Comparison

Gemma vs OmniPDF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gemma

Features
Read full description

App for the remote control of Gemma Lights. Our Lights are integrated into furniture that is useful, like bedside tables, or bookshelfs or sideboards.

About

OmniPDF

Features
Read full description

OmniPDF is a batch PDF processing tool. Select multiple files and use shared settings for compression, watermarks, passwords, or page organization. You can also combine several operations into a workflow to reduce repetitive processing and setup. Organize contracts, application documents, reports, and scanned files. Preview the results in the app and review changes before exporting or sharing. 【Batch Processing】 • Compress multiple PDFs with a target file size. • Find and permanently remove searchable sensitive text across multiple PDFs. • Add the same watermark or page numbering to multiple PDFs. • Set, change, or remove passwords required to open multiple files. • Check page orientation, remove blank pages, trim page margins, or adjust paper size. • Remove file metadata and annotations, or make editable content a fixed part of the page. 【Combine Multiple Steps】 • Choose several tools and set their execution order. • Combine compression, sensitive text removal, and watermarks in one workflow. • Save workflows you use frequently and reuse them later. • Review the results, then continue with other operations or export. 【A Complete PDF Toolkit】 • Merge, split, delete, extract, duplicate, and reorder pages. • Rotate and trim pages, insert pages, and replace pages. • Scan documents, turn images into PDF files, and export PDF pages as images. • Add text, annotations, signatures, date stamps, and stamps. Fill existing form fields. • Draw rectangles over areas to permanently remove sensitive content. 【Optional PDF Inspection】 • Check file size, page orientation, blank pages, password protection, annotations, form fields, and metadata. • Choose which items to process based on the inspection results. • Inspect first if needed, or choose a tool and start processing directly. Processing and result previews are available in the app. Exporting or sharing processed files requires an in-app purchase. OmniPDF — one batch of files, multiple steps, one workflow. Privacy Policy: https://zzthhj.github.io/OmniPDF/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Gemma3 screens
OmniPDF3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OmniPDF sells 3 in-app purchases, starting at $3.99 per month. Gemma asks for nothing beyond the download.

UpkeepUpdate frequency

Gemma ships an update every 3 weeks, OmniPDF every 6 weeks. The most recent releases landed on October 25, 2026 and October 22, 2026 respectively.

Scorecard2 real differences · 4 level
Gemma versus OmniPDF: the parameters behind the verdict, then further details
ParameterGemmaOmniPDF
PriceFreeFree
Update frequencyEvery 3 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better18.6
Further details — not scored
Size31 MB17 MB
Age rating4+4+
DeveloperGemma-Designzhentao zhang

In-app purchases

None

Gemma

No in-app purchases

3 purchases

OmniPDF

Subscriptions2
  • OmniPDF Pro Monthly$3.991 Month
  • OmniPDF Pro Yearly$29.991 Year
One-time1
  • OmniPDF Pro Lifetime$59.99

Questions

Is Gemma free?
Gemma is free to download, with no in-app purchases.
Is OmniPDF free?
OmniPDF is free to download, with in-app purchases available.
Do Gemma or OmniPDF have ads?
Neither Gemma nor OmniPDF shows ads.
Which is updated more often, Gemma or OmniPDF?
Gemma ships an update every 3 weeks, and OmniPDF every 6 weeks. Most recently, Gemma was updated on October 25, 2026 and OmniPDF on October 22, 2026.

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