Comparison

Permutation Combination vs PDF快速盖章

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

Head to head
About

Permutation Combination

Easily calculate permutations and combinations for mathematics and statistics. This tool simplifies complex calculations, helping users save time and improve accuracy in exams and studies.

Highlights
  • Permutation calculations
  • Combination calculations
  • Time-saving for exams
  • Mathematical and statistical use
  • User-friendly interface
Features
Read full description

"Permutation Combination Calculator" is an application that makes it easy to perform calculations for permutations and combinations commonly used in mathematics and statistics. By using this app, even those who are not good at mathematical calculations can easily perform calculations. The app is equipped with functions for performing permutation and combinatorial calculations. In permutation calculations, you can find the number of cases where r elements are selected from n elements. Combinatorial calculations, on the other hand, allow you to find the number of cases where r elements are selected from n elements, disregarding the order. In web-based examinations with strict time limits, reducing the time spent on calculation questions can free up time to answer other questions. By allocating your time appropriately and using the "Permutation Combination Calculator", you can take the web-based examinations efficiently and accurately.

About

PDF快速盖章

This app allows for quick and easy stamping of PDF documents and images. It supports batch processing for multi-page PDFs, offers a comprehensive stamp library with customization options, and simulates realistic stamp effects. It's designed for efficient mobile document signing and processing.

Highlights
  • Quick stamping for PDFs and images
  • Batch processing for multi-page PDFs
  • Customizable stamp library
  • Realistic stamp effects with aging
  • Precise stamp adjustment
  • One-click common stamp setup
  • Direct opening from external apps
Features
Read full description

一款简洁高效的PDF和图片盖章应用,让文档签署变得轻松便捷。 核心功能: • 支持PDF/DOC/DOCX文档和图片文件快速盖章 • 多页PDF文档批量处理,逐页精准定位 • 完整的印章库管理系统,支持自定义创建、编辑、查看及下载印章图片到本地 • 印章做旧效果处理,模拟真实印章质感 • 精细化印章微调功能,位置、大小随心调节 • 常用印章一键设置,提升工作效率 • 支持外部应用直接打开PDF/DOC/DOCX文件进行盖章 • 一键分享功能,盖章完成即可分享文档 使用场景: • 合同协议快速签署盖章 • 公文文件加盖公章 • 个人证件材料盖章确认 • 移动办公文档处理 产品特色: • 界面简洁,操作直观 • 专业印章库,支持批量管理 • 真实印章效果,支持做旧处理 • 无缝外部文件集成,从任何APP直接打开 • 本地处理,保护文档隐私 • 无需联网,随时随地使用 让繁琐的盖章工作变得简单高效,是您移动办公的得力助手。

Screenshots

Permutation Combination1 screens
PDF快速盖章4 screens

Verdict

The call

The clearest difference is price: Permutation Combination at Free against PDF快速盖章's $4.99. Permutation Combination also leads on update cadence (every 2 days vs every 4 months) and device support (3 vs 1). PDF快速盖章's advantage is ads (none vs shown). On in-app purchases 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

Permutation Combination is free to download; PDF快速盖章 costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Permutation Combination ships an update every 2 days, PDF快速盖章 every 4 months. The most recent releases landed on June 1, 2026 and September 1, 2026 respectively.

Scorecard6 real differences · 2 level
Permutation Combination versus PDF快速盖章: the parameters behind the verdict, then further details
ParameterPermutation CombinationPDF快速盖章
PriceFree — better$4.99
Positive reviews0.0% of reviews—
Update frequencyEvery 2 days — betterEvery 4 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better17.6
Further details — not scored
Size31 MB27 MB
Age rating4+4+
DeveloperHIWAZERO海昕 顾

In-app purchases

None

Permutation Combination

No in-app purchases

None

PDF快速盖章

No in-app purchases

Questions

Is Permutation Combination free?
Permutation Combination is free to download, with no in-app purchases.
Is PDF快速盖章 free?
PDF快速盖章 costs $4.99, with no in-app purchases.
Do Permutation Combination or PDF快速盖章 have ads?
Permutation Combination shows ads; PDF快速盖章 does not.
Which is updated more often, Permutation Combination or PDF快速盖章?
Permutation Combination ships an update every 2 days, and PDF快速盖章 every 4 months. Most recently, Permutation Combination was updated on June 1, 2026 and PDF快速盖章 on September 1, 2026.

Other comparisons