Dev tool name
Titanoboa
Dev tool description
Vyper's native testing tool: a Vyper interpreter (compiles via the Vyper compiler, executes on py-evm) offering mainnet forking, debugging, and pretty tracebacks. The Vyper docs use it as the standard way to test Vyper contracts.
When did the dev tool go live?
First release April 2023 (repo created 2022). Actively maintained, latest release Oct 2025
Where do you think this page should be shown?
developers/docs/programming-languages/python in the "Active" tooling list. It's Python-based Vyper tooling and the page is flagged incomplete.
Is the product open source?
Yes
GitHub URL
https://github.com/vyperlang/titanoboa
Documentation URL
https://titanoboa.readthedocs.io/en/latest/
Additional context
The page is also missing Moccasin (https://github.com/Cyfrin/moccasin), a Vyper/Python development & testing framework built on Titanoboa that the Vyper docs mention. I'd add both in the same PR.
Disclosure: I'm a Vyper contributor.
Would you like to work on this issue?
Dev tool name
Titanoboa
Dev tool description
Vyper's native testing tool: a Vyper interpreter (compiles via the Vyper compiler, executes on py-evm) offering mainnet forking, debugging, and pretty tracebacks. The Vyper docs use it as the standard way to test Vyper contracts.
When did the dev tool go live?
First release April 2023 (repo created 2022). Actively maintained, latest release Oct 2025
Where do you think this page should be shown?
developers/docs/programming-languages/python in the "Active" tooling list. It's Python-based Vyper tooling and the page is flagged incomplete.
Is the product open source?
Yes
GitHub URL
https://github.com/vyperlang/titanoboa
Documentation URL
https://titanoboa.readthedocs.io/en/latest/
Additional context
The page is also missing Moccasin (https://github.com/Cyfrin/moccasin), a Vyper/Python development & testing framework built on Titanoboa that the Vyper docs mention. I'd add both in the same PR.
Disclosure: I'm a Vyper contributor.
Would you like to work on this issue?