PDFer vs 鱼符 Yulyph
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDFer
Easily add text or image watermarks to your PDF documents. Customize watermark appearance with adjustable color and transparency. Import PDFs from other apps or your computer.
- Import PDFs from other apps
- Upload PDFs from computer
- Add text watermarks
- Add image watermarks
- Customize watermark color
- Adjust watermark transparency
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【功能】 1. 支持从其他软件导入PDF。 2.支持从电脑上传PDF到手机。 3.支持添加文字水印。 4.支持添加图片水印。 5.支持修改颜色，透明度等参数。
鱼符 Yulyph
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聿符是一款专业的图片隐写加密应用，让您可以将秘密信息安全地隐藏在普通图片中，真正做到"藏密于无形"。 【核心功能】 • 高强度加密：采用AES-256-GCM加密算法，银行级安全保护 • F5隐写算法：将加密数据嵌入图片像素，抗JPEG压缩 • 图片相框：添加精美白边相框，右下角显示专属品牌标识 • 创意模版：小红书风格模版，支持5种渐变色彩选择 【隐私保护】 • 所有操作均在设备本地完成 • 不上传任何用户数据到服务器 • 不追踪用户行为 • 开源代码，透明可查 【使用场景】 • 保护私密照片和个人信息 • 安全传递敏感信息 • 为照片添加专属水印 • 创建个性化海报图片 【支持功能】 • 支持PNG、JPG、HEIC格式 • 支持中英文界面 • 支持iPhone和iPad • 支持相册导入和文件分享 您的隐私，我们守护。
Screenshots
Verdict
The clearest difference is update cadence: 鱼符 Yulyph at weekly against PDFer's every 2 months. PDFer's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
PDFer ships an update every 2 months, 鱼符 Yulyph weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | PDFer | 鱼符 Yulyph |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 13 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | chenghui Duan | 佩珅 李 |
In-app purchases
PDFer
No in-app purchases
鱼符 Yulyph
No in-app purchases
