# HappyLens — Straighten artwork photos. > Local photo cleanup tool for straightening and enhancing artwork and document images. (iPhone/iPad app by 常坤 赵.) - Source: https://appshunter.io/ios/app/happylens/id6762107901 (this page in markdown: same URL + `.md`) - Developer: [常坤 赵](https://appshunter.io/developer/1738354161) - Category: Photo & Video, Productivity - Price: $0.99 - Age rating: 4+ - Requires: iOS 17.0 · 3 MB - Languages: Chinese (Simplified, China), American English - Released: 2026-06-12 - Data updated: 2026-09-12 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/happylens/id6762107901/reviews.md ## What is HappyLens? Straighten artwork, homework, notes, and document photos. Clean the background, preserve paper texture, and save a new photo. All processing stays on your device. Description Happy Lens is a lightweight local photo cleanup tool for artwork, homework, handwritten pages, notes, and document photos. When you take a quick photo of a paper sheet or artwork, the image is often tilted, uneven, shadowed, or surrounded by a messy background. Some scanner apps also process images too heavily, losing color, paper texture, and real brush or pencil details. Happy Lens focuses on one photo at a time, making the cleanup flow simple and fast. Choose a photo from your library, and Happy Lens will detect the main paper or artwork area, crop the edges, and correct perspective so the result looks more straight and natural. If automatic detection is not perfect, you can manually drag the four corners to adjust the frame. Key features: Detect artwork or document edges automatically Adjust the four-corner frame by hand Correct perspective for tilted photos Artwork mode to preserve texture, color, and brush details Ink Wash mode for soft ink tones and paper highlights Document mode for cleaner pages and clearer lines Fine-tune brightness, contrast, and background cleanup Press and hold to compare with the original photo Export results as new photos without replacing the original Happy Lens does not require an account and does not rely on cloud processing. Your image processing stays on your device, and your photos are not uploaded to a server. Great for: Children’s drawings, crafts, homework, and practice sheets Classroom handouts, paper notices, handwritten notes, and sketches Artwork, ink wash, calligraphy, and document photos taken at an angle Turning a quick photo into a cleaner image for saving or sharing Happy Lens is not a complex scanning, OCR, or file management app. It is a quiet, focused tool for straightening one photo, cleaning the background, preserving the original feel, and saving the result back to Photos. ## Key features - Automatic edge detection - Manual corner adjustment - Perspective correction - Artwork texture preservation - Ink Wash mode - Document mode - Brightness and contrast fine-tuning ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/happylens/id6762107901/reviews.md ### 5/5 — 若多张图片同步纠正 自动纠正 并额外可手动纠正 *2026-08-27* 可用。还需完善。 ## Frequently asked questions about HappyLens ### What is HappyLens used for? HappyLens is a photo editing tool designed to straighten tilted photos of artwork, documents, homework, and notes. It helps clean up messy backgrounds and preserve the original texture and colors of the subject. ### Does HappyLens require an account? No, HappyLens does not require an account to use. All image processing is done locally on your device, meaning your photos are not uploaded to any servers. ### How much does HappyLens cost? HappyLens is a paid application priced at $0.99. There are no in-app purchases or subscriptions required after the initial purchase. ### What devices is HappyLens available on? HappyLens is available for iPhone and iPad devices. It is designed for users who need a simple, focused tool for photo cleanup on their Apple mobile devices. ### Can HappyLens automatically detect document edges? Yes, HappyLens can automatically detect the edges of artwork or document photos. If the automatic detection isn't perfect, you can manually adjust the four corners to fine-tune the frame. ### Does HappyLens preserve paper texture? Yes, HappyLens has an 'Artwork mode' specifically designed to preserve paper texture, color, and details like brush or pencil marks. It aims to maintain the original feel of the artwork or document. ### How often is HappyLens updated? The latest version of HappyLens is 1.0.1, which was last updated on August 24, 2026. This indicates a recent update, suggesting ongoing support and potential for future improvements. ### Is HappyLens suitable for children? HappyLens has an age rating of 4+, making it suitable for younger users. Its simple interface and focus on straightening and cleaning photos of artwork and homework align well with educational and creative uses for children. ## Version history (last 2 releases) ### 1.0.1 — 2026-08-24 Improved automatic cropping for unusual aspect ratios Enhanced image processing to better preserve brushwork and paper texture Faster previews and smoother editing Bug fixes and stability improvements ### 1.0 — 2026-06-11 No release notes. ## More apps by 常坤 赵 - [TimeRecorder](https://appshunter.io/ios/app/timerecorder/id6499407309) - [Just Lists](https://appshunter.io/ios/app/just-lists/id6742526943) - [VoiceWriter](https://appshunter.io/ios/app/voicewriter/id6762107815) All apps by 常坤 赵: https://appshunter.io/developer/1738354161 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-12.*