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What's New in SPECLAN

Product announcements, feature releases, and community highlights.

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Release Notes

SPECLAN v0.9.11 — Mermaid Diagrams, Right in Your Specs

v0.9.11 adds Mermaid diagrams to your specs. Write a diagram in a plain mermaid code block and it renders inline in the editor — flowcharts, sequence diagrams, ER diagrams, everything Mermaid does — and because it's just text, it versions in Git with the rest of your spec. Edit the source in a dialog with a live preview, click a diagram node to open the spec it links to, and hover any link to see where it points. Plus: broken-link detection with a one-click Quick-Fix, cut/copy/paste for diagrams, and a new Failed task state.

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Release Notes

SPECLAN v0.9.10 — Resize, Recolor, and Relink Right in the Document

v0.9.10 is a hands-on pass over the editor. Drag a handle to resize an inline image where you see it — aspect locked, undo-able, SVGs included. Give an Excalidraw diagram a dark version and flip between light and dark with one toggle, even on a locked spec. Edit a markdown link's text inline without breaking the link, and click a link to open its target. Plus: the ChatGPT (Codex) model list is now live (default gpt-5.4), and two settings bugs are fixed — the model dropdown no longer shows another provider's models, and the first AI request after signing in with ChatGPT no longer fails on a retired model.

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Release Notes

SPECLAN v0.9.9 — Draw the Diagram Right Inside the Spec

v0.9.9 lets you draw diagrams where they belong: inside the requirement they explain. Sketch an architecture, a flow, or a state machine with Excalidraw without leaving SPECLAN; it renders inline, edits in place, and is stored as an ordinary .excalidraw.png in your own Git repo — human-readable for your team, machine-readable for your AI agent. Viewing works out of the box; drawing needs the free Excalidraw extension by pomdtr installed alongside SPECLAN. Also in v0.9.9: the HLRD Import Assistant now lets you choose an umbrella feature or populate in place and keeps your source document as an artifact, and AI Chat gains @-mention entity links and text-selection focus.

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Community

Which LLM Writes the Best Specifications? A Side-by-Side Across 13 Models

v0.9.6 let you point SPECLAN at any LLM you trust. The natural next question — which one should you actually use? — has no benchmark yet, because the literature stops at code. So we ran the same brief through 13 models on the same codebase (excalidraw), built a side-by-side viewer at speclan.net/compare, and let Claude Opus judge every other tree. The result is a 7-minute video and a gallery you can walk yourself: Anthropic's three sit at the top with Haiku 4.5 quietly out-counting Opus on requirements; Qwen 3.6 35B closes the cloud gap on a laptop; GPT-OSS 20B produces a coherent feature tree with zero goals; Gemma 4 26B leaves the literal string "Goal description goes here." in a Goal body; and Gemini Pro invents an account-billing system for a drawing tool. None of them are wrong — they're answering the same question with different products.

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Release Notes

SPECLAN v0.9.8 — From an Idea to a Spec You'd Actually Implement

v0.9.8 turns SPECLAN from a place you store specifications into a place you write them. A new AI Assistant takes a one-line idea and forges a context-aware first draft for a Feature, Requirement, or Change Request — then two refinement tools sharpen it. Clarify finds the ambiguities and gaps in your draft and asks you targeted questions; your answers are worked back in. Brainstorm surfaces the angles you didn't think of and lets you pick which ones make it into the spec. The AI suggests; you decide what stays. Also in v0.9.8: a permanently visible Search Bar in the WYSIWYG editor for finding text fast within the open specification.

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Release Notes

SPECLAN v0.9.7 — Specs Grow Attachments. Projects Grow a Reference Shelf.

v0.9.7 ships two artifact mechanisms — deliberately different — plus a one-click implementation-prompt button. Spec Artifacts attach evidence to a single feature, requirement, or change request with Change Request governance on locked specs. Project Artifacts give the whole project a shared reference shelf with no governance at all. Plus Quick Impl., the pill button that turns an approved spec into a paste-ready implementation prompt with a single click.

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Release Notes

SPECLAN v0.9.6 — Use SPECLAN With Your ChatGPT Account

If you already pay for ChatGPT Plus, Pro, or Team, you can now use SPECLAN — no separate API key, no additional subscription on top. v0.9.6's headline is Codex OAuth: sign in with ChatGPT and your existing Codex budget powers every AI workflow in the extension. Also shipping: first-class Local LLM support via Ollama and LM Studio, and reliability improvements for weaker models.

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Release Notes

SPECLAN v0.9.5 — A More Streamlined Experience

SPECLAN v0.9.5 focuses on UI/UX polish: a consistent webview design system, a redesigned welcome screen, two assistants out of the experimental toggle, and bug reports that now go straight to the r/speclan subreddit.

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Release Notes

SPECLAN Plugin v0.15.20 — BMAD-METHOD Support

The SPECLAN Claude Code Plugin now converts between BMAD-METHOD and SPECLAN in both directions. Import BMAD PRDs, epics, and architecture docs into SPECLAN's lifecycle — or export your approved specs as BMAD-standard PRDs.

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Release Notes

SPECLAN v0.9 — First Public Release

SPECLAN ships its first public release. A VS Code extension that turns your specifications into AI-ready prompts — with built-in AI support for Claude, Google Gemini, and OpenAI.

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