Q Bio is a Redwood City, California health-technology company offering the Q Exam and the Q Bio Health Dashboard, sold directly at its clinic and through ent...
Q-CTRL builds infrastructure software to power the quantum future, delivering AI-driven quantum control, error-suppression, and performance-management tools ...
Q2 Holdings is a financial services software company that provides digital banking, lending, and embedded finance solutions to banks, credit unions, and fint...
QA Wolf is a hybrid platform and service that takes QA off software teams' plates: AI maps an application's user journeys, converts plain-language prompts in...
Qarbotech (Qarbotech Sdn Bhd) is a Malaysian agritech and nanotechnology company that develops biocompatible organic compounds to optimize plant photosynthes...
Qardy is the first online lending aggregator marketplace in Egypt and the wider MENA region, connecting micro, small, and medium enterprises (MSMEs) with ban...
Qargo is an intelligent transport management platform (TMS) for road carriers, freight forwarders and 3PLs, using AI to automate operational and administrati...
Qase is a cloud test management platform (TestOps) for QA and engineering teams to author test cases, organize them into suites and plans, launch and complet...
Qatar University is the national public research university of the State of Qatar, located in Doha, and ranked #122 in the QS World University Rankings 2025....
QBE Insurance Group Limited is a Sydney-headquartered, ASX-listed global general insurance and reinsurance group, tracing back to 1886 in Townsville, Queensl...
Qbiq is an AI-powered space planning and architectural visualization platform for real estate. It lets brokers, architects, developers, and space planners ge...
QED Investors is a global venture capital firm founded in 2007 by Nigel Morris and Frank Rotman, both early leaders at Capital One, and headquartered in Alex...
Qentaz (now operating under the brand Trazo) is a Colombian fintech providing collections, payments, disbursements, fraud control and reconciliation infrastr...
QEP Resources was an independent natural gas and crude oil exploration and production company headquartered in Denver, Colorado, with operations in the Unite...
Qevlar AI is an autonomous Security Operations Center (SOC) platform that investigates every security alert the way a top analyst would — without playbooks, ...
QFEX is the first 24/7 exchange built exclusively for US equities, commodities, and FX, offering high-leverage perpetual futures on traditional assets withou...
QGenda is a healthcare workforce management platform used by hospitals, health systems, medical groups, and academic medical centers for physician and staff ...
QiDZ Holding operates theQapp (formerly QiDZ), a consumer mobile platform that helps families discover, compare, and book activities, entertainment, and dini...
Qiming Venture Partners is a leading China-based venture capital firm founded in 2006 by Duane Kuang and Gary Rieschel, headquartered in Shanghai with additi...
Qingflow (轻流) is an AI-powered no-code and low-code business management platform that lets enterprises build digital operations systems — forms, workflows an...
Qiniu Cloud (七牛云) is a data-centric cloud infrastructure platform for storing, delivering, processing, and computing over large-scale unstructured data. Its ...
Qiwi provides payment reception, payouts, and banking platform APIs for processing wallet, card, mobile, and SBP transactions across Russia and CIS markets.
QLC is a company surfaced as a portfolio company of 500 Global and added to the API Evangelist network as a stub for enrichment. Its listed website resolves ...
APIs for Qlik Sense, a business intelligence and data analytics platform providing engine, repository, cloud, embedding, and data integration capabilities.
Collection of APIs for Qlik Sense, a business intelligence and visual analytics platform. Qlik provides REST APIs, WebSocket APIs, and developer tools for ma...
QlikView is a business intelligence and data visualization platform that enables users to create guided analytics applications and dashboards for data discov...
Qlub is a hospitality payments and digital-menu technology company enabling contactless pay-at-table, order-and-pay, digital menus, secure payment links, a q...
Qminder is a cloud-based queue management and appointment scheduling platform that helps retail, healthcare, government, and education organizations manage v...
Qobuz is a French hi-res audio streaming and download platform founded in 2007 and operated by Xandrie SA. It offers lossless FLAC streaming up to 24-bit/192...
Qogita is Europe's B2B wholesale marketplace for the health and beauty sector, connecting retailers to a combined catalog of more than 500 suppliers and dist...
Qognify is an enterprise physical-security software provider whose portfolio spans video management systems (Ocularis, Qognify VMS formerly Cayuga, and NiceV...
Qognitive, Inc. is an AI company that develops QCML (Quantum Cognition Machine Learning), an analytical AI architecture positioned as an alternative to class...
Qomplement is a San Francisco-based Y Combinator (Spring 2026) company building an AI-native platform for supply chain and document-heavy back-office operati...
Quality of Service (QoS) is the description or measurement of overall performance of a service, particularly in computer networking and telecommunications. Q...
Qover is a Brussels-based insurtech providing an API-first embedded insurance orchestration platform used across 32 European countries. Its modular platform ...
QphoX is a Delft, Netherlands-based quantum technology company founded in 2021 and spun out of Delft University of Technology (TU Delft). It develops quantum...
Qpoint is a security and observability company that uses eBPF to give teams full visibility and control over egress and service-to-service traffic without pr...
Public QR code generation API by Brand Aspect Ltd supporting 27+ payload types (URL, WiFi, vCard, payments) with six export formats, bulk generation, and cap...
Public REST API and agent-native QR code generation platform by Brand Aspect Ltd, offering static QR generation across 27 payload types, six export formats, ...
QStash is a serverless message queue and task scheduling REST API from Upstash that delivers HTTP messages to endpoints reliably without requiring any long-l...
Qt Group is a global software company that builds cross-platform development, design, and quality-assurance tools used across more than 70 industries and bil...
Quad/Graphics is a worldwide marketing solutions company that provides print and integrated marketing services helping marketers reach today's consumers acro...
Quadratic is an AI-native infinite spreadsheet that combines Python, SQL, JavaScript, formulas, and AI agents on a single canvas, with live connections to da...
Quadric is a semiconductor IP company based in Burlingame, California that licenses the Chimera GPNPU (general-purpose neural processing unit) processor IP a...
Quadrillion Labs builds Qualia, an AI coding agent for researchers that runs hundreds of agents in parallel to compress weeks of research into hours. Qualia ...
Quago Technologies is a gaming analytics and fraud-detection company that uses machine learning and mobile device sensor data to protect and optimize mobile ...
Quai Network is a sharded, EVM-compatible proof-of-work Layer-1 blockchain built by Dominant Strategies, featuring two native assets: QUAI, a smart-contract ...
Quaker Houghton is a major US corporation and Fortune 1000 company. The Quaker Houghton API provides programmatic access to its platform services, data, and ...
Qualifi is a recruiting and hiring platform that streamlines candidate screening through asynchronous, voice-based phone interviews, automated scheduling, an...
Quality Of Service provides specialized quality of capabilities delivered as a managed offering, often accessible via APIs or cloud interfaces. It allows org...
Frameworks and benchmarks that define acceptable levels of quality for products, services, or processes to ensure consistency and meet customer expectations....
Quandela is a Paris-region (Massy, France) photonic quantum computing company building modular, scalable, and energy-efficient quantum systems driven by dete...
Nasdaq Data Link (formerly Quandl) provides REST and streaming APIs for financial and economic data including time-series datasets, tabular datasets, and rea...
Quandoo is a restaurant reservations marketplace that connects diners with thousands of restaurants and gives merchants table, reservation, and reputation ma...
Quant Network is a blockchain interoperability company whose Overledger platform provides APIs to issue, connect, and monitor digital assets, smart contracts...
Quanta is a San Francisco-based accounting services company built for SaaS businesses, pairing expert human accountants with proprietary software that "shows...
Quanta Services is a Fortune 500 specialty contracting company that delivers infrastructure solutions to the electric power, renewable energy, oil and gas, p...
Quantcast is a San Francisco-headquartered digital advertising and audience intelligence company founded in 2006. Its flagship offering is the Quantcast Plat...
QuantCDN is an edge delivery, static site hosting, and cloud applications platform that lets teams generate, host, and maintain static and dynamic versions o...
Quantemplate is a data integration and management platform for the insurance industry. It automatically translates, validates, and enriches business-critical...
Quantexa provides decision intelligence solutions using entity resolution and network analytics to help organizations connect disparate data and make better ...
Quantierra (Quantierra Advisors LLC) is a quantitative real estate advisory firm that uses proprietary software to source, analyze, and execute real estate t...
Quantifind is a financial crimes automation company founded in 2009 by physicists Ari Tuchman and John Stockton to extract meaningful risk signals from large...
Quantinuum is an integrated quantum computing company formed by the 2021 merger of Honeywell Quantum Solutions and Cambridge Quantum. It builds trapped-ion (...
Quantive is a strategy-execution and OKR (Objectives and Key Results) software company, originally launched as Gtmhub and rebranded to Quantive in 2021. Its ...
Quantive (formerly Gtmhub) is a strategy-execution and OKR (Objectives and Key Results) SaaS platform, historically backed by Insight Partners. The company a...
Quantopian was a Boston-based crowd-sourced quantitative investment firm and algorithmic-trading platform (backed by a16z and Bessemer Venture Partners) wher...
Quantum Art is a quantum computing company building best-in-class, scalable quantum computers for commercial applications. Its technology combines advanced m...
Quantum Machines is a Tel Aviv, Israel-based quantum control company that builds the Quantum Orchestration Platform (QOP) — a unified hardware and software s...
Quantum Metric is a continuous product design and digital experience intelligence platform that captures and quantifies every user session across web and mob...
Quantum-Systems GmbH is a Gilching/Munich, Germany-based dual-use drone manufacturer founded in 2015 by former Bundeswehr helicopter pilot Florian Seibel. Th...
QuantumDiamonds (QD) is a Munich-based German deep-tech company that develops diamond-based quantum sensing systems for semiconductor inspection and failure ...
Quarkus is a Kubernetes-native Java framework tailored for GraalVM and OpenJDK HotSpot, designed to build cloud-native microservices and serverless applicati...
Quarterzip builds AI screenshare agents that deliver real-time, in-product user assistance. Its agent sees a user's screen, guides them by voice, and execute...
Quasar (QuasarDB, by Bureau 14) is a distributed, high-performance time-series database built for the hardest data problems, where precision, speed, scale, a...
Quay is a container image registry that enables you to build, store, distribute, and deploy container images with built-in security scanning, access controls...
Qube Horizon is a platform described as offering project management, resource allocation, and analytics services. No public website or API documentation coul...
Qubiqle is an early 500 Startups (500 Global) portfolio company that became Plate IQ and today operates as Ottimate (qubiqle.com redirects to ottimate.com). ...
Qubrid AI is a cloud platform that provides GPU-accelerated infrastructure and AI services for enterprise developers. Their developer platform offers OpenAI-...
Queen Mary University of London (QMUL) is a public research university in London, United Kingdom, and a member of the Russell Group, ranked #120 in the QS Wo...
Queen's University at Kingston is a public research university in Kingston, Ontario, Canada, serving more than 25,000 students and ranked #193 in the QS Worl...
Queen's University Belfast is a Russell Group research-intensive university in Northern Ireland, United Kingdom, founded in 1845, and ranked #206 in the QS W...
Queensland Geoscience Data is a state government open-data portal for Australia running CKAN. It exposes the CKAN catalog API, a standardized machine-readabl...
Queensland Government Data is a open data portal open-data portal for Australia running CKAN. It exposes the CKAN catalog API, a standardized machine-readabl...
Queensland University of Technology (QUT) is a public research university based in Brisbane, Australia, ranked #213 in the QS World University Rankings 2025....
Quenza is a digital care and client-engagement platform for coaches, therapists, and other helping professionals. Practitioners build activities - worksheets...
QuEra Computing is a Boston-area neutral-atom quantum computing company, founded in 2021 by scientists from Harvard and MIT. Its flagship system, Aquila, is ...
Quero Educação is a Brazilian education-technology company that operates a marketplace connecting students with higher-education institutions across Brazil. ...
Quest Diagnostics is a Fortune 500 company and the world's leading provider of diagnostic information services that patients and doctors can rely on to make ...
Quest Software Inc. is a privately held IT management and cybersecurity software company headquartered in Aliso Viejo, California. Its portfolio spans databa...
QuestDB is a high-performance open-source time-series database. It exposes three programmatic surfaces — an HTTP REST API for SQL queries and CSV import/expo...
QuickBooks is Intuit's accounting software platform for small businesses, self-employed, and accountants, available as QuickBooks Online (cloud) and QuickBoo...
QuickBooks Online is Intuit's cloud accounting platform for small and mid-sized businesses, providing invoicing, expense tracking, payroll, reporting, sales ...
The QuickBooks Online Accounting API is Intuit's REST API for reading and writing the core accounting entities of a QuickBooks Online company file, including...
Quickoffice was a mobile office productivity suite (document, spreadsheet, and presentation editing for iOS, Android, and Symbian) that was acquired by Googl...
QuickShipper is a last-mile delivery and fleet management SaaS platform that helps businesses manage order fulfillment and deliveries. It provides route opti...
Cloud-native search engine for log management and full-text search with a REST API for indexing documents, running queries, and managing search indexes at pe...
QuidelOrtho is a diagnostics company that transforms diagnostic data into action across the entire healthcare spectrum, from home testing to hospital laborat...
Quikr is India's leading online classifieds platform, describing itself as "India's no. 1 online classifieds platform" for buying, selling, and renting acros...
Quilter is a physics-driven AI platform that automates printed circuit board (PCB) placement and routing. Using reinforcement learning, it converts a schemat...
Quince is a direct-to-consumer e-commerce retailer selling high-quality essentials at radical prices across apparel, home goods, bedding, furniture, accessor...
Quintessent is a deep-tech photonics startup based in Goleta, California, developing optical connectivity solutions that address the communication bottleneck...
Quintiles Transnational Holdings was a Fortune 500 contract research organization (CRO) that provided biopharmaceutical development and commercial outsourcin...
Quinyx is an AI-powered workforce management (WFM) platform for frontline organizations, covering scheduling, demand forecasting, time tracking, labor law co...
Quip is a Salesforce-owned collaborative productivity platform that combines documents, spreadsheets, chat, and tasks into a single workspace tightly integra...
Quiq is an enterprise conversational AI and customer-experience platform for building, deploying, and governing agentic AI systems across digital and voice c...
Quirrel is an open source job queueing and workflow scheduling service designed for serverless and containerized JavaScript and TypeScript applications. It e...
Quissly, Inc. is a Delaware-based SaaS company building an AI-powered search and conversational commerce platform for online stores. Its two products, QSearc...
Quiver Quantitative is an alternative-data platform that aggregates non-traditional financial datasets and exposes them through a single API. The platform co...
QuizAPI provides programmatic access to thousands of quiz questions across topics such as programming, science, mathematics, and general knowledge. Developer...
Quizlet is a San Francisco-based global learning platform offering flashcards, practice tests, and AI-powered study tools used by students, teachers, and lif...
Qumulo is an enterprise data platform company that delivers a single, unified file and object storage system spanning on-premises data centers, the edge, and...
Qunar (去哪儿网, "where to go") is a Chinese online travel platform founded in 2005 and headquartered in Beijing. It operates a travel search and booking service...
Quo (formerly OpenPhone) is an AI-powered business communication platform that unifies calls, texts, and contacts in one shared workspace for startups and sm...
QUODD is a cloud-native market data provider delivering real-time, delayed, historical, end-of-day, and point-in-time pricing, plus reference data, a securit...
Quorum Software is a leading provider of energy software for upstream oil and gas operations, providing solutions for land management, royalty accounting, pr...
QuotaPath is a sales commission tracking and compensation management platform that helps revenue, finance, and sales operations teams design, automate, and a...
Quote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathamesh More (pprathameshmore) in Node.js + Express + Mo...
Qurate Retail Group is a leader in video and online commerce that includes seven retail brands: QVC, HSN, Zulily, Frontgate, Ballard Designs, Garnet Hill, an...
QVC is a multinational corporation specializing in televised home shopping owned by Qurate Retail Group, broadcasting to millions of households worldwide and...
Qventus is a healthcare technology company that provides an AI-powered automation platform for hospital operations. Its "AI teammates" combine machine learni...
Qwak is an end-to-end production machine learning platform that lets data science and ML engineering teams build, train, deploy, monitor, and manage models w...
Qwen is Alibaba's large language model family, including Qwen3-Max, Qwen3.5-Plus, Qwen3.5-Flash, Qwen3-VL (vision), Qwen-Coder, Qwen-Audio, and Qwen open-sou...
Qwiet AI (formerly ShiftLeft, now part of Harness) is an application security testing platform delivering SAST, SCA, IaC, container, and secrets scanning in ...
Qwiet AI (by Harness, formerly ShiftLeft) is an application security testing platform that unifies SAST, SCA, secrets, IaC, and container scanning with AI-as...
Qwikwire, now operating as Aqwire, is a Philippine-founded cross-border payments company backed by 500 Global that bridges international payers with Philippi...
Qwil (qwil.co) is a financial-technology company and a 500 Global portfolio company. It operates a consumer-facing web and mobile application ("Qwil WebApp" ...
Qwilr is a document-experience platform for creating interactive, web-based sales proposals, quotes, contracts, and reports that replace static PDFs. Beyond ...
Qwilt operates a global content delivery network built on the Open Edge Cloud — a true edge cloud with thousands of deeply embedded caching nodes inside serv...
QXO is a publicly traded company focused on building a tech-forward leader in the building products distribution industry through acquisitions and operationa...