Developer Tools Startups

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

1 investor

The Recurse Center runs a self-directed educational retreat for programmers of all experience levels who want to improve their skills, funded through an integrated recruiting agency that offers optional personalized recruiting services to community members seeking new jobs.

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

Redis provides an in-memory data platform for building real-time applications and AI agents, offering a managed cloud service, self-managed enterprise software, and free open-source software. Its features include vector search for retrieval-augmented generation, tiered RAM plus flash storage, and multi-region replication.

1 investor

Redspread is a collaborative deployment tool that manages software environments from development to production, letting developers deploy Docker projects to a Kubernetes cluster with a single command. It serves software and DevOps teams working with containerized applications.

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

Refacto provides AI-assisted pull request reviews that detect issues such as slow database queries and security gaps, generate PR summaries with sequence diagrams, and offer one-click code fix suggestions. It supports 30+ languages and frameworks and integrates with GitHub, Bitbucket, Azure Repos, and GitLab for software development teams.

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

Reflow is an MCP server that connects to AI coding agents (such as Claude Code, Cursor, or Codex), letting the agent drive a real cloud browser in plain language to author and run end-to-end tests that execute against every PR preview. It compiles test flows to a deterministic format, performs perceptual visual diffing against a baseline, and posts merge-blocking checks and reviewable diffs directly into pull requests.

1 investor

Refractive Labs develops design tooling for silicon photonics, aiming to automate and accelerate the creation of photonic chips used in data center and AI compute interconnects. It targets the semiconductor and photonics industry, where optical links increasingly replace electrical interconnect for high-bandwidth, low-latency computing.

1 investor

Reframe built tools to model and visualize the architecture of software codebases. The company has since shut down.

1 investor

Reftab is asset management software that lets companies track IT hardware, software licenses, equipment, and maintenance across teams and locations in one platform. It also supports IT spend management and employee on/offboarding, serving IT and operations teams that want to replace spreadsheet-based tracking.

1 investor

ReJot is an open-source software development platform or toolkit. The page provides limited concrete details about its specific offerings or target customers.

1 investor

Released is a software company that builds Jira-native products for product teams to plan work, collect customer feedback, publish audience-specific roadmaps, and turn completed Jira work into release notes. Its products include Hub and BetterBoard, both built on top of Jira as the source of truth.

1 investor

Releem is a database advisor that continuously analyzes MySQL, MariaDB, and PostgreSQL databases to detect performance, reliability, and security risks and recommend prioritized, human-approved fixes. It serves founders, CTOs, developers, DevOps, and hosting providers who run production databases without a dedicated DBA.

1 investor

remio is an AI assistant that automatically captures and synthesizes knowledge for software engineers, helping them manage fragmented technical information across multiple sources and retrieve insights on demand.

1 investor

Remix is a full-stack JavaScript web framework that provides server, router, data layer, UI components, and testing capabilities for building web applications. The framework supports both human developers and AI agents in creating anything from simple projects to complex business applications.

1 investor

Remotion is a multiplayer collaboration app for software teams that offers simultaneous screensharing for up to 10 people, shared cursors and control, keyboard-first commands, and AI-generated session summaries and action items. It integrates with tools like Linear, Raycast, and Slack and is built on Zoom's audio/video infrastructure.

1 investor

Renatus.ai offers a local-first AI agent orchestration platform that lets users deploy and manage autonomous AI agents from their own devices, with agents able to connect to crypto wallets, launch their own tokens, and manage their own wallets. The product is presented as private and self-hosted, running directly on the user's PC.

1 investor

Rencom develops custom AI models trained on a company's proprietary data and deploys in-house AI agents for enterprise clients. It focuses on building tailored frontier models and autonomous agents for organizations.

1 investor

Renderlet provides a procedural 3D modeling platform that enables developers and artists to create complex 3D designs, shapes, and animated effects by combining functions and primitives. The toolset supports real-time generation for game engines, applications, and other digital projects, with AI that maintains the semantic structure of procedurally generated content.

1 investor

The page is an Indonesian online gambling/sports-betting portal presenting itself as an alternative login link and agent for SBOBET football betting.

1 investor