Company lists · Data refreshed September 2026

Top 25 B2B SaaS development agencies based in Seattle, United States

Name: B2B SaaS development agencies based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 107 companies tracked

RevenueBase identified 107 company matches for B2B SaaS development agencies associated with Seattle, United States as of September 2026 and tracks 1,629 professional contacts across them, including 247 with verified work emails. Across the United States, New York is the largest hub for this category (603 companies); Seattle has 107.

This list covers company matches for B2B SaaS development agencies 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 23, 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 23, 2026 How this list was built

107Companies

1,629Contacts tracked

247Verified emails

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The 25 largest B2B SaaS development agencies based in Seattle, United States

Ranked by team size

Top 25 of 107 company matches for B2B SaaS development agencies based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 23, 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 23, 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 23, 2026 · View company records in RevenueBase
2	Ukad Umbraco, Optimizely And Azure Solution Partner	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
3	Kalungi	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	51-200	73 contacts →
	Exact match “A complete and instant marketing team for early-stage B2B SaaS companies.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
4	2nd Watch	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	201-500	67 contacts →
	Exact match “2nd Watch is now Ollion.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
5	Spiderbox Design Vietnam	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
6	Pubgenius INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
7	NEW Normal	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
8	Fusion Technologies	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	23 contacts →
	Exact match “Fusion Technologies is a growing IT consulting, managed service provider.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
9	Codenato	Exact match	Seattle, United StatesHQ recorded Sep 23, 2026	11-50	21 contacts →
	Exact match “Founded in 2016, we have vast experience on finding the best solutions for our customers.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
10	EXP Technical, INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	19 contacts →
	Exact match “Founded in 2003, EXP makes people’s lives easier and more productive, through collaborative relationships with our clients and community We can provide a complete outsourced IT…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
11	Itrellis, LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
12	Lunarbyte	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
13	Knack Collective	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	11 contacts →
	Exact match “Knack Collective is a strategic B2B marketing agency helping technology companies turn complexity into scalable growth.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
14	Fostec	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	1-10	8 contacts →
	Exact match “Founded in 1998, Fostec is a client-focused Information Technology consulting firm that designs solutions and provides technical expertise to small and mid-sized businesses…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
15	Swyft ERP Swyfterp.com	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	7 contacts →
	Exact match “We build custom business software solutions that scale with companies and help streamline business processes and also specialize in NetSuite build/implementation for larger…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
16	Gols INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	7 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
17	Overthink Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	1-10	6 contacts →
	Exact match “Overthink Group is a content strategy agency for B2B SaaS.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
18	Blackwing Creative	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	6 contacts →
	Exact match “BlackWing Creative is a B2B marketing agency located in Seattle and San Francisco.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
19	Gigantic	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	1-10	5 contacts →
	Exact match “Gigantic builds high converting marketing websites for growing B2B companies.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
20	Lightboard, INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	11-50	5 contacts →
	Exact match “Lightboard is a modern design agency, built from the ground up around software.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
21	Pacific Automation Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
22	Cogenix	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	1-10	4 contacts →
	Exact match “Cogenix offers business consulting, application development and software integration services to our client base.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
23	Zaifworks LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
24	ASMBL	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	51-200	3 contacts →
	Exact match “At Assemble, our people are the source of our success.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
25	Growth Response	Exact match	Seattle, WA, United StatesHQ recorded Sep 23, 2026	1-10	3 contacts →
	Exact match “Growth Response is done-for-you outbound prospecting service for B2B SaaS and digital agencies.” Recorded in the RevenueBase company graph · Sep 23, 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 “B2B SaaS development agencies”. 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 107 B2B SaaS development agencies based in Seattle, United States

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B2B SaaS development agencies based in Seattle, United States at a glance

As of Sep 23, 2026

15.2%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 107 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 “B2B SaaS development agencies” 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 247 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 23, 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.

B2B SaaS development agencies 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 “B2B SaaS development agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many B2B SaaS development agencies are there based in Seattle, United States?

RevenueBase identified 107 company matches for B2B SaaS development agencies 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 B2B SaaS development agencies?

New York leads the United States with 603 company records, followed by Austin (352) and Houston (253). Seattle has 107.

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 247 professional contacts with verified work emails tracked across these 107 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 23, 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.