Does it work offline?

Yes. Draw+ for Windows is local-first by design. The network is only used for sign-in and subscription checks — modeling, traceability and AI assistance all work offline. It even runs in air-gapped environments.

Where is my design data stored?

On your PC, as local XML text files. Nothing is stored in the cloud. Because it's text, you can version, diff and branch it directly with Git.

If I use the AI, is my design sent anywhere?

No. The AI Co-Pilot runs an on-device LLM (llama.cpp, with Llama-3.2-3B-Instruct bundled). Your diagrams and prompts are never sent to an external server.

Can I try it for free?

Yes. You can try every feature for free with no sign-in — draw, model, explore and ask the AI at no cost. There is no permanent free version: a $10/month subscription is required to save (persist) your models and nodes to local files.

Yes. Purchase and cancellation happen through Stripe's hosted Checkout and Customer Portal in your browser. You can cancel yourself anytime; the app never stores your payment details.

Draw+ is built specifically for individual developers. It does not provide team management, co-editing, organization accounts or RBAC. It's a simple, single account for one person working locally.

Is it available in Japanese?

Yes. The UI is bilingual English / Japanese — menus, context menus and dialogs all follow the language switch in Settings.

What diagrams can I draw?

SysML V2 (bdd / ibd / pkg / par / act / sd / stm / uc / req / test — 10 types) plus UML, BPMN, mind maps and basic shapes, all on the same canvas.

Won't a tool like this be heavy?

No. Draw+ is a Win32 + Direct2D native app — not Electron — so it's light and launches instantly. A C++ core engine keeps large models smooth to edit.

What is MBSE, and do I need a specialized tool for it?

MBSE (Model-Based Systems Engineering) is an engineering approach that uses formal models — rather than documents alone — as the primary artifact throughout a project lifecycle. A specialized tool matters because it enforces correct SysML notation, maintains live traceability between requirements, models, and tests, and can simulate behavior directly on the model. Draw+ for Windows covers SysML V2 modeling, requirements traceability, simulation, and on-device AI assistance in a single local-first Windows app for $10/month.

How does Draw+ compare to IBM Rhapsody or Cameo Systems Modeler?

Draw+ for Windows and IBM Rhapsody both support SysML V2 modeling and requirements traceability, but differ sharply in cost, deployment, and scope. Rhapsody and Cameo are enterprise suites priced in the tens of thousands of dollars per seat per year; Draw+ is a flat $10/month with no per-seat pricing. Rhapsody requires cloud connectivity or large enterprise infrastructure; Draw+ is fully local-first and works in air-gapped environments. Draw+ is designed for individuals, small teams, and engineers who need affordable local MBSE without a multi-year procurement process.

What is SysML V2 and why does it matter?

SysML V2 (Systems Modeling Language version 2) is the latest OMG standard for systems engineering modeling. It replaces SysML 1.x with a cleaner, text-first kernel called KerML, and defines 10 diagram types — Block Definition (bdd), Internal Block (ibd), Package (pkg), Parametric (par), Activity (act), Sequence (sd), State Machine (stm), Use Case (uc), Requirement (req), and Test (test) — each targeting a specific aspect of system design. Draw+ for Windows natively implements all 10 SysML V2 diagram types with a methodology-aware palette and validation.

Can Draw+ be used for safety-critical engineering such as ISO 26262 or DO-178C?

Draw+ provides requirements-to-test traceability and verification coverage reporting directly relevant to safety-critical workflows under ISO 26262, DO-178C, IEC 62304, and similar standards. The application itself is not a certified or qualified tool; using it in a formal certification context requires your organization to perform tool qualification independently. That said, Draw+ can help you build and maintain the requirements, model, and trace structure those standards require — including Satisfy and Verify links, gap analysis, and Git-versioned model history.

How does the on-device AI Co-Pilot work?

The AI Co-Pilot runs a quantized local language model on your Windows PC. When you type a natural-language prompt — for example, 'Create an activity diagram for a login flow' — the model generates SysML V2 nodes and links and places them on the canvas automatically. Because everything runs locally, your prompts, diagrams, and design data are never sent to any external server. This makes the AI Co-Pilot safe for confidential projects and air-gapped environments.

What file format does Draw+ use, and is it Git-compatible?

Draw+ saves models as KerML-compatible XML text files. The format is human-readable, so you can open model files in a text editor, diff them with standard tools, and commit them directly to Git. Version history, branching, and merging of design models work exactly like source code — no proprietary binary format and no cloud sync required.

Can I use Draw+ in an air-gapped or classified environment?

Yes. Draw+ is designed for local-first use. After installation, the application runs entirely without network access — modeling, simulation, AI assistance, and file saving all work offline. The subscription status is cached locally, so brief connectivity is needed only for monthly renewal checks. Day-to-day modeling is fully air-gapped compatible.

Does Draw+ support code generation?

Code generation is on the roadmap but is not available in version 1.0.0. The current release focuses on SysML V2 modeling, requirements traceability, three built-in simulators (activity token flow, sequence timelines, parametric constraint solver), and on-device AI. You can export diagrams and models to PNG, JPEG, SVG, and PDF for documentation and client deliverables.

KerML (Kernel Modeling Language) is the foundational semantic layer underlying SysML V2. It defines the core constructs — types, features, relationships, and behaviors — that SysML V2 diagrams are built on. Draw+ stores models as KerML-compatible XML text, which means the file is human-readable, version-controllable with Git, and structured consistently with the OMG standard.

Is Draw+ available for macOS or Linux?

Draw+ for Windows currently runs on Windows 10 and Windows 11 (64-bit). A separate macOS edition (Draw+ for Mac) is available at shokoma.com. Linux support is not currently planned.

オフラインで使えますか？

はい。Draw+ for Windows はローカル完結が前提です。ネットワークを使うのはサインインとサブスクリプションの確認だけで、モデリング・トレーサビリティ・AI 支援はすべてオフラインで動作します。エアギャップ環境でも使えます。

設計データはどこに保存されますか？

あなたの PC のローカルファイル（XML テキスト）です。クラウドには保存されません。テキスト形式なので、Git でそのまま差分管理・履歴追跡できます。

AI を使うと、設計が外部に送られますか？

いいえ。AI Co-Pilot は端末内のローカル LLM（llama.cpp、Llama-3.2-3B-Instruct を同梱）で動きます。あなたの図やプロンプトが外部サーバーに送信されることはありません。

無料で試せますか？

はい。全機能を、サインインなしで無料でお試しいただけます。図を描き、モデルを組み、AI に相談するところまで、お金はかかりません。なお無料版は存在せず、ローカルファイルへの保存（永続化）には月額 10 USD のサブスクが必要です。

解約は簡単ですか？

はい。購入・解約はブラウザで開く Stripe のホスト型ページ（Checkout / カスタマーポータル）で完結します。いつでも自分で解約でき、アプリ内に決済情報を抱え込みません。

チームで使えますか？

Draw+ は個人開発者向けに特化しています。チーム管理・共同編集・組織アカウント・権限管理（RBAC）は提供していません。一人ひとりが、自分の手元で完結して使うためのツールです。

日本語に対応していますか？

はい。UI は英語／日本語のバイリンガルで、メニュー・コンテキストメニュー・ダイアログまで、設定からいつでも切り替えられます。

どんな図が描けますか？

SysML V2（bdd / ibd / pkg / par / act / sd / stm / uc / req / test の 10 種）に加え、UML・BPMN・マインドマップ・基本図形に、同じキャンバスで対応します。

動作が重そうですが？

いいえ。Draw+ は Win32 + Direct2D のネイティブアプリで、Electron ではないため軽快で起動も一瞬です。C++ で書かれたコアエンジンが、大きめのモデルでもなめらかな編集を支えます。

MBSE とは何ですか？専用ツールは必要ですか？

MBSE（モデルベースシステムズエンジニアリング）は、ドキュメントだけでなく正式なモデルをプロジェクト全体の主要成果物として使用するエンジニアリング手法です。専用ツールが重要なのは、正しい SysML 記法を強制し、要求・モデル・テスト間のトレーサビリティをリアルタイムに維持し、モデル上で直接シミュレーションできるためです。Draw+ for Windows は、SysML V2 モデリング・要求トレーサビリティ・シミュレーション・オンデバイス AI 支援をすべて 1 つのローカル完結 Windows アプリに収め、月額 10 USD で提供します。

IBM Rhapsody や Cameo Systems Modeler と比べてどうですか？

Draw+ for Windows と IBM Rhapsody はどちらも SysML V2 モデリングと要求トレーサビリティをサポートしていますが、コスト・展開方法・対象規模が大きく異なります。Rhapsody や Cameo はシート単位で年間数十万〜数百万円のエンタープライズスイートですが、Draw+ は per-seat 課金なしの月額 10 USD（フラット）です。Rhapsody はクラウドや大規模インフラを前提としますが、Draw+ は完全ローカル完結でエアギャップ環境でも動作します。個人・小規模チーム・クラウドを使えないエンジニアのための、手の届く MBSE ツールです。

SysML V2 とは何ですか？なぜ重要なのですか？

SysML V2（Systems Modeling Language バージョン 2）は、システムズエンジニアリングモデリングのための最新 OMG 標準です。SysML 1.x を刷新し、KerML というクリーンなテキストファースト基盤を採用。ブロック定義図（bdd）・内部ブロック図（ibd）・パッケージ図（pkg）・パラメトリック図（par）・アクティビティ図（act）・シーケンス図（sd）・状態機械図（stm）・ユースケース図（uc）・要求図（req）・テスト図（test）の 10 種類の図を定義し、システム設計の各側面に対応します。Draw+ for Windows はこの 10 種類すべてをネイティブに実装しています。

ISO 26262 や DO-178C などの安全クリティカルな開発に使えますか？

Draw+ は、ISO 26262・DO-178C・IEC 62304 などの安全規格が求める要求↔テストのトレーサビリティと検証カバレッジレポートを直接提供します。ただし、アプリ自体はこれらの規格における認定・適格化ツールではありません。正式な認証プロセスでの使用には、組織による独自のツール適格化が必要です。Satisfy / Verify リンク・ギャップ分析・Git 版管理による設計履歴など、規格が求めるモデルと追跡構造の構築・維持には十分活用できます。

オンデバイス AI Co-Pilot はどのように動作しますか？

AI Co-Pilot は llama.cpp を使って量子化済みのローカル言語モデルを Windows PC 上で直接実行します。「ログインフローのアクティビティ図を作成して」のようなプロンプトを入力すると、モデルが SysML V2 のノードとリンクを自動生成し、キャンバスに配置します。すべてがローカルで完結するため、プロンプト・図・設計データが外部サーバーに送信されることはありません。機密プロジェクトやエアギャップ環境でも安心して使用できます。

Draw+ が使うファイル形式は何ですか？Git と互換性はありますか？

Draw+ は KerML 互換の XML テキストファイルでモデルを保存します。テキスト形式なので、テキストエディタで開いたり、Git で差分を取ったり、ソースコードと同じリポジトリにコミットしたりできます。設計のバージョン管理・ブランチ・マージがコードと同じ流儀で動き、独自バイナリ形式もクラウド同期も不要です。

エアギャップ環境や機密性の高い環境で使えますか？

はい。Draw+ はローカル完結を前提に設計されています。インストール後、モデリング・シミュレーション・AI 支援・ファイル保存はすべてネットワークなしで動作します。サブスクリプション状態はローカルにキャッシュされるため、月次の更新確認時のみ短時間の接続が必要ですが、日常のモデリング作業は完全にエアギャップ対応しています。

コード生成に対応していますか？

コード生成はロードマップに含まれていますが、バージョン 1.0.0 では未実装です。現在のリリースは、SysML V2 モデリング・要求トレーサビリティ・3 種類のシミュレーター（アクティビティトークンフロー・シーケンスタイムライン・パラメトリック制約ソルバー）・オンデバイス AI に注力しています。図とモデルは PNG・JPEG・SVG・PDF にエクスポートして文書化や納品に活用できます。

KerML とは何ですか？

KerML（Kernel Modeling Language）は、SysML V2 の基盤となる意味論層です。型・フィーチャー・関係・振る舞いなどの核心構成要素を定義し、SysML V2 図の土台を担います。Draw+ はモデルを KerML 互換の XML テキストで保存するため、ファイルは人間が読め、Git でバージョン管理でき、OMG 標準に沿った一貫した構造を持ちます。

macOS や Linux 版はありますか？

Draw+ for Windows は現在 Windows 10 / Windows 11（64bit）向けにのみ提供されています。macOS 向けには別の Draw+ for Mac が shokoma.com で提供されています。Linux は現時点では対応予定がありません。

Draw+ for Windows — Privacy Policy (Handling of Personal Information)

Service: Draw+ (Draw+ for Windows, the "Service")

Established: June 12, 2026　Last revised: June 12, 2026

1. Basic Policy

shokoma (the "Company") recognizes the importance of users' personal information in providing the Service, complies with the Act on the Protection of Personal Information ("APPI") and other applicable laws and guidelines, and handles personal information appropriately in accordance with this Privacy Policy (this "Policy").

The Service is designed around a "local-first" principle: the artifacts you create and edit — diagrams, models, and the like — are, in principle, stored only in local files on your own device. Except for the limited information described below (such as account and billing status), the Company does not collect or retain your artifacts themselves (Section 10).

2. Business Operator Information (Personal Information Handling Operator)

Operator: shokoma
Address: Disclosed without delay in writing or by email upon request.
Representative: Shohei Komatsu
Personal Information Protection Manager: Shohei Komatsu
Contact: https://shokoma.com/contact

3. Definitions

Personal information: "personal information" as defined in Article 2(1) of the APPI — information about a living individual that can identify the specific individual by name, email address, or other description (including information that can be readily collated with other information, thereby identifying the individual).
User: anyone who uses the Service (whether or not they have created an account).
Account: the user-identifying information tied to an individual user, created by signing up / signing in to the Service.
Artifacts: the diagrams, models, nodes, text, and other data that a user creates or edits using the Service.

4. Information We Collect and How

The Company collects the following information to the extent necessary to provide the Service.

4.1 Account Information (Authentication)

The Service's account feature uses Firebase Authentication (provided by Google LLC). When you sign up / sign in, the following is collected:

Email address
An account identifier assigned by the authentication platform
Password (the Company does not retain plaintext passwords; they are managed securely by the authentication platform)
Authentication-related metadata such as sign-in timestamps and method

4.2 Payment / Subscription Information

Payments for the Service are processed through the payment platform provided by Stripe (Stripe, Inc. and its affiliates).

Payment details such as credit card number, expiration date, and security code are collected and managed directly by Stripe and do not pass through the Company's devices or servers. The Company does not retain this card information.
The Company (or its billing-management service) collects and retains only the minimum information needed to determine billing status: an identifier for your account, an identifier issued by the payment platform, and your subscription state and billing period.

4.3 Usage / Diagnostic Information (Telemetry)

Usage and diagnostic information (telemetry) for quality improvement and defect analysis is not sent by default (opt-in). Only if you explicitly enable it in settings may anonymous or pseudonymized usage statistics and error information be collected. In air-gapped environments, telemetry can be fully disabled.

4.4 Information Associated with AI Features

The Service's AI Co-Pilot runs on your device (on-device) by default and does not send diagrams, models, prompts, or the like externally.

Only if you voluntarily select (opt in to) a cloud LLM (a language model provided by an external AI vendor) will the prompts you enter and related model information be sent to that external AI vendor. In that case, handling is also subject to that vendor's privacy policy.
Unless you select a cloud LLM, using AI features does not transmit your artifacts externally.

4.5 Inquiry Information

If you contact us, we collect the content of your inquiry, your email address, the history of correspondence, and similar information.

4.6 Information Stored Only on Your Device

Artifacts (diagrams, models, etc.), the list of recently opened projects, and locally cached authentication / subscription-status information are stored on your device. These are not sent to the Company's servers and are not collected by the Company.

5. Purposes of Use

To provide the Service, verify identity, and authenticate / manage accounts
To handle subscription sign-up, billing, renewal, cancellation, and status determination (including determining whether the save feature is available)
To charge fees, process payments, and issue receipts / invoices
To respond to user inquiries and provide support
To address defects and to maintain and improve the quality and features of the Service (where telemetry is enabled)
To detect, prevent, and respond to violations of the terms and to misuse
To send important notices (changes to terms / policies, material changes to or failures of the Service, etc.)
To fulfill legal obligations

If the Company handles personal information beyond the above purposes, it will obtain your consent in advance.

6. Provision to Third Parties

The Company will not provide personal information to third parties without your prior consent, except where:

required by law;
necessary to protect a person's life, body, or property and obtaining consent is difficult;
especially necessary to improve public health or promote the sound upbringing of children and obtaining consent is difficult;
necessary to cooperate with a state agency, local government, or their delegate in performing legally prescribed duties, and obtaining consent may impede those duties; or
personal information is provided in connection with a business succession due to a merger or other cause.

7. Subcontractors / External Services

The Company may outsource all or part of the handling of personal information, or integrate with external services, to the extent necessary to achieve the purposes of use, and will exercise necessary and appropriate supervision over such parties. The main external services are:

External service	Provider	Main information handled	Purpose
Firebase Authentication	Google LLC	Email address, user UID, authentication metadata	Account authentication / management
Stripe (payments / Customer Portal)	Stripe, Inc. and others	Payment details (not retained by the Company), customer ID, billing status	Payment / subscription management
Cloud LLM (only if you opt in)	The AI vendor you select	Prompts you enter, etc.	Providing AI assistance features

Please refer to each provider's privacy policy regarding their handling of personal information.

8. Retention Period

The Company retains personal information only for the period necessary to achieve the purposes of use or as required by law, and promptly deletes or anonymizes it thereafter. If you delete your account, the Company will delete account-linked information it holds within a reasonable period, except information subject to retention obligations under billing, tax, or other laws.

9. Security Management Measures

Delegating authentication and payments to proven external platforms (Firebase Authentication, Stripe) and designing the system so the Company does not retain sensitive information (plaintext passwords, card details)
Encryption in transit (HTTPS) and appropriate protection of stored data
Minimizing access privileges and limiting the personnel who handle data
Keeping authentication / subscription tokens stored locally short-lived and discarding them on sign-out
Limiting data retained by the Company to the minimum needed for billing and authentication (data minimization)

10. Local-First Principle (Artifacts Not Transmitted)

The Service stores your artifacts (diagrams, models, etc.) only in local files and does not offer cloud storage or cross-device sync. The Company's servers do not collect or store your model contents, project contents, or telemetry (except when opted in). Signed subscription-status tokens and other data never contain the body of your artifacts.

11. Cookies and Similar Technologies

The desktop application itself does not primarily use cookies in the way a web browser does. However, when a browser is used for payments / Customer Portal (Stripe) or authentication, those external services may use cookies, etc., subject to their respective policies.

12. Your Rights

As provided by law, you may request the following regarding your personal information held by the Company:

Notification of the purpose of use
Disclosure (including provision of electromagnetic records)
Correction, addition, or deletion of content
Suspension of use or erasure
Suspension of provision to third parties

To make such requests, contact us via the channel in Section 16. After verifying your identity, the Company will respond within a reasonable period in accordance with law.

13. Cross-Border Transfer of Personal Information

Some external services used by the Service (Google, Stripe, the cloud LLM vendor you select, etc.) may process information on servers outside Japan. Please understand in advance that such cross-border transfers may occur when you use the Service and opt in to certain features.

14. Use by Minors

If you are a minor, please use the Service (particularly subscribing to the paid plan) only with the consent of a parent or other legal representative.

15. Changes to This Policy

The Company may revise this Policy in response to changes in law or the Service. For material changes, the Company will provide notice by posting on the Service or by other appropriate means. The revised Policy takes effect when posted on the Service.

16. Contact

Operator: shokoma
Attn: Personal Information Protection Manager
Contact: https://shokoma.com/contact