Best AI Keyboard Apps for iPhone in 2026

"AI keyboard" covers more ground than it used to. Some apps replace your entire system keyboard and rewrite what you type inline. Others stay closer to traditional grammar checking. Some are bundled inside a broader writing suite that includes a browser extension and a web editor, with the keyboard as one piece of a larger product. Picking the right one depends on which of those you actually need.

What counts as an AI keyboard

On iPhone, this means a custom keyboard extension you enable in Settings, which then replaces the default keyboard inside apps like Messages, Mail, and Slack. Because it needs to read and, in some cases, send your text to a service for rewriting, iOS requires granting it "Full Access." That permission is standard for any keyboard that does more than basic typing, not specific to any one app.

Grammar-focused keyboards

The most established category is grammar and spelling correction that goes beyond what iOS's built-in autocorrect handles. Grammarly's keyboard is the best-known product here — it checks spelling, grammar, and basic clarity issues as you type, and flags or corrects them inline. This category is strongest at catching mechanical errors: agreement mistakes, punctuation, and word choice. It's less built around changing the tone or structure of a message to fit a specific situation.

Keyboards bundled inside a broader writing suite

Several AI writing companies offer a keyboard as one entry point into a larger product that also includes a desktop app, a browser extension, and a web-based editor. The keyboard version of these tools is often a lighter subset of what the full suite can do, since heavier features like long-form drafting or document analysis don't translate well to a phone keyboard. These are a reasonable choice if you already use the same company's tools elsewhere and want consistency across devices.

Rewrite-focused keyboards

This category, which QKeyboard belongs to, is built around rewriting what you've already typed to match a tone or format, rather than just correcting errors in it. You type a rough draft in your own words, select it, and ask for a version that's more professional, more concise, more direct, or matches whatever tone the message calls for.

QKeyboard's specific approach includes a set of built-in modes — Professional, Concise, Friendly, Direct, and Urgent among them — plus custom modes you define yourself for a specific recurring format or voice. It also supports using your own API key, which raises the free daily rewrite limit from 20 to 100 and lets you choose the underlying model. See how this compares to Apple's own tools in QKeyboard vs. Apple's Writing Tools.

System-level writing tools

It's also worth noting that iOS itself includes some rewriting capability built into the system, available across apps without installing anything extra. These system tools cover general proofreading and rewriting but don't offer the kind of named, reusable modes or custom instructions that a dedicated keyboard app does.

How to choose

• Mainly worried about typos and grammar mistakes: a grammar-focused keyboard is the most direct fit.
• Already paying for a broader writing suite and want the same tool on your phone: the bundled keyboard from that suite makes sense.
• Want to change how a message sounds, not just fix what's technically wrong with it: a rewrite-focused keyboard is built for this.
• Send the same kind of message often and want a consistent, reusable format: look for custom mode support specifically, since not every rewrite keyboard offers it.

Trying QKeyboard

QKeyboard's free plan includes 20 AI rewrites a day (100 with your own API key) and up to 5 active custom modes. Pro removes the daily limit for $1.49/month or $9.99/year, and a one-time $9.99 Lifetime Pro option is also available. Full details are on the pricing page.