What is Grammarly AI?

Grammarly AI is the artificial-intelligence layer Grammarly added on top of its traditional grammar checker in 2024-2025. It rewrites tone, generates drafts, suggests sentence improvements, and is available on Grammarly's web app, Word, Chrome extension, and the Grammarly Keyboard for iPhone (premium tier). The free Grammarly Keyboard still only does basic grammar correction — Grammarly AI features are paid.

What's the best Grammarly AI alternative for iPhone?

KeyAI is the best Grammarly AI alternative for iPhone in 2026 because it ships 10+ AI writing tools (tone change, paraphrase, translate, ask AI, generate replies, grammar correction) in 55+ languages — not just English — for $39.99/year. Grammarly Premium is $144/year and only works in English. Apple Intelligence Writing Tools is free on iPhone 15 Pro+ for English writers.

Is Grammarly AI free on iPhone?

No. The Grammarly Keyboard's basic grammar correction is free, but Grammarly AI features (tone change, generative AI, sentence rewrites) require Grammarly Premium at $12/month or $144/year. Free alternatives: Apple Intelligence Writing Tools (iPhone 15 Pro+), KeyAI 3-day free trial, or the limited free tier of CleverType.

How is Grammarly AI different from ChatGPT on iPhone?

ChatGPT is a separate app — you switch out of whatever you're typing in, paste, copy, switch back. Grammarly AI works inside Grammarly's keyboard (or web app) so it can rewrite the text you've already written. The closest experience to ChatGPT-inside-the-keyboard on iOS is KeyAI, which uses OpenAI's GPT models for its AI features.

Does Grammarly AI work in 55+ languages?

No — Grammarly AI works in English only. For multilingual writing on iPhone, you need an alternative like KeyAI (55+ languages), CleverType (~30), or Apple Intelligence Writing Tools (English + a growing list, depending on iPhone model).

Can I use Grammarly AI inside iMessage and WhatsApp?

Yes, if you install the Grammarly Keyboard and switch to it via the globe icon. The Grammarly Keyboard works in every iOS app (Messages, WhatsApp, Mail, Notes, Slack), but the AI features (Grammarly AI) are gated to Grammarly Premium. KeyAI offers the same in-keyboard AI flow at $39.99/year vs Grammarly Premium's $144/year.

What is the cheapest alternative to Grammarly AI?

Apple Intelligence Writing Tools — free on iPhone 15 Pro and newer, English-focused, includes proofreading, rewriting, summarizing, and tone presets. For older iPhones or multilingual writers, KeyAI at $39.99/year (or $59.99 lifetime) is dramatically cheaper than Grammarly Premium ($144/year).

Does Grammarly AI replace ChatGPT?

For polishing existing drafts — mostly yes. For long-form brainstorms, research conversations, or generating new content from scratch, ChatGPT is still better. Grammarly AI is editing-focused; ChatGPT is generation-focused. KeyAI sits in the middle — both editing and on-keyboard ask-AI for short generation tasks.

Is Grammarly AI safe to use for work writing?

Grammarly publishes its data-handling practices and is used by many enterprises. iOS automatically blocks third-party keyboards from password and credit-card fields. For highly sensitive enterprise content, check your company's BYOD and AI-use policies. The same applies to every Grammarly AI alternative — KeyAI, CleverType, TypeAI all only send text on tap, never silently.

Why are people searching for Grammarly AI alternatives?

Three main reasons: 1) Grammarly Premium price ($144/year) — alternatives are $30-60/year. 2) Grammarly is English-only — multilingual writers need broader language support. 3) Grammarly AI is editing-focused; people want a tool that also generates replies, translates, and answers questions — which an AI keyboard like KeyAI does.

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Grammarly AI Alternatives for iPhone (2026 — Tested)

May 19, 2026

TL;DR — Grammarly AI is good at one job in one language. The best alternatives for iPhone in 2026 are: Apple Intelligence Writing Tools (free, iPhone 15 Pro+, English-focused), KeyAI (55+ languages, 10+ AI tools, $39.99/year — or $59.99 lifetime), and CleverType (similar to KeyAI, no lifetime option). Grammarly Premium is $144/year; the alternatives below cover the same use cases for less and in more languages.

Download on the App Store

What Grammarly AI actually is

Grammarly added an “AI” layer on top of its long-standing grammar checker over 2024-2025. The branding is now confusing — there’s:

Grammarly Free — the original grammar checker. Catches typos and basic grammar issues in English. Free.
Grammarly Premium — adds tone suggestions, clarity rewrites, and the Grammarly AI features. $12/month or $144/year.
Grammarly Keyboard for iPhone — the free version + premium gates inside the iOS keyboard.
Grammarly AI — the marketing umbrella for the generative-AI features (tone, rewrite, generative draft, ideas).

For iPhone users specifically, the question that matters: is Grammarly Premium worth $144/year, or is there a better alternative?

For most people in 2026, the answer is no — there are alternatives that cover more, in more languages, for less.

The 5 best Grammarly AI alternatives for iPhone in 2026

We tested each as a daily-driver keyboard for 14 days. Ranking by total value (features × language coverage × price):

1. KeyAI — best overall Grammarly AI alternative

Languages: 55+. Price: $39.99/year, $59.99 lifetime. Trial: 3 days, no card. Works in: every iOS app.

KeyAI ships 10+ AI tools inside the iPhone keyboard:

Grammar correction (in 60+ languages, not just English)
Tone changer with 8 presets — vs Grammarly’s 4
Paraphrase / rewrite
Translate 55+ languages on tap
Ask AI (ChatGPT-style queries in any text field)
Generate replies
Continue text
Find synonyms
Rewrite for social/email
Auto-paste

Why it beats Grammarly AI:

55+ languages vs English-only.
$39.99/year vs $144/year. Or $59.99 lifetime — pay once, never again.
Works without an account (Grammarly requires one).
All AI features available in the 3-day free trial — no card required.

The one trade-off: KeyAI uses OpenAI’s API under the hood (like most of this category), so text is sent to OpenAI when you tap an AI feature. KeyAI’s privacy policy: text is only sent on-tap, never silently. Full privacy breakdown.

Side-by-side: KeyAI vs Grammarly Keyboard.

Try KeyAI free for 3 days →

2. Apple Intelligence Writing Tools — best free Grammarly AI alternative

Languages: English + growing list. Price: Free. Trial: N/A. Requires: iPhone 15 Pro / 16 / M-iPad.

Apple’s native Writing Tools (iOS 18+) include Rewrite, Proofread, Summarize, and tone shift — most of what Grammarly AI does, free, built into iOS.

Where it wins:

Free, no subscription, no trial expiration.
On-device processing for most tasks (Private Cloud Compute for the rest) — strongest privacy story in the category.
Native, snappy, works in every system text field.

Where it loses to Grammarly AI:

Only on iPhone 15 Pro and newer (and M-chip iPads). Older iPhones don’t get it.
English-focused (other languages improving in 2026).
No translation in Writing Tools.
Fewer tone presets than dedicated keyboards.

For English-only writers on supported devices, try this first. Detailed: KeyAI vs Apple Intelligence.

3. CleverType — closest direct Grammarly AI competitor

Languages: ~30. Price: $39.99/year. Trial: 3 days. Works in: every iOS app.

CleverType is the next-closest full AI keyboard. ~7 AI tools, 20+ language support for translation, polished interface. The differences from KeyAI: fewer tools (~7 vs 10+), fewer language layouts (20+ vs 60+), no lifetime option.

If you want a full Grammarly AI alternative and lifetime isn’t a factor, CleverType is fine.

4. TypeAI — privacy-first Grammarly alternative

Languages: ~30. Price: $39.99/year. Trial: 3 days.

TypeAI emphasizes on-device processing where possible. Solid English grammar + paraphrasing, thinner feature set than KeyAI/CleverType, but a real privacy-first angle for users who don’t trust cloud AI.

5. Notion AI / Jasper / Copy.ai — context: these are NOT keyboards

For completeness — these are dedicated AI writing platforms that compete with Grammarly AI on the desktop, but they’re not iOS keyboards. You can’t use them inside iMessage, WhatsApp, or Mail without copy-pasting. For mobile-first AI writing, the keyboard form-factor wins.

Quick comparison table

Feature	KeyAI	Apple Intelligence	Grammarly Premium	CleverType	TypeAI
Languages	55+	English+	English only	~30	~30
AI tone presets	8	3	4	5	4
Translation in keyboard	✅	❌	❌	✅	✅
Ask AI inside keyboard	✅	❌	❌	✅	✅
Generate replies	✅	❌	partial	✅	✅
Works on older iPhone	✅	❌ (15 Pro+)	✅	✅	✅
Price/year	$39.99	Free	$144	$39.99	$39.99
Lifetime option	$59.99	N/A	❌	❌	❌
Free trial	3 days, no card	N/A	7 days, card req	3 days	3 days

When Grammarly AI is still the right choice

Honest about where Grammarly wins:

You only write in English and you write a LOT of long-form (essays, articles, reports, theses).
You use Grammarly’s Word and Google Docs integrations heavily and want consistency between desktop and iPhone.
Your employer pays for Grammarly Business — you already have it.
You want plagiarism checking and citation tools — Grammarly Premium includes these; AI keyboards don’t.

For those use cases, Grammarly AI is fine. For most everyday iPhone writing — emails, messages, social posts, multilingual chat — the alternatives below are better-fit and cheaper.

How to switch from Grammarly to a Grammarly AI alternative

The migration is straightforward:

Install the alternative keyboard from the App Store. (KeyAI link.)
Settings → General → Keyboard → Keyboards → Add New Keyboard — add the new keyboard.
Tap the new keyboard’s name, toggle Allow Full Access on. (Same step Grammarly required.)
Optionally remove the Grammarly Keyboard from the active list once you’ve decided to switch.
Long-press the globe icon (🌐) in any app to switch keyboards.

Full step-by-step with all the gotchas: How to Add an AI Keyboard to iPhone.

Common questions when switching from Grammarly

Will I lose my Grammarly account history? Your Grammarly account, dictionary, and saved snippets stay in Grammarly. The alternative keyboard is a separate product with its own (much simpler) settings.

Can I use both at once? Technically yes — you can have multiple keyboards installed and switch between them via the globe icon. In practice most people pick one daily-driver to keep flow smooth.

Will the alternative catch the same grammar mistakes as Grammarly? For modern LLM-based grammar checkers (KeyAI, CleverType, Apple Intelligence), yes — they catch the same errors and often handle context better than Grammarly’s older rule-based engine. Grammarly’s specific advantage was their rules library; in 2026, LLMs catch more.

What about plagiarism checking? Grammarly Premium includes it; AI keyboards don’t. For students or researchers who need plagiarism scanning, keep Grammarly Premium or use a separate tool (Turnitin, Quetext).

The cost math

Three years of writing tools on iPhone:

Option	3-year cost	Languages	AI features
Grammarly Premium	$432	English	Yes (premium gate)
KeyAI yearly	$120	55+	Yes (10+ tools)
KeyAI lifetime	$60 (once)	55+	Yes (10+ tools)
Apple Intelligence	$0	English+	Yes (limited)
CleverType yearly	$120	~30	Yes (~7 tools)

For most people, Grammarly Premium is the most expensive option in the category — and not the most capable.

So which Grammarly AI alternative should I install?

A 30-second decision:

iPhone 15 Pro / 16 / M-iPad, English only → Apple Intelligence Writing Tools. Free.
Multilingual writing, any iPhone, want full AI toolkit → KeyAI. $39.99/year or $59.99 lifetime.
Privacy-first, English only → TypeAI.
Already paid for Grammarly Premium and use the desktop Word integration heavily → Keep Grammarly; add Apple Intelligence on iPhone as bonus.

Full ranking of every AI keyboard tested: 10 Best AI Keyboards for iPhone in 2026.

Try KeyAI free for 3 days — no card required →