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Snapline - Rulers & Guides

by benedetto battipede·Workflow

Images © benedetto battipede. Used for product review; image policy.

Why we like it

Snapline earns its place in the Superhive library by filling a specific gap: a rulers-and-guides layer between Blender's viewport and camera frame, built to leave Cycles and EEVEE outputs untouched.

What is Snapline - Rulers & Guides?

Snapline - Rulers & Guides brings the ruler-and-guide layer familiar from Photoshop, After Effects and compositing tools into Blender's 3D viewport. Drag a ruler from the top or left edge to drop a vertical or horizontal guide anywhere on screen, and drag an existing guide off-canvas to delete it. Lines are drawn in cyan (#19BFFF) so they read against any viewport theme.

Guides can be camera-anchored, the default mode, so they stay locked to the active camera frame through any view change, or viewport-anchored for general screen layout. One-click presets cover Rule of Thirds, Golden Ratio, Center Cross and Quarters, and presets can replace existing guides or stack together. A dedicated transform operator snaps the active object onto guides as you move it, with configurable tolerance and X/Y axis lock, plus a one-shot operator that aligns the pivot to the nearest guide intersection.

Guides persist per scene and save with the .blend file. Snapline is built with no depsgraph writes and no render-time modifications, so it has zero impact on Cycles or EEVEE outputs. It ships as a single self-contained file with a full PDF manual and quick-start README.

Who is Snapline - Rulers & Guides best for?

Snapline - Rulers & Guides is best for blender artists who compose, frame and align in the viewport and want ruler-and-guide tools like those in Photoshop and After Effects.

How much does Snapline - Rulers & Guides cost?

Snapline - Rulers & Guides is completely free to download and use.

Key features

  • Drag-to-create rulers: drop vertical or horizontal guides from the top or left band, delete by dragging off-canvas, drawn in cyan #19BFFF
  • Camera-anchored mode locks guides to the active camera frame, or viewport-anchored mode locks them to the screen
  • One-click composition presets for Rule of Thirds, Golden Ratio, Center Cross and Quarters, which can replace or stack
  • Magnetic snap on move with a dedicated transform operator, configurable tolerance and X/Y axis lock, plus snap-to-nearest-intersection
  • Smart snap while dragging: hold CTRL to snap to thirds, halves and quarters, hold SHIFT for fine 5% steps
  • Lock View freezes orbit, pan and zoom while composing, with numpad view teleports still active
  • Per-scene guides that save with the .blend file and render-safe design with no depsgraph writes

Tags

#rulers#guides#composition#camera framing#alignment#snap#layout#blender

Frequently asked questions

Does Snapline - Rulers & Guides work with Blender 5.0?

Snapline - Rulers & Guides requires Blender 5.0 or higher. It runs on Windows, macOS and Linux with no external dependencies and no internet connection required. The add-on ships as a single self-contained file, snapline.py, alongside a full PDF manual covering shortcuts and workflows and a README with quick-start instructions. On macOS the CTRL key maps to the Command key for the default shortcuts. Check the developer's page for the current details before installing.

How do I install Snapline - Rulers & Guides in Blender?

Snapline - Rulers & Guides is installed by downloading the ZIP from your Superhive library, then opening Blender and going to Edit, Preferences, Add-ons, Install from Disk. Select either snapline.py or the ZIP, since both work, then enable the checkbox next to Snapline. Once enabled, press CTRL+ALT+R in the 3D viewport or open the N-panel under View to reach Snapline. There are no license keys, no online activation and no node setup.

Does Snapline - Rulers & Guides affect Cycles or EEVEE renders?

Snapline - Rulers & Guides is render-safe by design and has zero impact on your Cycles or EEVEE outputs. It performs no depsgraph writes and makes no render-time modifications. Its guides are drawn as a viewport composition layer and save per scene with your .blend file, so a project reopens with the composition exactly where you left it. This is described as built on lessons from years of Blender add-on development.

Can I change the Snapline keyboard shortcut?

Snapline - Rulers & Guides uses CTRL+ALT+R by default to toggle rulers, and all shortcuts are customizable via Edit, Preferences, Keymap, 3D View. On macOS the CTRL key maps to the Command key. During a ruler drag you can also hold CTRL to snap guides to thirds, halves and quarters, or hold SHIFT for fine 5% steps. The magnetic snap transform operator adds X/Y axis lock during its modal for precise placement.

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