Fast STL Viewer

Professional STL inspection and measurement on Android. Wall thickness analysis, printability checks, point-to-point distance, volume, surface area, cross-sections — tools that used to require a desktop workstation, now in your pocket.

Trusted by engineers, dental technicians, medical device teams, jewellery designers, and quality control inspectors worldwide. Over 1 million downloads.

PRO INSPECTION TOOLS

▸ Wall Thickness Heatmap

Spot thin walls and weak points before they become print failures. Color-coded heatmap (red → yellow → green) maps thickness across your entire model. First mobile STL viewer with wall thickness analysis.

▸ Printability Dashboard

Four automated mesh checks: open edges, flipped normals, non-manifold geometry, degenerate triangles. Interactive 3D overlay highlights each issue directly on your model. Catch defects before they waste material and machine time.

▸ Normal Visualization

Per-face normal vectors with adjustable length, color, and thickness. Verify surface orientation at a glance — essential for diagnosing reversed faces and print artifacts.

▸ Cross-Section Slicing

Adjustable X, Y, Z cutting planes to inspect internal geometry. See what's inside without splitting the file.

MEASUREMENT TOOLS

- Point-to-point distance — tap two points, get the dimension

- Volume and surface area with unit selector (mm, cm, in)

- Bounding box dimensions (X, Y, Z)

- Properties panel: triangle count, dimensions, full geometry stats

VISUALIZATION

- 5 rendering modes: shaded, wireframe, combined, point cloud, normals

- 6 standard views: top, bottom, left, right, front, back

- Orthographic projection for accurate dimensional inspection

- Custom mesh, scene, wireframe, and point cloud colors

- Adjustable lighting — matte to glossy material appearance

- Automatic detection of unconnected components within a single file — instantly color-coded for assembly review

- Open boundary detection — identify non-watertight geometry before printing

WORKFLOW

- Load multiple STL files for side-by-side comparison

- Open from Gmail, Google Drive, WhatsApp, or any file manager

- Share STL files directly from any app

- Select and open multiple files at once via the in-app file picker

- Save and export

BUILT FOR PERFORMANCE

OpenGL ES 3.2 and native C++ with hardware-accelerated mesh analysis. Handles files with millions of triangles. Binary and ASCII STL.

USED BY PROFESSIONALS IN

◆ Engineering & QC — Verify wall thickness on brackets, housings, and structural components. Inspect cross-sections. Measure dimensions before manufacturing. On-device inspection for incoming parts.

◆ 3D Printing — Run printability checks before every print. Open edges, flipped normals, thin walls — catch them before they cause failures.

◆ Dental — Inspect crowns, bridges, and aligners. Measure dimensions, verify wall thickness on thin anatomical geometry.

◆ Medical Devices — Review implant and prosthetic STL files. Cross-section through anatomy, verify specs.

◆ Jewellery — Wall thickness on filigree and prong settings. Mesh integrity before casting.

Try any Pro feature free — watch a short video to unlock for 1 hour. Upgrade to Pro to keep them all.