RE:solid STL & STEP Viewer

No subscription. No account. No cloud upload. Your files never leave

the phone — STEP included

RE:solid 3D Viewer is a fast, intuitive tool for professional 3D model visualization and analysis right on your mobile device.

📦 Format support

The app works with the main industry standards:

• STL: the most popular 3D-printing format (binary and ASCII).

• OBJ: materials and colors from a .mtl file. Select .obj and .mtl together in the file picker — colors apply without an extra step.

• 3MF: the modern additive-manufacturing format, with colors.

• STEP (.step, .stp) [PRO]: view complex engineering geometry with high precision.

• ZIP: archives open without unpacking. Several models inside? The app shows a list, or opens them all at once.

🔓 Free and RE:solid Pro

Viewing is free forever: STL, OBJ, 3MF, ZIP archives, Rendered mode, materials, colors, dimensions and all controls.

Engineering tools marked [PRO] unlock with a one-time purchase — no subscription, yours forever.

Before buying, 3 free trial sessions give full access to every Pro tool.

✂️ Section analysis [PRO]

Cut the model along X, Y, Z or perpendicular to your line of sight — look inside the structure from any angle, CAD-style.

Hatched cross-section with a black outline, separate colors for each body in an assembly, and precise keyboard input for the plane's position.

📏 Smart Snap measuring [PRO]

Take precise measurements in one tap:

• Ruler: straight-line distance and XYZ-axis offset.

• Smart snapping: automatic detection of the model's corners and vertices.

• Radius & diameter: three points on a circle give you its parameters instantly.

• Angles: between the model's faces.

• Wall thickness: one tap on a surface shows the material thickness at that point.

• Measurement history: every measurement in the session, copied to the clipboard. Units in mm or inches.

⚖️ Weight & volume calculation [PRO]

Estimate a part's mass instantly:

• Real-time volume calculation; hidden parts are excluded from the weight.

• Preset densities for popular plastics (PLA, PETG, ABS, PA12-CF nylon).

• Metals: steel, aluminium, copper, 925 silver and gold (14K, 18K).

💾 Save to STL [PRO]

What you see is what gets saved: a single part, an assembly without the clutter, or several files merged into one. Works with any format the app opens — making it a STEP-to-STL converter too.

🧩 Working with assemblies

• Parts list: every part by name, like the browser tree in CAD. Names come from the file — STEP, OBJ, 3MF. The list is a sheet along the bottom, so the model above stays visible and under your control.

• Split into bodies: an STL that looks like one solid chunk splits itself into separate parts — even if the format stores no structure at all.

• Hide / isolate a part [PRO]: press and hold a part, or use the list, to hide it or keep only it on screen.

• Exploded view [PRO]: pull complex assemblies apart with a slider.

🛠 Professional viewing tools

• Rendered (realistic) and Shaded (matte) modes — free.

• Materials: gold, silver, chrome, copper and glass with physically correct lighting.

• Technical modes [PRO]: Wireframe, X-ray, Ghosted, Technical.

• Orthographic and perspective cameras — undistorted or with realistic depth.

• Navigation cube: jump between standard views instantly.

🌐 Fully offline

Every format, STEP included, is processed right on the device — no data ever leaves the phone. Works offline from the very first launch. Most viewers send STEP files to the cloud for conversion — RE:solid never does.

🚀 Built for mobile

• Speed: opens large models with ease (100+ MB).

• Zen mode: hide the interface with a double tap to focus on the model.

• Lighting joystick: control the light in real time.

• Haptic feedback: sliders and mode switches respond to touch.

• Settings: background color, shadows, grid.

• Languages: Ukrainian and English.

RE:solid 3D Viewer is your portable engineering desk. View, measure, analyze and save 3D models anywhere, anytime.