SpendLens by boyzliberty

See token count and cost before you send your AI prompt.

Download Firefox and get the extension

About this extension

SpendLens shows token count and estimated cost in real time as you type your AI prompt — before you hit send. Works on Claude, ChatGPT, Gemini, Perplexity and more. Zero data collection, runs locally.

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Permissions and data

Required permissions:

Access your data for claude.ai
Access your data for chat.openai.com
Access your data for chatgpt.com
Access your data for gemini.google.com
Access your data for aistudio.google.com
Access your data for poe.com
Access your data for perplexity.ai

Optional permissions:

Access your data for claude.ai
Access your data for chat.openai.com
Access your data for chatgpt.com
Access your data for gemini.google.com
Access your data for aistudio.google.com
Access your data for poe.com
Access your data for perplexity.ai

Data collection:

The developer says this extension doesn't require data collection.