知了单词书 vs OpenFlat
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
知了单词书
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知了单词书 - 智能单词记忆助手 高效背单词，科学提升词汇量！ 核心功能： 智能学习计划：自定义目标，AI生成复习周期，支持艾宾浩斯遗忘曲线; 全维度学习追踪：可视化数据看板、错题本自动整理、多设备云端同步; 发音辅助工具：真人英美式发音跟读、AI语音评分、离线语音查词; 沉浸式体验：无广告干扰、夜间模式、桌面快捷组件; 特色优势： 碎片时间利用：5分钟快速记忆模式; 隐私政策:https://www.aplus123.cn/html?type=private 用户协议:https://www.aplus123.cn/html?type=service
OpenFlat
This app provides an online teaching platform for individual instructors, featuring interactive whiteboards, audio/video communication, presentation tools, and recording capabilities. Users can easily join, create, and schedule virtual classrooms. It aims to be the preferred tool for online educators.
- Multi-person online whiteboard
- Audio and video communication
- PPT presentation with animations
- Room recording and playback
- Screen sharing
- Room creation, joining, and scheduling
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OpenFlat 是为个人老师设计的在线授课软件，支持多人在线白板互动、音视频交流、PPT 演示（包含动画效果）、房间录制和回放、屏幕共享等，个人用户可以直接通过微信、手机号验证码登录，登录成功后就可以方便的加入、创建、预定房间。 目前我们仍然在持续优化产品体验，我们希望 OpenFlat 可以成为个人教师在线上课首选的教学工具。 如果遇到使用问题，欢迎邮箱反馈：support@openflat.tech
Screenshots
Verdict
The clearest difference is update cadence: 知了单词书 at every 5 days against OpenFlat's every 2 weeks. On price, ads, 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
Both are free to download. 知了单词书 sells 1 one-off in-app purchase and OpenFlat sells 10 in-app purchases, starting at $49.99 per month. Whichever you choose, the download price is not the number that matters.
知了单词书 ships an update every 5 days, OpenFlat every 2 weeks. The most recent releases landed on September 19, 2026 and September 13, 2026 respectively.
| Parameter | 知了单词书 | OpenFlat |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 63 MB | 81 MB |
| Age rating | 17+ | 4+ |
| Developer | 重庆知竣文化传媒有限公司 | 柳 杨 |
In-app purchases
知了单词书
- 知了1年会员$39.99
OpenFlat
- OpenFlat 高级版连续包月$49.991 Month
- OpenFlat 基础版连续包年$79.991 Year
- OpenFlat 课次购买$0.99
- OpenFlat 基础版一个月$6.99
- OpenFlat 专业版一个月$22.99
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- OpenFlat 高级版一个月$49.99
- OpenFlat 基础版十二个月$79.99
- OpenFlat 专业版十二个月$249.99
- OpenFlat 高级版十二个月$599.99
- OpenFlat 畅享版$900.00
