TL;DR
Thorsten Meyer AI has detailed Threlmark, an MIT-licensed roadmap tool built around a plain JSON file on disk. The dispatch says the board is a view over that file, allowing tools and agents to read and write the same roadmap without a SaaS API.
Thorsten Meyer AI has published a Built in Public Day 7 dispatch outlining Threlmark, an MIT-licensed, local-first roadmap tool that keeps its plan as a plain JSON file on the user’s disk; the update matters because it positions the product as an anti-lock-in alternative to roadmap systems tied to hosted databases and vendor APIs.
The source material says Threlmark’s central design rule is disk is the contract. In practice, that means the roadmap lives in a local JSON file, while the kanban board is a view over the same file. The dispatch says other tools and automated agents can read from and write to that file directly.
The product is described as a scored kanban system, with each item carrying a priority score. According to Thorsten Meyer AI, that scoring is meant to turn a roadmap from a flat list of requests into an ordered plan where trade-offs are visible.
The post states that Threlmark is open source under the MIT license and available through threlmark.com. It also says the project is provided as is, without warranty, and that automated agent edits should be reviewed rather than treated as reliable facts.
Threlmark — disk is the contract
The roadmap is a plain JSON file on your disk. The board is just a view over it — and your tools and your agents read and write the same file directly.
Independent commentary, produced with AI assistance under human editorial oversight. The views are the author’s own and may change. Threlmark is open source under MIT, provided “as is” without warranty; see the repository LICENSE. Automated agents that read and write the roadmap file may introduce errors — treat agent writes as changes to review, not facts to trust. Product and company names are trademarks of their respective owners; mention does not imply endorsement.
Roadmaps Outside SaaS Lock-In
For readers who manage product plans, the main effect is ownership of operational data. A roadmap stored as JSON can be inspected, backed up, versioned, or edited outside the application that displays it. That reduces reliance on a single vendor’s pricing, API rules, export format, or long-term availability.
The agent workflow is also part of the pitch. If humans and agents work against the same file, automation can update the roadmap without a hosted API. The source frames that as provider-agnostic, but it also warns that agent writes can introduce errors and need review.
local JSON roadmap management tool
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Day 7 Product Thread
Threlmark appears in Thorsten Meyer AI’s Built in Public series as Day 7 of 19. The source places it within a broader operator portfolio and describes it as part of a decision layer where ideas move from evaluation into ordered execution.
The dispatch connects Threlmark to IdeaClyst, another product in the portfolio. In the described flow, IdeaClyst produces verdicts on ideas, and Threlmark turns those verdicts into scored roadmap items. The claim is that ranking forces choices instead of letting every task sit at the same priority level.
“The roadmap is a plain JSON file sitting on your own disk.”
— Thorsten Meyer AI
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Open Questions Around File Governance
The provided source material does not state a public version number, supported operating systems, release stage, or whether packaged builds are available. It also does not describe file locking, merge conflict handling, schema migration, validation rules, or multi-user sync for teams editing the same roadmap.
It is also not clear how Threlmark will handle malformed JSON, competing agent edits, or permission controls around automated writes. Those details will matter for teams that want to use the file as a shared planning record.
priority scoring project management app
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Schema Details And Releases Ahead
The next useful markers are public repository documentation, example roadmap files, release notes, and clearer guidance on the JSON schema. Those materials would show how stable the contract is and how easily outside tools can build against it.
Readers following the Built in Public sequence should expect additional product dispatches after Day 7. Teams testing Threlmark should review agent edits through version control and treat the local JSON file as the source of record only after checking changes.
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Key Questions
What is Threlmark?
Threlmark is described by Thorsten Meyer AI as an MIT-licensed, local-first roadmap and scored kanban tool. Its roadmap data is stored as a plain JSON file on the user’s disk.
What does disk is the contract mean?
It means the integration point is the file format, not a hosted service. Any tool that can read or write the agreed JSON shape can work with the roadmap.
Is Threlmark open source?
The source material says Threlmark is open source under the MIT license and is provided as is, without warranty.
Can agents edit the roadmap?
According to the dispatch, agents can read and write the roadmap file directly. The same source warns that agent edits may contain errors and should be reviewed.
What is not known yet?
The provided material does not confirm release version, platform support, packaging, file conflict handling, schema stability, or team sync behavior.
Source: Thorsten Meyer AI
