Developer Tools Startups

Reactiv is a Shopify-native platform that enables ecommerce brands to build mobile commerce applications with native integrations across marketing, merchandising, orders, loyalty, support, and data infrastructure. The platform connects seamlessly to existing Shopify stacks and third-party tools like Klaviyo, Loop, and Gorgias, allowing merchants to create personalized mobile shopping experiences with live streaming, recommendations, and customer support without custom middleware.

1 investor

ReactWise develops AI tools for chemistry and chemical engineering, enabling researchers and engineers to accelerate molecular discovery and reaction optimization. The company combines machine learning with chemistry automation and high-throughput experimentation platforms.

1 investor

ReadMe provides API documentation, monitoring, and developer engagement tools for teams building and managing APIs. The platform serves modern API companies and their developer communities.

1 investor

ReadyM builds multiplayer infrastructure and mods that enable community-driven multiplayer experiences in single-player games, starting with WukongMP for Black Myth: Wukong. The company provides tools and platforms for players, modders, and server owners to create customizable multiplayer modes and user-generated content.

1 investor

Real Artists develops a natively-built issue tracker designed for rapid performance on software development projects.

1 investor

Rebar Labs builds MEV-aware infrastructure for Bitcoin, including mining, privacy, and analytics tools such as Rebar Data (a blockchain explorer and developer suite), Rebar API for Bitcoin blockchain data access, and Shield MEV protection. Its products serve protocols, mining operations, and developers building on Bitcoin and metaprotocols.

1 investor

Rebellis AI generates high-quality 3D character animations from text descriptions using machine learning and human motion data, designed for game developers and animation creators.

1 investor

Recce is a data quality and validation platform that automatically detects schema changes, data diffs, and downstream impacts in pull requests before code merges. It helps data teams catch breaking changes and validate data accuracy across migrations and code changes.

1 investor

RecipeUI is an open source tool for testing and debugging APIs that lets non-backend engineers diagnose API failures independently.

1 investor

Rectangle provides a single API that unifies shipment data — including tracking, shipment, and customs data — across a company's transportation network. It targets logistics and supply chain operations teams, aiming to replace manual data entry and legacy EDI systems.

1 investor

Recursal provides an API for accessing thousands of open-source machine learning models without requiring setup or hosting infrastructure. The platform targets developers and businesses building production AI applications.

1 investor

The Recurse Center is a self-directed learning community for programmers, founded in 2011, that helps people direct their own technical education and growth. It operates as a privately held, for-profit business focused on transforming lives through hands-on programming experiences.

1 investor

Recurvia builds Metrana, an experiment-tracking and observability tool originally created for its own AI research on Paramorph, offering metric logging at large scale, first-class support for reinforcement learning workloads, and AI-native analysis with autonomous experimentation. It is being opened up to select machine learning lab partners.

1 investor

Redgate develops database management software that helps organizations automate, secure, and scale their data infrastructure throughout the DevOps lifecycle. The platform serves IT leaders, development teams, and data professionals across enterprise organizations.

1 investor

RedPill provides a privacy-focused AI gateway that routes requests to private GPU models running inside trusted execution environments (TEEs), returning signed receipts, attestation reports, and audit evidence. It offers developers an OpenAI-compatible API aggregating models across networks like Phala, Tinfoil, and NEAR AI, serving regulated industries such as law firms, healthcare, and security companies.

1 investor

Red Planet Labs develops Rama, a software platform that reduces the cost of building scalable backend applications by integrating deployment, monitoring, and maintenance in a single tool. The platform targets software engineers and organizations building large-scale applications across industries.

1 investor

Redspread provides a deployment tool that allows teams to move containerized applications to Kubernetes clusters via command line. It targets developers and DevOps teams managing multiple software environments.

1 investor

RedwoodSDK is a software development framework, presented through its blog and version 1.0 release. The page provides limited detail beyond announcing the framework's 1.0 release.

1 investor

Refined Sites for Confluence enables organizations to build custom intranets, documentation sites, and knowledge bases by organizing Confluence content into branded, user-friendly websites without requiring code. The product serves teams and enterprises that need to surface and personalize Confluence information across different user groups.

1 investor

RefineTrain AI provides a service that processes internal company documentation using AI agents to resolve inconsistencies, clarify ambiguous terminology, and add contextual information, making the knowledge base more suitable for use with large language models and retrieval systems.

1 investor

Reflect is a stablecoin API and SDK that lets developers add yield-bearing savings accounts, launch branded yield-bearing stablecoins, and offer opt-in insurance and risk tranching within their apps. It targets teams building stablecoin and crypto financial products, using yield sources such as DeFi protocols, T-bills, and money markets.

1 investor

1 investor

Reflect is an AI-powered, no-code testing platform that allows developers and testers to write automated tests for web applications faster.

1 investor

Reframe operates a marketplace where hardware teams source both commercial off-the-shelf and custom manufactured components, leveraging relationships with suppliers experienced in producing parts for established consumer hardware products and using AI agents to automate the procurement process.

1 investor