Standard Check
Fix grammar, spelling, clarity, and unnatural wording in one pass.
On-demand AI keyboard for iPhone
Make the message clearer. Keep it yours.
Checker fixes grammar, rewrites tone, shortens messages, and translates text inside supported iPhone apps. Nothing runs until you choose an action.
Free to download · Requires iOS 17.6 or later
On demandNo background checking
Inside your keyboardNo separate editor
5 interface languagesEnglish plus four more
Free downloadOptional Pro limits
How it works
One message in. A better version out.
Checker does not watch everything you type. You bring in the text, choose what should change, and review the result.
- 1
Bring in the text
Use Read from Input or Use Copied Text inside the keyboard.
- 2
Choose the job
Check grammar, change tone, shorten, paraphrase, list, or translate.
- 3
Review and use it
Keep the result only when it still sounds like you.
What Checker does
Useful actions, not an AI control panel
The keyboard stays focused on the writing tasks people repeat every day.
Tone
Make text friendly, formal, casual, polite, or flirty.
Shorter
Remove filler while keeping the point and the original meaning.
Paraphrase
Say the same thing with cleaner wording and a new structure.
Make a List
Turn rough notes into a clean bulleted list.
Translate
Translate a message without leaving the app where you need it.
A real use case
Fix the sentence without flattening it
Standard Check should make the message easier to understand, not turn it into corporate copy.
Hey I wanted ask if you free meet tomorrow?
Hi! I wanted to ask if you’re free to meet tomorrow.
Where it fits
Keep Apple’s keyboard. Open Checker when the sentence matters.
Best for everyday typing
Fast autocorrection, predictions, and deep iOS integration.
Best for deliberate edits
Whole-message correction, tone changes, rewriting, and translation when you request them.
Privacy without vague promises
Full Access deserves a clear explanation
Online AI actions need network access. Checker starts processing only after you choose an action.
You start every request
Typing alone does not trigger a grammar check, rewrite, or translation.
Submitted text goes online
The text you choose is sent for processing so the AI result can return.
Read the details
The privacy policy explains usage data and how personal text is handled.
Privacy PolicyApp Store reviews
What people say across three storefronts
Six recent 5-star reviews from all over the world, translated into English.
★★★★★I like it
“Very beautiful.”
★★★★★Recommended app!
“Useful for messaging in multiple languages. It corrects and translates sentences accurately, and the design is beautiful and intuitive.”
★★★★★Very convenient
“I use it often and it paraphrases text well. Is it possible to add a question-and-answer feature to the keyboard?”
★★★★★Great at correcting mistakes
“I liked it, very convenient! I never thought an app like this could be so easy to use.”
★★★★★100% worth it
“Writing in a foreign language always made me anxious, even though I knew it fairly well, because I was afraid of not being understood. Not anymore. Thank you!”
★★★★★Perfect
“Exactly what I was looking for. It makes writing in any language easier and is very easy to use. Writing without being afraid of mistakes has become much easier.”
Five focused guides
Answers before you install
Technical explanations and honest comparisons, with links to primary sources.
AI keyboard for iPhone
How it works, why it needs Full Access, and where iOS limits it.
Apple Autocorrect vs Checker
What each tool does well and when to use both.
How to fix grammar on iPhone
Autocorrect, Writing Tools, Grammarly, ChatGPT, and Checker compared.
Checker vs Grammarly
A direct comparison of workflow, features, privacy, and cost.
AI keyboard privacy
What Full Access changes and what iOS still blocks.
FAQ
What people should know first
Does Checker work in every iPhone app?
It works where iOS and the app allow third-party keyboards. Secure fields, phone pad fields, and apps that block keyboard extensions use the system keyboard instead.
Does Checker run while I type?
No. You bring text into Checker and choose an action before anything is processed.
Why does Checker need Full Access?
Full Access provides the network capability required for online grammar checks, rewrites, and translations.
Is personal text stored?
The Checker Privacy Policy states that personal text is not stored on its servers.
Is Checker free?
Checker is free to download and includes limited AI checks. Optional Pro purchases provide higher limits and support longer text.
Checker for iPhone