Alternatives
Gmail Smart Compose vs Nextline
Nextline is not a Gmail feature. It predicts the rest of your sentence in any supported Mac app — Apple Mail, Outlook, Slack, Notes — not just the Gmail compose box. Smart Compose already does its one job well. This page is about what happens the moment you close that tab.
Past where Smart Compose can reach
A Slack thread, a shared doc, an email in Apple Mail instead of Gmail — Smart Compose was never in any of them. The grey text is Nextline's suggestion — press Tab to take it, or keep typing straight through it.
The demo cycles through Gmail, Slack, Claude, ChatGPT, and Notion, showing Nextline predicting the rest of each sentence as it is typed.
Which one you should use
Stay with Gmail Smart Compose if
- You write almost entirely inside Gmail, on the web or in the mobile app.
- You want suggestions personalized to your own Gmail writing history.
- You don't want to install anything beyond your browser.
- You write in Spanish, French, Italian, or Portuguese, where Smart Compose documents support and Nextline doesn't publish a language list.
Try Nextline if
- You also write in Apple Mail, Outlook, Slack, Notes, or a browser field outside Gmail.
- You want the same kind of suggestion to follow you between apps instead of stopping at Gmail's edge.
- You'd rather a local model than a signed-in Google Account feature.
Side by side
Compared on the things that actually differ.
| Nextline | Gmail Smart Compose | |
|---|---|---|
| How you use it | Type, and the rest of the line appears ahead of the cursor | Type in Gmail; grey text appears, press Tab to accept |
| Where it works | Any supported macOS text field | Gmail only — web, Android, and iOS apps |
| Personalization | Not account-based; no writing-history profile | Optional — can tailor suggestions to your own writing style |
| Account required | No | Yes — a Google Account, with smart features turned on |
| Where processing happens | On your Mac, by a local model | Google's servers |
| Language support | No documented language list | English, Spanish, French, Italian, and Portuguese |
| Platforms | macOS | Any device with Gmail — web, Android, iOS, Windows |
| Price | Free | Free, built into Gmail |
Nextline is not affiliated with Gmail Smart Compose. Details checked on 21 July 2026 against their own site. Pricing moves — tell us if this has gone stale.
Smart Compose already does its one job well
Nothing here is a knock on Smart Compose. It predicts a plausible next phrase while you’re mid-sentence in Gmail, it’s trained on a genuinely enormous amount of email, and Google ships it to every Gmail user for free. If you write almost entirely inside Gmail, it’s already doing the job Nextline exists to do, and there’s no reason to add a second Mac app on top of a feature that already works. Our own guide to turning it on says as much.
The boundary is the whole story. Smart Compose is scoped to one product. The moment your writing crosses into Apple Mail, Slack, a Notion doc, or a browser tab that isn’t Gmail, the suggestions stop — not because they got worse, but because they were never there to begin with.
One app, and then it stops
This isn’t a design flaw. Gmail-only is the product Google built, and it’s a reasonable place to draw the line for a Gmail feature. But most people don’t write in only one place. A typical day moves between email, a Slack thread, a shared doc, and a handful of browser text fields, and Smart Compose has a say in exactly one of those.
Nextline takes the other bet. Instead of being built into one app’s compose box, it watches whatever text field currently has your cursor and predicts the rest of the line there, using the same accessibility APIs that power VoiceOver rather than a connection to any single product. Press Tab to take the suggestion, or keep typing straight through it. It doesn’t know or care whether you’re in Gmail, Mail, or a Slack DM — which is the whole trade.
That trade runs the other way too. Smart Compose can personalize its suggestions to your own writing history inside your Google Account — a familiar sign-off, a phrase you reach for often — because it has your Gmail activity to learn from. Nextline has no account and no history to draw on; it predicts from the text already on the page, not from who’s typing it. If Help me write or a full generated draft is closer to what you’re after, that’s a different job than either of these do.
Where Nextline won’t help
- It doesn’t run on Gmail’s mobile app. Nextline is a Mac app with nothing on iOS or Android, so on your phone Smart Compose keeps working exactly as it always has and Nextline has no presence at all.
- It doesn’t personalize to your writing history. No account, no learned sign-offs, no memory of how you usually phrase something — Smart Compose’s personalization has no Nextline equivalent.
- It doesn’t generate full drafts. Neither does Smart Compose, but if what you actually want is Gmail writing an email from a prompt, that’s a different tool’s job, not this one’s.
- It’s macOS only. Smart Compose works anywhere Gmail does — Windows, Android, iPhone, any browser. Nextline covers exactly one of those platforms.
What it does instead is carry the same kind of suggestion to the rest of your Mac — the apps Smart Compose was never going to reach, because it was built for one of them.
Questions people actually ask
- Is Nextline a Gmail Smart Compose alternative?
- For Gmail specifically, only if you want the same kind of suggestion somewhere Smart Compose can't follow you. Inside Gmail itself, Smart Compose already does this well, and Nextline doesn't try to outdo it there — the two can simply run side by side, since Nextline is supported in Gmail on the web too.
- Can I use Nextline and Smart Compose together in Gmail?
- Yes. Nextline doesn't disable or replace Gmail's own suggestions, and both can be active in the same compose window. In practice you'll rarely notice any overlap, since only one system's suggestion shows at a time.
- Does Nextline work on Gmail's mobile app?
- No. Nextline is a Mac app with no iOS or Android version, so it has nothing to offer on your phone, where Smart Compose keeps working exactly as it always has.
- Does Nextline personalize suggestions the way Smart Compose does?
- No, and we're not going to pretend otherwise. Smart Compose can tailor suggestions to your own writing history once personalization is turned on. Nextline predicts from the text and context already in front of it, not from an account-level writing profile.
- Why would I need autocomplete outside Gmail at all?
- Only if you write somewhere else. If Gmail is the only place you draft email, Smart Compose is already free, already on, and this page has nothing to add. The gap only shows up once you switch to Apple Mail, Slack, or a document and the suggestions stop.
Try it in the apps you already use
Runs on your Mac. Your text stays there — nothing sent anywhere.