Paste a private email into Grammarly and something quiet happens: your words leave your computer. They travel to Grammarly’s servers in a data center, get analyzed there, and the suggestions travel back. It works, it’s fast, and for most people it’s invisible. But the sentence you were embarrassed about (the raise you’re asking for, the message to your doctor, the thing you can’t figure out how to phrase) spent a moment on someone else’s machine to get fixed.
That’s not a scandal. It’s an architecture. Many writing tools are built this way, because running good language AI in the cloud is far easier than running it on a phone. This post is about tools that can keep the editing step on your device. That distinction matters: optional sync, purchases, model downloads, exports, and links can still use a connection even when the AI itself is local.
”Sends it to the cloud” is how these tools are built, not an accusation
Cloud processing is the normal, mainstream design. To turn your rough sentence into a clean one, a server somewhere has to read it. Reputable tools protect that trip: encryption in transit, and clear policies about what they do and don’t keep. Those are real promises, and they’re worth something.
But it’s still a promise about text you handed over, not text you kept. Two things follow from the architecture, no matter how good the company’s intentions:
- Your writing has to leave your device to get better. No connection, no help.
- You usually need an account, which ties what you wrote to who you are.
The alternative isn’t “trust a better promise.” It’s to not send the text in the first place.
The scorecard
Here’s where each tool processed writing when checked in July 2026. Competitor products and policies change, so verify the current plan before using any tool with sensitive text. Several offered deletion commitments, and one can be self-hosted.
| Tool | Where the AI runs | Account | Works offline |
|---|---|---|---|
| Better Writing | On a compatible iPhone or iPad (Apple’s model or a downloaded local model) | Not required | Yes, after model setup |
| Apple Writing Tools | On-device; harder tasks to Apple’s Private Cloud Compute | Apple ID (device) | On-device tasks, yes |
| Grammarly | Remote servers | Required | No |
| ProWritingAid | Remote servers | Required | No |
| QuillBot | Remote servers | Optional (no sign-up for basic use) | No |
| Wordtune | Remote servers | Recommended | No |
| LanguageTool | Remote servers, or self-host it yourself | Cloud: yes | Only if you self-host |
Better Writing keeps its editing path on-device after compatible model setup. Apple’s Writing Tools uses an Apple-managed mix of on-device processing and, for some requests, Private Cloud Compute. LanguageTool can be local if you are willing to operate the necessary setup yourself.
Where the cloud tools win
I’m not going to pretend Better Writing beats these on everything. It doesn’t.
- Grammarly offered broad reach across Windows, Mac, browsers, Word, Google Docs, iPhone, and Android.
- ProWritingAid emphasized long-form craft, including pacing, repetition, and sentence-length reports for novelists.
- LanguageTool is open source and covers 30-plus languages, and on privacy you can self-host it, which makes it as private as anything on this list.
- QuillBot and Wordtune offered browser-based rewriting across common phones and computers.
- Apple’s Writing Tools were included on compatible Apple Intelligence devices and available across supported system text fields.
Breadth, maturity, platform coverage, price: the cloud tools and Apple’s built-in tools win those fairly.
Where Better Writing is different
Two places. First, against the cloud tools: Better Writing uses Apple’s built-in model when it is available or a compatible downloaded model on other supported hardware. After setup, English editing works with no signal and no Studio AM AI server processes the writing. There is no Studio AM account.
Second, against Apple’s own Writing Tools: Better Writing is a dedicated editor and coach. It shows a word-level diff, remembers style preferences, tracks recurring patterns, and offers Shorter, More formal, Simpler, More natural, and Elevate refinements. It can also turn user-supplied notes into a draft, draft a reply from a screenshot transcript you confirm, answer questions grounded in saved writing, read text aloud, and open from the Share extension, App Shortcuts, or widgets.
The limits: it requires iOS 26 or iPadOS 26 and a compatible model runtime. Apple’s built-in model is used where available. Other supported devices may use a lighter download of about 0.9 GB with at least 3.5 GB of physical memory, or an enhanced download of about 2.6 GB with at least 5.5 GB. Devices below the downloaded-model memory floor need Apple’s compatible runtime. Compatibility is based on the active runtime and memory, not a promise about an iPhone generation. In Rewrite mode, Better Writing is instructed to preserve meaning and reject unsupported details, but every AI suggestion still needs review.
Better Writing has no permanent free tier for fresh writing work. Eligible new subscribers may receive a 3-day trial on either plan; US prices are $4.99 per month or $29.99 per year. The retired lifetime purchase is restore-only. If access ends, saved sessions remain readable, searchable, copyable, individually deletable, and exportable as Markdown or versioned JSON; fresh edits, drafts, replies, coaching, practice, reminders, and model work require active access.
Its privacy boundary is specific rather than absolute: saved writing and correction-review progress stay local unless you enable optional private iCloud sync; model and optional voice downloads and purchases need a connection; exports and Share actions go where you choose; and a declined Ask Your Writing question goes to DuckDuckGo only after you tap Search the web. The app sends no writing to a Studio AM AI server. You’ll find the full details on its app page.
The best thing a writing tool can do with your private words is never receive them.