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Up to three tools. The table shows the data as-is, without picking a “best”.
| Field | D2 | Lychee | Syncthing |
|---|---|---|---|
| Platforms | Universal | Universal | Universal |
| Local support | Yes | Yes | Yes |
| Paid API | No | No | No |
| License | MPL-2.0 | MIT OR Apache-2.0 | MPL-2.0 |
| Stars | 25761 | 4065 | 89890 |
| Last activity | October 11, 2026 | October 26, 2026 | October 13, 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. | — | Moderate: pair both devices and share folders; APT requires official stable-v2 repository setup first |
| Category | Workflow, UI | Testing, Workflow | Security, Workflow |
| 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. | For documentation authors and small teams checking references locally or in CI. Start with a specific file and interpret findings; it does not establish complete site or login functionality. | Best for an individual working across two computers or a small team sharing files with trusted devices. It moves folder changes instead of repeating manual copies, while keeping device and storage choices under your control. It does not replace independent backups or collaborative editing, and devices holding the files must be reachable. |