Rectfly

Shuangpin with typo correction

Only for iPhone

Free

iPhone

Rectfly finds the word you meant when you hit a wrong key, and can correct a whole sentence. Seven shuangpin layouts, plus English. Rectfly is a shuangpin keyboard for iPhone, with Xiaohe (Flypy) as the default layout. When you hit a wrong key, miss one or press an extra one, it uses touch position, the lexicon and context to offer the word you meant. It can also correct a whole sentence at once. Whole-sentence correction • Download the Wanxiang grammar model in the app (about 420 MB, Wi-Fi recommended). The keyboard reads it offline and phrases long sentences more accurately. • On our 30-sentence shuangpin test set, the first choice for the whole sentence is right about 97% of the time with the grammar model and about 57% without it. • Typing works without the model. You can download, update or delete it in the app at any time. Shuangpin layouts • Xiaohe (Flypy), Ziranma, Microsoft, Sogou, Ziguang, Intelligent ABC and Pinyin Jiajia. Choose one under Pinyin Layout in the app. Every layout gets the same typo correction. Chinese • Simplified Chinese output. Add Traditional Chinese for Taiwan or Hong Kong under Languages in the app. Taiwan output can also convert regional words (软件 → 軟體). • Word packs such as place names, personal names, poetry vocabulary, medical terms and typhoon names, each with its own switch. • Classical poetry suggestions. • Custom phrases: type a code and your phrase appears first in the candidate bar. • Import a Rime user dictionary text export. The words stay on this iPhone. English • Tap the gear key to switch between Chinese and English, or touch and hold it to pick one. • Typo correction and completion, auto-capitalization, double-space for period and emoji suggestions. • Offensive words are blocked by default; you can turn this off in Settings. Editing • Touch and hold the space bar, then slide to move the cursor. • Touch and hold Delete, then swipe up to clear what you just typed. • Touch and hold or swipe up on a letter key for numbers and symbols. • A number pad and a searchable emoji panel. • Tap the logo in the top-left corner for the tool panel with clipboard and keyboard settings. • Clipboard (off by default): paste a new copy with one tap, or slide across a history entry to paste part of it. History stays on the device. Appearance • Keyboard themes: set background, key and text colors for light and dark separately, or turn off key backgrounds. • Accent color: Gold, Carolina Blue, Wolfpack Red or any color you pick. • Replace the logo in the top-left corner with your own photo, cropped to fit. • Adjustable keyboard height and candidate size. • Adjustable haptic strength, key sounds and key popups. Privacy • The keyboard extension does not use the network. Correction, suggestions and personal learning run on your iPhone. • Settings can sync between your devices through your own iCloud account, and you can turn this off. Typed text, clipboard and learning records are not synced. • On first launch the app asks whether you want to help improve Rectfly. If you agree, it compares candidates on your iPhone and sends summary statistics after 500 comparisons. The statistics are counts only, with no typed text, selected words or pinyin. You can turn this off in Settings at any time. • No ads, no third-party SDKs, no account or sign-in. Full Access Basic typing works without Full Access. Allow Full Access for Rectfly in iOS Settings so the keyboard can read settings from the app, the downloaded grammar model and imported words, and to use haptics and the clipboard. Requires iOS 26 or later.

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The developer, YUCHEN LIU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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Information

Seller
YUCHEN LIU
Size
183.2 MB
Category
Utilities
Compatibility
Requires iOS 26.0 or later.
  • iPhone
    Requires iOS 26.0 or later.
Languages
English and 2 more
  • English, Simplified Chinese, Traditional Chinese
Age Rating
4+
Copyright
© 2026 Yuchen Liu
  • Developer Website
  • Privacy Policy