Top 10+ Cross Platform App Development Companies in Seattle, WA | Cross Platform App Developers Seattle 2026

Last Updated 17th July 2026 | Category: Top App Development Firms

The List of Top 10+ Cross Platform App Development Companies In Seattle, Washington | Top Cross Platform App Developers Seattle, WA 2026

1. Hyperlink InfoSystem

Not Claimed
Founded 2011
Employees 1000+
Hourly Rate < $25
Our Rating 5.0/5 (65 reviews)
Avg. Project Cost USD 50,000+
Contact No +13097914105
Email info@hyperlinkinfosystem.com
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mobile app development
web development
vr app development
ar app development
wearable app development
iot app development
ui-ux design

2. Woopa

Not Claimed
Founded 2013
Employees 2 - 9
Hourly Rate $25 - $49
Our Rating 4.5/5 (8 reviews)
Avg. Project Cost USD 100,000+
Contact No +5492914405532
Email info@woopasoft.com
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mobile app development
web development
ui-ux design
custom software development
web design

3. NEXTFLY Web Design

Not Claimed
Founded 2000
Employees 10 - 49
Hourly Rate $100 - $149
Our Rating 4.1/5 (8 reviews)
Avg. Project Cost USD 5,000,000+
Contact No +14806309992
Email phoenix@nextfly.com
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mobile app development
web development
web design
e-commerce development
logo designing

4. ChaiOne

Not Claimed
Founded 2008
Employees 50 - 249
Hourly Rate $100 - $149
Our Rating 4.7/5 (6 reviews)
Avg. Project Cost USD 5,000,000+
Contact No +18883160357
Email hello@chaione.com
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mobile app development
web development
vr app development
ar app development
ui-ux design
custom software development

5. JLOOP

Not Claimed
Founded 2001
Employees 10 - 49
Hourly Rate $150 - $199
Our Rating 4.4/5 (7 reviews)
Avg. Project Cost USD 2,500,000+
Contact No +15624915667
Email sayhello@jloop.com
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mobile app development
web development
ui-ux design
web design
branding

6. Zensar Technologies

Not Claimed
Founded 2001
Employees 1000+
Hourly Rate N/A
Our Rating 4.5/5 (8 reviews)
Avg. Project Cost USD 100,000+
Contact No +18664254242
Email marcom@zensar.com
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mobile app development
ui-ux design
enterprise app development
blockchain development
supply chain blockchain
cloud computing software

7. SolbegSoft

Not Claimed
Founded 2008
Employees 50 - 249
Hourly Rate $25 - $49
Our Rating 4.6/5 (6 reviews)
Avg. Project Cost USD 50,000+
Contact No +13472208411
Email business@solbeg.com
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mobile app development
web development
custom software development
enterprise app development

8. Treeline Interactive

Not Claimed
Founded 2004
Employees 10 - 49
Hourly Rate $150 - $199
Our Rating 4.2/5 (8 reviews)
Avg. Project Cost USD 5,000,000+
Contact No +18007644876
Email sales@treelineinteractive.com
View Profile Visit Website
mobile app development
web development
ui-ux design

9. ONLINICO

Not Claimed
Founded 2015
Employees 10 - 49
Hourly Rate $50 - $99
Our Rating 4.5/5 (6 reviews)
Avg. Project Cost USD 10,000+
Contact No +14044653506
Email hello@onlini.co
View Profile Visit Website
mobile app development
wearable app development
ui-ux design
custom software development
internet of things

10. Dogtown Media

Not Claimed
Founded 2011
Employees 10 - 49
Hourly Rate $100 - $149
Our Rating 4.7/5 (6 reviews)
Avg. Project Cost USD 2,500,000+
Contact No +18888660067
Email contact@dogtownmedia.com
View Profile Visit Website
mobile app development
iot app development
ui-ux design

FAQs

What engagement models do App Development companies in Seattle offer for Cross Platform work?
Most App Development companies in Seattle offer three primary engagement models for Cross Platform work: fixed-price for fully defined scope, time-and-material for iterative builds with evolving requirements, and dedicated team arrangements for sustained product development. Fixed-price works best when your Cross Platform requirements are fully documented before kickoff; time-and-material suits projects where scope is expected to shift by more than 20% during delivery. For Cross Platform product development planned over six months or longer, a dedicated team model from a App Development firm in Seattle typically delivers the best cost efficiency and institutional knowledge retention.
What makes it safe to outsource Cross Platform development to a App Development company in Seattle?
Outsourcing Cross Platform development to a reputable App Development company in Seattle is safe when the right legal and operational safeguards are in place — a comprehensive NDA, an explicit IP assignment clause, defined data security standards aligned to your industry, and a clear contractual exit clause. Established App Development firms in Seattle are experienced with international contract standards and typically maintain ISO 27001-aligned internal security policies that govern all client Cross Platform project assets. Always verify the firm has independently confirmed references from past international Cross Platform clients and have your legal counsel review key contract terms before project kickoff.
How do I maximize ROI when budgeting for Cross Platform work with a App Development company in Seattle?
Maximizing ROI on a Cross Platform engagement with a App Development company in Seattle starts with tying the project budget to defined business outcomes — conversion rate targets, revenue milestones, user growth goals — rather than a feature checklist. Allocate 15–20% of your total Cross Platform budget for post-launch iteration cycles driven by real user data, since initial implementations rarely represent the highest-value product configuration. App Development partners in Seattle that integrate analytics from the very start of the Cross Platform build — rather than bolting reporting on after launch — consistently help clients achieve greater measurable return on their technology investment.
How can I report incorrect information about a App Development company's Cross Platform listing in Seattle?
If you encounter inaccurate, outdated, or misleading content on a App Development company's Cross Platform listing for Seattle, use the platform's dispute or report mechanism to flag the specific claim and provide any supporting evidence you have. The directory team investigates substantiated reports and updates or removes listing content that fails to meet the verified accuracy standard for Cross Platform credentials. Submitting correction reports benefits the entire buyer community — users who invest in flagging errors help ensure that other buyers can rely on the Cross Platform company listings for Seattle when making high-stakes vendor decisions.
What should I ask a App Development company in Seattle about their Cross Platform delivery process before signing?
Before signing with a App Development company in Seattle for Cross Platform work, ask how they manage scope changes mid-project, who holds ownership of the Cross Platform source code upon project completion, and what their post-launch SLA and defect resolution process looks like in practice — not just in the brochure. Clarify whether project management and QA are dedicated functions or absorbed by the development team, and ask specifically how they handle the departure of a key Cross Platform team member during active delivery. Getting written answers to these questions before contract signature prevents the most common and expensive disputes that arise in Cross Platform project engagements.
How do I identify a App Development company in Seattle that is genuinely focused on Cross Platform business outcomes?
A App Development company in Seattle genuinely focused on Cross Platform business outcomes will spend the majority of the first discovery call asking about your target users, revenue model, competitive landscape, and growth constraints — before proposing any technical solution or quoting a timeline. They back their Cross Platform track record with specific, quantifiable client results: conversion rate improvements, user growth numbers, or cost reductions — not vague delivery success claims that cannot be verified. If a App Development firm in Seattle moves immediately to tech stack preferences and development timelines without fully understanding your Cross Platform business context, their internal incentives are oriented toward efficient delivery rather than your growth.
How do I choose the right App Development company in Seattle for my specific Cross Platform industry requirements?
Choosing the right App Development company in Seattle for Cross Platform work in your industry starts with filtering for candidates who have already delivered completed Cross Platform solutions in your sector — domain knowledge is not easily transferred across industries for compliance-sensitive or user-critical Cross Platform builds. A firm that has shipped Cross Platform products for clients in your vertical understands the regulatory constraints, data handling requirements, and end-user expectations that a generalist agency would need to discover expensively during your project. Request at least two references from Cross Platform projects in your industry from each shortlisted App Development firm in Seattle and speak directly with those clients before making any final selection decision.

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