GCodeReader CNC vs ScreenTwin

Inspect CNC toolpaths and CAD models locally on your iPhone or iPad. Open files from Files, explore geometry in 3D and review machining programs without an account or cloud conversion. SLDPRT PART VIEWING • View SLDPRT parts in 3D, including saved solid bodies, surfaces and sketch curves. • Show or hide individual bodies and surfaces. • Rotate, pan and zoom, or switch between standard views. • CAD files are opened for viewing; the original CAD file is not modified. G-CODE REVIEW • Explore 3D toolpaths with axes, a grid and view presets. • Play back a program and adjust playback speed. • Review cutter names and diameters from CAM comments, tool numbers, feed rates, spindle speed and estimated run time. • Check X, Y and Z trajectory dimensions, including rapid moves. • Collapse the program information panel to make more room for the toolpath. • Edit feed and spindle values, then explicitly save the file or export a copy. CAD AND 3D MODELS • Open STEP, IGES, BREP and DXF exchange files. • Inspect mesh and scene formats including STL, OBJ, PLY, USD/USDZ, Alembic, DAE and SCN. • View model dimensions, geometry counts and available body information. • Additional previews are available for Parasolid, DWG and CDR, with partial format coverage. FILE COMPATIBILITY SLDPRT viewing uses geometry stored in the part file. Compatibility with native formats depends on the file version and available data. SLDASM assembly import is not supported. For unsupported files, export to STEP, IGES, STL or DXF in the authoring application. LOCAL WORKFLOW Selected files are processed on your device. No sign-in or upload to a conversion service is required. Privacy information and third-party licenses are available from the information button inside the app. Estimated CNC run time is an approximation. Review any edited program before using it on a machine.

ScreenTwin turns any screenshot into an interactive design inspection canvas. Measure spacing, sample colors, read typography, and export developer-ready specs — without leaving your phone. MEASURE ANYTHING • Distance, width and height between any two points • Horizontal and vertical guides that snap to detected edges • Zoom to 20× for sub-pixel work • Smart snapping to edges, centers, baselines and equal spacing • A floating ruler you can drag and rotate, with a live angle readout • Units in px, pt, dp, mm, cm or inches — or define your own INSPECT EVERY DETAIL • Long-press anywhere for a magnified eyedropper • Every notation: HEX, RGB, HSL, HSB, CMYK, LAB, LCH, OKLab, OKLCH • Copy-ready Flutter, SwiftUI, UIColor, Compose and CSS literals • WCAG contrast ratios against white and black • Color harmonies and 50–900 tonal ramps generated in OKLCH • On-device OCR estimates font size, weight and line height ANALYZE THE LAYOUT • Detects buttons, cards, icons, avatars, navigation bars, tab bars, text fields and dividers • Every detection shows its confidence and the rule behind it • Automatic spacing analysis: gaps, padding, margins and element sizes • A 0–100 score for how closely a design follows an 8-point grid • The spacing scale your screen actually uses EXPORT DEVELOPER-READY SPECS • Annotated PNG and machine-readable JSON • PDF spec sheets for handoff • Paste-ready SwiftUI and Flutter code • Design tokens as a Flutter theme, SwiftUI, CSS variables, JSON or W3C Design Tokens REVIEW TOGETHER • Comment pins, arrows, highlights, rectangles and freehand marks • Status and resolve tracking on every note • Compare two versions with slider, split, overlay or difference modes PRIVATE BY DESIGN Everything runs on your device. Your screenshots never leave your phone, and the app works fully offline. FREE Manual measurement, OCR typography, the color picker, and PNG and JSON export. PRO AI component detection, spacing analysis, design tokens, compare mode, unlimited projects, and PDF, SwiftUI and Flutter export. MADE FOR iOS and Flutter developers, UI/UX designers, QA engineers and product teams. Privacy Policy: https://screentwin.netlify.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/