Developer Tools Startups

Fidel API provides a suite of financial infrastructure APIs that enable developers to build real-time, card-connected payment experiences for users and merchants. The company serves developers and businesses in the payments and fintech ecosystem.

3 investors

Filebase provides S3-compatible object storage with high-speed uploads and downloads, free egress, and a verifiable fingerprint for every object. It targets developers building and scaling applications, offering storage priced at $15/TB and support for IPFS and existing AWS CLI workflows.

3 investors

Filuta AI builds neurosymbolic AI agents that automatically test complex interactive software and produce reproducible, auditable coverage evidence, aimed at teams shipping regulated systems. Its engine combines symbolic AI planning with machine learning and is used for applications such as automotive cockpit software testing and procurement-compliance screening.

3 investors

Firecrawl provides an API to search, scrape, and interact with web content at scale, converting live internet data into clean markdown and structured data optimized for large language models, agents, and AI-native applications.

3 investors

Fiveonefour builds tooling focused on agent experience (AX), helping developers ship software that AI agents can use effectively. It targets software teams building products where AI agents act as end users.

3 investors

Flexcompute develops physics simulation software, including the Flow360 CFD and Tidy3D electromagnetic simulation products, used by engineering and R&D teams for product development. This page presents its ecosystem of partners that build solutions on top of its simulation tools.

3 investors

Flixel creates software tools for visual storytelling, including Cinemagraph Pro (for creating animated still images), Flixel Cloud (for hosting and streaming), and Persecond (a timelapse app). The company serves creators and brands who want to produce and share visual content.

3 investors

Floot is a no-code AI app builder that enables users without coding knowledge to create fully functional mobile and web applications by describing their requirements. The platform includes built-in database, backend infrastructure, authentication, hosting, and integrations with third-party services.

3 investors

FloydHub is a Platform-as-a-Service for training and deploying deep learning and machine learning models in the cloud, handling infrastructure setup so developers can focus on model development. It targets machine learning practitioners and data scientists.

3 investors

Fluent.ai offers low-power keyword spotting technology that enables hands-free voice activation on devices through custom branded wake words, optimized for far-field and noisy environments.

3 investors

Fluent is a blockchain platform with a mainnet and testnet that supports "blended" app development, enabling developers to build on-chain applications. It also offers Prints, a product creating a social footprint from a user's identity and reputation across the internet.

3 investors

Flux is a code-first analytics platform that derives engineering insights directly from commits, pull requests, and GitHub repository activity rather than tickets or reported status. It is built for engineering leaders to track system-level progress, risk, and team dynamics during AI-accelerated software development.

3 investors

WP Engine (Flywheel) provides enterprise-grade WordPress hosting infrastructure designed to support high-traffic websites with advanced caching, security, and network optimization. The platform serves digital businesses needing reliable uptime, collaboration tools, and scalable hosting solutions.

3 investors

Mayhem provides AI-powered fuzzing and symbolic execution tools for vulnerability discovery and API testing, designed to reduce noise in software supply chain assessments for development teams.

3 investors

TinaCMS is an open-source, Git-based headless content management system that supports multiple frameworks and static site generators, offering basic and visual editing, multi-branch workflows, and a content query API. It is the successor to Forestry.io and is maintained by SSW.

3 investors

Foxglove builds observability tooling and open-source software for robotics engineers to accelerate development and deployment. The platform serves robotics teams across industries developing autonomous systems and robots.

3 investors

Frigade provides an SDK and AI-powered platform for building product onboarding flows including checklists, tours, and announcements that adapt to product changes. The product serves software companies and product teams looking to implement polished onboarding experiences without building them from scratch.

3 investors

Friz is a platform that consolidates social media content creation, publication, and advertising management across multiple networks into a single interface.

3 investors

Frontity is an open-source framework that enables developers to build performant websites by using WordPress as a headless CMS with a React frontend. The framework is no longer under active development, with the team now contributing to WordPress's native Interactivity API.

3 investors

Fullview provides support teams with cobrowsing and session replay tools that let agents see a user's screen in real time to diagnose and resolve issues, with native integration into ticketing systems. It is a customer support software product aimed at SaaS support teams.

3 investors

Fuser provides a creative platform for layering images, video, text, vectors, and 3D objects with an integrated coding environment, serving designers and creators building visual content.

3 investors

Future AGI provides a platform for simulating, evaluating, and monitoring AI agents in production. The platform helps teams test agents for hallucinations, build guardrails, and continuously improve AI systems across customer support, voice agents, internal tools, RAG systems, and autonomous agents.

3 investors

Gaiia is a platform with developer-focused documentation and APIs designed to help developers build integrations. The company emphasizes data security, compliance, and industry-standard protection for its users.

3 investors

LaunchPoint is a creator marketing platform that connects brands with a network of 50,000+ creators for on-demand content partnerships. The platform automates product seeding, audience targeting, and performance tracking across TikTok, Instagram, and YouTube, with built-in fraud detection and compliance tools.

3 investors