84 Top San Francisco Developer APIs Companies and Startups of 2021

June 18, 2021

This article showcases our top picks for the best San Francisco based Developer APIs companies. These startups and companies are taking a variety of approaches to innovating the Developer APIs industry, but are all exceptional companies well worth a follow.

We tried to pick companies across the size spectrum from cutting edge startups to established brands.

We selected these startups and companies for exceptional performance in one of these categories:

  • Innovation
    • Innovative ideas
    • Innovative route to market
    • Innovative product
  • Growth
    • Exceptional growth
    • Exceptional growth strategy
  • Management
  • Societal impact

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Top San Francisco Developer APIs Startups

Data sourced from Crunchbase and SemRush.

Nylas

Nylas

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Nylas is an API platform that helps developers build features that connect to every email, calendar, and contacts provider in the world.

Algolia

Algolia

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Algolia is the Search-as-a-Service platform that enables companies to deliver fast and relevant digital experiences that drive real results.

Algolia

RevenueCat

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RevenueCat is a mobile subscription toolkit that makes it easy to build and manage in-app purchases and subscriptions.

Algolia

Mux

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Mux is a video platform designed to make video streaming and analytics possible for every development team.

Algolia

Extend

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Extend provides extended warranties as a service to merchants and innovates the broken customer experience associated with them.

Algolia

MuleSoft

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MuleSoft provides an integration and API platform that makes it easy to connect data from any system to create connected experiences.

Algolia

Prismic

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Headless CMS with an API, CDN and a Writing Room

Algolia

Checkr

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Checkr seeks to automate the process of professional background checks.

Algolia

SightCall

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SightCall is a live video SaaS enabling visual support for enterprises enriched by Augmented Reality and Artificial Intelligence insights.

Algolia

Kong

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Kong is the cloud-connectivity company offering the industry-leading service connectivity platform designed for modern architectures.

Algolia

Lob

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Lob provides direct mail and address verification APIs which allows businesses to send personalized mail to their customers.

Algolia

RapidAPI

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RapidAPI is an API marketplace that enables developers to find and connect to APIs.

Algolia

Merge

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One API to integrate with all HR, payroll, recruiting, and accounting platforms.

Algolia

OPSWAT

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OPSWAT protects critical infrastructure by enabling the safe transfer of files and devices to and from secure environments.

Algolia

Deepgram

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Deepgram is a technology startup that develops an enterprise-focused automatic speech transcription and analysis platform.

Algolia

Treasury Prime

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Treasury Prime is a Banking-as-a-Service company that connects banks and FinTechs through an API.

Algolia

Womply

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A local commerce platform that provides apps, APIs, marketing, and financial tools for over 500,000 American businesses.

Algolia

Apollo

Crunchbase Website Twitter Facebook Linkedin

Apollo is the GraphQL company. Its Data Graph Platform helps developers, startups, and enterprises get the most out of GraphQL.

Algolia

Clearbit

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Clearbit develops business intelligence to help companies find more information of customers in order to increase sales and reduce fraud.

Algolia

HelloSign

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HelloSign offers fast, secure, and legally binding eSignatures for businesses.

Algolia

Tetrate

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Tetrate provides enterprise-ready service mesh for all workloads and all environments.

Algolia

Unit21

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Unit21 is a platform that provides no-code tools and services for risk and compliance teams.

Algolia

PubNub

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The PubNub Data Stream Network enables mobile and web developers to build and scale realtime apps.

Algolia

Courier

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The fastest way for developers to build notifications for their app. Email, SMS, push, chat, and more.

Algolia

Pachyderm

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Pachyderm is an enterprise-grade data science platform that makes explainable, repeatable, and scalable AI/ML a reality.

Algolia

Token Transit

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Token Transit is a provider of a mobile ticket booking application intended to help riders pay for transit via a mobile application.

Algolia

WorkOS

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WorkOS provides APIs to make applications enterprise-ready, with pre-built features and integrations required by IT admins.

Algolia

Firebase

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Firebase is Google’s mobile platform that develops apps that grow users base on iOS, Android, or the Web.

Algolia

Aquarium

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Aquarium is expertise in making machine learning accessible to its customers that helps to simplify their models by improving datasets.

Algolia

Finch

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Finch is the universal API for Payroll and HR

Algolia

MonkeyLearn

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MonkeyLearn is a Text Analysis platform with Machine Learning to automate business workflows and save hours of manual data processing.

Algolia

Kover

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Kover develops micropremium products for consumers’ everyday pain points.

Algolia

Stytch

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Stytch improves security and user experience with passwordless authentication.

Algolia

ReadMe

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ReadMe provides every company the ability to quickly create beautiful documentation, and build loyal, productive developer communities.

Algolia

Plivo

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Plivo is a leading cloud communication platform that helps companies quickly program voice and SMS capabilities into their applications.

Algolia

Alchemy

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Alchemy is a developer platform that helps companies to build reliable decentralized applications.

Algolia

Postman

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Postman is the collaboration platform for API development.

Algolia

Wage

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Verix is a seamless APIs for real-time income and employment verification.

Algolia

Pixie

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At Pixie Labs, we build machine intelligence systems which empower developers to engineer the future.

Algolia

Nexmo

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Nexmo provides innovative communication SMS and Voice APIs that enable applications and enterprises to easily connect to their customers.

Algolia

Citadel – Payroll APIs

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With Citadel, users can easily connect their payroll account and instantly verify employment, income, and identity.

Algolia

DeepSource

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Deepsource is an enterprise tech startup that provides an automated tool to review codes.

Algolia

Automate.io

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Use tens of cloud apps? Connect them the way you want. Sync data, automate workflows – marketing, sales and more.

Algolia

Stronghold

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Stronghold creates virtual payment networks that give developers access legacy and next-generation payment networks through a simple API.

Algolia

Swiftype

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Swiftype is a provider of SaaS-based site and enterprise search platform used to fully customize the search experience on websites.

Algolia

Apisec.ai

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Apisec.ai is an enterprise-class API security management platform that delivers instant and continuous API security coverage and compliance

Algolia

BetterDoctor

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BetterDoctor, a technology company, delivers provider directory data and has a database that can be accessed through a responsive API.

Algolia

Autocode

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An online code editor with API autocomplete, instant hosting, and a Standard Library. Sync data, build bots and customize workflows.

Algolia

Airbrake.io

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Airbrake is an error tracking company that collects and aggregates errors in web apps for developers.

Algolia

Apiary

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Apiary provides tools that help companies build, test, monitor, and document web APIs.

Algolia

Apres

Crunchbase Website Twitter Facebook Linkedin

Apres is an analytics platform built to scale and explain AI decision making.

Algolia

Moesif

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Build Better APIs with Moesif API Analytics

Algolia

Upcall

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Upcall is the human-powered outbound sales & marketing calling platform.

Algolia

TrueCare24

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In-Home Senior Care Automation Platform

Algolia

Mashery

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Mashery is a TIBCO company providing API management services that enable companies to leverage web services as a distribution channel.

Algolia

Authy

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Authy provides an API for developers to customize the user experience when adding two-factor authentication and multiple add-ons for apps.

Algolia

ModernTax

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ModernTax is API platform that democratizes access to tax records for business services companies.

Algolia

Timekit

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Timekit empowers developers and designers through a set of unified APIs that deliver the entire booking infrastructure.

Algolia

Kimono Labs

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Kimono Labs is an online platform that allows its users to convert their websites into APIs.

Algolia

Jido Maps

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Jido Maps is a software company that offers an API for persistent augmented reality.

Algolia

Runscope

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Runscope develops tools that support the modern application development life cycle.

Algolia

Grokstyle

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Grokstyle develops an app that automatically identifies furniture and home decor from just about any picture or angle.

Algolia

Seam

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Seam is an API for developers to control homes and buildings.

Algolia

isocket

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isocket offers a technology platform that is focused on buying and selling fixed price inventory.

Algolia

Agnitus

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Agnitus is a developer of touch-enabled learning applications.

Algolia

Protonet

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Protonet provides a cloud-based social project management and collaboration platform.

Algolia

Bitext

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Bitext develops the most accurate multilingual text analysis engines in the market such as middleware for chatbots and lemmatization.

Algolia

Driven, Inc.

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Driven, Inc. is the industry leader in Big Data application development and performance management solutions.

Algolia

3scale

Crunchbase Website Twitter Facebook Linkedin

3scale’s API management platform empowers API providers to easily package, distribute, manage and monetize APIs.

Algolia

Netifi

Crunchbase Website Twitter Facebook Linkedin

The next-generation microservices platform.

Algolia

OneID

Crunchbase Website Twitter Facebook Linkedin

OneID is an identity and security platform for the IoT and web connected world, including devices, servers, applications, and humans.

Algolia

Berbix

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Berbix develops identity verification software that uses machine learning techniques to instantly spot fraud.

Algolia

People Data Labs

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People Data Labs builds people data.

Algolia

Lang API

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LangAPI exists to help developers rapidly translate and localize their apps for users worldwide.

Algolia

Hannah Systems

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Partnering with cities to deliver the next generation of open and ethically managed traffic data.

Algolia

VoiceLayer

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Real-time Push-to-Talk PaaS Add realtime Push-to-Talk (PTT) to any app with our simple API/SDK! Push-to-Talk: Messages are streamed rea

Algolia

Pepper

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Pepper provides an API that helps health, food, insurance, and technology companies build better user experiences.

Algolia

Telesocial

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TeleSocial is an integrated voice and IP service that connects voice calls through social media.

Algolia

Guidebox

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Guidebox is the data layer that powers universal search and discovery for movies and TV across the OTT landscape.

Algolia

Basilica

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Basilica is an API that embeds high-dimensional data like images and text.

Algolia

Bitbutter

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Crypto-asset account aggregation API for fintechs and financial institutions.

Algolia

RingCaptcha

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RingCaptcha provides SMS and voice verification services, as well as SMS traffic analytics, monitoring and anti-fraud protection.

Algolia

Dacast

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Dacast offers API-based and easy-to-use streaming solutions to host, manage, monetize and deliver OTT video worldwide.

Algolia

AssemblyAI

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AssemblyAI is an applied artificial intelligence company that uses deep learning technology to develop practical products.

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