15 Best Mobile App Development Companies for Startups in Europe (2026)

Gilzor develops mobile products for startups, SMBs, and product companies from offices in Warsaw and Limassol. Its startup offering goes beyond implementation, covering discovery, business analysis, UX/UI design, development, QA, launch, and post-release support. Mobile engineering includes native iOS and Android development as well as React Native.

For founders still validating an idea, Gilzor can help define requirements and plan a first release before development begins. Its published work includes an e-commerce grocery application for a startup and mobile products that required architecture improvements, bug fixing, and further development after an initial launch.

Tapptitude is a product studio headquartered in Cluj-Napoca, Romania, with another European office in London. It works with funded startups and established brands on mobile-first products, covering product definition, UX/UI, native and cross-platform development, backend engineering, QA, and continued product improvement.

Its startup relevance is particularly clear in its focus on product discovery, prototypes, MVPs, early user testing, and iterative development. This can be useful for founders who need to validate a product rather than hand a fixed specification to a coding vendor.

OSKI Solutions provides end-to-end mobile application development from Tallinn, covering UX/UI, frontend work, APIs, backend engineering, testing, store submission, and continued product development. Its mobile stack includes React Native, Flutter, Swift, Kotlin, and .NET MAUI.

The company's development process starts with defining users, core product requirements, platforms, and the smallest app that can demonstrate value. Interactive prototypes come before production development, followed by short development increments and staged releases.

STRV is a Prague-based digital product company working across mobile and web development. It serves both established brands and startups, with capabilities spanning product management, design, iOS, Android, backend development, QA, and related web engineering.

Its portfolio includes mobile applications supported by design and backend work rather than mobile interfaces developed in isolation. This structure can suit startups that want one product team responsible for design, engineering, and later scaling.

A-Listware combines mobile app development with dedicated engineering teams and staff augmentation. Its mobile practice covers native iOS and Android applications, React Native, Flutter, Xamarin, and progressive web applications, with UX/UI, QA, backend development, and continued support available around the core build.

The engagement model can be useful for startups that already have a CTO or internal product lead but need additional mobile engineers without building a larger in-house team immediately.

Droids On Roids is a Poland-based product development company with a strong mobile focus. Its work covers product strategy, market research, UX/UI, Android and iOS development, cross-platform development, testing, scaling, and maintenance.

The company works from Wroclaw and includes product discovery as part of the development process. That approach can suit startups that need to test assumptions, shape the interface, and establish technical direction before committing to a larger build.

Itexus works with startups on idea evaluation, proof of concept development, technology consulting, MVPs, UX/UI, and custom product engineering. Its mobile practice covers full-cycle application development, with particular experience in fintech products such as banking applications, digital wallets, investment platforms, and lending software.

For early-stage businesses, its startup services include discovery work intended to establish scope, architecture, risks, budget, and delivery milestones before development.

SolveIt develops mobile and web applications for startups, SMEs, and larger businesses. Its startup-oriented services cover discovery, product strategy, UX/UI, MVP development, native mobile engineering, cross-platform development, launch, and maintenance.

The company also provides mobile app consulting for startups that need to validate an application idea before investing in full development. Discovery can include product vision, architecture, prototyping, specifications, and a development plan.

Mobian Studio develops mobile and web applications and is registered in Tallinn, Estonia, with engineering resources in Ukraine. Its mobile stack includes Flutter alongside native Swift and Kotlin development.

The studio works across healthcare, fintech, logistics, telecommunications, retail, and other sectors. It can provide either full product delivery or engineers who join an existing development team. Backend development, QA, cloud infrastructure, and system integrations are also available around the mobile application.

Wolfpack Digital is headquartered in Cluj-Napoca, Romania, with an additional business development office in Dublin. The company works on web and mobile product development for startups and enterprises, including funded startups moving toward product-market fit.

Its cross-functional delivery structure combines product, design, engineering, and QA. Published sector experience includes fintech, healthtech, and e-learning.

Netguru is a Polish digital product company offering mobile development together with product design, backend engineering, AI, cloud work, and software modernization. Its mobile capabilities include native iOS and Android development as well as React Native, Flutter, and Kotlin Multiplatform.

The company supports the product cycle from concept evaluation and UX/UI through development, testing, analytics, maintenance, and continued optimization.

Miquido is a Krakow-based digital product company working on native and cross-platform mobile applications. Its mobile capabilities include Swift and Kotlin as well as Flutter, React Native, and Kotlin Multiplatform, with product design, backend development, modernization, testing, and release management available within the wider engagement.

Its published industry experience includes fintech, healthcare, entertainment, travel, e-commerce, and energy.

Net Devs is a Warsaw-based software engineering company working across backend, frontend, cloud, AI, and application development. Its broader engineering model can support mobile products that depend heavily on APIs, cloud systems, integrations, or custom server-side functionality.

The delivery process extends from discovery and prototyping through development, QA, deployment, and ongoing iteration. It can be particularly relevant for startups where the mobile application is one component of a larger software platform.

SoftPro is headquartered in Warsaw and provides custom software, web applications, cloud development, and related application engineering. Its published material also covers cross-platform application delivery, Swift-related projects, and MVP development for early-stage startups.

The company is broader than a dedicated mobile product studio, so its fit is strongest when a startup needs mobile work tied to web applications, SaaS platforms, APIs, cloud infrastructure, or enterprise integrations.

itCraft is a Polish software development company building custom mobile and web applications for business clients. Its development practice covers native and cross-platform mobile applications, backend systems, quality assurance, and product analysis before implementation.

The company can support projects from an initial concept through development and later product growth. Its web and backend capabilities are useful for startups whose mobile application also requires administrative panels, APIs, databases, or other supporting systems.