Developer Tools Startups

Kyndryl Cloud Uplift (formerly Skytap) migrates IBM Power workloads (AIX, IBM i) and x86 systems to Microsoft Azure without rewriting or refactoring applications, supporting data center exit, disaster recovery, and incremental modernization. It serves enterprises running legacy mission-critical systems, offering consumption-based Azure billing, high availability, and virtual IT labs for training and proofs of concept.

4 investors

Sofy is a no-code test automation platform for mobile apps that runs end-to-end testing from the CI/CD pipeline on real physical devices without requiring code. It serves engineering and QA teams, covering test case planning, automation, environment setup, reporting, and debugging in a single tool.

4 investors

SolvaPay provides authentication, billing, and payment infrastructure for AI agents to purchase digital services, letting developers add subscriptions, usage-based billing, and one-time payments to MCP servers and APIs. It runs checkout, invoicing, and payouts through Stripe and offers OAuth-based user identity, tool-level pricing, and agent spending credits.

4 investors

Sparkles provides a platform for teams to run AI coding agents that connect to GitHub repositories and generate pull requests. The service integrates with 3,000+ tools including Slack, Linear, and Jira, allowing teams to automate code changes through multiple agent options in isolated cloud sandboxes.

4 investors

Spatial develops a platform for teams to design, share, and experience 3D environments in real time using spatial computing technology. The tool serves design studios and architectural teams seeking immersive collaboration experiences.

4 investors

Spicenet builds a brokerage network for decentralized finance, providing access to DeFi venues across multiple blockchain ecosystems. It serves builders and traders seeking liquidity and distribution solutions in the DeFi market.

4 investors

Split provides an SDK for evaluating feature flags (treatments) within software applications, used by developers to control feature rollouts in their code.

4 investors

Spur provides an AI-powered autonomous testing platform that automatically plans, executes, and reports software tests across web and mobile applications. The platform uses natural language instructions to enable non-technical team members to create and maintain test coverage for functional, UI/UX, localization, and exploratory testing scenarios.

4 investors

The page presents itself as a set of LLM-oriented documentation reminders rather than a standard marketing site. It describes a platform (formerly known as Stack Auth) offering developer apps for connecting with users, including authentication, fraud protection, teams, RBAC, API keys, payments, emails, webhooks, and analytics, delivered via SDKs for JavaScript/TypeScript, Next.js, React, and TanStack Start.

4 investors

Stack Internal is a knowledge management platform that captures, structures, and validates enterprise knowledge to provide trusted context for AI agents and human teams. It integrates with multiple tools to centralize scattered documentation and decisions while maintaining governance, security, and trust signals for access control.

4 investors

Stainless builds open-source standards and developer tools that combine GraphQL and gRPC capabilities with REST's simplicity, targeting API developers and platform builders. The company offers a suite of developer platform products designed to deliver high-quality API experiences.

4 investors

Starknet is an Ethereum Layer 2 Validity Rollup that uses STARK cryptography to validate off-chain transactions for greater scalability while retaining Ethereum's security. It offers native account abstraction, the Cairo smart contract language, and privacy features for developers building decentralized applications (DeFi, NFTs, gaming).

4 investors

Steep builds business analytics software that distributes data insights across organizations, addressing the challenge of making analytics accessible beyond specialized analysts.

4 investors

Stellon Labs develops compact AI models optimized for edge computing and resource-constrained hardware environments.

4 investors

Strapi is a headless content management system that enables content teams to create, update, and publish website and app content without developer assistance. The platform targets business teams and developers who need faster content delivery and customizable templates across websites, apps, and IoT projects.

4 investors

StratusGrid provides cloud technology consulting and solutions, working with startups, small and medium businesses, and large enterprises. The company focuses on cloud infrastructure, DevOps, and technology product delivery.

4 investors

Structify helps legacy businesses integrate AI into their operations by mapping data systems and business context, then delivering a concrete blueprint for AI-driven ROI within 30 days. The company serves established enterprises across industries seeking a pragmatic, results-oriented approach to AI implementation rather than consultant recommendations.

4 investors

Stytch provides an identity and authentication platform for applications and AI agents, offering authentication, authorization, security, and fraud protection features. The platform serves enterprise customers and developers building multi-tenant applications.

4 investors

Subconscious develops TIMRUN, an inference runtime, and the TIM family of post-trained open models optimized for AI agent workloads rather than chatbots, offering on-GPU context compression that extends context windows and increases concurrency and token throughput. It serves developers building coding agents, agentic products, and edge deployments via OpenAI- and Anthropic-compatible APIs, and can act as a drop-in replacement for vLLM and SGLang.

4 investors

Superglue provides AI agents that automate enterprise system integration, data migration, and implementation work across cloud or on-premises infrastructure. The platform connects disparate systems and performs data synchronization tasks that typically require manual engineering coordination.

4 investors

Superlog provides AI-driven observability that automatically identifies, investigates, and fixes issues in software by analyzing logs, traces, and deployment history to propose pull request solutions. The platform instruments code with OpenTelemetry, consolidates related errors into single incidents, and delivers actionable fixes directly to developers via Slack.

4 investors

SuperOps builds an AI-native platform that consolidates device management, service delivery, and client operations for IT teams and managed service providers (MSPs). The platform aims to reduce operational overhead and enable IT teams to focus on strategic initiatives rather than reactive firefighting.

4 investors

Superwall provides a no-code platform for mobile app developers to design, A/B test, and optimize in-app paywalls and subscription flows. The platform enables monetization experiments and revenue optimization for iOS, Android, and cross-platform apps.

4 investors

Sutro provides production-grade backend infrastructure and APIs for applications through a declarative language called SLang, enabling developers to define data models and deploy complete backend systems with minimal effort.

4 investors