Developer Tools Startups

Spark Automation provides 5-axis CNC milling, precision fabrication, automation integration, and test development services across multiple industries including automotive. The company offers design engineering, custom tooling, and comprehensive testing solutions for complex mechanical and electrical products.

1 investor

Sparkle AI, based in the United States, builds tooling for product security and compliance work. The software is aimed at teams responsible for meeting security requirements and audit obligations.

1 investor

Speakeasy builds developer tooling for API developer experience and has expanded into an enterprise control plane for AI, offering capabilities such as agent authorization, spending limits, and skills management. It serves enterprises and startups looking to scale AI integrations securely.

1 investor

Specific AI is a platform that automates the creation of task-specific small language models (SLMs) through an end-to-end distillation process. It enables enterprises to create and deploy specialized models in days rather than weeks by automating data collection, scoring, model selection, fine-tuning, and evaluation.

1 investor

SpecStory promotes an approach to software development where AI handles implementation while humans define intent, and specifications serve as a shared source of truth capturing the reasoning behind what is built. The page describes a philosophy around AI-assisted development and knowledge sharing rather than detailing a specific product.

1 investor

Spectral is the creator of SCALE, a compiler toolkit that recompiles CUDA code to run on a broad range of GPUs, including AMD and NVIDIA accelerators, without requiring code rewrites. Built on LLVM and Clang, it targets GPU developers who want vendor optionality and improved performance from a single CUDA codebase.

1 investor

Spectral develops SCALE, a compiler toolkit that recompiles CUDA code to run on a range of GPUs from different vendors, including AMD and NVIDIA, without rewriting the codebase. It targets developers building GPU-accelerated applications who want vendor flexibility and higher performance.

1 investor

Spectrexr develops a hand interaction toolkit for spatial computing that enables creators and developers to build lifelike, physics-driven interactions in augmented, virtual, and mixed reality environments. The toolkit works with Unity and Unreal Engine and requires no coding.

1 investor

Speek offers a conference calling service for web and mobile users that replaces dial-in numbers with a personal link for each host. Participants join through the link and see a visual interface showing who is on the call.

1 investor

Speko provides a unified API gateway for voice AI that benchmarks and routes speech-to-text, language models, and text-to-speech providers to the optimal stack for each call across 10+ languages. Developers can describe voice agents in plain English, test them in a browser, and deploy to phone numbers, web widgets, or APIs without managing multiple provider credentials.

1 investor

Spice Labs provides software scanning and cryptographic analysis tools that generate artifact dependency graphs of software systems and assist organizations in managing their transition to post-quantum cryptography. The platform serves development teams and enterprises seeking to understand software dependencies and remediate security vulnerabilities.

1 investor

Defakto provides an identity security platform for non-human actors such as workloads, CI/CD jobs, APIs, machines, and AI agents, issuing short-lived, verifiable identities instead of secrets, API keys, or standing access. Built on SPIFFE and other open standards, it targets enterprise security teams and integrates across cloud, on-premises, and hybrid infrastructure.

1 investor

Sprag provides AI systems for production environments where latency and reliability are critical requirements. The company focuses on serving teams building and deploying machine learning applications.

1 investor

A platform that enables research teams to continuously measure user experience across critical journeys by connecting signals to behavior and identifying what drives change over time.

1 investor

Spring provides open-source Java frameworks and tools for building applications and microservices, including support for web apps, cloud deployment, event-driven and batch processing, and integrating generative AI. It targets developers building production-grade, cloud-portable services in the enterprise Java ecosystem.

1 investor

Springtail built a way to scale Postgres read performance without data migrations, code changes, or new systems to manage, aimed at developers managing data infrastructure. The product is being discontinued and the team is joining Shopify, with plans to open source the project.

1 investor

SQD provides data infrastructure that extracts and decodes blockchain events, transactions, and traces across 130+ networks, streaming the results into users' own data warehouses for SQL-based analytics. The platform serves blockchain analytics teams and developers who need to build dashboards and insights on on-chain data without managing per-chain RPC infrastructure.

1 investor

SqlDBM is a cloud-based data modeling platform that helps teams design, collaborate on, and govern database schemas and semantic layers. It integrates with modern data stacks to provide visual data modeling, lineage tracking, and AI-ready governance across enterprise data architectures.

1 investor

SQLite Cloud provides a backend infrastructure for building offline-first applications across mobile, desktop, browser, and POS systems, with local SQLite writes that sync to cloud databases when connectivity is available.

1 investor

Mouseketrips is a travel agency that specializes exclusively in Disney vacations, including Walt Disney World, Disney Cruise Line, Disneyland, Aulani, and Adventures by Disney. Operating since 2002 as a Disney Authorized Travel Agency, it offers free planning and quotes to families and includes automatic price monitoring and rebooking.

1 investor

Squire is a developer tool that generates pull request descriptions, conducts code reviews, and writes code to address feedback from reviews.

1 investor

SRE.ai helps enterprise engineering teams coordinate work across distributed locations and time zones by organizing and routing DevOps tasks, flagged issues, and deployment requests while automatically identifying compliance and policy violations.

1 investor

SRT Labs integrates robotics and smart technologies to create software solutions that connect disparate systems across warehouses, classrooms, and other environments. The company serves organizations seeking to optimize operations through interoperable technology platforms.

1 investor

StableStack is a static analysis tool designed to catch structural issues and security vulnerabilities in AI-generated code across Python, JavaScript, TypeScript, and C#. It runs locally on developers' machines to detect patterns and bugs that AI assistants commonly introduce without requiring cloud processing or telemetry.

1 investor