STS2 vs CTG SASE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
STS2
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Smart Tunnelling System is a practical application specially designed for the tunnel construction industry. STS provides shield construction enterprises with comprehensive data collection, storage, monitoring and intelligent decision-making services based on big data analysis. It mainly realizes the functions of remote real-time monitoring, tunneling progress control, report management, statistical analysis and business management of roadheader cluster.
CTG SASE
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CTG SASE是一款SAAS化云安全服务，重构了网络与安全边界，提供零信任网络访问、终端安全、上网行为管控、数据安全等服务，实现任意用户在任意位置对云上业务或数据中心随时随地、低延迟、更安全的动态访问，为IT建设提供了敏捷的的开通、交付效率，同时降低了建设成本，助力企业数字化转型。
Screenshots
Verdict
STS2 and CTG SASE are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
STS2 ships an update every 2 months, CTG SASE every 6 weeks. The most recent releases landed on September 6, 2026 and June 7, 2026 respectively.
| Parameter | STS2 | CTG SASE |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 76 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | 中铁工程装备集团有限公司 | China Telecom Cybersecurity Technology Co.,Ltd |
In-app purchases
STS2
No in-app purchases
CTG SASE
No in-app purchases
