Grammar Checker for Mobile: Android and iOS Keyboard Alternatives
June 27, 2026
We write more on our phones than ever before. Emails, texts, social media posts, Slack messages, dating app conversations — a huge portion of our daily writing happens on a small touchscreen. Yet most mobile keyboards only offer basic autocorrect and predictive text, catching typos but missing the kinds of grammar mistakes that can change the meaning of a sentence or make you look careless.
If you've ever sent a message with "your" instead of "you're," or realized too late that a sentence didn't actually make sense, you know the problem. Desktop users have browser extensions and writing tools to catch these errors. But what about mobile?
The good news is that real grammar checking on mobile is now possible — and you don't have to sacrifice your privacy to get it. In this guide, we'll compare the best grammar checking options available for Android and iOS in 2026, including keyboard apps, built-in features, and app-specific tools.
Why Mobile Grammar Checking Is Hard
Grammar checking on mobile is fundamentally different from desktop, and the desktop model simply doesn't translate. Here's why:
- No browser extensions — Mobile browsers like Safari and Chrome on iOS and Android don't support the same extension ecosystem as their desktop counterparts. You can't just install a Grammarly or Typlx Chrome extension on your phone's browser.
- App sandboxing — Mobile operating systems isolate apps from each other for security. A grammar tool running in one app can't access what you're typing in another app. There's no system-wide text overlay like you might find on desktop.
- The keyboard is the platform — On mobile, the keyboard is the one piece of software that has access to your text input across every app. This makes custom keyboard apps the only viable way to provide grammar checking everywhere you type.
- Limited processing power — Phones have less computational headroom than laptops and desktops, which makes running complex language models locally more challenging.
- Privacy concerns are amplified — A keyboard app sees everything you type: passwords, private messages, financial details. Sending all of that to a cloud server raises serious privacy questions.
The conclusion is clear: if you want grammar checking that works across all your apps on mobile, a custom keyboard app is the way to do it. Let's look at the options available in 2026.
Option 1: Typlx Mobile Keyboard (Android and iOS)
What It Does
The Typlx keyboard replaces your default keyboard and adds a grammar suggestion bar above the key layout. As you type, Typlx analyzes your sentences and surfaces grammar corrections in real time. When a suggestion appears, you simply tap it to accept the fix — no switching apps, no copy-pasting into a separate tool.
- Works in every app — Because it's a keyboard, Typlx provides grammar checking wherever you type: Messages, Gmail, WhatsApp, Slack, LinkedIn, Twitter, and any other app with a text field.
- Local processing — Typlx runs a compact language model directly on your device. Your text never leaves your phone. No cloud servers, no data collection, no network requests.
- No account required — Install the app, enable the keyboard, and start typing. There's no sign-up, no login, and no subscription.
- Free and open-source — Typlx is MIT-licensed. You can inspect the source code, verify that it doesn't phone home, and even contribute improvements.
Setting Up Typlx on Android
- Download Typlx from the Google Play Store.
- Open the Typlx app and tap "Enable Keyboard."
- In Android Settings, go to System → Languages & input → On-screen keyboard, and toggle Typlx on.
- Return to the Typlx app and tap "Select Keyboard" to set Typlx as your active keyboard.
- Open any app and start typing — grammar suggestions will appear in the suggestion bar above the keyboard.
Setting Up Typlx on iOS
- Download Typlx from the App Store.
- Go to Settings → General → Keyboard → Keyboards → Add New Keyboard, and select Typlx.
- Open any app with a text field and tap the globe icon on your keyboard to switch to Typlx.
- Start typing — grammar corrections will appear in the suggestion bar.
A note about iOS "Allow Full Access" permissions: When you add a third-party keyboard on iOS, the system may prompt you to "Allow Full Access." This permission lets a keyboard app send data over the network. Typlx does not require Full Access to function because all processing happens on-device. You can leave Full Access disabled and Typlx will work exactly the same — this is a meaningful privacy advantage over keyboards that require network access to function.
To switch between Typlx and your default keyboard at any time, tap the globe icon in the bottom-left corner of the keyboard.
Option 2: Grammarly Keyboard (Android and iOS)
Grammarly offers a mobile keyboard app for both Android and iOS that brings its well-known grammar checking capabilities to your phone. The keyboard underlines errors and provides suggested corrections as you type.
- Platform: Android, iOS
- Cost: Free tier with basic grammar checks; Premium ($12/month) for advanced suggestions, tone detection, and full-sentence rewrites
- Processing: Cloud-based — your text is sent to Grammarly's servers for analysis
Grammarly's cloud processing means you get access to powerful language models without taxing your phone's hardware. However, this comes with a trade-off: every word you type is transmitted to Grammarly's servers. For casual writing this may be acceptable, but if you regularly type sensitive information — passwords, financial details, private conversations — it's worth considering whether you're comfortable with that data leaving your device. Grammarly also requires an account to use, even on the free tier.
Option 3: Google's Gboard (Grammar Suggestions Feature)
- Platform: Android (built-in on most devices), iOS
- Processing: Cloud-based — requires an internet connection for grammar suggestions
Google's Gboard keyboard includes a grammar suggestions feature that can catch some common errors. It's more limited than a dedicated grammar tool — it handles subject-verb agreement, common confusions like "there/their/they're," and a few other patterns — but it has the advantage of being already installed on most Android phones. You don't need to download anything new.
To enable grammar suggestions in Gboard, open Gboard settings → Text correction → Grammar correction and toggle it on. Note that this feature requires an active internet connection since corrections are processed on Google's servers.
Option 4: App-Specific Grammar Checking
Some individual apps include their own grammar checking features that work only within that app:
- Google Docs — The Google Docs mobile app includes grammar suggestions powered by Google's language models. Corrections appear as blue underlines in your document. This works well for document editing but doesn't help you in any other app.
- Microsoft Word — The Word and Outlook mobile apps include Microsoft Editor, which checks grammar and offers style suggestions. Like Google Docs, these corrections are limited to Microsoft's own apps.
- Grammarly's own apps — Grammarly offers a standalone writing app where you can compose text with full grammar checking, then copy it to another app. This works but adds friction to your workflow.
App-specific grammar checking is useful if you do most of your writing in one particular app, but it won't help you in your messaging apps, email clients, or social media. For comprehensive coverage, a keyboard-based solution is still the better approach.
Comparing Mobile Grammar Checking Options
Here's how the main options stack up:
| Option | Works in All Apps | Local Processing | Free | No Account |
|---|---|---|---|---|
| Typlx Keyboard | ✅ | ✅ | ✅ | ✅ |
| Grammarly Keyboard | ✅ | ❌ Cloud | ✅ Limited | ❌ |
| Gboard Grammar | ✅ | ❌ Cloud | ✅ | ✅ (Google account) |
| Google Docs | ❌ Docs only | ❌ Cloud | ✅ | ❌ |
| Microsoft Word | ❌ Word/Outlook only | ❌ Cloud | ✅ Limited | ❌ |
Using Desktop and Mobile Together
Many people write on both their computer and their phone throughout the day. Typlx is designed to provide a consistent grammar checking experience across both platforms:
- Chrome extension for desktop — Install the Typlx Chrome extension to get grammar checking in your browser on any website.
- Mobile keyboard for Android and iOS — Install the Typlx keyboard app to get grammar checking in every app on your phone.
- Both use local processing — Whether you're on desktop or mobile, your text stays on your device. No cloud sync, no server-side processing.
- Both are free — No premium tiers, no feature gates, no subscriptions on either platform.
- Same foundation — Both the extension and the keyboard app are built on the same on-device language model, so you get consistent correction quality across platforms.
This means you don't have to remember which tool you're using or worry about different behavior between devices. The grammar checking experience is the same whether you're drafting an email on your laptop or replying to a message on your phone.
Tips for Mobile Writing Quality
Beyond installing a grammar checker, here are a few habits that can improve the quality of your mobile writing:
- Accept suggestions selectively — Grammar checkers aren't perfect. Read each suggestion before accepting it, especially for informal writing where intentional rule-breaking (fragments, slang, casual tone) is part of your style.
- Slow down for important messages — When you're writing something that matters — a work email, a message to a client, a social media post for your business — take an extra moment to review before hitting send. A grammar checker helps, but your own judgment is the final filter.
- Use keyboard switching deliberately — If you have multiple keyboards installed, use the globe icon to switch to Typlx when you want grammar checking and back to your default keyboard for quick casual messages where speed matters more than polish.
- Consider privacy per context — Think about what you're typing and which keyboard is active. If you're entering a password or sensitive personal information, be aware of whether your active keyboard sends data to the cloud. With Typlx, this isn't a concern since nothing leaves your device.
The Bottom Line
Mobile grammar checking has come a long way. You no longer have to choose between convenience and quality, or between functionality and privacy. Keyboard apps have made it possible to get real grammar corrections everywhere you type on your phone, without the friction of copying text to a separate tool.
If privacy matters to you — and if you want a grammar checker that works in every app, requires no account, and costs nothing — Typlx is worth trying. It's open-source, runs entirely on your device, and is available for both Android and iOS as well as a Chrome extension for desktop.
Typlx is free and open-source. Available as a Chrome extension and keyboard app for Android and iOS.
Last updated: June 2026