How to Fix Grammar Mistakes Automatically While You Type on iPhone

iPhone's built-in autocorrect is good at one job: fixing typos. It swaps "teh" for "the," adds missing apostrophes, and catches obvious misspellings before you notice them. What it does not do is check whether your sentence actually makes grammatical sense.

That gap is why a message can be free of red underlines and still contain a subject-verb mismatch, a run-on sentence, or a tense that shifts halfway through. Autocorrect checks words. It does not check structure.

What autocorrect catches

• Misspelled words
• Missing or misplaced apostrophes
• Common typos from mistyped keys
• Basic capitalization at the start of a sentence

These are useful fixes, but they operate at the level of a single word. Autocorrect has no model of the sentence as a whole, so it will not flag a sentence that is grammatically broken as long as every word in it is spelled correctly.

What autocorrect misses

Three problems show up often in everyday typing and none of them trigger a spelling correction.

Subject-verb agreement. A sentence like "The reports from the client team is late" has no misspelled words, but "reports" and "is" do not agree in number.

Before: "The reports from the client team is late."

After: "The reports from the client team are late."

Run-on sentences. Typing quickly on a phone makes it easy to string two complete thoughts together without a period or conjunction.

Before: "I sent the file yesterday I haven't heard back yet I'm worried it didn't go through."

After: "I sent the file yesterday. I haven't heard back yet, and I'm worried it didn't go through."

Tense mixing. Longer messages, especially ones typed in short bursts between other tasks, can drift from past to present tense without you noticing.

Before: "We reviewed the proposal yesterday and we think it needs more detail, so we ask for another draft."

After: "We reviewed the proposal yesterday and thought it needed more detail, so we asked for another draft."

Why a rewrite pass catches what autocorrect can't

Autocorrect works letter by letter as you type. Catching grammar problems requires reading the whole sentence, understanding how the parts relate, and rebuilding it if something doesn't hold together. That's a different kind of check, and it needs to happen after a sentence is written, not while each letter lands.

QKeyboard runs this kind of pass from inside the keyboard itself. Type your message as usual, select the text, and ask for a rewrite. It reads the full sentence, not just individual words, so it can spot an agreement problem or a tense that drifts partway through, and rewrite the sentence so it holds together.

Because it works as a custom iOS keyboard, this happens inline in whatever app you're already typing in, whether that's Messages, Mail, or Slack. There's no separate app to switch to and no copy and paste involved.

When to run a grammar pass

• Before sending anything longer than a couple of sentences
• When you've been typing in short bursts and might have lost track of tense
• On messages that matter for how you come across, like a note to a manager or client

Casual one-line replies to close friends rarely need this step. A longer email or a message you're sending to someone you don't know well is worth the extra ten seconds.

Getting started

QKeyboard's free plan includes 20 AI rewrites a day, or up to 100 a day if you use your own API key. If you want a tone adjustment on top of the grammar fix, modes like Professional or Friendly apply both at once. See pricing for the full plan details.