Mobile App UI Design Company
Mobile app UI design company, iOS and Android interfaces designed for thumbs, tested on real devices, delivered as developer-ready Figma systems.
HandsOnTech designs mobile app interfaces for iOS and Android (thumb-reachable layouts, platform-native patterns and motion) prototyped and tested on real devices, then delivered as developer-ready Figma files with tokens and specs.
Mobile design fails in the gap between a beautiful dribbble shot and a thumb on a crowded train. We design for the pocket context (reachability, interruption, one-handed use) and test on devices, not desktop previews.
Designed for thumbs, tested on devices
A mobile interface that looks stunning in a portfolio can be unusable on a crowded train: touch targets out of thumb reach, gestures that fight the platform, text that dies in sunlight. We design for the pocket context, one-handed reach zones, interruption recovery, platform-correct navigation on iOS and Android, and we test prototypes on physical devices, not desktop previews. The deliverable is a developer-ready Figma system with tokens, interaction specs and every state defined: loading, empty, error and offline, because real apps live in all four.
One brand, two platforms, zero uncanny valley
Users feel it immediately when an Android app pretends to be an iPhone app or vice versa, the wrong back behavior, the wrong sheet, the wrong ripple. Our approach keeps one visual identity while respecting each platform’s conventions: navigation patterns, system components and motion that feel native to iOS Human Interface Guidelines and Material Design respectively. Store reviewers reward it, users trust it, and your engineers get platform-specific specs instead of a single mockup with “make it work on Android” scribbled in the margin.
Why most redesigns fail
Opinion-driven UI costs twice, once for the wrong design, again to fix what users refuse to adopt.
Stakeholder opinions win
Boardroom taste replaces user evidence. Launch day looks polished; week two shows drop-off nobody predicted.
Handoff breaks the intent
Figma files arrive without edge cases, states or accessibility notes. Engineering improvises, and your brand pays for it.
No baseline metric
Without a number to move (signups, completion, time-to-task) you cannot tell if the redesign worked.
What we design and deliver
Research-backed UX that engineers can build without guesswork.
User research & journeys
Interviews, session review and journey maps tied to the one metric this release must move.
Wireframes & prototypes
Clickable Figma flows tested with real users before a line of production code.
Design systems
Tokens, components and documentation so every screen stays consistent after launch.
Usability & WCAG 2.2 AA
Accessibility and task testing baked in, not a checklist bolted on at the end.
How we design products that ship
Four phases, two-week sprints, evidence at every gate.
Discover
Audit flows, talk to users and agree the success metric before pixels.
Define
Wireframes and prototypes validated with five or more target users.
Design
High-fidelity UI, design system and dev-ready specs with all states.
Validate
Usability tests, accessibility checks and iteration before handoff.
Three ways to engage
Every model starts with a free consultation and a written quote, the price you sign is the price you pay.
Fixed-Price Project
A scoped build with a written price and a launch date, agreed before design begins.
- Written scope and fixed quote within 48 hours
- Two-week sprints with staging demos every other Friday
- Milestone payments tied to shipped work
- 30-day bug warranty in the contract
- Code, designs and content transfer on final payment
Growth Retainer
Monthly compounding work on organic and paid visibility, reported against pipeline.
- Monthly sprint plan agreed in advance
- Live dashboard, the same numbers we see
- AI visibility report: which prompts name you
- No long lock-in, cancel with 30 days notice
- Same team as your build, no handoff loss
Dedicated Team
Senior specialists embedded in your Slack, repo and standups, capacity without recruiting.
- Start within 1–2 weeks of the intro call
- Your tools, your process, your time zone
- Scale seats up or down with two weeks notice
- NDA and full IP assignment from day one
- Direct access, no account-manager relay
What we build, and what it costs
Published ranges and timelines, the same figures that appear in your written scope. Client work is covered by NDA; references are shared during scoping for qualified projects.
Websites and e-commerce
Marketing sites, storefronts and headless builds on WordPress, Shopify, Next.js or Astro, with green Core Web Vitals and SEO architecture as launch requirements.
$15k–$75k published range · 4–10 wk typical build
Website development servicesMobile apps
Native iOS and Android or React Native and Flutter, carried through App Store and Google Play review, with crash monitoring and post-launch releases included.
$45k–$180k published range · 10–20 wk typical build
Mobile app development servicesAI products and automation
One workflow piloted before anything scales, then production agents, chatbots and dashboards with retrieval, evaluation sets, guardrails and cost monitoring.
$25k–$200k published range · 6–20 wk typical build
AI development servicesThe stack we ship with
Chosen per project for your team and roadmap, never by our habits.
Design
Frontend
Backend
Platforms
Mobile
AI
What you can hold us to
Not adjectives, terms. Each of these is written into the engagement before you sign.
Fixed price, in writing, before work starts
You receive a written scope with milestones, deliverables and a delivery date within 48 hours of the free audit. No hourly creep, and no change order three weeks before launch.
You own everything on final payment
Source code, Figma files, content and analytics access transfer to you when the final invoice clears. No license fees, no vendor lock-in, and no platform you can only edit by paying us.
A 30-day bug warranty, in the contract
Bugs found in the first month after go-live are fixed free. It is a contractual term rather than a sales promise, and it is the reason we would rather ship correctly than ship early.
Who hires us for UI/UX
SaaS founders rebuilding onboarding
Marketing teams with low landing-page conversion
Product leads inheriting legacy UX debt
Enterprises needing WCAG 2.2 AA conformance
30-day warranty
Bugs found in the first month get fixed free, in the contract.
You own everything
Code, designs and content transfer on final payment.
U.S. hours overlap
Standups and demos on ET, CT, MT or PT, your pick.
Fixed price, fixed date
Quoted in writing before work starts. No surprise change orders.
Explore other capabilities
Common questions
Do you design differently for iOS and Android?
Where it matters, yes. Navigation, system gestures and component conventions differ, and users feel it when an app ignores their platform. We keep one brand language with platform-correct behavior, which is also what App Store and Play reviewers expect.
What do developers receive at handoff?
Figma files with a component library, design tokens for color/type/spacing, interaction specs including motion, and annotated edge cases, empty, loading, error and offline states. Handoff meetings walk your engineers through it; questions during build are answered in your Slack, not ticketed.
What is Mobile App UI Design Company?
Mobile App UI Design Company is a scoped, fixed-price engagement from HandsOnTech, a U.S. design, development and growth studio headquartered in Sacramento, California. We map URL architecture, internal links and schema before build, tie UI/UX design work to one business metric you name, and deliver in two-week sprints with staging demos on U.S. business hours.
How much does mobile app UI design company cost?
A UX audit runs $4k–$8k, a site or product redesign $12k–$35k, and a full design system $25k–$60k. Every engagement is fixed-price after a free review, and the deliverables (flows, prototypes, tested screens, documented components) are listed in the scope before you sign.
How long does mobile app UI design company take?
UX audits deliver in 1–2 weeks, redesigns in 3–6 weeks, and design systems in 6–10 weeks. Research and low-fidelity flows come before visual polish, so the expensive decisions get tested while they are still cheap to change.
Do you work with businesses across the United States?
Yes. We are headquartered at 2108 N ST STE N, Sacramento, CA 95816 and serve clients in all 50 states, remote-first, with daily overlap on Eastern, Central, Mountain and Pacific time. Contracts and IP assignment run through a U.S. entity, and on-site working sessions in major metros are available by arrangement.
What platform or stack do you build on?
Figma for design, prototyping and handoff, with documented tokens, states and specs your engineers can build from without guessing. Usability testing runs with real users, and accessibility is designed to WCAG 2.2 AA rather than audited after launch.
How is this different from an agency or an offshore team?
One team covers design, development and growth, so there is no handoff tax and nobody to blame. You talk to the designer and engineer doing the work instead of an account manager relaying messages. And it is contractual, not a pitch: fixed price, U.S. hours, a 30-day bug warranty and full ownership transfer on final payment.
Get a timeline, a price range and a next step.
Send your URL and the metric this project has to move. A free 48-hour audit comes back with a prioritized fix list, and qualified projects get a written fixed-price scope within two business days.
Tell us what you're building.
You'll get a timeline, a price range and the next step, usually within two business days. A technical lead reads every message, not a sales development rep. No deck, no discovery-call maze.
- ✉️sales@handsontech.ioWe reply within one business day
- 📞(866) 965-8749Mon–Fri, 9am–6pm ET
- 📍2108 N ST STE NSacramento, CA 95816 — serving all 50 states
- ⚡Free 48-hour auditRecorded walkthrough plus a prioritized fix list
- 🔒NDA on requestSigned before you share anything sensitive