Tacit OA vs 密九通
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tacit OA
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高效智能的协同管理平台，有效解决企业信 息整合、公文流转、项目管理等应用需求
密九通
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密九通是基于标识密码(SM9)技术对移动智能终端重要数据的传输、存储和分享进行加密保护。 实现了语音通话、通讯录、短信、照片、文件和即时通讯消息的加密保护。 防止攻击者利用系统漏洞、恶意监听、植入病毒木马等手段盗取敏感数据，保障移动智能终端数据安全。 为政府、金融、能源、军队、运营商和大型企业等行业提供移动智能终端数据的安全保障服务。
Screenshots
Verdict
The clearest difference is update cadence: Tacit OA at every 3 weeks against 密九通's every 11 months. 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. Neither carries in-app purchases, so what you see is what you pay.
Tacit OA ships an update every 3 weeks, 密九通 every 11 months. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.
| Parameter | Tacit OA | 密九通 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 154 MB | 91 MB |
| Age rating | 4+ | 4+ |
| Developer | Jiu Tian Yun Technology (wuhan) Limited Company | ShenZhen AoLian Information Security Technology Co.,Ltd. |
In-app purchases
Tacit OA
No in-app purchases
密九通
No in-app purchases
