1
Clay Global
Mobile and enterprise UX with brand attached.
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In short
Clay began as a UX practice for mobile and enterprise software before growing into a full brand and web studio, so mobile work sits on original foundations rather than an added service. It is the rare studio doing product and brand credibly together, which removes a handoff most projects pay for.
Mobile strengths
App and UI/UX design, product strategy, research, design systems, brand identity, motion.
Work to know
Product and interface work for Google, Amazon, Slack, Coinbase, Snapchat, Sony, and Stripe.
Best for
Teams that want research-led mobile UX and a brand system scoped together.
Details
Global, remote-first · NY, SF, Austin, Denver, Lisbon, BelgradeIndependent
3
ustwo
Two decades of high-craft apps, and Monument Valley.
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In short
Operating since 2004, ustwo pairs human-centred design with real engineering depth and is as comfortable with medical and enterprise apps as with consumer ones. It builds its own products too, which is uncommon for a studio and shows in the craft.
Mobile strengths
Mobile product design, UX research, UI, engineering, product strategy.
Work to know
Monument Valley, built in house, plus app work for Google, Peloton, Samsung, HSBC, and Google DeepMind.
Best for
Ambitious apps that need design and technical rigour in equal measure.
Details
Founded 2004London HQ · Brooklyn, Malmö, Lisbon, TokyoEmployee-owned, B Corp
4
Fantasy
Bold, AI-forward mobile product design.
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In short
An independent firm with more than 25 years building large-scale digital products, from mobile operating systems and automotive interfaces to AI experiences. The work leans bold and emotion-driven, and it stays senior-led without holding-company overhead.
Mobile strengths
Product design, UX, AI experiences, interaction design, brand.
Work to know
Product work for Google, Netflix, X, Spotify, Samsung, and 23andMe.
Best for
Teams building AI-heavy or high-visibility apps that need real visual impact.
Details
San Francisco & New YorkIndependent
5
Work & Co
Mobile products shipped to millions.
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In short
Work & Co prototypes in code and ships production apps rather than handing over comps, with senior people staying hands-on through delivery. Its work sits at the scale where performance and reliability are engineering problems as much as design ones.
Mobile strengths
Product design, UX, mobile and web development, prototyping, strategy.
Work to know
The MTA's live subway map, plus digital products for Apple, Google, Nike, IKEA, and Mailchimp.
Best for
Organisations that need a production-grade app, not a design concept.
Details
Founded 2013Dumbo, Brooklyn · global officesOwned by Accenture since 2024
6
STRV
Design-led mobile with serious engineering.
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In short
A digital product company that designs and builds mobile and web products for iconic brands and well-funded startups, keeping design and engineering under one roof. It leans premium and is known for clean, scalable code alongside the design.
Mobile strengths
Mobile and UI/UX design, iOS and Android development, AI development, product strategy.
Work to know
Product work for Porsche, Tinder, Barnes & Noble, The Athletic, and Barry's.
Best for
Teams that want mobile design and real engineering from one partner.
Details
Los Angeles, New York & PragueIndependent
7
Mission Control
Lean, senior mobile design for tech teams.
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In short
A small, fully remote senior team designing apps and digital products for startups and growth-stage companies. It works fast and caps how many clients it takes on at once, so engagements get senior attention rather than a junior team after the pitch.
Mobile strengths
Product and app design, mobile UI/UX, design strategy.
Work to know
No public named-client list, so this is one to assess directly through the portfolio.
Best for
Lean tech teams that want senior mobile-design attention without agency overhead.
Details
Fully remote, asynchronous-firstIndependent
In short
A New York studio doing product design, development, and branding across mobile, web, SaaS, and ecommerce, working mostly with startups. It has incubated its own products across fifteen-plus years, which shows in how tightly it scopes a first version.
Mobile strengths
Product design, app development, mobile UI/UX, product strategy, branding.
Work to know
The team behind HQ Trivia and Vine, with client work for Whistle, Rockefeller Center, Gemini, and Netflix.
Best for
Founders who want a hands-on partner to take an app from idea to launch.
Details
New York · 51 E 12th StIndependent