KeyCodeCheck vs AiYanJi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyCodeCheck
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The new feature is called "Key Grid." The key codes are displayed in a grid format. It automatically scrolls and highlights according to the keys you type. You can quickly and comprehensively check which keys are correctly recognized or not recognized by your device. --- "KeyCodeCheck" is an easy-to-use hardware keyboard keycode confirmation app with a simple UI for intuitive operation. Features: 1. Intuitive UI: With a straightforward design, navigating the app is effortless. No complicated procedures are required—just open, type a key, and confirm. That's it. 2. Key Typed Confirmation: Simply type a key, and its corresponding keycode is instantly displayed. This user-friendly app allows you to quickly retrieve the information you need. 3. Compatibility with Various Keyboards: Compatible with a variety of hardware keyboards, whether USB or Bluetooth connected. No need to worry about the connection method; you can check the keycodes for any keyboard. 4. Support for Special Keys: Shift key, Command key, Option key, Capslock key, and other special keys are supported. It works seamlessly with the operation of your familiar keyboard. 5. Keydown/Keyup Display: Displaying both the moment a key is pressed (keydown) and released (keyup), this feature is perfect for those who want to closely examine keyboard behavior. 6. Key Grid The key codes are displayed in a grid format. It automatically scrolls and highlights according to the keys you type. You can quickly and comprehensively check which keys are correctly recognized or not recognized by your device. Explore and confirm keyboard keycodes effortlessly with "KeyCodeCheck". Quickly identify the keycodes for each key on your device. Feel free to ask questions or provide feedback. Enjoy the simplicity of KeyCodeCheck.
AiYanJi
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爱验机-精准一键验机:把 iPhone 读懂、讲清,再帮你收窄换机参考。 【重要】本应用为第三方设备信息查询工具,**不是** Apple Inc. 官方 App,不提供官方诊断、认证检测或应用内购机。 【创意亮点】 • 护照式本机档案 +「本机实测 / 型号资料(AI)」强制分栏,来源可信 • 底栏正中「一键验机」:本地分步扫描与结果精查,非跑分、非官方检测 • 机况指数:本地多维汇总当前分与可达分,并给出可完成的提升任务 • 本地参数百科 ⓘ:离线讲清术语,不占 AI 次数 • 「我的能力」五区伙伴图鉴 + 本机通关阅读进度 • 换机改造台:每答一题,候选机型本地即时收窄;仅终局生成结论 • 自设服役计划:再用多久 / 购机年限 / 固定到期日;本机与换机页可进;可选到期提醒 【本机】 • 护照式机况速览:存储、电量、系统、网络等本机实测信息 • 一键生成完整型号档案:芯片、屏幕、影像、充电、AI 能力等分区资料(每日最多 10 次;同机型缓存命中不计次) • 可留下机况快照,便于日后对照 【一键验机】 • 底栏正中入口:本地扫描存储、内存、电池、芯片等维度 • 结果瓷砖可查看详情;可选生成型号资料(计档案 AI 次) 【能力】 • 把本机当伙伴:芯片 / 显示 / 影像 / 传感 / 连接五项本事 • 与本机对照:具备 / 部分 / 不具备 • 了解进度:读完相关说明可点亮进度与通关 【换机】 • 按预算、性能、影像、AI 等维度答题,候选逐步收窄 • 生成换机结论后查看推荐与相对本机提升点(每日最多 10 次) • Safari 打开 Apple 官网了解机型(不提供应用内购机) • 保养问答:充电、发热、存储整理等短问答(每日最多 10 次) 【服役计划】 • 自设再用多久、购机服役年限或固定到期日 • 从本机 / 换机顶条或验机结果进入;可选本地到期提醒 【我的】 • 机况快照时间线、收藏、今日 AI 剩余次数(档案 / 换机 / 保养分池) • 设置内打开隐私政策与联系支持(系统浏览器) 【重要说明】 • 档案补全、换机结论、保养问答 AI 次数分开计算,各每日最多 10 次 • 型号资料与换机建议由第三方 AI 生成,可能不准确或滞后;界面不展示具体 AI 服务商标识 • 电池等信息仅展示系统公开可读字段或用户手填参考;换机价格仅为档位印象,非实时成交价 • 部分页面展示第三方广告(穿山甲 / 优量汇) • 无账号、无内购、完全免费 • 信息仅供参考,不构成购买建议或官方诊断结论 购机与售后请以 Apple 官网及授权渠道为准。
Screenshots
Verdict
The clearest difference is ads: KeyCodeCheck at none against AiYanJi's shown. AiYanJi's advantage is update cadence (every 4 days vs every 2 months). On price, in-app purchases, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
KeyCodeCheck ships an update every 2 months, AiYanJi every 4 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.
| Parameter | KeyCodeCheck | AiYanJi |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Kenta Akimoto | Neramo Renelac |
In-app purchases
KeyCodeCheck
No in-app purchases
AiYanJi
No in-app purchases









