Resources
White papers
Papers on how Catchlight is built, what it protects you against and what it doesn't, and what people complain about in notes apps, published before launch so they can be checked rather than taken on trust.
The Catchlight encryption architecture
How Catchlight seals a note, where the keys live, and what the design deliberately does not protect you against. Published before launch so it can be checked rather than trusted.
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Who might read your notes, and what each of them can actually do
An adversary-by-adversary threat model: what a thief, a household member, a cloud provider, Apple, a warrant and the maker can each actually do.
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How to tell whether a notes app is actually private
Seven tests you can run on any notes app in an afternoon, what each one really probes, and Catchlight scored on the same scale.
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Protecting your notes without Advanced Data Protection
What the withdrawal of Advanced Data Protection actually cost UK iPhone users, why Notes and Reminders were two of the ten categories affected, and what is still in your hands.
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What AI features cost you in a notes app
Where a model runs decides what an AI feature costs you. On-device, confidential server compute and ordinary servers compared, with the questions to ask any notes app.
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Sync with no server and no account
How two devices agree with no server and no account, what the design gives up to get there, and the measured provider constraint it imposes.
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The one star test
What sixteen notes and task apps' one and two star reviews complain about most, which complaints are growing, and what any notes app has to get right as a result.
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