Proselens
Readability lens for writers
USD 0.99 · Designed for iPad. Not verified for macOS.
Proselens is a writing lens that helps you say more with less. Paste or type any text — an email, an essay, a chapter, a cover letter — and Proselens reads it the way a sharp editor would, then marks up the lines worth a second look. Everything happens on your device. No sign-in, no cloud, no tracking.
Pay once. No subscription. No in-app purchases. It's yours.
A LIVE CLARITY SCORE
At the top of the editor sits a single number from 0 to 100. It blends a real readability index with how densely your writing leans on hard sentences, passive voice, adverbs, complex words, and filler. Tighten a line and watch the score climb. It's the fastest feedback loop in your writing.
COLOR-CODED HIGHLIGHTS, AS YOU TYPE
Proselens paints your text inline, the moment you stop typing:
• Very hard sentence — very long or tangled; break it up.
• Hard sentence — long or dense; consider splitting it.
• Passive voice — "to be" plus a past participle; active voice is clearer.
• Adverb — an -ly adverb a stronger verb could replace.
• Weasel word — vague qualifiers and filler that add nothing.
• Complex word — a long word with a simpler everyday alternative.
Tap any highlight, or any chip in the legend, to jump straight to it. Step through every issue from the keyboard bar. Turn off any check you don't care about and the counts and score update instantly.
THE NUMBERS THAT MATTER
• Flesch Reading Ease and Flesch–Kincaid grade level
• Reading time at a speed you set
• Words, sentences, paragraphs, and characters
• Average words per sentence and syllables per word
A clean stats sheet lays it all out, with a plain-English read on what your score means and how to lift it.
A LIBRARY FOR YOUR DRAFTS
Save what you're working on and come back to it later. Each draft shows its clarity at a glance. Search across everything. Copy or share the checked text in a tap.
PRIVATE BY DESIGN
Proselens uses Apple's on-device language tools to do all of its analysis right on your iPhone or iPad. There is no networking in the app at all. Your words never leave your device — not to us, not to anyone. It works fully offline, on every device, with nothing to download.
BUILT FOR REAL WRITING
• Adjustable thresholds for what counts as a long sentence
• Adjustable reading speed for accurate reading-time estimates
• Editor text size and an optional monospaced mode for code and scripts
• Dark, focused interface designed to keep you in the words
• Full Dynamic Type and VoiceOver support
Whether you're polishing a newsletter, cutting a report down to size, or just trying to sound like yourself, Proselens is the second pair of eyes that's always with you — and always private.
Made with care by Robert Corbin.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
This update sharpens the interface: the iPad layout now uses a centered, comfortable reading width instead of stretching edge to edge, plus small display fixes. iPhone is unchanged.
The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert Corbin
- Size
- 5.2 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin

