Best Software Testing Tools Companies in California, United States
The 279 best Software Testing Tools companies in California, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Sauce Labs.
Ranked: Best Software Testing Tools companies in California
| # | Company | Disclosed funding | Last round | Stage | Employees | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Sauce Labs Cloud based cross browser testing solutions provider | $228M | 28 mo ago | Series G | 243 243 → 342 (+41%) · sector median +38% | — | ContentfulSentryAtlassian Statuspage+42 | 39 patents Automated software testing tools with synthetic data generation and selector extraction. | 1 launch · 1 award |
| 2 | Sentry 🦄 Provider of application performance monitoring and error tracking software solutions | $217M | 49 mo ago | Series E | 232 232 → 453 (+95%) · sector median +38% | Chris Jennings Co-Founder | SentryZendeskApple iCloud Mail+21 | 22 patents Transformer rapid depressurization and explosion mitigation vent systems | 1 launch |
| 3 | Bugcrowd 🦄 Provider of crowdsourced security platform offering vulnerability disclosure and penetration testing | $184M | 19 mo ago | Series E | 131 | Casey Ellis Founder and Chief Strategy Officer | WordPressApple iCloud MailGoogle Workspace+44 | 15 patents AI-driven vulnerability prediction and crowdsourced bug de‑duplication for software security. | 1 job opening |
| 4 | Leanplum Mobile A/B testing, personalization & analytics platform | $172M | 75 mo ago | Acquired | 45 | — | WordPressApple iCloud MailGoogle Workspace+35 | — | — |
| 5 | HackerOne AI powered security testing platform | $159M | 52 mo ago | Series E | 231 | Jobert Abma Co-Founder | DrupalMariaDBPHP+18 | — | 2 awards |
| 6 | Honeycomb Cloud based application performance monitoring platform | $150M | 38 mo ago | Series D | 141 141 → 291 (+106%) · sector median +38% | Edith Harbaugh Co-Founder & CEO | WordPressSentryApple iCloud Mail+47 | — | — |
| 7 | User Testing Provider of platform for gathering and analyzing user experience feedback | $148M | 67 mo ago | Acquired | 557 | Alfonso Nuez Co-Founder | DrupalSentryPHP+28 | — | 1 award |
| 8 | UserZoom Provider of a platform for gathering user feedback on digital experiences | $137M | 62 mo ago | Acquired | 429 | — | Apple iCloud MailGoogle Workspacestyled-components+8 | 2 patents Patents concentrated in computing, sensing & instrumentation | — |
| 9 | Headspin 🦄 Provider of automated and manual testing platform for mobile and web | $117M | 38 mo ago | Series C | 80 | Eric Hatton CEO | WebflowSentryWistia+21 | 33 patents Mobile device testing, remote app signing, and secure data exchange platforms | — |
| 10 | Synack Platform offering security testing solution | $112M | 72 mo ago | Series D | 182 182 → 245 (+35%) · sector median +38% | Mark Kuhr Co-Founder & CTO | WordPressSentryMySQL+24 | 47 patents Automated, distributed application security testing and vulnerability discovery platforms | — |
| 11 | TestMu AI Provider of AI-powered cloud platform for software testing and quality engineering | $109M | 18 mo ago | Series D | — | Asad Khan Co-Founder & CEO | DiscourseRubyRuby on Rails+23 | — | 1 launch |
| 12 | Semgrep Platform offering code analysis and review solutions | $93M | 16 mo ago | Series D | 146 | Isaac Evans Co-Founder & CEO | SalesforceBootstrapAtlassian Statuspage+24 | — | 2 launchs |
| 13 | Horizon Three AI Cloud based pentesting platform 55Funding top 18%Tech top 29%Moat top 39%Product top 41% All 10 signals ▾Fundingtop 18% Techtop 29% Moattop 39% Producttop 41% Partnerstop 45% Markettop 50% Talentbottom 48% Growthbottom 47% Globalbottom 37% Newsbottom 31% Funding: Raised $83.5M across 6 rounds · 6 rounds over 6 yrs (1.0/yr) Tech: 48 technologies across 5/8 capability areas · Cloud: Amazon S3, Amazon Web Services rank vs industry peers · Fliar Intelligence Index 55/100 | $83M | 5 mo ago | Series D | 102 | Anthony Pillitiere Co-Founder Horizon3.ai | WordPressApple iCloud MailMySQL+34 | — | 1 partnership · 1 expansion |
| 14 | LambdaTest Cloud based cross browser testing software | $70M | 45 mo ago | Series C | 406 | Harish Sharma ex-Co-Founder | DiscourseRubyZoho+28 | — | — |
| 15 | AppOnboard Platform for the testing of mobile applications | $69M | 64 mo ago | Series C | 24 24 → 22 (-8%) · sector median +38% | Adam Piechowicz Co-Founder & CTO | — | 3 patents Interactive media authoring, format conversion, and studio development tools | — |
| 16 | Opkey Provider of AI-powered test automation platform for enterprise resource planning | $59M | 21 mo ago | Series B | 51 | Avinash Tiwari Co-Founder | WebflowAmazon Web ServicesSplide+28 | — | — |
| 17 | Evinced Developer of AI-powered tools for website and mobile app accessibility | $57M | 18 mo ago | Series C | 15 | Navin Thadani Co-Founder & CEO | SentryZendeskNode.js+22 | — | — |
| 18 | Cigital Interactive application security testing solution | $55M | 152 mo ago | Acqui-Hired | 4,430 | — | — | 9 patents Application security testing and runtime protection for software vulnerabilities | — |
| 19 | Instabug Provider of agentic mobile observability platform for application performance management | $54M | 49 mo ago | Series B | 191 | Omar Gabr Co-Founder & CEO | ReadMeAlgoliaSalesforce+26 | — | 1 launch |
| 20 | Linear 🦄 Provider of a system to streamline issues, projects, and product roadmaps | $52M | 12 mo ago | Series C | 50 | Jori Lallo Co-Founder | SanitySentryApple iCloud Mail+24 | 216 patents Patents concentrated in electrical & electronics | 1 partnership |
| 21 | Eppo Developer of a platform for experimentation and feature management solutions | $51M | 25 mo ago | Acquired | 20 20 → 20 (+0%) · sector median +38% | Chetan Sharma Founder & CEO | Webflow EcommerceWebflowSalesforce+25 | — | — |
| 22 | WhiteHat Security Application security for modern development | $51M | 113 mo ago | Acquired | 333 | — | — | 63 patents Machine‑learning‑driven application security testing and automated vulnerability remediation | — |
| 23 | Apteligent Cloud based platform offering application performance monitoring solutions | $50M | 146 mo ago | Acqui-Hired | 71 | — | — | 5 patents Mobile application performance monitoring and crash analytics across diverse devices | — |
| 24 | Tonic.ai AI-based solutions for creating safe, useful, de-identified data for QA, testing, and development. | $45M | 56 mo ago | Series B | 105 | Karl Hanson Co-Founder | WebflowApple iCloud MailGoogle Workspace+31 | — | 2 launchs |
| 25 | Rainforest QA QA as a service | $42M | 100 mo ago | Series B | 19 | Russell Smith Board member | WebflowApple iCloud MailGoogle Workspace+33 | 38 patents AI-driven automated software testing platforms with human-in-the-loop and visual inspection | — |
| 26 | Cobalt Provider of penetration testing as a service and offensive security | $37M | 69 mo ago | Series B | 465 | Jacob Hansen Co-Founder | HubSpot CMS HubSentryApple iCloud Mail+21 | 93 patents Microbial fermentation processes and genetic engineering for bioproduct production | — |
| 27 | Rookout Production stage debugging platform | $28M | 45 mo ago | Acquired | 47 | Liran Haimovitch Co-Founder & CTO | — | — | — |
| 28 | Bright Security Platform offering security testing software | $25M | 12 mo ago | Series A | 135 | Bar Hofesh Co-Founder | CTO | WordPressApple iCloud MailMySQL+26 | — | — |
| 29 | Appvance.ai Platform offering AI based automated testing software | $24M | 53 mo ago | Series C | 25 25 → 61 (+144%) · sector median +38% | Frank Cohen CTO and Founder | WordPressMySQLPHP+29 | 12 patents AI-driven automated software testing and model-based test script generation | — |
| 30 | Evolv AI based AB testing platform | $23M | 31 mo ago | Series A | 31 31 → 21 (-32%) · sector median +38% | Michael Scharff Founder | HubSpot CMS HubApple iCloud MailGoogle Workspace+19 | 54 patents Advanced electronic vaporization systems for precise heating of viscous and solid substances. | — |
| 31 | Wallarm API security platform delivering complete protection against attacks and abuse | $20M | 10 mo ago | Series C | 6 | Stepan Ilyin Co-Founder | WordPress Block EditorWordPressMySQL+31 | 10 patents AI-driven API security and L7 threat detection for firewalls and IDS | — |
| 32 | Functionize Cloud based platform offering software for automated testing | $19M | 10 mo ago | Series B | 125 | Tamas Cser Founder & CEO | WebflowSentryZendesk+24 | 34 patents AI-powered automated generation and analysis of software test cases | — |
| 33 | Test AI-powered mobile test automation tool | $19M | 64 mo ago | Series A | 21 | Jason Arbon Co-Founder & CEO | — | 11 patents Cleaning and thermal management solutions for semiconductor wire‑bonding and probe equipment | — |
| 34 | Inspectiv Threat and vulnerability intelligence solutions for enterprises | $16M | 48 mo ago | Series A | 45 | Joseph Melika Founder | HubSpot CMS HubMarkerApple iCloud Mail+22 | — | — |
| 35 | Testsigma Provider of AI-powered platform for continuous software testing and automation | $13M | 24 mo ago | Series A | 124 | Vikram P Co-Founder | Node.jsZohoReact+32 | — | 1 award |
| 36 | Skyramp AI powered performance testing platform | $10M | 11 mo ago | Seed | 9 | Nithin Michael Co-Founder | Framer SitesApple iCloud MailGoogle Workspace+11 | 4 patents Automated testing frameworks for microservice architectures | — |
| 37 | Ranger Cloud based test management software | $9M | 18 mo ago | Seed | — | Josh Ip Founder & CEO | WebflowMicrosoft AdvertisingGoogle Analytics+17 | — | — |
| 38 | Deductive AI AI powered software solutions to automate debugging and root-cause analysis of software issues | $8M | 7 mo ago | Seed | — | Sameer Agarwal Co-Founder & CTO | WebflowGSAPAmazon Web Services+14 | — | — |
| 39 | NightVision Platform offering security testing software | $5M | 14 mo ago | Series A | — | Kinnaird McQuade Founder & CEO | WebflowFreshworks CRMreCAPTCHA+10 | — | — |
| 40 | Promptfoo Open-source tool to test AI applications | $5M | 11 mo ago | Acquired | — | Ian W Co-Founder & CEO | DocusaurusReactKnockout.js+14 | — | — |
| 41 | BaseRock Provider of AI-driven platform for automated functional, integration, and unit testing | $5M | 37 mo ago | Seed | — | Rishi Singh Founder & CEO | Webflow EcommerceWebflowHubSpot+16 | — | — |
| 42 | Sapient AI AI powered test generation platform | $5M | 37 mo ago | Seed | 2 | Rishi Singh Founder & CEO | — | 16 patents Location-based advertising platforms and region-aware electrical intelligence for smart grid analytics. | — |
| 43 | Pythagora AI powered automated testing tool | $4M | 25 mo ago | Seed | 2 | Senko Rasic Co-Founder | WebflowYouTubeAmazon Web Services+18 | — | — |
| 44 | Waypoint AI powered debugging software for developers | $3M | 11 mo ago | Seed | — | Jiri Dubansky Co-Founder | Node.jsHeadless UITailwind CSS+16 | — | 1 partnership |
| 45 | Cekura Provider of automated quality assurance platform for voice and chat agents | $2M | 11 mo ago | Seed | — | Sidhant Kabra Co-Founder | Cart FunctionalityNode.jsRadix UI+13 | — | — |
| 46 | Revyl Provider of an AI-powered platform for mobile application end-to-end testing | $1M | 19 mo ago | Unfunded | — | Landseer Enga Co-Founder & CEO | — | — | 1 launch |
| 47 | Canary Provider of AI-powered platform that automates software testing and quality assurance | $500K | 5 mo ago | Seed | — | Viswesh NG Co-Founder | — | — | — |
| 48 | Momentic AI-powered platform for end-to-end testing of web applications using natural language | $500K | 7 mo ago | Series A | — | Jeff An Co-Founder | WebflowVimeoAmazon Web Services+19 | — | — |
| 49 | GrowthBook Provider of a open-source and cloud-enabled testing tools platform | $125K | 12 mo ago | Series A | 10 | Graham McNicoll Co-Founder | GhostNode.jsMathJax+23 | — | 1 launch |
| 50 | Hamming Provider of artificial intelligence voice agents | $125K | 18 mo ago | Seed | — | Marius Buleandra Co-Founder & CTO | TurbopackNode.jsRadix UI+20 | — | — |
Top 12 Software Testing Tools companies in California
#1
Series D · San Francisco, California · founded 2019 · 102 employees$83.5Mraised▾
Cloud based pentesting platform. The features of the platform include configuration control, discovering and authorization of assets, vulnerability assessment, security posture analysis, and more. It also prioritizes vulnerabilities, performs audits, and identifies compromised data.
- Jan 2026Series D—
- May 2025Series D$100M
- Jul 2023Series C$40M
- Nov 2021Series B$35M
#2
Linear 🦄Series C · San Francisco, California · founded 2019 · 50 employees$52.2Mraised▾
Provider of a system to streamline issues, projects, and product roadmaps. It offers tools for planning, managing, and tracking product initiatives. The system consolidates specifications, milestones, tasks, and documentation in a centralized location. It facilitates collaboration across teams and departments, enabling progress tracking and workflow automation.
- Jun 2025Series C$82M
- Sep 2023Series B$35M
- Dec 2020Series A$13M
- Nov 2019Seed$4.2M
#3
Bugcrowd 🦄Series E · San Francisco, California · founded 2012 · 131 employees$183.7Mraised▾
Provider of crowdsourced security platform offering vulnerability disclosure and penetration testing. The platform facilitates vulnerability submissions from security researchers. It offers penetration testing as a service to meet compliance goals. Red team services simulate real-world threats to uncover risks.
- Nov 2024Conventional Debt$50M
- Feb 2024Series E$102M
- Mar 2020Series D$30M
- Mar 2018Series C$26M
#4
Series C · San Francisco, California · founded 2013 · 6 employees$20.1Mraised▾
API security platform delivering complete protection against attacks and abuse. It is a B2B SaaS company that provides a comprehensive solution for application and API security. The platform offers advanced API security, including API discovery, security testing, and abuse prevention. It helps organizations discover all APIs, detect and stop attacks, respond to incidents, and test APIs for security issues. It caters to various industries, including technology, healthcare, fintech, and e-commerce, and supports multiple cloud platforms like AWS, GCP, and Azure. The platform provides real-time API threat protection, AI agent security, and API SOC services. It offers features such as credential stuffing detection, API leak management, and cloud-native WAAP. The company focuses on protecting APIs and AI agents from threats, providing visibility, automated response, and integrations.
- Jul 2025Series C$55M
- Sep 2023Series A$9.2M
- Oct 2018Series A$8M
- Dec 2016Series A$2.3M
#5
Series B · San Francisco, California · founded 2014 · 125 employees$19.2Mraised▾
Cloud based platform offering software for automated testing. The platform allows web users to record and run functionality test cases by just pointing and clicking. Users can schedule and run tests on different browsers. Members can capture mobile website workflows in a browser environment and run tests on the cloud to ensure that the site runs properly on the web and mobile. Provides a dashboard to measure and check the load and performance of the website. Provides integration for GitHub, circle ci, Heroku, Jenkins and Jira.
- Aug 2025Series B$41M
- Jul 2021Series A—
- Mar 2019Series A$16M
- Feb 2018Seed$2.5M
#6
Series D · San Francisco, California · founded 2017 · 146 employees$93Mraised▾
Platform offering code analysis and review solutions. It leverages AI that analyzes the code and identifies bugs and vulnerabilities. The platform analyzes code in the commit, editor, and CI pipeline. It supports programming languages such as Java, python, and more.
- Feb 2025Series D$100M
- Apr 2023Series C$53M
- Jul 2021Series B$27M
- Oct 2020Series A$13M
#7
Series D · San Francisco, California · founded 2018$108.7Mraised▾
Provider of AI-powered cloud platform for software testing and quality engineering. The platform offers tools for test creation, authoring, orchestration, and insight generation. It supports agent-to-agent testing, auto-healing, visual testing, and root cause analysis. The platform provides capabilities for cross-browser testing, real device testing, and automation testing. It facilitates accessibility testing, performance testing, and API testing.
- Dec 2024Series D$38M
- Sep 2022Grant (prize money)$250K
- Mar 2022Series C$45M
- Jun 2021Series B$16M
#8
Seed · San Francisco, California · founded 2019$7.5Mraised▾
AI powered software solutions to automate debugging and root-cause analysis of software issues. It mitigates software outages by leveraging artificial intelligence to understand codebases and telemetry data, including metrics and events. It offers distributed systems for identifying issues, and employs a microservice-based architecture to facilitate its operations.
- Nov 2025Seed$7.5M
#9
Series A · San Rafael, California · founded 2018 · 135 employees$25Mraised▾
Platform offering security testing software. The platform identifies any vulnerabilities in the application. It automatically tests every aspect of applications, APIs web sockets, or mobile. The platform leverages AI to understand the application architecture and generate sophisticated and targeted attacks.
- May 2025Series A$1M
- Mar 2022Series A$20M
- Oct 2020Seed$4.7M
#10
Series C · Los Altos, California · founded 2011 · 15 employees$57Mraised▾
Developer of AI-powered tools for website and mobile app accessibility. The tools automatically find, cluster, track, and prevent accessibility bugs. The AI sees each screen the way a sighted human would. It classes, clusters, and prioritizes issues into common coding problems. The system integrates with existing automated testing systems for web and mobile.
- Dec 2024Series C$55M
- Jun 2022Series B$38M
- Feb 2021Series A$17M
#11
Series B · Dublin, California · founded 2015 · 51 employees$59.1Mraised▾
Provider of AI-powered test automation platform for enterprise resource planning. The platform offers capabilities such as test discovery, pre-built test libraries, and a no-code testing builder. It features AI-enabled self-healing scripts, impact analysis, and reporting dashboards. The platform supports various applications and integrations. It helps streamline configuration, accelerate test automation, and reduce implementation costs.
- Aug 2024Series B$47M
- Sep 2022Series A$8M
- Dec 2017Seed$1.4M
- Mar 2017Seed$750K
#12
Seed · San Francisco, California · founded 2022 · 9 employees$10Mraised▾
AI powered performance testing platform. Its AI generates functional and performance tests in real time. The platform integrates with CI and CD pipelines to streamline the testing process. It enables developers to choose the criteria to test the application.
- Jun 2025Seed$10M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Software Testing Tools coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.