Promptello - AI Prompt Enhancer

Turn rough ideas into clear, structured AI prompts — right in your browser. Works for any task. Private, on-device, no sign-up.

Great answers start with great prompts. Promptello turns a rough, plain-English idea — a question, an email, a plan, a piece of code — into a clear, well-structured "master prompt" you can paste into any AI chat. No prompt-engineering knowledge required. It lives in your browser's side panel, right next to where you already use AI. Describe what you want however roughly, and Promptello assembles a structured prompt using proven frameworks — then drops it straight into ChatGPT, Claude, Gemini, or Perplexity with one click. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FOR ANY TASK — NOT JUST CODE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Promptello opens in "Everyday Assistant" mode by default, so it's useful from the first second whether you're writing an email, planning a trip, drafting a report, doing research, or shipping a feature. Pick from focused modes when you want them — Writing, Marketing, Email, Product, Research, Customer Support, Tutoring, and a strong Vibe Coding / Dev mode for builders. • Basic view: a clean idea → enhance → send path. Nothing to learn. • Advanced view: context attachments, guided refinement, framework details, and a built-in test suite — there when you want depth, hidden when you don't. Your choice is remembered. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PRIVATE BY DESIGN — YOUR IDEAS STAY ON YOUR MACHINE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Promptello is built privacy-first: • No account. No sign-up. No tracking. • Your ideas, captured pages, and history are stored locally in your browser (chrome.storage.local) — not on our servers, because we don't have any. • Optional on-device AI: when Chrome's built-in Gemini Nano is available, the "Quick Enhance" polish runs entirely on your device. When it isn't, Promptello falls back to local, rule-based assembly. Either way, nothing is sent to a third-party server by the extension. • Page capture is opt-in and per-site: Promptello only reads a page when you click "Capture page," and asks for access to that site at that moment — no standing access to your browsing. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ KNOW EXACTLY WHAT'S IN YOUR PROMPT ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Most prompt helpers are a black box. Promptello shows its work: • A live preview of the exact prompt that will be sent — fully editable before you use it. • A "Why this prompt?" explainer that breaks down the chosen framework and what each section does, in plain English, plus a short Prompting 101. • Per-source usage readout: when you capture a page, Promptello tells you exactly how many characters of it actually made it into the prompt, so nothing is silently dropped. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ RICH CONTEXT, NOT JUST TEXT ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ • Capture the page you're on as context (relevance-aware — it pulls the parts that matter, not just the top of the page). Everything you attach shows up as a "chip" so you can see and manage exactly what's feeding your prompt. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ONE-CLICK SEND ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ "Enhance & Send" drops the finished prompt straight into the composer of your active AI chat — ChatGPT, Claude, Gemini, or Perplexity — so you review and hit send yourself. It never auto-submits, and never overwrites text you've already typed without asking. If a site ever blocks insertion, Promptello copies the prompt to your clipboard automatically so you're never stuck. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ HOW IT WORKS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1. Open the side panel and type your idea. 2. Optionally attach context — capture the page you're on — and answer a few quick guided questions. 3. Promptello assembles a structured master prompt and shows a live, editable preview. 4. Copy it, or click "Enhance & Send" to drop it into your AI chat. Review and send. Built on proven prompt frameworks (RISEN, CRAFT, ROLE, CO-STAR, RTF), chosen automatically based on what you're doing. Requires Chrome 138 or later. On-device AI (Gemini Nano) is optional — Promptello works without it. No account. No cloud. No catch. Just better prompts.