Crescent Keys vs PolyInvert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Crescent Keys
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Jumpstart your notes with: - Video-timestamped notes - Multiple tags per note Never context-switch again, with the video and your notepad in the same space.
PolyInvert
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Transform PDF documents and images into inverted color versions with just one tap. PolyInvert is the perfect tool for converting Polycam floor plans, architectural drawings, documents, and images for viewing in darkmode. PERFECT FOR POLYCAM USERS Export your Polycam floor plans directly into PolyInvert and instantly invert them. Works seamlessly with PDF, PNG, and SVG exports from Polycam. KEY FEATURES • Smart Color Inversion - Advanced algorithms optimized for each file type • Multi-Format Support - PDF, PNG, SVG, and ZIP archives • Batch Processing - Import and invert multiple files at once • One-Tap Export - Share via Messages, Mail, Files, or any app • ZIP Support - Automatically extracts and processes archive contents • Privacy First - All processing happens locally on your device • No File Size Limits - Process documents of any size • Universal App - Works on iPhone, iPad, and Mac HOW IT WORKS 1. Import your files from iCloud Drive, Files app, or directly from Polycam via the share sheet. 2. Tap "Invert All" to process all files, or invert individually 3. Export inverted files via iOS Share Sheet to save or share anywhere PRIVACY & SECURITY Your files stay private. PolyInvert processes everything locally on your device. We never upload, store, or access the content of your files. What you invert stays on your device. USE CASES • Invert Polycam floor plans to dark mode for Blackout Lighting Console • Create dark mode versions of documents • Improve contrast on architectural drawings • Invert scanned documents for easier reading • Prepare images for presentations • Process technical diagrams and schematics FREE WITH OPTIONAL AD REMOVAL PolyInvert is completely free to use with ads. Remove all ads permanently with a one-time in-app purchase that syncs across all your devices. TECHNICAL DETAILS • Supports PDF, PNG, and SVG files • Handles multi-page PDFs with ease • ZIP archive auto-extraction • Maintains original file quality • Preserves document structure and formatting • Fast processing with optimized algorithms MADE BY AMOGAFFER PolyInvert is developed by AMOGaffer with a focus on simplicity, privacy, and reliability. We're committed to creating tools that just work. REQUIREMENTS • iOS 17.0 or later • iPadOS 17.0 or later • macOS 14.0 or later (Apple Silicon) Need help? Contact us at contact@amogaffer.com Privacy Policy: https://amogaffer.com/privacy/polyinvert/
Screenshots
Verdict
The clearest difference is in-app purchases: Crescent Keys at none against PolyInvert's 1. Crescent Keys also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.0). PolyInvert's advantage is update cadence (daily vs fortnightly). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PolyInvert sells 1 one-off in-app purchase. Crescent Keys asks for nothing beyond the download.
Crescent Keys ships an update fortnightly, PolyInvert daily. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.
| Parameter | Crescent Keys | PolyInvert |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 4 MB | 8 MB |
| Age rating | 9+ | 4+ |
| Developer | Quoc Dat Nguyen | ADAM MICHAEL OGDEN |
In-app purchases
Crescent Keys
No in-app purchases
PolyInvert
- Remove Ads$2.99
Questions
Is Crescent Keys free?
Is PolyInvert free?
Do Crescent Keys or PolyInvert have ads?
Which is updated more often, Crescent Keys or PolyInvert?
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