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Presidio is a free library you host and wire up yourself. Hushbridge is a ready product that protects prompts on your device.
Open-source library: build it yourself
Presidio started at Microsoft. Its repository now says it has completed a move to an independent, community-governed project under the Data Privacy Stack organization on GitHub. It stays open source under the MIT license, and the old Microsoft links redirect. You install it, host it and call it from your own code. It fits engineering teams that want full control and can maintain the integration.
Local protection layer
Hushbridge works where people already use AI. On your device it swaps details for placeholders such as [PERSON_1] and shows you what the AI will get. After you review it, the placeholder version goes to the AI. Real values come back on your device. It fits people who want this working in ChatGPT or Claude today, and developers who want an SDK with restore built in.
| Question | Presidio | Hushbridge |
|---|---|---|
| What it protects | Whatever your code passes to it. It ships detectors for items such as credit card numbers and US Social Security numbers, plus name detection through an NLP model. You can add your own detectors. | Names, identifiers, addresses, secrets and anything on your own "always protect" list, in text you type or paste. |
| Where processing happens | Wherever you run it: your own servers, containers or data pipelines. | On your device. |
| Where original values are stored | Wherever your code keeps them. With the encrypt operator, the original comes back from the encrypted value and your key. | In a swap table that stays on your device. |
| Restore in replies | Possible, if you build it. Its deanonymizers revert operations such as encryption. Wiring that into AI replies is your work. | Yes. Real values return on your device in supported replies. |
| How you use it | A Python library, or REST services in Docker. You call the analyzer, then the anonymizer, inside your own app. | A browser extension for ChatGPT, Claude, Gemini, Copilot and Perplexity, a web workspace, or the SDK and local proxy in your own code. |
| Deployment | Self-hosted, from Python or PySpark through Docker to Kubernetes. Docker images now publish to the GitHub Container Registry. | Extension version 0.1.1 installs manually in Chrome with "Load unpacked". Workspace and billing run on tightlipai.com during the move to the new name. |
| Pricing | Free. MIT license. You pay for your own hosting and engineering time. | USD 0.05 per credit. Top-ups from USD 100. USD 20 free credit on sign-up (to be reconfirmed before launch). One credit covers each started block of 8,000 tokens. |
Presidio facts come from its repository and docs. We did not benchmark it for this page.