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Editorial Team · 2026-10-06
Grammarly vs QuillBot: Which AI Writing App to Use on a Phone
By Editorial Team · published 2026-10-06 · updated 2026-10-06
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QuillBot for most people: more free tools, a keyboard on both iPhone and Android, and a Premium plan that costs $19.99 a month against Grammarly's $29.99. Grammarly is the better pick on an iPhone if you mainly want dependable grammar and tone checks in every app, plus a dictation mic that strips out filler words. On our criteria QuillBot scores 7.1 and Grammarly 6.8, and the gap is mostly price and Android stability. Prices as of October 2026, from the US App Store.
The short answer
Install QuillBot if you rewrite things — emails that sound too blunt, paragraphs that run long, text you want in another language — and want the most you can get without paying. Install Grammarly if your main need is a reliable check for spelling, grammar and tone as you type on an iPhone, and you would use its dictation mic. On Android, QuillBot is the safer choice today.
What each one is built around
Grammarly is a checker first. Its phone app checks spelling, grammar and tone as you type in other apps and adds AI rewrites on top. On iPhone it ships its own keyboard and includes a dictation mic that removes filler words as you speak. On Android there is no Grammarly keyboard — only a floating widget that sits over Gboard or SwiftKey. Our core function score is 8.0, with 2026 reviews still reporting scrambled long texts.
QuillBot is a rewriter first. It runs as a standalone editor, as a keyboard on both iPhone and Android, and on Android also as a floating assistant over other apps. The free tier includes two rewrite modes, a grammar check, a translator and an AI Detector; eight more rewrite modes sit behind Premium. Its core function also scores 8.0.
Price and what the free tier blocks
Grammarly Premium costs $29.99 a month in the US App Store. Tone changes and clarity advice need it, and reviewers say the free rewrite allowance has shrunk — some report one free rewrite a day rather than the larger number once advertised. Its monetisation scores 5.5.
QuillBot Premium is listed at $19.99 a month or $99.99 a year in the App Store. Most modes, unlimited generation and longer limits need it, but the free tier keeps two modes, grammar, translation and the detector. Its monetisation scores 6.0.
The annual price is where they part most. QuillBot's $99.99 a year is about what three months of Grammarly's monthly plan costs.
Permissions and privacy
Both need deep access to work where you type, and both score 6.5 for privacy. Grammarly requires Full Access for its iPhone keyboard and accessibility permission on Android; audio from the dictation mic is not stored, but the iOS label lists tracking data. QuillBot needs accessibility permission on Android and keyboard permission on iOS, and its developer's help pages say inputs may feed training and personalisation.
In practice, a writing keyboard sees everything you type, including passwords if you are careless. Switch to the system keyboard for banking and sign-ins, whichever app you choose.
Where Grammarly wins
Grammarly's checks are the more dependable of the two for everyday writing, and they work in any app you type into. The iPhone dictation mic is a genuine feature QuillBot lacks: speak a message, and it comes back without the ums and the repeated words. For someone who writes work email on an iPhone and wants a second pair of eyes on tone, Grammarly does that job well. Its weak side is Android, where its ease of use scores 7.0 and performance 6.0: vanishing widgets, resetting permissions and scrambled text fill 2026 reviews, and Grammarly's own help pages carry battery fixes for Samsung and Xiaomi phones.
Where QuillBot wins
QuillBot gives more for nothing — two rewrite modes, a translator and an AI Detector free — and charges less when you pay. It has a real keyboard on Android rather than a widget, plus a floating assistant for apps where the keyboard is not convenient. Its ease of use scores 7.5 and performance 7.0, both above Grammarly's. Reviews do mention paste lag, freezes and rewrites that fail, and the Android bubble can cover buttons, but the complaints are fewer and less serious.
The same message in both
Write a short, irritated email to a supplier about a late delivery, and run it through each. Grammarly flags the commas and suggests a softer opening; the tone advice that would turn it into a polite, firm message is a Premium feature. QuillBot's free rewrite modes give you a new version of the whole email straight away, more neutral in tone, and you pick the one that sounds like you. For fixing errors, Grammarly is quicker; for changing how the message lands, QuillBot gets you there free.
Who should pick which
A student who writes essays and wants to vary their phrasing will get more from QuillBot, whose free rewrite modes and translator cover most of that without a subscription; its AI Detector is also free, which some students use to check their own drafts before handing them in. A professional who sends dozens of short messages a day from an iPhone, and cares mostly that none of them goes out with a typo or a sharp tone, is Grammarly's natural user, and the dictation mic suits someone who prefers speaking to typing.
On Android the decision is simpler. QuillBot's keyboard behaves like a keyboard; Grammarly's widget, by its reviewers' account, behaves unpredictably on Samsung and Xiaomi phones, and its own help pages contain battery fixes for them. Until that changes, an Android user should try QuillBot first.
Anyone who writes in more than one language has a further reason to choose QuillBot, since its translator is part of the free tier and sits in the same keyboard as the rewrites. Grammarly's phone app has no translator among the features its listing describes.
Bottom line
QuillBot is the better writing app for most phones: a broader free tier, a keyboard on both platforms, better stability on Android, and Premium at $19.99 a month or $99.99 a year. Grammarly is worth it on an iPhone for dependable checks and its filler-removing dictation — but at $29.99 a month, test whether the free checks are enough before paying.
