Happier PDF vs China Key
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Happier PDF
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When you submit PDFs to your government or bank (for marriage proof, loan etc.), they usually have a PDF file size limit. You cannot submit PDFs big than 5MB (for example). - This app allows you to create PDFs from photos and existing PDFs. - It can merge PDFs. - It optimizes the final PDF file size for you, so that you won't hit PDF file size limit. - While you create a PDF, this app shows the current PDF file size to you, so that you know how big the PDF currently is.
China Key
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Stay connected with your shipments in real-time! The ChinaKey App lets you monitor your orders from start to finish. Receive instant updates on shipment status, estimated delivery times, and more—all from the convenience of your mobile device. With a user-friendly interface and reliable notifications, you’ll never lose sight of your packages again. Download the ChinaKey App today and experience shipping like never before!
Screenshots
Verdict
The clearest difference is in-app purchases: China Key at none against Happier PDF's 1. China Key also leads on iOS requirement (13.0 vs 16.0). Happier PDF's advantage is update cadence (every 3 days vs every 11 months). On price, ads 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. Happier PDF sells 1 one-off in-app purchase. China Key asks for nothing beyond the download.
Happier PDF ships an update every 3 days, China Key every 11 months. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.
| Parameter | Happier PDF | China Key |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days — better | Every 11 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 28 MB |
| Age rating | 4+ | +17 |
| Developer | Thi Hong Chau Le | MEGABEE SAL |
In-app purchases
Happier PDF
- Export PDF without limitation$1.99
China Key
No in-app purchases
