Company lists · Data refreshed November 2026

Top 23 Web and app development companies based in Seattle, United States

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 166 companies tracked

RevenueBase identified 166 company matches for web and app development companies associated with Seattle, United States as of November 2026 and tracks 1,144 professional contacts across them, including 275 with verified work emails. Across the United States, New York is the largest hub for this category (1,079 companies); Seattle has 166.

This list covers company matches for web and app development 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 November 6, 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 Nov 6, 2026 How this list was built

166Companies

1,144Contacts tracked

275Verified emails

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The 23 largest web and app development companies based in Seattle, United States

Ranked by team size

Top 23 of 166 company matches for web and app development companies based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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 Nov 6, 2026	51-200	127 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 · Nov 6, 2026 · View company records in RevenueBase
2	Palador	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	33 contacts →
	Exact match “Palador has provided successful enterprise solutions and strategic initiatives for mobility, app and web development and data and software integration since 2005.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Pubgenius INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	26 contacts →
	Exact match “At pubGENIUS we build software that helps great ideas become real products.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	NEW Normal	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	26 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 · Nov 6, 2026 · View company records in RevenueBase
5	Efelle Creative, Digital Marketing Agency	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	25 contacts →
	Exact match “efelle is an internationally recognized ecommerce & digital marketing agency based out of Seattle, Washington, delivering highly functional and engaging websites, applications…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Exit83 Consulting	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	51-200	21 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 · Nov 6, 2026 · View company records in RevenueBase
7	GENUI	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 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 · Nov 6, 2026 · View company records in RevenueBase
8	Lunarbyte	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	11 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 · Nov 6, 2026 · View company records in RevenueBase
9	Foundry Interactive	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	11 contacts →
	Exact match “We build, market and optimize websites that connect customers and businesses in ways that are both meaningful and measurable.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Blue Rooster INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	10 contacts →
	Exact match “Blue Rooster is a modern digital agency driving Strategy, UX Design and Technology for today's enterprise.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Internet Development Studio Company	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	10 contacts →
	Exact match “Internet Development Studio Company (INTDEV) is your go-to design and engineering team, delivering high performance building, shipping, maintaining websites, platforms, brands…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Seamonster Studios	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	9 contacts →
	Exact match “Based in Seattle, WA, SeaMonster Studios is a lean and limber group of designers, developers, marketers, team players, technologists, and strategists.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Research & Design	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	9 contacts →
	Exact match “Research & Design is a design and technology firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Apsis Labs	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	9 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 · Nov 6, 2026 · View company records in RevenueBase
15	K Consulting	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	9 contacts →
	Exact match “Welcome to K.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Gols INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Pythonwise INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match “Pythonwise Inc is leading provider of Information Technology consulting and business process services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Montana Banana WEB Design & Development	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	6 contacts →
	Exact match “Montana Banana is a Seattle-based web design and development company that crafts custom websites, ecommerce platforms, and mobile apps that attract customers, run smoothly, and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Engine Interactive	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	6 contacts →
	Exact match “As one of the most established interactive agencies on the West Coast, Engine has been creating high performance interactive media for 17 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Helpful Human	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	5 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 · Nov 6, 2026 · View company records in RevenueBase
21	Dupla Studios	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “Dupla Studios is a user experience and digital product studio based in Seattle, WA.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Alpha Encoded	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	4 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 · Nov 6, 2026 · View company records in RevenueBase
23	Zaifworks LLC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 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 · Nov 6, 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 “web and app development 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 23 of 166 web and app development companies based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 275 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Web and app development companies based in Seattle, United States at a glance

As of Nov 6, 2026

24.0%Verified-email coverage

6.9Average contacts per company

1-10Median size (employees)

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

103

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 166 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 “web and app development 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 275 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 November 6, 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.

Web and app development 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 “web and app development companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 166 company matches for web and app development companies associated with Seattle, United States as of November 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 web and app development companies?

New York leads the United States with 1,079 company records, followed by Austin (463) and Los Angeles (416). Seattle has 166.

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 275 professional contacts with verified work emails tracked across these 166 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 November 6, 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.