Comparison

Graycode vs 专利大王

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

Head to head
About

Graycode

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

Highlights
  • Decimal, hex, binary, Gray code conversion
  • Real-time updates
  • Handy calculator for engineers
  • Animated Tower of Hanoi solution
  • Supports iPhone, iPad, iPod
Features
Read full description

This app is used to convert numbers among decimal, hex, binary and gray code. If a user changes any one of these numbers, the other ones will change accordingly. It is a handy calculator for engineers to obtain the binary or gray code values from a decimal, or vise versa. In addition, an animated solution of a Hanoi Tower with three disks is also demonstrated based on the input number.

About

专利大王

Features
Read full description

合享智慧,全新改版专利大王。更新的界面,更快的访问速度。 专利大王,可在手机上轻松实现中文检索浏览全球157个国家、地区和组织的1.6亿件专利数据,精准获取专利的技术、法律和商业信息,免费下载各国专利全文。检索方式快捷、方便,支持简单检索、高级检索、专题库、专利市场、专利问答、实时榜单等多项功能。 【专利检索】用户可以通过输入词组或一段话,进行专利检索,并查看专利的技术、法律和商业信息。基于北京合享智慧公司全面优质的专利数据资源,涵盖了全世界120个国家/组织/地区1亿余件专利信息,并且还具有用中文检索英文专利的功能,常用字段检索功能,更精准,更懂你。 【高级检索】高级检索功能,检索字段包括:号码、标题、标题摘要、申请人、发明人、代理机构、代理人、审查员、省份、城市和分类号,实现更加精准检索。 【分类检索】分类检索目前已上线九个领域的专利导航,涉及生活必需、电学、物理、化学、机械、作业运输、建筑业、纺织造纸和区块链,点击细分类别可直接查看相关专利,帮助用户快速获取相关领域技术信息。 【知识问答】点击首页知识问答,用户可以查看已有问题,也可以一起参与问答:在专利问答页面提出问题,在问题详情页面回答问题,还可对已有回答点赞。 【实时榜单】专利大王实时榜单目前已上线中国专利运营排行榜(许可/转让/质押)、知名企业家创新榜、企业发明授权专利排行榜、全球区块链企业专利排行榜、创业板企业发明授权专利排行榜等榜单,帮助企业实时追踪企业技术发展脉络,洞悉企业创新趋势和行业发展态势。 【成就勋章】无论你是发明人、企业专利负责人还是专利代理人,这里都有一份专属的创新报告等着您;无论是企业、高校还是专利代理机构,只要您走在创新之路上,就一定能看到一份闪闪发光的成绩单。 【资讯】汇集新鲜科技资讯和IP圈新闻,随手就看。

Screenshots

Graycode4 screens
专利大王4 screens

Verdict

The call

The clearest difference is price: 专利大王 at Free against Graycode's $2.99. 专利大王 also leads on update cadence (every 5 weeks vs every 10 months). Graycode's advantage is in-app purchases (none vs 5) and ads (none vs shown). On device support and iOS requirement 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

专利大王 is free to download; Graycode costs $2.99 up front. 专利大王 sells 5 one-off in-app purchases. Graycode asks for nothing beyond the download.

UpkeepUpdate frequency

Graycode ships an update every 10 months, 专利大王 every 5 weeks. The most recent releases landed on October 11, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 6 level
Graycode versus 专利大王: the parameters behind the verdict, then further details
ParameterGraycode专利大王
Price$2.99Free — better
Rating3.0 (2 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings2 — better—
Update frequencyEvery 10 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.012.0
Further details — not scored
Size2 MB36 MB
Age rating4+4+
DeveloperDuo Pisceses, Inc.BEIJING INCOIDEA CO.LTD

In-app purchases

None

Graycode

No in-app purchases

5 purchases

专利大王

One-time5
  • 专利大王VIP月卡$8.99
  • 专利大王VIP季卡$19.99
  • 专利大王VIP半年卡$34.99
Show 2 more
  • 专利大王VIP年卡$59.99
  • 专利大王VIP年费会员$64.99

Questions

Is Graycode free?
Graycode costs $2.99, with no in-app purchases.
Is 专利大王 free?
专利大王 is free to download, with in-app purchases available.
Do Graycode or 专利大王 have ads?
专利大王 shows ads; Graycode does not.
Which is updated more often, Graycode or 专利大王?
Graycode ships an update every 10 months, and 专利大王 every 5 weeks. Most recently, Graycode was updated on October 11, 2026 and 专利大王 on October 6, 2026.

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