile App
Read more -
$10,000+$50 - $99 / hr10 - 49Wien, Austria
Services provided
Focus Areas
NOVISMART TECH. Is a software development company. They were established in 2013 and provide Custom Software Development and IoT development.
Read more -
$100,000+$50 - $99 / hr2 - 9Alpharetta, GA
Services provided
Focus Areas
Application development firm Online Ambassadors is based in Alpharetta, Georgia. Launched in 2012, the team specializes in Mobile App Development and Web Development.
Read more -
$25,000+$50 - $99 / hr10 - 49Sevilla, Spain
Services provided
Focus Areas
Z1 Digital Studio, an user experience design agency, was established in 2014. The company focuses on UX/UI Design and Mobile App Development, and is small.
Read more -
$50,000+$150 - $199 / hr50 - 249Indianapolis, IN
Services provided
Focus Areas
Launched in 2000, E-gineering, Inc. Is a custom software development company. The agency specializes in Custom Software Development and Web Development.
Read more -
UndisclosedUndisclosed2 - 9Bengaluru, India
Services provided
Focus Areas
Founded in 2017, Skyaltum is a social media marketing company. In Bengaluru, India, the team provides Social Media Marketing and Search Engine Optimization.
Read more -
$5,000+$25 - $49 / hr2 - 9
Services provided
Focus Areas
Application development company Faodail Technology focuses on Mobile App Development and Web Development. They were established in 2016.
Read more -
$10,000+$100 - $149 / hr2 - 9Regensburg, Germany
Services provided
Focus Areas
Appmeisterei GmbH | App Agentur is a web development company. The team provides Web Development and Mobile App Development and is headquartered in Regensburg, Germany.
Read more -
$10,000+$50 - $99 / hr2 - 9Brooklyn, NY
Services provided
Focus Areas
Intellion Inc. Is a web design company. The Brooklyn, New York-based firm was founded in 2019. Their services include Web Design and UX/UI Design.
Read more -
$1,000+< $25 / hr10 - 49Kyiv, Ukraine
Services provided
Focus Areas
Clack IT is a web development firm located in Kyiv, Ukraine. Launched in 2018, the team focuses on Web Development and UX/UI Design.
Read more -
$1,000+< $25 / hr10 - 49Vadodara, India
Services provided
Focus Areas
Custom software development firm Topnotch IT Consultant is based in Vadodara, India. The team offers Custom Software Development and Mobile App Development.
Read more -
$1,000+< $25 / hr10 - 49Edmonton, Canada
Services provided
Focus Areas
CyberMeteors is a website development firm. Established in 2019, the firm specializes in Web Development and Mobile App Development.
Read more -
Undisclosed$50 - $99 / hr250 - 999
Services provided
Focus Areas
CODITY is an IT staff augmentation company. Their midsize team is in San Salvador, El Salvador and specializes in IT staff augmentation and Web Development. The company was founded in 2016.
Read more -
$1,000+$25 - $49 / hr10 - 49pimple saudagar,Pune, India
Services provided
Focus Areas
GISKernel is a software development company. Established in 2018, the team offers Custom Software Development and Mobile App Development.
Read more -
$10,000+$25 - $49 / hr10 - 49Budapest, Hungary
Services provided
Focus Areas
Mobile application development company VividMind was launched in 2010. The small team offers Mobile App Development and Web Development.
Read more -
$1,000+$25 - $49 / hr10 - 49Bengaluru, India
Services provided
Focus Areas
HDINFOTECH is a small mobile application development firm in Bengaluru, India and Ahmedabad, India. Their services include Mobile App Development and Web Development.
Read more -
$10,000+$25 - $49 / hr10 - 49Dubai, United Arab Emirates
Services provided
Focus Areas
Bluecast Technologies is a Dubai, United Arab Emirates-based mobile application development company. They specialize in Mobile App Development and Artificial Intelligence and were established in
Read more -
$100,000+$25 - $49 / hr10 - 49
Services provided
Focus Areas
See all 1 projectsAppsPlusWeb is a next-generation technology and digital growth company helping businesses succeed in the modern AI-driven world. We specialize in AI-powered SEO, AI app development, mobile app
Read more -
$10,000+$100 - $149 / hr10 - 49Atlanta, GA
Services provided
Focus Areas
Website development firm Toolbox No. 9 is in Atlanta, Georgia. They specialize in Web Development and UX/UI Design and were founded in 2005.
Read more -
$5,000+$50 - $99 / hr10 - 49
Services provided
Focus Areas
App2U is a software development firm. The team is located in Barcelona, Spain, and their services include Custom Software Development and Mobile App Development.
Read more -
$25,000+Undisclosed10 - 49Sunrise, FL
Services provided
Focus Areas
TKLABS, Inc. Is a custom software development firm founded in 2000. The team offers Custom Software Development and Web Development and is based in Sunrise, Florida.
Read more -
$10,000+$50 - $99 / hr10 - 49Lince, Peru
Services provided
Focus Areas
Starter is an app development company. The team provides Mobile App Development and Web Development and is located in Lince, Peru.
Read more -
$5,000+< $25 / hr10 - 49Ho Chi Minh, Vietnam
Services provided
Focus Areas
Wiki Solution is a small website development firm in Ho Chi Minh, Vietnam. The team specializes in Web Development and Mobile App Development.
Read more -
$10,000+$50 - $99 / hr10 - 49Brookfield, WI
Services provided
Focus Areas
Symphony Software, a custom software development company, is in Brookfield, Wisconsin. Established in 2011, the team offers Custom Software Development and Web Development.
Read more -
$5,000+$25 - $49 / hr50 - 249Tucson, AZ
Services provided
Focus Areas
Mobile application development firm TucsonBizz is based in Tucson, Arizona. They offer Mobile App Development and Custom Software Development.
Read more -
$1,000+< $25 / hr50 - 249
Services provided
Focus Areas
ThinkBI Tech is a software development company. The team offers Custom Software Development and Mobile App Development, and the agency is located in Indore, India.
Read more -
$1,000+$25 - $49 / hr2 - 9Islamabad, Pakistan
Services provided
Focus Areas
Kivyx Technologies, a mobile application development company, was launched in 2019. The small team provides Mobile App Development and Web Development.
Read more -
UndisclosedUndisclosed10 - 49Budapest, Hungary
Services provided
Focus Areas
Established in 2014, Branditorial is an user experience design agency. The team offers UX/UI Design and Artificial Intelligence.
Read more -
$10,000+$25 - $49 / hr10 - 49Lleida, Spain
Services provided
Focus Areas
Starshot Software is a software development firm in Lleida, Spain and Nashville, Tennessee. They specialize in Custom Software Development and Mobile App Development and were launched in 2017.
Read more -
$1,000+$25 - $49 / hr10 - 49
Services provided
Focus Areas
See all 1 projectsHighQ Desk provides services in website development, game development, and video production. The overall feedback from clients highlights their timely delivery, budget-friendly pricing, and top-notch developers and animators who require minimal guidance. HighQ Desk is recognized for its effective project management and alignment with client objectives, resulting in successful project outcomes.
-
$5,000+$25 - $49 / hr2 - 9
Services provided
Focus Areas
See all 1 projectsAppè Latte specializes in designing and developing mobile applications, particularly for startups, with expertise in the iOS platform using SwiftUI. Their clients praise their transparency, passion, and commitment to exceeding expectations. Appè Latte's ability to deliver projects ahead of schedule and maintain effective communication is highly valued, making them a reliable partner for app development needs.
-
$1,000+$50 - $99 / hr10 - 49Lahore, Pakistan
Services provided
Focus Areas
DT Modern Tech is an e-commerce development firm launched in 2018. The small team focuses on E-Commerce Development and Mobile App Development.
Read more -
$5,000+$25 - $49 / hr2 - 9Montreal, Canada
Services provided
Focus Areas
Vinctus is a software development firm. Located in Montreal, Canada, the agency was established in 2017. Their services include Custom Software Development and E-Commerce Development.
Read more -
$10,000+$150 - $199 / hr2 - 9San Francisco, CA
Services provided
Focus Areas
Get It Built is an application development company established in 2017. Their team focuses on Mobile App Development and Web Development.
Read more -
$10,000+$50 - $99 / hr2 - 9
Services provided
Focus Areas
Launched in 2022, MLP Software Development is a mobile application development firm. Their team focuses on Mobile App Development and Web Development.
Read more -
$1,000+< $25 / hr10 - 49Surat, India
Services provided
Focus Areas
Small mobile app development firm 4monic, is located in Surat, India. The team provides Mobile App Development and UX/UI Design.
Read more -
$10,000+$50 - $99 / hr50 - 249
Services provided
Focus Areas
Woxo Agency is a Digital Strategy company. The team is in Istanbul, Türkiye, and their services include Digital Strategy and Social Media Marketing.
Read more -
$5,000+$25 - $49 / hr10 - 49ঢাকা, Bangladesh
Services provided
Focus Areas
Oxistech is a website development firm. In ঢাকা, Bangladesh and Houston, Texas, the company was established in 2013. Their team focuses on Web Development and E-Commerce Development.
Read more -
$25,000+< $25 / hr50 - 249Hanoi, Vietnam
Services provided
Focus Areas
Biplus Viet Nam Software Solutions JSC is a website development company in Hanoi, Vietnam. The team offers Web Development and Mobile App Development.
Read more -
$10,000+$50 - $99 / hr50 - 249Amadora, Portugal
Services provided
Focus Areas
SYONE is a midsize Amadora, Portugal-based custom software development company. Their services include Custom Software Development and Web Development.
Read more -
Undisclosed$50 - $99 / hr10 - 49
Services provided
Focus Areas
Wolf Stack is a web development firm. They are in Multan, Pakistan and Multan, Pakistan. Their team focuses on Web Development and Mobile App Development.
Read more -
$5,000+$50 - $99 / hr10 - 49Kharkiv, Ukraine
Services provided
Focus Areas
Based in Kharkiv, Ukraine, DevCottage is a Cybersecurity company. The team focuses on Cybersecurity and Blockchain.
Read more -
$10,000+$25 - $49 / hr10 - 49Kyiv, Ukraine
Services provided
Focus Areas
AltRecipe, a website development company, was launched in 2015. The team specializes in Web Development and Blockchain.
Read more -
$1,000+< $25 / hr250 - 999Irving, TX
Services provided
Focus Areas
Software development firm Kriyan Infotech is based in Irving, Texas and Ahmedabad, India. The team offers Custom Software Development and Mobile App Development.
Read more -
Undisclosed$25 - $49 / hr50 - 249
Services provided
Focus Areas
Symbels Consultancy is a mobile app development company headquartered in Patna, India and Portland, Oregon. They focus on Mobile App Development and Digital Strategy and were established in 2016.
Read more -
$1,000+$150 - $199 / hr2 - 9Mornington, Australia
Services provided
Focus Areas
Launched in 2011, ennoblir group is an artificial intelligence company. The team specializes in Artificial Intelligence and AI Consulting and is located in Mornington, Australia and Antony, France.
Read more -
$1,000+< $25 / hr10 - 49Skopje, North Macedonia
Services provided
Focus Areas
Digital Point: Nearshore Software Outsourcing Partner, a software development company, was launched in 2012. The firm focuses on Custom Software Development and Blockchain.
Read more -
$1,000+$25 - $49 / hr50 - 249Las Vegas, NV
Services provided
Focus Areas
See all 1 projectsProgneo offers comprehensive SEO services, UI/UX design, and web development. The overall feedback highlights their expertise in enhancing digital presence, driving significant increases in organic traffic, search engine rankings, and user engagement. Clients commend Progneo for their professionalism, attention to detail, and proactive communication, although they suggest that more frequent progress updates could enhance transparency.
Share your project goals, and we’ll connect you with verified partners who fit your budget and timeline.
Get My Matches
Tell us what you need — we’ll match you with top agencies in minutes.
Get My MatchesWhy Trust Clutch
At Clutch, we believe trust is the foundation of every business relationship. Our mission is to help buyers make confident, data-backed decisions informed by real client experiences.
Every review on Clutch undergoes a rigorous, human-led verification process to make sure it’s valid. Our team of specialists confirms the identity of each reviewer, ensures the project is legitimate, and only publishes reviews that meet our strict criteria.
Verification doesn’t stop at the point of publication. Our Trust & Safety team routinely audits older reviews against our guidelines. When reviews fall short of our standards, we remove them.
We evaluate service providers using a structured methodology that combines:
- In-depth client interviews and ratings
- Comprehensive project details
- Market presence
- Portfolio examples and industry recognition
This data powers tools like the Leaders Matrix, which helps you compare agencies directly. Our research team curates rankings by weighing verified reviews most heavily, so the most trusted and experienced providers rise to the top.
Using this unique combination of verified client feedback and provider-supplied insights, Clutch distills the most important details into clear, digestible summaries so you have everything you need to make confident, informed decisions quickly.
We take fraud seriously. Providers who violate our guidelines may face lower rankings, restricted visibility, or removal from the platform altogether.
Clutch’s commitment to transparency is ongoing. We’re constantly refining our systems to protect the integrity of reviews and support you in finding the right agency.
List of the Top 15 Swift Development Services
-
$10,000+$25 - $49 / hr50 - 249Limassol, Cyprus
Ability to deliver
39.8/40.019.8/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
40% Custom Software Development40% Swift50% Mobile App Development10% Other -
$75,000+$50 - $99 / hr50 - 249Wrocław, Poland
Ability to deliver
38.4/40.018.6/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Custom Software Development50% Swift80% Mobile App Development10% Other -
$10,000+$25 - $49 / hr250 - 999San Francisco, CA
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
35% Custom Software Development25% Swift5% Web Development40% Mobile App Development20% Other -
$10,000+$50 - $99 / hr50 - 249Greenville, SC
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
30% Custom Software Development35% Swift50% Mobile App Development20% Other -
$10,000+$50 - $99 / hr50 - 249Brno, Czech Republic
Ability to deliver
38.7/40.019.4/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
15% Web Development75% Mobile App Development10% Other -
$25,000+$25 - $49 / hr250 - 999Warszawa, Poland
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
40% Custom Software Development20% Swift10% Web Development20% Mobile App Development30% Other -
$50,000+$150 - $199 / hr250 - 999New York, NY
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
20% Custom Software Development20% Swift20% Web Development20% Mobile App Development40% Other -
$5,000+$25 - $49 / hr250 - 999Jaipur, India
Ability to deliver
39.8/40.020/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Web Development60% Mobile App Development30% Other -
$10,000+$25 - $49 / hr50 - 249Khmel'nyts'kyi, Ukraine
Ability to deliver
36.9/40.017/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
30% Custom Software Development50% Swift40% Mobile App Development30% Other -
$25,000+$50 - $99 / hr50 - 249Hollywood, FL
Ability to deliver
39.5/40.020/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
10% Custom Software Development30% Swift10% Web Development60% Mobile App Development20% Other -
$100,000+$50 - $99 / hr250 - 999San Francisco, CA
Ability to deliver
37.8/40.017.8/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
10% Web Development20% Mobile App Development70% Other -
$10,000+$50 - $99 / hr50 - 249Cluj-Napoca, Romania
Ability to deliver
39.6/40.020/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
45% Web Development45% Mobile App Development10% Other -
$5,000+$25 - $49 / hr50 - 249L'viv, Ukraine
Ability to deliver
38.9/40.019.4/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
35% Web Development35% Mobile App Development30% Other -
$25,000+$50 - $99 / hr50 - 249Karlín, Czech Republic
Ability to deliver
38.2/40.018.6/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
30% Web Development60% Mobile App Development10% Other -
$10,000+$25 - $49 / hr50 - 249Indore, India
Ability to deliver
37.5/40.018/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
10% Custom Software Development40% Swift50% Mobile App Development40% Other -
$10,000+< $25 / hr50 - 249New Delhi, India
Ability to deliver
39.8/40.019.8/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
25% Custom Software Development22% Swift15% Web Development25% Mobile App Development35% Other -
$10,000+$50 - $99 / hr50 - 249Poznań, Poland
Ability to deliver
39/40.020/20 Reviews10/10 Clients & Experience9/10 Market PresenceService focus
35% Custom Software Development28% Swift35% Mobile App Development30% Other -
$25,000+$50 - $99 / hr10 - 49Atlanta, GA
Ability to deliver
39.3/40.020/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
35% Web Development65% Mobile App Development -
$25,000+$100 - $149 / hr50 - 249Los Angeles, CA
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
40% Custom Software Development20% Swift50% Mobile App Development10% Other -
$25,000+$25 - $49 / hr1,000 - 9,999Jersey City, NJ
Ability to deliver
38.6/40.018.8/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Custom Software Development15% Swift10% Web Development40% Mobile App Development40% Other -
$25,000+$25 - $49 / hr1,000 - 9,999Orlando, FL
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
10% Custom Software Development10% Swift10% Mobile App Development10% Enterprise App Modernization70% Other -
$25,000+$100 - $149 / hr10 - 49Montréal, Canada
Ability to deliver
36.9/40.017.4/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
20% Custom Software Development50% Swift20% Web Development40% Mobile App Development20% Other -
$5,000+$25 - $49 / hr50 - 249Cluj-Napoca, Romania
Ability to deliver
39/40.019.4/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
20% Web Development50% Mobile App Development30% Other -
$25,000+$50 - $99 / hr50 - 249Wrocław, Poland
Ability to deliver
36.7/40.017/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
20% Custom Software Development42% Swift45% Mobile App Development10% AR/VR Development25% Other -
$5,000+$25 - $49 / hr50 - 249Los Angeles, CA
Ability to deliver
36.9/40.017.6/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
50% Web Development50% Mobile App Development -
$25,000+$25 - $49 / hr50 - 249Vinnytsia, Ukraine
Ability to deliver
38.2/40.018.6/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
30% Web Development70% Mobile App Development -
$25,000+$25 - $49 / hr50 - 249Agoura Hills, CA
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
10% Custom Software Development15% Swift50% Mobile App Development20% Enterprise App Modernization20% Other -
$50,000+$50 - $99 / hr250 - 999Tallinn, Estonia
Ability to deliver
38.9/40.020/20 Reviews9.1/10 Clients & Experience9.8/10 Market PresenceService focus
70% Custom Software Development15% Swift10% Mobile App Development20% Other -
$25,000+< $25 / hr250 - 999Gurugram, India
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
30% Mobile App Development5% AR/VR Development65% Other -
$10,000+$25 - $49 / hr250 - 999Kolkata, India
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
30% Custom Software Development10% Swift10% Web Development60% Other
Latest Swift Articles
See all articles
UI Specifications: How to Create a UI Spec Document
A UI specifications document defines how every screen in your product looks, behaves, and responds to user input. Here's how to write one that developers...
Swift Development FAQs
Clutch features companies that build native iOS, iPadOS, and macOS applications using Apple's Swift programming language quarterly based on a proprietary methodology. The top Swift development companies for 2026 include:
Swift developers design and build native applications for Apple platforms. Their work spans the full development lifecycle, helping clients throughout every phase:
- Translating product requirements into technical architecture
- Building UI components with SwiftUI or UIKit
- Integrating backend APIs and Apple platform services (Push Notifications, Sign in with Apple, StoreKit for in-app purchases)
- Managing App Store submissions
Most senior Swift developers also handle performance optimization, memory management, and accessibility compliance.
According to verified pricing data gathered by Clutch, the average hourly rates for Swift developers typically range from $50 – $150. A straightforward iOS app with standard features generally costs $25,000 – $75,000.
Furthermore, feature-rich apps with custom animations, real-time data, or Apple Watch companions typically run $75,000 – $200,000+. App Store submission, ongoing maintenance, and compatibility updates for new iOS versions add recurring costs — typically 15%–20% of the original build cost annually.
Swift is Apple's programming language — the foundation on which all modern Apple platform apps are built. Whereas SwiftUI is Apple's newer declarative UI framework that uses Swift to describe interface layouts.
For new projects, SwiftUI is generally preferred — it's faster to build with, supports all Apple platforms with a single codebase, and aligns with Apple's long-term direction. When hiring, ask which framework the firm recommends for your project and why — a thoughtful answer reveals genuine expertise.
Look for a portfolio that includes live App Store apps similar to yours in complexity. Then, check if the development firm has recent Swift and SwiftUI experience, since Apple's frameworks evolve rapidly. Ask how they handle the App Store review process, including how they've resolved past rejections.
In addition, make sure to confirm post-launch support terms — most apps require bug fixes and iOS compatibility updates within months of release. Cut through the clutter by leveraging Clutch’s resources, directories, and filters to find the ideal team for your project.
Be cautious of firms that show only design prototypes rather than shipped App Store products. Watch for teams that propose to build your iOS app in a cross-platform framework when you specifically requested native Swift.
Moreover, other signs to be cautious of are vague estimates without a defined scope, reluctance to share App Store links for past work, and firms where your IP and App Store account credentials won't remain in your name.