TL;DR
Thorsten Meyer AI has presented Threlmark as an open-source roadmap tool whose core contract is a plain JSON file stored on the user’s disk. The project frames that design as a local-first alternative to SaaS roadmap tools that keep plans inside vendor databases and APIs.
Thorsten Meyer AI has introduced Threlmark, an open-source roadmap tool that stores the plan as a plain JSON file on the user’s disk, a design the project says is meant to reduce dependence on vendor databases, SaaS APIs and proprietary roadmap formats.
The Day 7 Built in Public dispatch describes Threlmark’s central product decision as “disk is the contract.” According to the source material, the roadmap is not treated as data that lives behind a hosted service. It is a structured JSON file that the user owns locally, while the kanban board acts as a view over that file.
The project is described as open source under the MIT license and available at threlmark.com. The source says the same file can be read and written by the Threlmark interface, other tools and automated agents, provided they honor the JSON structure. The stated aim is to make the file format the integration point, rather than requiring an SDK, webhook, hosted API or vendor account.
Threlmark is also described as a scored kanban system. Items carry priority scores, allowing the board to rank work rather than present every task as equal. The dispatch says Threlmark is part of a larger “operator portfolio” and is linked to IdeaClyst, another project in the series, whose verdicts can become scored roadmap items.
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 Built Outside SaaS
The announcement matters for readers who rely on roadmap and project planning tools but want more control over operational data. Many commercial planning tools store roadmap data inside managed databases and expose it through product-specific interfaces. Threlmark’s file-based model is positioned as an alternative: the roadmap remains readable and portable even if the interface changes.
That approach may appeal to developers, small teams and AI-assisted operators who want agents or scripts to update planning data without negotiating a SaaS permission layer. The source argues that anything able to read and write JSON can become a client. That claim depends on the stability and clarity of Threlmark’s schema, which the source material does not fully detail.
The scoring feature also matters because it turns prioritization into part of the data model. Instead of relying only on manual ordering or labels such as “high priority,” Threlmark records a score on each item. The project frames that as a way to make trade-offs visible.
JSON file editor for project management
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Day Seven Product Link
Threlmark was presented as Day 7 of a 19-day Built in Public series from Thorsten Meyer AI. The source describes the broader effort as an 18-product “operator constellation,” with local-first and provider-agnostic design as recurring principles.
Within that lineup, Threlmark is positioned as the place where decisions become an ordered plan. The source describes a flow from IdeaClyst to Threlmark: council-style verdicts from IdeaClyst are converted into scored roadmap items. That framing makes Threlmark less a standalone kanban board in the series and more the planning layer for other tools.
The project disclosure says the commentary was produced with AI assistance under human editorial oversight, that views are the author’s own, and that Threlmark is provided “as is” without warranty under its repository license.
“disk is the contract”
— Thorsten Meyer AI dispatch
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Schema Details Still Limited
The source material does not provide the full JSON schema, release status, installation path, repository activity, supported platforms or whether Threlmark currently has production users. It is also not clear how the project handles concurrent edits, file conflicts, validation errors, backups or version control workflows.
The claim that there is “no API, no lock-in” is the project’s framing. The file-based model reduces one form of vendor dependence, but practical portability will depend on documentation, schema stability and whether other tools adopt or correctly implement the file contract.
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Watch The File Contract
The next milestone for readers is the release or review of Threlmark’s full implementation details, including the JSON schema, validation rules and repository documentation. Those details will show whether the project can support the interoperability and agent workflows described in the Built in Public dispatch.
Teams evaluating the project should treat current descriptions as an announcement of design intent and product direction, not proof of operational maturity. The source’s own disclosure says agent-written changes should be reviewed.
task planner prioritization matrix,priority task list
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Key Questions
What is Threlmark?
Threlmark is described by Thorsten Meyer AI as an open-source roadmap and scored kanban tool that stores its roadmap data in a plain JSON file on the user’s disk.
What does “disk is the contract” mean?
It means the roadmap file itself is the shared interface. The Threlmark UI, other tools and agents are meant to read from and write to the same structured JSON file.
Is Threlmark a SaaS product?
The source material frames Threlmark as a local-first tool rather than a SaaS roadmap database. It says there is no SaaS API required for tools or agents to work with the roadmap file.
Is Threlmark open source?
Yes, according to the provided source material, Threlmark is open source under the MIT license and provided without warranty.
What is still unknown about Threlmark?
The source does not fully show the schema, platform support, release maturity, conflict handling or real-world adoption. Those details will matter for teams deciding whether to use it.
Source: Thorsten Meyer AI
