Keyboard Warrior
Write to one person in text nobody else can read — through any app you already use.
Every keyboard checks whether your writing is correct. None of them let you write something only one other person can read, and none of them check whether sending it is a good idea. This one reads the draft before it goes: a card number about to land in a chat, a sentence aimed at the person rather than the problem, the reply you're writing at 2am that will read differently in the morning.
What it does
Messages nobody else can read
Agree a phrase with someone, out loud or however you already talk. You both type it in once. After that you can write to each other through any app — Messages, WhatsApp, Instagram, a comment box — and what leaves your phone is scrambled text nobody else can turn back. No accounts, and no server holding the phrase, because there is no server. Set it up with as many people as you like — each has their own phrase, and you pick who a message is for before you lock it. Reading one they sent you takes two taps: hold the message, tap Copy. That's iOS, not us — no keyboard is allowed to read another app's messages, which is also why no keyboard can read yours.
Notices what you'd want back
Card numbers and passwords about to be pasted into a message. Words aimed at someone rather than at the situation. "Per my last email," which lands sharper than anyone means it to. It says what it noticed and gets out of the way — it never tells you not to send anything, because it's your message.
On your device, always
The send check is pattern matching over the draft and the clock. No network, no model, nothing transmitted. The angriest thing you write this year is exactly the text that should never leave your phone.
It also fixes your typing
Apostrophes come back the moment a word ends. Spacing tidies itself. Autocorrect is weighted by where your thumb landed. Undo the same correction twice and it stops being made — the keyboard takes the hint.
Grammar that reads the sentence
A rule can't tell that "Their going to the store" is wrong; every word is spelled correctly. The AI tier catches it, and explains the rule with a test you can use next time instead of just asserting the fix.
House style
Hold your writing to AP or Chicago — serial commas, numbers, dash spacing, and a piece's consistency with itself. Checked on your device, free.
What leaves your device
There's a screen in the app that answers that for your actual settings rather than in general. Out of the box, spelling is checked on your phone and nothing is sent anywhere. No account, no analytics, no tracking. Passwords and secure fields are never checked at all.