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84 Top San Francisco Developer APIs Companies and Startups of 2021 - Best Startup US

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

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Algolia

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

RevenueCat

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Mux

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Extend

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

MuleSoft

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Prismic

Crunchbase Website Twitter Facebook Linkedin

Headless CMS with an API, CDN and a Writing Room

Algolia

Checkr

Crunchbase Website Twitter Facebook Linkedin

Checkr seeks to automate the process of professional background checks.

Algolia

SightCall

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Kong

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Lob

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

RapidAPI

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Merge

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

OPSWAT

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Deepgram

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Treasury Prime

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Womply

Crunchbase Website Twitter Facebook Linkedin

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

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

HelloSign

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Tetrate

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Unit21

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

PubNub

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Courier

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Pachyderm

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Token Transit

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

WorkOS

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Firebase

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Aquarium

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Finch

Crunchbase Website Twitter Facebook Linkedin

Finch is the universal API for Payroll and HR

Algolia

MonkeyLearn

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Kover

Crunchbase Website Twitter Facebook Linkedin

Kover develops micropremium products for consumers’ everyday pain points.

Algolia

Stytch

Crunchbase Website Twitter Facebook Linkedin

Stytch improves security and user experience with passwordless authentication.

Algolia

ReadMe

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Plivo

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Alchemy

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Postman

Crunchbase Website Twitter Facebook Linkedin

Postman is the collaboration platform for API development.

Algolia

Wage

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Pixie

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Nexmo

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Citadel – Payroll APIs

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

DeepSource

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Automate.io

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Stronghold

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Swiftype

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Apisec.ai

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

BetterDoctor

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Autocode

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Airbrake.io

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Apiary

Crunchbase Website Twitter Facebook Linkedin

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

Crunchbase Website Twitter Facebook Linkedin

Build Better APIs with Moesif API Analytics

Algolia

Upcall

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

TrueCare24

Crunchbase Website Twitter Facebook Linkedin

In-Home Senior Care Automation Platform

Algolia

Mashery

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Authy

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

ModernTax

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Timekit

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Kimono Labs

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Jido Maps

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Runscope

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Grokstyle

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Seam

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

isocket

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Agnitus

Crunchbase Website Twitter Facebook Linkedin

Agnitus is a developer of touch-enabled learning applications.

Algolia

Protonet

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Bitext

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Driven, Inc.

Crunchbase Website Twitter Facebook Linkedin

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

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

People Data Labs

Crunchbase Website Twitter Facebook Linkedin

People Data Labs builds people data.

Algolia

Lang API

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Hannah Systems

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

VoiceLayer

Crunchbase Website Twitter Facebook Linkedin

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

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Telesocial

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Guidebox

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Basilica

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Bitbutter

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

RingCaptcha

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

Dacast

Crunchbase Website Twitter Facebook Linkedin

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

Algolia

AssemblyAI

Crunchbase Website Twitter Facebook Linkedin

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

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