Developer Tools Startups

TestBox is a buying and selling operating system designed to optimize the software purchasing experience for customers. The platform helps buyers make confident purchasing decisions and enables sellers to close larger deals through improved customer experience design.

3 investors

TesterArmy provides AI-powered automated testing for web and mobile applications, performing browser checks and generating bug reports with screenshots and recordings. It serves development teams and QA professionals who need to validate product functionality across apps and websites.

3 investors

TestParty builds software that automates digital accessibility compliance end-to-end, giving businesses and their employees tools to test products and meet ADA accessibility standards. The product targets engineering and product teams responsible for making websites and software accessible.

3 investors

TestSprite automates software testing for back-end and front-end systems using AI, allowing individual developers and DevOps teams to validate code with minimal manual input. The platform reduces the need for manual test plan creation and catches corner cases, compliance issues, and security problems.

3 investors

thatDot's Novelty Detector is an unsupervised machine learning engine that identifies novel anomalies and threats in real-time data streams, including categorical and non-numeric data, without requiring manual training or labeled data. It serves security teams, network operations, and fraud detection teams who need to detect unknown threats and reduce false positives in high-volume data environments.

3 investors

Dia is a browser designed for work productivity that integrates with tools like Slack, Notion, Google Workspace, and GitHub to provide unified context, automated meeting preparation, and contextual search capabilities. It serves knowledge workers and teams seeking to streamline workflows across fragmented work applications.

3 investors

The Wild is a collaborative workspace platform that enables enterprise and innovation teams to plan, prototype, and iterate on spatial concepts in real time using desktop, VR, and AR interfaces. The platform supports up to eight simultaneous participants and integrates with SketchUp for rapid design workflows.

3 investors

Themis AI develops uncertainty estimation technology for machine learning models, offering a software framework that measures model reliability and output quality. Spun out of MIT's Computer Science and Artificial Intelligence Laboratory, it serves organizations deploying AI who need quality assurance for model predictions.

3 investors

Theodo is a technology consultancy that designs, builds, and operates digital products and systems for organizations, using its Lean Tech methodology to deliver software quickly and at scale. Its work includes building mobile platforms, streaming services, and financial platforms for clients such as Compagnie des Alpes, TF1, and Bpifrance.

3 investors

Theorem Labs develops formal verification technology for software, producing mathematical proofs that cover a program's full behavior space, beginning with verified sandboxes designed to contain AI agents. The company targets security use cases where verification remains reliable as adversaries become more capable.

3 investors

ThinkChain.ai builds AI tools including AI agents that conduct qualitative interviews and surveys at scale for market researchers and academic professionals, and cloud-hosted MCP server bundles that connect AI assistants like ChatGPT and Claude to external tools. Its offerings target researchers, students, professionals, and developers seeking AI automation without technical setup.

3 investors

Provides SonarQube-based code quality and security analysis across 35+ programming languages, covering first-party, AI-generated, and open source code including mobile applications. Includes software supply chain security features for managing open-source risks, detecting malicious dependencies, and generating SBOMs.

3 investors

Tiger Data, creators of TimescaleDB, builds a Postgres-based time-series database for fast ingest, efficient storage, and real-time analytics at scale. It targets industrial, energy, and robotics systems, offering tiered storage, columnar compression, and hybrid retrieval across cloud and Postgres ecosystems.

3 investors

Tilores provides entity resolution infrastructure for developers that ingests customer data from any source, resolves duplicates in real time, and serves unified entity profiles via GraphQL. It can run fully managed on AWS or deployed on-premises, offering deterministic rules and fuzzy matching with a transparent audit trail.

3 investors

Tilt is an open-source developer toolkit for microservice development that provides smart rebuilds, live updates, and automated workflows across local and Kubernetes environments. It gives engineering teams a continuous feedback loop with logs, build status, and runtime errors, along with shared dev environments and reproducible setups.

3 investors

TopK is a search platform that vertically integrates retrieval, inference, and document processing to run search over structured and unstructured data, built on object storage for lower cost and scale. It supports hybrid search, multi-vector retrieval, custom scoring, and File Search for grounding AI agents in private documents, with SDKs for Python, JavaScript, Rust, and a SQL/Postgres wire protocol interface.

3 investors

Trace provides an AI orchestration platform that models task flows between departments and aligns AI agents with human judgment to automate operational workflows at scale. The product is designed for enterprise teams seeking to automate complex multi-department processes while maintaining visibility and control.

3 investors

Trace Machina builds NativeLink, an open source simulation infrastructure platform that uses remote build execution, caching, and cloud support to improve engineering productivity and reduce compute costs. It serves individual developers and large companies working with large objects and complex systems across native and interpreted programming languages.

3 investors

Traceable offers a context-aware application and API security platform that automatically discovers and inventories internal, public, shadow, and third-party APIs across on-prem and cloud environments. It provides security posture management, threat detection and blocking, and API security testing for SOC teams, incident responders, and security teams across the software development lifecycle.

3 investors

Tracel develops compiler tools and collaborative platforms to make AI model development more efficient and portable across different hardware platforms, addressing fragmentation in the AI ecosystem.

3 investors

TraceRoot.AI provides an open-source observability and automatic remediation platform for AI agents, enabling developers to capture execution traces and diagnose issues with AI-assisted debugging that incorporates source code and version control context.

3 investors

Trampoline.ai promotes an approach to restructuring companies around AI, describing a "two-speed intelligence" model where fast AI handles processing and extraction while human/slow intelligence handles decisions and judgment. The page is largely a manifesto and does not clearly describe a specific product or service.

3 investors

Transifex offers a translation management platform with AI-powered workflows for localizing software, websites, mobile apps, knowledge bases, and games. It serves localization managers and development teams with tools for automated task distribution, quality checks (Transifex Quality Index), glossaries, translation memory, and CI/CD integration.

3 investors

Triangle provides a wallet infrastructure API that enables developers to embed Web3 experiences including DeFi, NFTs, and payments into applications. The platform offers multi-chain support and custodial infrastructure for businesses building on blockchain networks.

3 investors