Company lists · Data refreshed September 2026

Top 25 App development outsourcing companies based in Seattle, United States

Name: App development outsourcing companies based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 139 companies tracked

RevenueBase identified 139 company matches for app development outsourcing companies associated with Seattle, United States as of September 2026 and tracks 1,115 professional contacts across them, including 271 with verified work emails. Across the United States, New York is the largest hub for this category (906 companies); Seattle has 139.

This list covers company matches for app development outsourcing companies associated with Seattle, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

139Companies

1,115Contacts tracked

271Verified emails

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The 25 largest app development outsourcing companies based in Seattle, United States

Ranked by team size

Top 25 of 139 company matches for app development outsourcing companies based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	White Rabbit Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	135 contacts →
	Exact match “White Rabbit Group is a software development agency with a highly diverse and creative team that takes an idea through development and into scale.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Ukad Umbraco, Optimizely And Azure Solution Partner	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	201-500	123 contacts →
	Exact match “UKAD is a helping companies extend engineering capacity and deliver complex solutions with predictable outcomes.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Ntsprint	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	92 contacts →
	Exact match “NTSprint is an IT company founded in the State of Washington, United States, in 2016.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Spiderbox Design Vietnam	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	38 contacts →
	Exact match “Spiderbox Design - Transforming businesses worldwide with innovative digital solutions since 2011.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Fast Track Team	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	28 contacts →
	Exact match “Fast Track creates cutting edge websites and web applications for businesses of all sizes faster and better than anyone else in the business.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Exit83 Consulting	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	25 contacts →
	Exact match “Since 2007, EXIT83 Consulting has been assisting companies with Website Development, Software Architecture, Mobile Application Development, Business Analysis and Fundraising…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Pubgenius INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	25 contacts →
	Exact match “At pubGENIUS we build software that helps great ideas become real products.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	NEW Normal	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	25 contacts →
	Exact match “NewNormal builds custom software and lasting partnerships Since 2012 we’ve helped clients turn ideas into products that scale.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Indeema Software INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	51-200	23 contacts →
	Exact match “Assisting with every stage of development, especially in the IoT area.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	SITG	Exact match	Seattle, United StatesHQ recorded Sep 28, 2026	11-50	19 contacts →
	Exact match “SITG has experience and expertise in building complex Cloud & Enterprise applications esp.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Dreamteam Mobile	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	15 contacts →
	Exact match “DreamTeam Mobile is a trusted and reliable source for custom software development.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	GENUI	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	13 contacts →
	Exact match “What sets GenUI apart is an end-to-end product focus throughout all our experience design and software development services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Itrellis, LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	13 contacts →
	Exact match “iTrellis is a Custom Software and Systems Integration consultancy located in Seattle, WA.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Lunarbyte	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	12 contacts →
	Exact match “Lunarbyte is a custom software and product development firm trusted by teams across industries to deliver dependable, scalable software solutions that drive real business results.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Apsis Labs	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	10 contacts →
	Exact match “At Apsis Labs, we help product-driven teams bring high-quality web and mobile applications to life-quickly, cleanly, and with purpose.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	K Consulting	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	8 contacts →
	Exact match “Welcome to K.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Gols INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	7 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Helpful Human	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	11-50	7 contacts →
	Exact match “Helpful Human strategically cooperates with our clients to design and build digital products that bring people together.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Montana Banana WEB Design & Development	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	6 contacts →
	Exact match “Montana Banana is a Seattle-based web development company specializing in e-commerce integrations, user-friendly shopping experiences, web accessibility, and mobile apps.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Alpha Encoded	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	6 contacts →
	Exact match “Based in the tech-centric city of Seattle, Alpha Encoded stands at the forefront of digital innovation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Pacific Automation Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	4 contacts →
	Exact match “We create and deploy tailor-made software solutions aimed at enhancing efficiency and optimizing operations for a diverse range of clients, spanning individuals, businesses…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Zuhly Technologies	Exact match	Seattle, United StatesHQ recorded Sep 28, 2026	11-50	4 contacts →
	Exact match “Software Development and Consulting.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Zaifworks LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	4 contacts →
	Exact match “Zaifworks is software development and cloud consulting firm that specializes in healthcare, real-estate and it services industries.* We transform, deploy and support what you are…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Mahogany And Mango LLC	Exact match	Seattle, United StatesHQ recorded Sep 28, 2026	1-10	3 contacts →
	Exact match “Helping small businesses and non-profit organizations build their online presence with custom-built websites & web applications.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Instrumental Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1-10	3 contacts →
	Exact match “We are your software team for hire: four industry veterans with decades of cross-platform experience who have worked together for over a decade to launch products, run agencies…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “app development outsourcing companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 139 app development outsourcing companies based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 271 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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App development outsourcing companies based in Seattle, United States at a glance

As of Sep 28, 2026

24.3%Verified-email coverage

8.0Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 139 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Seattle, United States whose business descriptions match “app development outsourcing companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 271 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

App development outsourcing companies by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “app development outsourcing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many app development outsourcing companies are there based in Seattle, United States?

RevenueBase identified 139 company matches for app development outsourcing companies associated with Seattle, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

White Rabbit Group tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most app development outsourcing companies?

New York leads the United States with 906 company records, followed by Austin (467) and San Francisco (366). Seattle has 139.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 271 professional contacts with verified work emails tracked across these 139 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.