Comparison

咔信 vs TrainTT

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

咔信

Features
Read full description

咔信是一款私有化部署安全通信系统,是用户自主可控的加密通讯工具。通信服务器使用高强度密码算法进行端到端加密,可全面、有效地保护用户即时通信的隐私安全。 功能特色: 高强度的数据加密:所有发送、接收的信息(文本、语音、图像、文件)高强度国密加密;加密语音通话,确保紧急事项高效沟通。 身份认证:白名单身份认证,确保用户身份真实可信。 终端数据防泄密:敏感信息可用阅后即焚防止信息外泄;手机不慎丢失,管理员可在管理后台“远程删除”手机数据,防止信息泄露。 重要文档安全管控:“安全文档”实现对重要文档加密后发送,只有指定的接收方才能打开,阅读及转发,通过权限控制、阅读与传播轨迹记录、内嵌水印保证泄密可追查等手段实现文档安全管控。

About

TrainTT

Features
Read full description

1.安全加密: 使用端到端全方位算法保障于安全防范。 2.简介体验:专注即时通讯,提供稳定的核心基础功能。 3.保护隐私:云端不保存聊天记录,可关闭已读回执,同时提供阅后即焚和销毁账号等保护用户隐私。 4.聊天: 提供文本,语音,图片,视频,文件,表情等聊天方式。

Screenshots

咔信4 screens
TrainTT4 screens

Verdict

The call

The clearest difference is update cadence: TrainTT at every 3 days against 咔信's every 2 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

咔信 ships an update every 2 months, TrainTT every 3 days. Both last shipped on November 3, 2026.

Scorecard1 real difference · 5 level
咔信 versus TrainTT: the parameters behind the verdict, then further details
Parameter咔信TrainTT
PriceFreeFree
Update frequencyEvery 2 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size109 MB49 MB
Age rating17+17+
DeveloperFuJian Beika Technology Co.,Ltd.Qian Yun Network Service Co., Ltd.

In-app purchases

None

咔信

No in-app purchases

None

TrainTT

No in-app purchases

Questions

Is 咔信 free?
咔信 is free to download, with no in-app purchases.
Is TrainTT free?
TrainTT is free to download, with no in-app purchases.
Do 咔信 or TrainTT have ads?
Neither 咔信 nor TrainTT shows ads.
Which is updated more often, 咔信 or TrainTT?
咔信 ships an update every 2 months, and TrainTT every 3 days. Most recently, 咔信 was updated on November 3, 2026 and TrainTT on November 3, 2026.

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