Apple's Grey List: 100,000 Phrases Your iPhone Keyboard Won't Suggest
Your iPhone isn't autocorrecting by mistake: there's a list of words and phrases it refuses to suggest, and nobody told you. A researcher pulled it out of the keyboard's own files, and now we know how many entries it holds and how it behaves.
What the Researcher Found
Derik Kauffman, founder of Blacklight, a startup that hunts for errors in scientific papers, presented the finding in San Francisco: Apple keeps an unpublished multilingual grey list of tens of thousands of words and phrases that the iOS keyboard will not autocomplete or let you swipe. Reuters broke the story on Friday, November 6, 2026, and the tech press followed the same day.
How He Extracted the Lists
The method was not reverse engineering of a closed system but something simpler: download the latest language asset from Apple's servers and keep the phrases the keyboard does not predict. To decode the lists he combined OpenAI's Codex and Anthropic's Claude Code. The code and data were published, so the experiment can be repeated.
Where That Data Lives
English, Chinese and Cantonese are built into iOS 27.0. The rest arrives through Apple's language downloads served in October 2026. This is not a cloud filter or a setting: it is keyboard data, part of the system.
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Grey List Versus Blacklist
The difference is half the story. A blacklist blocks input; a grey list only blocks help. You can still type, letter by letter, but you lose prediction and swiping, which is exactly where the speed comes from. That is why the accurate headline is "won't suggest", not "censored".
What the User Can and Cannot Do
Typing one of those phrases letter by letter always works. When swiping (Apple calls that gesture QuickPath), the keyboard does not produce them and usually substitutes another word. Suggestions can be dismissed, and Apple stresses that users can type whatever they want.
Why There Is No Toggle in Settings
Language data is part of the operating system. No privacy setting or keyboard option disables the list, and no third-party app can do it either: alternative keyboards ship their own lexicon and their own rules. If your product relied on autocomplete for a particular field, that is the warning.
The Numbers, Without Mixing Them Up
This is where most outlets get tangled, and there is no contradiction: it is the same list measured two ways.
4,513 English Phrases
That is the size of the list built into the system, alongside Chinese and Cantonese.
Over 100,000 Across All Languages
Apple keeps lists for 27 more languages and scripts. Reuters added them all up and counted more than 100,000 words and phrases. Around 30 languages in total, with Russian phrases about Putin and troop deployments among the examples the press published.
Why It's a Lower Bound
Entries that could not be decoded or spelled out were left out of the count. What was published is a floor, not an exact inventory, and it is worth saying so before quoting the figures as final.
What's Inside the List
The predictable part is there: slurs, sex and drugs. The interesting part is the rest. There are political slogans such as "Dictator Trump" and "Sleepy Joe", names of public figures and historical events. In other words, the rule is not only "offensive": what the company considers politically sensitive also makes the cut.
The Problem of Defining "Sensitive" in 28 Languages
A term that is offensive in one language can be a medical term in another. Keeping consistent rules across dozens of scripts is the underlying problem behind this list, and it is an open problem, not an excuse.
What Apple Says
The company told Reuters that the keyboard is designed to avoid potentially inappropriate or offensive suggestions, that it declined to explain why any specific phrase is on the list, and that users can type whatever they want and dismiss suggestions. What it does not publish is what matters most for auditing the criteria: who decides, under which rule, and how often it is reviewed.
What It Means If You Build Software
The practical consequence is short: don't rely on autocomplete for critical data. If a form expects a street name, a diagnosis or a specific term, test the field by typing and by swiping, and in every language if your product is multilingual. Our posts on data privacy in the age of AI and on apps without personal data follow the same line: the system decides before you do.
How to Check It Yourself
Type one of the known phrases letter by letter and watch whether it shows up in the suggestions. Then try to swipe it. The gap between the two behaviours is the grey list at work, and it is more noticeable on iOS 27 than on earlier versions.
Conclusion
The keyboard is an interface with its own judgement, and that judgement ships inside the system. Knowing what it decides saves you two things: arguments without data and dangerous dependencies in your forms. The list blocks nothing, but it changes the experience of typing, and in a product that counts too.
If you care about how these invisible decisions get made in the software you use every day, keep reading the technology news and guides on this blog.
