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What applications can add a general autocomplete feature to all text fields in MacOS?
There're text expanders, like the built-in one and TextExpander, but they don't suggest things while typing and do not learn from the previous input.
iOS has both of these features, but I didn't find similar apps for MacOS.
Speaking only from my experience with iOS 7, the device saves any words you enter but don't autocorrect into your "Keyboard dictionary". The logic is that if you didn't want to correct it, it is a word that you have used and may use again.
I did a basic test. I typed "Swisslapse" into Messages but did not send. After a while I typed "Swiss" and it came up in autocomplete. I confirmed it came up in Notes too. To verify it wasn't Apple app specific I typed a new word into Avocado and it also showed up as a completion suggestion in Notes.
You can clear out your keyboard dictionary by going into Settings.app, General > Reset > Reset Keyboard Dictionary. This answer shows the path to the cache and you could theoretically remove just the offending words using a third-party tool to access and modify the file.
As for preventing new words from being learnt, I would speculate that disabling Auto-Correction would do the trick in iOS 7. Even though "Swisslapse" is an autocomplete suggestion now, it still shows up as an invalid word so it is not interacting with the spell check dictionary. iOS 8 may have more fine grained settings but you have to assume that the predictive keyboard is learning from everything you type and may have to just disable it.
To your question on iMessages, Apple is adamant that they cannot read your messages in transit as they are encrypted on the sender's device only to be read on the receiver's device(s). I would doubt that Apple saves the message contents on device if you delete it there. I haven't tested, but I would doubt they also scan incoming messages for words to autocorrect, though they have started scanning them for predictive text responses. (E.g., "Pizza or Chinese?" generates Pizza and Chinese as the first two predictive responses.)
No, this is not currently possible using Siri. If on iOS 12 a Shortcut can be made by downloading the Shortcuts app from the App Store.
You can then make this Shortcut:
You can format the date and time as you wish. You can record a phrase for Siri to copy this to the clipboard. After this you’ll need to manually paste it in the note.
Images from https://discussions.apple.com/thread/250089354
Best Answer
This has been possible for some time on the Mac OS (since 10.6), just hidden. In almost any text field or app you are typing text into you can hit
F5orOption-Escto bring up the equivalent of the iOS autocomplete list. This is different than the auto spellchecking system built into the Mac.This is similar to the answer given by @Greenonline, but works in almost any app that was developed using Apple compliant text fields. Just as an FYI, the Firefox web browser is an example of an app that DOES NOT comply with this, as well as many web based Javascript text editors that watch for special key inputs (like the ones found on this web site).
If the auto spellchecking is NOT turned on for your system for some reason you can enable it by going to:
menu -> System Preferences.. -> Keyboard -> Text taband checkingCorrect Spelling Automaticallyto on.If you are looking for an alternative to the built in functionality, then you could look at BBAutoComplete as an alternative.
It was created years ago as a free plugin for BBEdit (no longer needed since version 9 on has autocomplete built in). But the plugin can be used with any scriptable application including Word and TextWrangler.
If you are looking for a writing app specifically then I would look at Scrivener.
The cool thing about Scrivener's autocomplete is that it lets you set up separate autocomplete list for each project. This comes from the fact that it was designed for writers working on projects that might need to have specially created autocompletes for fictional characters or locations that aren't in a standard autocomplete system.
I hope this helps!