Gemma vs OmniPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gemma
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App for the remote control of Gemma Lights. Our Lights are integrated into furniture that is useful, like bedside tables, or bookshelfs or sideboards.
OmniPDF
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OmniPDF helps you quickly find PDF problems and fix them with combined tools and batch processing. Built for people who handle many files and don’t want to jump around in a full PDF editor: inspect the files, run a guided plan, review the results, and export when everything looks right. 【Smart Inspection】 • Checks common issues such as incorrect page orientation, blank pages, oversized files, password protection, leftover annotations, editable form fields, and file metadata • Provides clear, plain-language results explaining what each issue means and why it may matter 【Combined Fixes】 • Automatically builds a processing plan based on inspection results • Runs multiple steps in one go • Compare files before and after processing inside the app 【Batch Processing】 • Process multiple PDFs at once • Merge, split, compress, rotate, delete pages, extract pages, and more • Useful for contracts, application materials, reports, and scanned documents 【Everyday Tools】 • Merge, split, compress, and rotate PDFs • Delete, extract, and reorder pages • Encrypt or decrypt PDF files • Remove private metadata and leftover annotations • Redact sensitive text and information • Scan documents and convert photos to PDF • Add signatures, watermarks, and page numbers Inspect files, process them, preview the results, and compare before and after—all inside the app. OmniPDF — review the result first, then take it with you. Privacy Policy: https://zzthhj.github.io/OmniPDF/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Gemma at none against OmniPDF's 3. Gemma also leads on iOS requirement (15.6 vs 18.6). On price, update cadence, 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. OmniPDF sells 3 in-app purchases, starting at $3.99 per month. Gemma asks for nothing beyond the download.
Gemma ships an update every 3 weeks, OmniPDF every 6 weeks. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.
| Parameter | Gemma | OmniPDF |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 31 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Gemma-Design | zhentao zhang |
In-app purchases
Gemma
No in-app purchases
OmniPDF
- OmniPDF Pro Monthly$3.991 Month
- OmniPDF Pro Yearly$29.991 Year
- OmniPDF Pro Lifetime$59.99






