Graycode vs 小灵龙App
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.
小灵龙App
This app provides comprehensive mobile services for campus cards, including traditional card functions like consumption and authentication, enhanced with QR code capabilities. It offers features for managing your campus card, paying various campus fees, and booking campus facilities.
- Campus card management
- QR code functionality
- Campus fee payments
- Facility booking
- Card application and registration
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【小灵龙】是一款面向校园的一卡通服务APP，在传统卡消费、认证的基础上增加了二维码功能，为校园用户提供专业、全面的移动一卡通服务。 【校园卡管理】 提供全面的校园卡服务，充值、信息查询、账单查询、流水查询、挂失／解挂、失卡招领、校园卡在线申请、校友注册等 【校园缴费】 项目缴费、电费、网费、辅修费、等级考试费、党团费、培训费、学费 【校园预订】 为校内餐厅、场馆、会议室、自习室等场所提供预订服务
Screenshots
Verdict
The clearest difference is price: 小灵龙App at Free against Graycode's $2.99. 小灵龙App also leads on update cadence (monthly vs every 10 months) and ratings volume (12 vs 2). Graycode's advantage is rating (3.0 vs 1.0) and ads (none vs shown). On in-app purchases 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
小灵龙App is free to download; Graycode costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Graycode holds the better App Store score, 3.0 against 1.0. That said, the two scores are not equally well evidenced: 小灵龙App has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 67% of Graycode's written reviews are positive against 33% of 小灵龙App's.
Graycode ships an update every 10 months, 小灵龙App monthly. The most recent releases landed on August 26, 2026 and September 22, 2026 respectively.
| Parameter | Graycode | 小灵龙App |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | 1.0 (12 ratings) |
| Positive reviews | 66.7% of reviews — better | 33.3% of reviews |
| Number of ratings | 2 | 12 — better |
| Update frequency | Every 10 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 157 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | 北京新中新诚通信息技术股份有限公司 |
Customer experience
Graycode
小灵龙App
In-app purchases
Graycode
No in-app purchases
小灵龙App
No in-app purchases
