I made an interactive prompt compression demo

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Hello HN, I am Zachary, co-founder of Promptropy - the world’s first prompt compression API. Linked is a demo for our first public endpoint for context-agnostic text compression. Prompt compression is based on the idea that LLMs don’t need many of the quirks of natural language, allowing them to extract equivalent meaning from a prompt 2-20x smaller than the original one. This allows us to intelligently remove tokens from a prompt—making it nearly unreadable to a human, yet still perfectly clear to the LLM (try this by asking a model like GPT-4 to summarize a long passage vs a compressed one). Please feel free to try out the demo we linked! We would love the HN community’s feedback on what we have built and what can be better. Thank you!

Visit product View on Hacker NewsJul 22, 2025

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Indie HackersFits the IH revenue-focused audience · Missing: supports, reddit linkedin, podcasting

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AppSumoStrong fit for a featured deal · Missing: plus, platform, intuitive

52%52% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Hacker NewsStrong engagement from HN community · Strong signals: ide, io · Missing: https docs, excited, just released

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nativeThis product was originally launched on this platform.

TrustMRRLess likely to generate early MRR · Missing: mobile apps, ios, personal

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Acquire.comPre-revenue stage for this audience · Strong signals: active · Missing: arr, mrr, revenue

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2%2% predicted probability of success on BetaList, based on ML models trained on real launch data.

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