Developer Tools Startups

SpAItial develops physically-grounded world models, a form of generative AI that creates and reasons about the appearance and physics of real and imagined 3D environments. Its models are aimed at applications spanning gaming and entertainment, CAD engineering and construction, VR/AR, and robotics.

1 investor

Sparkl provides infrastructure built around per-app "daemons" that expose application logic to both human users (via HTTPS browser apps) and AI clients (via MCP/OAuth) under a shared permission-grant system. Each daemon includes built-in AI capabilities such as structured JSON memory, a per-path file drive, semantic search indexes, and tool-using generative agents.

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

Spawn is a browser- and desktop-based platform for making multiplayer games through conversation, where users describe what they want to an AI game designer named Savi who builds terrain, characters, art, music, and rules in a shared world. Games run multiplayer at scale with no server management, can be published and monetized in-platform, and support places, portals, mods, and outside coding agents.

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

SPEEQO is a scoped consultancy that combines qualitative evidence review, product judgment, and engineering assistance to help teams investigate a specific decision and carry it through to a reviewed code change and outcome evaluation. It works alongside Tonelingo, a local research and delivery workspace that links source versions, research methods, decisions, task revisions, approvals, and implementation records.

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

Spyderbat provides threat detection, investigation, and response for cloud, Kubernetes, and Linux environments, using eBPF to record system behavior for continuous visibility, automated investigation, and real-time protection. The company targets security teams and was acquired by AGT Networks in 2025.

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

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

Sqwish Labs builds small, specialized machine learning models for real-time decisions within AI products, and continues improving them using customers' production data.

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

Orca is an agent development environment (ADE) that runs multiple AI code agents (Claude Code, Codex, OpenCode, Grok) side by side in isolated worktrees with built-in terminals, file editor, and git tracking for software developers. It includes a mobile companion app for iOS and Android to manage agent work remotely.

1 investor

Stackbit provides a platform for building AI-powered application features, letting product teams prototype with agents while engineers deploy to production on the same system. It offers tools for connecting apps to major AI models and deploying backend logic as API endpoints.

1 investor

Stack Machine provides instant sandboxed server environments and developer tooling that give organizations a full-stack view of their codebases and development environments. It is a developer tools company serving software engineering teams.

1 investor