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.