Graycode vs 专利大王
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Decimal, hex, binary, Gray code conversion
- Real-time updates
- Handy calculator for engineers
- Animated Tower of Hanoi solution
- Supports iPhone, iPad, iPod
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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.
专利大王
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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
Verdict
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
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.
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.
| Parameter | Graycode | 专利大王 |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 10 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 2 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | BEIJING INCOIDEA CO.LTD |
In-app purchases
Graycode
No in-app purchases
专利大王
- 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
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- 专利大王VIP年卡$59.99
- 专利大王VIP年费会员$64.99









