PromptShift is a sovereign developer tool that translates entire AI assistant contexts, instruction files, master prompts, and system rules between Cursor (.cursorrules / .mdc), Anthropic Claude Projects, OpenAI Custom GPTs, and Google Gemini / Antigravity in one click.

Is my source code and proprietary API keys secure?

Yes. PromptShift operates with strict in-RAM processing and zero server retention. All uploads are processed ephemerally and sanitized in memory to redact leaked API keys (OpenAI, Anthropic, Stripe, AWS, HuggingFace, etc.) before conversion. Nothing is saved to a persistent server disk or database.

What are the pricing options and tiers?

PromptShift offers a Free Starter tier (instant conversion for projects up to 2 files with zero signup), a Single Migration Pass at $1.99 for one-off full project exports, a Pro Developer plan at $5.99/mo for unlimited multi-ecosystem migrations, and a Team & Agency pass at $19.99/mo.

Which AI platforms are currently supported?

PromptShift supports bidirectional migration between Anthropic Claude (.claude / system instructions), Cursor (.cursorrules / .cursor/rules/*.mdc), OpenAI Custom GPTs / Assistants v2, Google Gemini & Antigravity, and GitHub Copilot Workspace.

Can I convert back and forth without losing rules?

Yes! PromptShift uses a unified AST intermediate representation (CAPS) that preserves 98.5%+ certified semantic fidelity. Autonomy directives, tone, architecture policies, and negative constraints are mapped without prompt drift.

How do I manage my billing, receipts, and VAT invoices?

All checkouts and subscriptions are securely processed by Polar.sh as Merchant of Record. You can access your 1-click self-service customer portal directly inside PromptShift to manage billing, download tax-compliant VAT invoices, and adjust plans anytime.

98.5% Certified Semantic Parity•100% In-RAM Zero-Retention

Convert Claude Projects to OpenAI Custom GPT

Migrate your Claude Project instructions, XML prompts, and knowledge base into OpenAI Custom GPTs effortlessly.

🚀 Launch 1-Click Converter (Anthropic Claude → OpenAI Custom GPT)📖 Migration Guide & Specs

01Architecture & File Mapping

Source Project Structure

Anthropic Claude

📄CLAUDE.md
📄claude_project_instructions.xml

Transpiled Target Structure

OpenAI Custom GPT

✨OPENAI_SYSTEM_PROMPT.md
✨custom_gpt_instructions.txt
✨custom_gpt_manifest.json
✨openai_assistant_v2.json

Anthropic Claude Directive	OpenAI Custom GPT Equivalent	Semantic Bridge Behavior
<instructions> XML block	OPENAI_SYSTEM_PROMPT.md	Transforms structured XML into GPT-4o optimized markdown
Claude Project Knowledge	OpenAI Vector Store Files	Packages documentation files for assistant file search
CLAUDE.md workspace rules	Active Constraints list	Maintains critical coding guidelines without prompt drift

02Step-by-Step Migration Walkthrough

Upload your Anthropic Claude workspace files

Drag and drop your project repository or specific rule files (CLAUDE.md, claude_project_instructions.xml) into the PromptShift workspace. All reading and parsing is performed strictly in your browser RAM without disk persistence.

Inspect Automated Secret Sanitization & AST Fidelity

PromptShift executes active secret sanitization in memory, redacting exposed API keys (OpenAI, Anthropic, Stripe, AWS, HuggingFace) before compiling to the Canonical AI Project Schema (CAPS) with certified 98.5% semantic parity.

Export Ready-to-Run OpenAI Custom GPT Package

Click download to receive your fully structured ZIP archive containing OPENAI_SYSTEM_PROMPT.md, custom_gpt_instructions.txt, custom_gpt_manifest.json, openai_assistant_v2.json. Drop these files directly into your workspace to instantly begin using your AI assistant.