Developer Tools Startups

Stepsize uses generative AI to analyze issue tracker activity and automatically generate weekly management reports for engineering teams and leaders. The platform delivers AI-generated insights, risk detection, and progress metrics for product development projects.

2 investors

StitchFlow provides visibility and automation tools for cloud-native IT teams managing complex business and application sprawl in modern organizations.

2 investors

Storemaven.com is a review and comparison site focused on crypto and Bitcoin casinos, testing platforms for licensing, payout speed, bonus terms, and provably fair technology. It provides independent, data-backed recommendations for players seeking safe and transparent crypto gaming sites.

2 investors

Storyline offered a no-code builder for creating Amazon Alexa voice skills, allowing users to build voice applications without programming.

2 investors

Strigo provides a managed cloud lab infrastructure platform for delivering technical training. The solution enables organizations to create, configure, and deploy interactive hands-on learning environments across AWS, Azure, and GCP.

2 investors

Sublayer is an AI-native software studio and lab that builds products, open source projects, and community around AI, including "Where Is Everyone," an attendance-prediction tool for community organizers. Its work explores software creation as the cost of making things approaches zero.

2 investors

SubQ is a sub-quadratic LLM infrastructure company that provides a 12M token context window API for developers and enterprise teams. The platform enables reasoning across full code repositories and long-running agent state through a sparse-attention architecture that reduces attention compute while maintaining reasoning quality.

2 investors

Sun Asterisk is a digital technology and creative services company that builds products and develops talent across Japan and ASEAN countries. The company operates a software development arm, a startup accelerator/incubator, and an IT training program educating approximately 2,000 students annually to address digitalization across industries.

2 investors

supa, inc. builds a suite of developer and business software products for the Japanese market, including a CMS, .jp domain registration, eKYC identity verification, email and SMS systems, cloud servers, payments, and AI-based QA and bug-fixing tools. The company is focused on reducing Japan's "digital deficit."

2 investors

Superblocks is a governed app-building platform that lets business teams create production-grade internal applications while IT and security teams control integrations, permissions, auditing, and data access. It runs inside a company's own AWS private cloud, acts as an integration control layer for AI apps, and can import prototypes from tools like Claude, Replit, and Lovable.

2 investors

Superflows provides an AI-powered assistant interface that software products can embed to help users access features and solve problems intuitively. The company builds open-source tooling leveraging large language models to make it easy for software vendors to add conversational product assistants to their applications.

2 investors

Supergood generates real backend APIs for enterprise platforms that lack them by reverse-engineering the underlying network calls behind logins, handling MFA and CAPTCHAs via service accounts. It deploys and maintains these APIs on its own observability platform, offering an MCP server and REST API as an alternative to browser automation.

2 investors

Superlogical is building a multiplexer for software work that unifies interactive, automated, and production workflows in a durable, shareable session; its first product is a modern terminal multiplexer with long-lived sessions accessible via web and native macOS/iOS apps. It targets developers and their tooling and infrastructure workflows.

2 investors

Superluminal develops a performance profiler for software and game developers, built to quickly identify and fix performance issues in real-time software. The tool targets game studios, from independents to AAA developers, and emphasizes speed, stability, and a simple interface.

2 investors

Superserve provides durable Firecracker-based virtual machines and sandboxes for AI agents, allowing long-running agent workloads to pause indefinitely, snapshot, and resume with persistent state. It targets developers building AI agents, offering isolated microVMs with security features like a credentials broker and network egress controls.

2 investors

Supersimple provides enterprise search functionality that indexes and searches data across multiple connected tools like Slack, Google Drive, Notion, and Confluence, with real-time indexing and permission-aware results that respect each user's access level in the original services.

2 investors

Superthread is a unified workspace combining task management, project documentation, and AI-powered meeting transcription for engineering and product teams. The platform replaces fragmented tool workflows with a single app featuring sprints, kanban boards, and integrations with GitHub, Slack, and Google Calendar.

2 investors

SuprSend provides a notification infrastructure that lets product and engineering teams model recipients — including users, non-user objects, B2B tenants, and segments — to handle recipient resolution, multi-channel delivery, and per-customer customization. It supports multi-level preferences, vendor routing, and end-to-end delivery observability across email, push, Slack, in-app, and SMS.

2 investors

Swarm is an open-source, decentralised peer-to-peer storage and communication network that lets developers build serverless, permissionless web3 applications, run Bee nodes, and store data in a fault-tolerant, censorship-resistant way. It also provides the Fair Data Protocol for data interoperability and privacy, serving web3 developers, creators, and non-profits.

2 investors

Switstack builds software-defined EMV payment infrastructure that lets payment and hardware teams develop, test, and deploy card-payment software independently of specific hardware. Its cloud-native, source-available tools target developers building SoftPOS, PCI-PTS terminals, and EMV L2 integrations.

2 investors

Syllotips provides a continuous improvement platform for enterprise AI agents that captures expert knowledge and uses human-in-the-loop validation to improve agent accuracy, reduce token waste, and scale expert answers across similar workflows. The platform serves enterprise teams deploying AI agents in customer experience, sales enablement, and field service use cases.

2 investors

Symbiotic Flow is a security tool designed to fit into developers' workflows without slowing them down, aiming to reduce the friction that causes security steps to be skipped and risk to accumulate in code. It targets software development teams in the application security space.

2 investors

Synaptic helps enterprise leaders and government agencies adopt and scale artificial intelligence in their business processes through consulting, industry-specific agents, and delivery tools. The company focuses on identifying high-value AI opportunities and executing AI transformation projects built on Salesforce's secure platform.

2 investors

Synervoz develops voice AI and audio software solutions for enterprises across multiple industries including gaming, automotive, communications, and finance. The company provides SDKs, staff augmentation, and consulting services alongside custom audio hardware solutions.

2 investors