PDF Reader vs Harmonix OTC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Reader
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Your essential, all-in-one document tool. PDF Reader-sign simplifies how you manage, read, and sign all your important files on iPhone and iPad. Say goodbye to complicated software and expensive subscriptions. High-Impact Features • E-Sign Documents Instantly: Sign any PDF document, form, or contract directly on your device with your finger or stylus. Fast, secure, and legally binding. • Fill Forms Easily: Quickly fill out PDF forms and save the completed document. • Universal File Viewer: Read and open all your essential files in one place: • PDFs n eBooks: Open and read all your documents and digital books. • Office Files: View popular Microsoft Office file types: .doc, .xls, and .ppt. • Images n Web: Easily view .png, .jpg, and .html web pages. • Simple n Reliable: Designed for speed. Just tap to open any file quickly with a clean, clear interface. Download PDF Reader-sign today to simplify document viewing and sign any file instantly!
Harmonix OTC
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This app helps users manage and use their hearing aid devices more easily.
Screenshots
Verdict
The clearest difference is ads: Harmonix OTC at none against PDF Reader's shown. Harmonix OTC also leads on update cadence (every 2 days vs every 115 months) and iOS requirement (11.0 vs 14.0). On price, 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.
PDF Reader ships an update every 115 months, Harmonix OTC every 2 days. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.
| Parameter | PDF Reader | Harmonix OTC |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 115 months | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 128 MB |
| Age rating | 4+ | 17+ |
| Developer | Aishvarya Sadasivam | Huizhou Jinghao Medical Technology Co.,Ltd. |
In-app purchases
PDF Reader
No in-app purchases
Harmonix OTC
No in-app purchases
Questions
Is PDF Reader free?
Is Harmonix OTC free?
Do PDF Reader or Harmonix OTC have ads?
Which is updated more often, PDF Reader or Harmonix OTC?
Other comparisons
