Graph Paper Pro vs Springs3D Studio

Draw like you're on real graph paper, only faster. Graph Paper Pro is a focused workspace for building geometric and 3D drawings on graph or dot paper. Place anchored lines that snap with precision, fill closed shapes with solid or gradient color, and finish with clean PNG exports. Why this app - Built for people who love drawing on graph paper: 3D doodles, optical illusions, cubes, isometric-style sketches, and clean diagrams. - iPhone, iPad, and Mac support. Apple Pencil works with the included freehand tools. - Offline-first. No sign-up, no internet required. Tools that ship - Line, Fill, Eraser, and Freehand tools with a simple drawing workspace. - Snap and precision controls for confident placement. - Fill supports solid and gradient colors on closed shapes. - Draw Behind mode for the freehand tool to sketch under your shapes. - Unlimited undo/redo. - Sample projects to learn techniques fast. Paper you control with Pro - Switch between graph or dot paper. - Customize paper color, grid line color/thickness, dot color/size, and drawing line widths. - Create unlimited projects. - Unlock all export styles. Export - Export on a solid background, with grid/dots showing, or transparent PNG. - Share straight from the export sheet. Pricing - Free: up to 3 projects, limited customization, and basic export. - Pro Monthly: $3.99/month. - Pro Annual: $19.99/year with a 7-day free trial for eligible new subscribers. - Pro Lifetime: $49.99 one-time purchase. Existing buyers of the original $9.99 lifetime unlock keep Pro forever and do not need to subscribe. Subscription terms Payment is charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. You can manage or cancel subscriptions in your App Store account settings. Feedback & Support: https://forms.gle/YX3prmEVkRtfS16U6 Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

The world's #1 spring design software. Springs3D Studio is a parametric 3D editor for designing custom springs — compression, extension, torsion, double torsion, and conical — with live engineering feedback at every step. DESIGN IN 3D Every parameter of the spring is live in an interactive 3D model. Change the wire diameter and the coils update instantly; drag the handles to adjust length, diameter, and pitch directly in the viewport. Shape extension hooks and end features with a dedicated end editor. ENGINEERING, NOT GUESSWORK Spring rate, stresses, solid height, buckling, and fatigue indicators are computed continuously as you edit. Problems surface while you design — not after the part has been quoted or wound. START FROM THE APPLICATION Describe what the spring must do — loads, travel, available space — and the AI engineer proposes a complete, standards-based starting design: geometry, material, and end types, ready to refine. MEASURE A REAL SPRING Point the camera at a physical spring to capture its dimensions and load them straight into the editor — ideal for reverse-engineering a sample or replacing a worn part. FROM MODEL TO MANUFACTURING Check manufacturability as you go, save and revisit designs, and export production-ready geometry — including STL and STEP — for CAD, simulation, or quoting. HIGHLIGHTS • Compression, extension, torsion, double torsion, and conical springs • Live parametric 3D model with direct-manipulation handles • Continuous spring rate, stress, buckling, and fatigue feedback • AI inverse design from plain-language requirements • Camera measurement of physical springs • STL and STEP export • Available in English, Portuguese, and Italian Whether you are an engineer specifying a custom part, a buyer replacing a legacy spring, or a manufacturer preparing a quote, Springs3D Studio turns spring design from spreadsheets and catalog lookups into a single, visual workflow.