Tidelift
The business, the turning points, and the decisions behind them.
Some sections are still being researched2 / 4
Sections to complete：02 · 05
01 / WHAT IT BUILT
What the company did
Tidelift was a Boston-based developer platform company that made open source software work better for enterprises. It sold a managed open source subscription covering application dependencies across JavaScript, Python, Java, PHP, Ruby, .NET and more, and uniquely paid the maintainers of the open source packages its customers relied on in exchange for maintenance, security and lifecycle assurances. The company raised $73.5 million across four rounds, including a $15 million Series A in 2018, and was acquired by Sonar in 2025.
02 / FAILURE REASONS
Material for this section is being gathered and checked. It will appear here once ready.
03 / EVENT HISTORY
Events in the structured record
- Funding round
Tidelift closes a $15 million Series A round co-led by General Catalyst and Foundry Group.
- Peak funding round
Tidelift closes its Series C round in September 2022, its last tracked financing.
- Acquisition
Tidelift is acquired by Sonar; the platform and developer surface remain active under the new owner.
04 / CONTEMPORARY REBUILD ASSESSMENT
Difficulty of rebuilding this project today
Material for this section is being gathered and checked. It will appear here once ready.
Overall assessment: Not completed
05 / CAUSAL CHAIN / AFTERMATH
Material for this section is being gathered and checked. It will appear here once ready.