Compare
Up to three tools. The table shows the data as-is, without picking a “best”.
| Field | D2 | Hurl | Miller |
|---|---|---|---|
| Platforms | Universal | Universal | Universal, MCP, Claude Code, Codex, Cursor |
| Local support | Yes | Yes | Yes |
| Paid API | No | No | No |
| License | MPL-2.0 | Apache-2.0 | BSD-2-Clause |
| Stars | 25761 | 19288 | 10051 |
| Last activity | October 11, 2026 | October 17, 2026 | October 21, 2026 |
| Install complexity | Easy with a supported package manager; Homebrew must already be installed for this command. Official binaries, Windows, Linux, and source options are documented. | Easy; API and CLI knowledge required | EASY |
| Category | Workflow, UI | Testing, DevOps | Workflow, Data |
| Best use | For developers and small teams that want architecture and data-flow diagrams close to the repository and reviewable as text. Use it when relationships matter more than pixel-perfect placement; not for free-form marketing design or exact manual positioning. | Best for a developer or small team that wants repeatable API checks with explicit conditions stored beside the code. It links request data and identifies failing assertions without repeating manual inspection. It does not replace browser tests or test-environment setup; curl may be enough for a one-off request. | Ideal for developers, data analysts, and operators who need to clean a CSV export, inspect JSON Lines, or summarize a large file from the terminal without starting a Python project. Use it for quick, repeatable file processing; concurrent transactions and advanced visual analysis still call for a database or complementary analytics tool. |