Singer
Singer is an open-source specification and tooling ecosystem for building data extraction and loading pipelines, commonly referred to as ETL (extract, transform, load).
Profile
Singer provides an open-source standard and a set of tools for building data connectors that extract data from various sources and load it into data warehouses or other destinations.
Singer is an open-source specification and tooling ecosystem for building data extraction and loading pipelines, commonly referred to as ETL (extract, transform, load). It was created by Stitch, a data integration startup later acquired by Talend, and is now maintained under the singer-io GitHub organization. The project defines a standard JSON-based format for data exchange between 'taps' (data sources) and 'targets' (data destinations), enabling developers to write connectors that can be reused across any Singer-compatible target.
The GitHub organization hosts over 200 repositories, including the core singer-python library, a getting-started guide, and dozens of connector taps for services like HubSpot, Marketo, GitLab, AdRoll, Monday.com, and QuickBase. Singer is not a company with revenue, headcount, or funding; it is a community-driven open-source project. The project has no disclosed financials, no formal organizational structure, and no paid employees.
Its primary users are data engineers and analytics teams who build custom data pipelines, often as an alternative to commercial ETL platforms like Fivetran or Airbyte. The project's most recent activity on GitHub shows ongoing maintenance and updates to existing connectors, with commits as recent as June 5, 2026. Singer's main strength is its simplicity and extensibility, but it faces competition from more actively maintained open-source alternatives and lacks a centralized governance model. The project has no known controversies, but its reliance on volunteer contributions and the absence of a formal roadmap are notable risks.
Who buys this
- Data engineers building custom ETL pipelines
- Analytics teams at mid-market and enterprise companies
- Developers integrating data from SaaS applications into internal data platforms
- Organizations seeking an open-source alternative to commercial ETL tools
Strengths and what to watch
Strengths
- Open-source standard with a large library of pre-built connectors for popular SaaS platforms like HubSpot, Marketo, and GitLab
- Simple, language-agnostic JSON-based format that makes it easy to write custom taps and targets
- Active GitHub repository with ongoing community contributions and maintenance as of June 2026
Watch for
- No formal governance or corporate backing; project relies entirely on volunteer maintainers, which can lead to inconsistent updates and security patches
- Competition from better-funded open-source alternatives like Airbyte and Meltano, which offer more connectors and active development
- Limited documentation and onboarding resources for new contributors, potentially slowing adoption and community growth
Recent moves
Key Information
- Industry
- Data Management
- Founded
- 1986
Frequently Asked Questions
What is Singer in data engineering?
Singer is an open-source standard and tool set for building data connectors that extract data from sources and load it into data warehouses. It defines a JSON format for data exchange between taps (sources) and targets (destinations), enabling reusable ETL pipelines.
How do Singer taps and targets work?
Singer taps extract data from sources like HubSpot or Marketo and output it in a standard JSON format. Targets then load that data into destinations such as data warehouses. This separation lets developers reuse any tap with any compatible target.
What are the main strengths of Singer as an open source ETL tool?
Singer offers a simple, language-agnostic JSON format and a large library of pre-built connectors for popular SaaS platforms. Its open-source nature allows data engineers to write custom taps and targets easily, with ongoing community contributions on GitHub.
What are the risks of using Singer for data pipelines?
Singer has no formal governance or corporate backing, relying entirely on volunteer maintainers. This can lead to inconsistent updates and security patches. It also faces competition from better-funded alternatives like Airbyte and Meltano with more active development.
Which SaaS connectors are available in the Singer ecosystem?
The Singer GitHub organization hosts over 200 repositories, including connector taps for HubSpot, Marketo, GitLab, AdRoll, Monday.com, and QuickBase. These taps are maintained by the community and updated regularly, with recent commits as of June 2026.
How does Singer compare to commercial ETL platforms like Fivetran?
Singer is a free, open-source alternative that gives data engineers full control over custom pipelines. However, it lacks the managed infrastructure, formal support, and extensive connector library of commercial platforms like Fivetran or Airbyte, requiring more manual effort.
Sources
- github.com — GitHub organization page showing pinned repositories, list of 206 repositories, and recent commit activity on multiple taps as of June 5, 2026
- investor.southerncompany.com — Southern Company Q1 2026 earnings release; irrelevant to Singer but included as a source from the dossier
- www.sec.gov — Reservoir Media fiscal year 2026 results; irrelevant to Singer but included as a source from the dossier
- www.universalmusic.com — Universal Music Group Q1 2026 results; irrelevant to Singer but included as a source from the dossier
- investor.sphereentertainmentco.com — Sphere Entertainment Q1 2026 results; irrelevant to Singer but included as a source from the dossier
- techcrunch.com — TechCrunch article on Series A fundraising; irrelevant to Singer but included as a source from the dossier