Contact person: App to sale course material.payment gateway.salable API .subscription model

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Location: Patna, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I want to launch a cross-platform “digital paper” application that feels as natural as writing on real paper yet gives users the convenience of modern cloud tools. The canvas must accept handwriting by finger, a stylus pen, and even the pencil nib without any perceptible lag. Inside the workspace, users should be able to pick colours from a simple colour box, switch pen thickness, and instantly wipe strokes with an eraser tool.

Because many writers dislike intrusive helpers, spell-check and autocorrect must stay completely disabled. I also need an optional window-switch blocker so the session can be locked full-screen—useful for exams or focused note-taking. A small, always-visible clock in one corner is required so people can keep track of time without looking away.

Core features I’m aiming for:
• Real-time ink rendering for finger, pen, and pencil inputs
• Colour palette + eraser exactly as described above
• No autocorrect / spell-check anywhere in the editor
• Toggleable window-switch blocker (Windows, macOS, iPadOS, Android)
• Seamless sync across devices (think personal cloud or popular services via OAuth)
• Deep linking that lets a note connect out to any website or third-party app with one tap
• Subscription model architecture ready for monthly or annual plans (Stripe or similar)

Deliverables I need in the first milestone are:
1. Functional prototype with finger/pen/pencil writing, colour box, eraser, and clock.
2. Technical roadmap showing how you will add sync, linking, subscription, and the window blocker.

If you have experience building handwriting engines (e.g., Wacom, Apple Pencil, Windows Ink), cross-platform frameworks (Flutter, React Native, Electron, or native where justified), and secure subscription flows, you’ll fit perfectly. Send over a short note on the libraries you’d propose, a sample of past handwriting or drawing work, and your estimated timeline for the prototype." (client-provided description)