Like Grammarly but for AI. Dynamically rewrite, structure, and expand your prompts directly inside ChatGPT, Claude, and Gemini for perfect outputs, every time.
Type a draft prompt below or select a template preset to see how Promptly analyzes, upgrades, and compares your prompts in real-time.
See how Promptly users are cutting down API costs and making prompt engineering 10x more efficient.
"Promptly has made my development workflow 10x more efficient. I used to waste countless API key credits and hours copy-pasting prompts back and forth to refine instructions. The real-time word diff shows me exactly what's changing instantly. It saved me a mountain of time!"
"We were spending thousands of dollars troubleshooting prompt deviations across our writing team. With Promptly's custom context variables, we inject standard guidelines dynamically. It saves **tons of money and time** on re-runs. No more generic outputs."
"The ability to bring my own Gemini API key is incredible. Promptly integrates so cleanly into my ChatGPT interface that it feels like a native feature. The visual feedback makes tweaking complex parameters satisfying and extremely fast."
Unlock the full potential of large language models with native client-side toolsets.
Promptly monitors your text fields as you compose. Click the floating sparkle action button to automatically augment structure, instructions, and target rules.
Never guess what changed. Our diff overlay highlights deleted words in red background/strikethrough and inserted improvements in neon green.
Save money on premium subscriptions. Tap into the built-in free daily tier, or hook up your own Google Gemini API key to run unlimited prompt refinements locally.
Define custom tags (e.g. [brand_voice], [formatting_rules]) in your local settings dashboard. Promptly automatically expands them inline before execution.
All prompt processing and variables are stored locally on your device storage. We never store or trace your text input logs.
Instantly boots inside ChatGPT, Claude, and Gemini. Features lightweight content scripts that don't bloat your active browser memory.