Company lists · Data refreshed September 2026

Top 25 Startup software development firms based in San Francisco, United States

Name: Startup software development firms based in San Francisco, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 147 companies tracked

RevenueBase identified 147 startup software development firms headquartered in San Francisco, United States as of September 2026 and tracks 2,295 professional contacts across them, including 635 with verified work emails. Across the United States, New York is the largest hub for this category (318 companies); San Francisco has 147.

This list covers startup software development firms headquartered in San Francisco, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

147Companies

2,295Contacts tracked

635Verified emails

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The 25 largest startup software development firms based in San Francisco, United States

Ranked by team size

Top 25 of 147 startup software development firms based in San Francisco, United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to startup software development firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Fluxon	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	201-500	200 contacts →
	Strong evidence “Fluxon is a San Francisco-based software development team trusted by Google, Anthropic, Stripe, and top startups with the technology work that matters most.” Source: RevenueBase Database · checked Sep 29, 2026
2	Cheesecake Labs	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	131 contacts →
	Partial evidence “Cheesecake Labs is an AI, Data, Blockchain, and Software Engineering company that partners with US companies to build and modernize digital products.” Source: RevenueBase Database · checked Sep 29, 2026
3	MINDK	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	124 contacts →
	Strong evidence “MindK is a software development and IT consulting company that helps businesses build software products, automate business processes, modernize technology and infrastructure.” Source: RevenueBase Database · checked Sep 29, 2026
4	Ensolvers	Strong evidence	San Francisco, United StatesHQ checked Sep 29, 2026	51-200	121 contacts →
	Strong evidence “Ensolvers specializes in software development, architecture, product development, outsourcing, testing, and building dedicated teams for end-to-end software solutions.” Source: RevenueBase Database · checked Sep 29, 2026
5	Mechlin Technologies	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	103 contacts →
	Strong evidence “Mechlin Technologies is a San Francisco, California (USA) based software development and technology consulting company, powered by a trusted offshore engineering team, helping…” Source: RevenueBase Database · checked Sep 29, 2026
6	Solveit	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	95 contacts →
	Indirect evidence “Building more than just apps.” Source: RevenueBase Database · checked Sep 29, 2026
7	Yellow Systems	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	73 contacts →
	Partial evidence “Yellow Systems is a technology-first company creating AI/ML-powered and custom software solutions for diverse business needs.” Source: RevenueBase Database · checked Sep 29, 2026
8	Sudolabs	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	71 contacts →
	Partial evidence “We are a go-to digital product-building studio dedicated to helping US startups and enterprises shape and build their product ideas and set up a long-term growth trajectory.” Source: RevenueBase Database · checked Sep 29, 2026
9	Smart IT	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	68 contacts →
	Strong evidence “Smart IT is a custom software development and web development company headquartered in San Francisco.” Source: RevenueBase Database · checked Sep 29, 2026
10	Somnio Software	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	65 contacts →
	Partial evidence “We’re a Digital Product Agency you can grow with, globally recognized as a Top Flutter development company.” Source: RevenueBase Database · checked Sep 29, 2026
11	Span Digital	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	60 contacts →
	Partial evidence “SPAN is a technical strategy and software engineering firm.” Source: RevenueBase Database · checked Sep 29, 2026
12	Cmolds	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	501-1,000	55 contacts →
	Strong evidence “CMOLDS is a tech development company founded in 2016, focused on building mobile and web applications, UX/UI design systems, and custom software solutions.” Source: RevenueBase Database · checked Sep 29, 2026
13	Monosoft	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	53 contacts →
	Strong evidence “Monosoft is a software and product development partner, with US-based headquarters and engineering operations across Europe.” Source: RevenueBase Database · checked Sep 29, 2026
14	Coding Crafts	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	51 contacts →
	Strong evidence “CodingCrafts is a founder led software engineering company helping agencies, startups, and SaaS businesses scale their product development with reliable, high quality engineering…” Source: RevenueBase Database · checked Sep 29, 2026
15	Gbsfo Custom Software Solutions Provider	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	50 contacts →
	Strong evidence “GBSFO is a creative software development solutions company with a strong attitude.” Source: RevenueBase Database · checked Sep 29, 2026
16	Scalac	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	49 contacts →
	Strong evidence “For over 10 years, Scalac has been delivering high-quality software, successfully aiding FinTechs, HealthTechs, EdTechs, AdTechs and startups in their efforts to scale.” Source: RevenueBase Database · checked Sep 29, 2026
17	SF Appworks	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	48 contacts →
	Partial evidence “San Francisco AppWorks is a leader in design-driven digital product development.” Source: RevenueBase Database · checked Sep 29, 2026
18	Iyrix Technologies	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	39 contacts →
	Strong evidence “Iyrix Tech is a custom software development company having 10+ years of experience with a team of high quality engineers and well-versed specialists providing innovative solutions…” Source: RevenueBase Database · checked Sep 29, 2026
19	Goteso	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	33 contacts →
	Strong evidence “Goteso is a product and service based software development firm.” Source: RevenueBase Database · checked Sep 29, 2026
20	Mayven Studios	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	30 contacts →
	Partial evidence “Mayven Studios is a software design and engineering partner that helps you build and scale successful digital products and experiences.” Source: RevenueBase Database · checked Sep 29, 2026
21	Gogrow	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	30 contacts →
	Partial evidence “We help startups navigate the complexities of the digital world and bring ideas to life.” Source: RevenueBase Database · checked Sep 29, 2026
22	Grio AI Experts In WEB & Mobile APP Development For Startups To Enterprises	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	30 contacts →
	Indirect evidence “At Grio, we are passionate about transforming ideas into powerful digital solutions.” Source: RevenueBase Database · checked Sep 29, 2026
23	Hypotenuse Labs	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	29 contacts →
	Strong evidence “Hypotenuse Labs is a product-minded software consultancy trusted by leading startups and enterprise teams to deliver high-quality engineering at startup speed.” Source: RevenueBase Database · checked Sep 29, 2026
24	Roundtechsquare	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	29 contacts →
	Indirect evidence “At RoundTechSquare, we believe that every business deserves digital solutions that inspire growth and innovation.” Source: RevenueBase Database · checked Sep 29, 2026
25	Smarthead	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	11-50	24 contacts →
	Indirect evidence “We’re a truly product-oriented team, not just code monkeys.” Source: RevenueBase Database · checked Sep 29, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: startup software development firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names startup software development firms.
Partial evidence: Its own public description names part of startup software development firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name startup software development firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 147 startup software development firms based in San Francisco, United States

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Startup software development firms based in San Francisco, United States at a glance

As of Sep 29, 2026

27.7%Verified-email coverage

15.6Average contacts per company

11-50Median size (employees)

Sep 29, 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 San Francisco, so it is reported there. Company counts and contact totals on this page are exact for San Francisco, over 147 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among startup software development firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in San Francisco, United States whose own description of what they do matches “startup software development firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names startup software development firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among startup software development firms, and records with no verified work email. Companies headquartered outside San Francisco are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 635 across the full list. 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 29, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Startup software development firms by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names startup software development firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many startup software development firms are there based in San Francisco, United States?

RevenueBase identified 147 startup software development firms headquartered in San Francisco, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Fluxon, headquartered in San Francisco, tops this list with the largest team on record.

Which city in the United States has the most startup software development firms?

New York leads the United States with 318 headquartered companies, followed by Austin (182) and San Francisco (147).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 635 verified decision-maker contacts tracked across these 147 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 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 Smart Search, 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.