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Estimates quota/cost impact of a prompt before it's sent to Claude.ai, with suggestions to reduce cost without losing quality. Claude Cost Optimiser Estimate the quota cost of a prompt before you send it in Claude.ai. Claude Cost Optimiser is a free, open-source Google Chrome extension that estimates how much of your Claude.ai usage quota a prompt is likely to consume before you press Send. Long conversations, multiple attachments, powerful models and high reasoning effort can dramatically increase quota usage. Until now, there has been no easy way to understand that cost before sending a message. Claude Cost Optimiser helps you make smarter decisions, reduce unnecessary quota usage, and get more value from every conversation. HOW IT WORKS When you send a message in Claude.ai using Google Chrome, the extension analyses your prompt locally within your browser before it is submitted. It considers factors including: - Prompt length - Conversation length - Attachments - Selected Claude model - Reasoning effort - Other prompt characteristics that influence quota usage It then displays an easy-to-understand estimate: - Negligible - Low - Medium - High - Very High - Extreme ...along with an approximate percentage of your available quota that the prompt is expected to consume. If a prompt looks expensive, Claude Cost Optimiser explains why and offers practical recommendations that can often reduce usage while maintaining similar output quality. Recommendations may include: - Switching to a more appropriate Claude model - Reducing reasoning effort where it provides little additional value - Splitting large requests into smaller prompts - Removing unnecessary prompt content Each recommendation includes an estimated saving so you can decide whether the trade-off is worthwhile. Nothing is changed automatically—you remain completely in control of what gets sent. PRIVACY FIRST Everything happens locally inside your browser. Your prompts, conversations and attachments are never transmitted to us, to any analytics service or to any third party. - No tracking - No advertising - No accounts - No remote processing WHAT IT DOES NOT DO Claude Cost Optimiser estimates the cost of an individual prompt. It does not: - Call Claude or any AI model to generate estimates - Consume any of your Claude usage quota - Track your remaining account quota - Replace a dedicated quota tracking tool - Instead, it helps you avoid wasting quota before each message is sent. HIGHLY RECOMMENDED For the best Claude experience, we strongly recommend pairing Claude Cost Optimiser with a Claude Usage Monitor extension. The two extensions complement each other: Claude Cost Optimiser - Estimates the cost of your next prompt - Explains why prompts are expensive - Suggests ways to reduce quota usage before sending A Claude Usage Monitor - Tracks your overall quota usage - Shows remaining quota and reset times - Helps identify long-term usage patterns Together they provide a complete quota management workflow: ✔ Know how much quota you have left. ✔ Know how much your next prompt is likely to cost. ✔ Reduce unnecessary usage before you press Send. Used together, they help you maximise every Claude subscription by combining real-time usage tracking with intelligent prompt optimisation. OPEN SOURCE The complete source code is publicly available for inspection, and contributions are welcome. DISCLAIMER Claude Cost Optimiser is an independent, unofficial Google Chrome extension for Claude.ai. It is not affiliated with, developed by, operated by or endorsed by Anthropic PBC. "Claude" is a trademark of Anthropic PBC.