I'm a solo founder who spent 6 years as a marketing analyst before switching to building products. After writing thousands of prompts for different AI models, I noticed I was doing the same optimizations over and over.
So I built Oshn Prompt — a macOS menu bar app that transforms any selected text into an optimized prompt with Cmd+Shift+I.
What it does: - Auto-detects intent (text AI vs image AI vs video AI) - Applies model-specific optimization (prompts for Claude ≠ prompts for Midjourney) - Voice input via Whisper for hands-free prompting - Works globally in any app
Technical stack: Swift/SwiftUI, runs locally, API calls only for the AI improvement step.
Free tier: 50 prompts. Pro: $9.99/mo for unlimited + voice + custom skills.
Would love feedback from the HN community, especially on the prompt engineering approach. What optimizations do you find yourself doing repeatedly?