The best Grammarly alternative for Mac in 2026

Grammarly vs Lyra at a glance

Why people look for a Grammarly alternative

The privacy problem

Grammarly is a cloud service. What you type in your email, Slack, WhatsApp or Word document is sent to Grammarly's servers to be analysed and suggestions sent back. That's not a secret — it's how the product is architected, and it's set out in their privacy policy, which is worth reading if this matters to you.

For plenty of people that's a fine trade. For anyone writing about clients, patients, legal matters, finances, or anything genuinely personal, it's a hard stop — often one their employer decided for them.

Lyra runs a language model on your Mac. Your everyday typing is processed on-device — it never reaches a server at all. Cloud features are optional and Pro-gated, and Strict Local-Only mode disables all network use, so the guarantee can be made absolute with one switch. Turn the Wi-Fi off and everyday writing keeps working exactly the same. Here's exactly what goes where.

The tone-flattening problem

Grammarly gives you broadly the same rewrite regardless of who's on the other end. Your DM to a co-founder gets the same treatment as your email to a client. "Make it more professional" produces the same neutral output either way.

That's structural, not a missing feature. A cloud model working from the text alone has no notion of the specific person you're writing to.

Lyra takes a different route. Each time you accept a rewrite, it's saved locally as an exemplar keyed to who you were writing to. Over a few weeks, messages to your co-founder start reading noticeably differently from messages to your boss — because Lyra has picked up that you already write to them differently. There's nothing to configure and no tone to pick. It happens as you use the app.

The interruption problem

Grammarly's Premium upsell is persistent by design: dismiss a suggestion you didn't ask for and another prompt is rarely far behind. If you're trying to concentrate on the thing you're actually writing, that adds up.

Lyra shows a small pill next to your cursor when there's something worth changing. Tab accepts it, ignoring it dismisses it. That's the entire interface — no "unlock Premium", no upgrade banners. Free tier or paid, the app doesn't interrupt you.

What Grammarly still does better

Being straight about it, there are places Grammarly wins and it'd be silly to pretend otherwise:

• Deep grammar checking. Grammarly has well over a decade of grammar rule engineering behind it. Lyra is focused on rewriting and tone, not comprehensive grammar coaching.
• Windows, web and mobile. Grammarly runs more or less everywhere. Lyra is Apple Silicon Macs only — M1 or later, macOS 14 and up.
• Team and enterprise plans. Grammarly has admin, billing and style-guide features for organisations that Lyra doesn't ship.
• Long-form documents. If you're writing a book, dissertation or long report, Grammarly's document editor suits that workflow better than an inline rewrite pill does.

If you're on Windows, working on a manuscript, or you need team management, Grammarly is still the right tool and no alternative is needed.

What Lyra does better

• Private by default. Your everyday writing never leaves your Mac. Cloud-grade polish only for the hard cases — Pro only, and only when it counts.
• Works in every macOS app. Slack, iMessage, WhatsApp, Teams, Mail, browsers, Notion, Notes — anywhere there's a text field. Grammarly's coverage thins out once you leave the browser and Word.
• Learns your voice per recipient. A cloud tool can't do this, because it doesn't have local context on who you're writing to.
• No popups or upsells. Lyra is designed to disappear when you don't need it.
• Native menu bar app. Not a browser extension, not an Electron wrapper.
• Cheaper. $6.99/month against roughly $12 for Grammarly Premium — and the free tier is genuinely usable at 500 rewrites a month.

What switching actually looks like

The honest version: you don't have to switch on day one, and you probably shouldn't. Grammarly and Lyra sit in different places — Grammarly as a browser extension and system-wide helper, Lyra as a menu bar app watching the text field you're focused on — so running both for a week costs you nothing and tells you more than any comparison table can.

Setup is a download and an accessibility permission, which macOS requires for any app that can read and replace text in other apps. There's no account, no email, and no card. On first launch Lyra pulls down its model once, and from then on your everyday writing needs no connection.

What you'll notice in the first hour is the shape of the interaction. Grammarly flags things — a coloured underline, a card, a suggestion you accept or dismiss. Lyra waits for you to stop typing and offers one cleaner version of the whole line. You take it with Tab or keep typing and it vanishes. It's a different mental model: not a proofreader looking over your shoulder, more a second draft that shows up unprompted.

What you'll notice after a fortnight is the per-recipient learning. Early on the rewrites are competent but generic. As the local corpus fills with the rewrites you accepted, they start sounding like you writing to that particular person — shorter and blunter in Slack, more constructed in a client email. That's the part a cloud tool structurally can't reproduce, and it's the reason most people who move off Grammarly on Mac end up staying moved.

How Lyra works technically

Under the hood, Lyra uses llama.cpp to run a language model directly on your Mac's Metal GPU and Neural Engine. Model choice adapts to your machine's memory: Macs under 20 GB of RAM get Qwen3-1.7B (Q4_K_M, about 1.1 GB), Macs with 20 GB and up get Gemma 3n E2B (Q4_K_M, about 3 GB) for richer rewrites.

Your accepted rewrites go into a local SQLite database keyed by recipient. When you next write to that person, Lyra pulls the most relevant past examples and passes them to the model as few-shot examples.

The design follows one rule: your everyday writing never leaves your Mac — and a single switch makes that absolute. The model is local, the corpus is local, Strict Local-Only mode disables all network use, and the optional analytics — which you can switch off — carry anonymous event counts only, never your text. How Lyra uses the cloud sets out the rest.

FAQ

Is Lyra actually free?

Yes. 500 rewrites a month, no time limit, and no signup to try it. Pro is $6.99/month or $39.99/year for unlimited rewrites.

How is Lyra different from Apple's Writing Tools?

Apple's Writing Tools work best inside Apple's own apps — Mail, Notes, Messages. Lyra works in every macOS app, including third-party ones like Slack, WhatsApp, Teams, browsers and Notion. Lyra also learns per recipient over time, which Apple's Writing Tools don't do.

How is Lyra different from using ChatGPT for rewrites?

ChatGPT means copy-pasting between apps, and every request goes to OpenAI's servers. Lyra appears right at your cursor in whatever app you're already typing in, and the rewrite happens on your Mac.

Does it work offline?

Your everyday writing does. Once the model has downloaded on first launch — roughly 1 GB to 3 GB depending on your Mac's memory — the on-device path works with the Wi-Fi off. The optional cloud extras pause while you're offline, and are disabled entirely in Strict Local-Only mode.

Can I try Lyra without giving up Grammarly?

Yes. They don't conflict. Plenty of people run both for a week and see which one they actually reach for.

Which Macs does Lyra support?

Apple Silicon (M1 or later) running macOS 14 Sonoma or newer. Intel Macs aren't supported.

What about Windows or iPhone?

Not currently. Lyra is Mac-first because on-device inference is only reliably fast enough on Apple Silicon right now.