Comparison

STS2 vs ChatMax AI Chatbot Assistant

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

Head to head
About

STS2

Features
Read full description

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.

About

ChatMax AI Chatbot Assistant

Get instant, comprehensive answers to your questions with an advanced AI chatbot. This tool provides tailored advice, creative inspiration, and professional input for various writing needs, from stories to translations.

Highlights
  • Instant answers to questions
  • AI-powered writing assistance
  • Creative content generation
  • Language practice and translation
  • Tailored advice and professional input
  • Information retrieval on any topic
Features
Read full description

Introducing the Chat Max AI Ask real questions. Get complete answers. Ask your questions – short, long or anything in between. The more precise you ask, the better the answer. Chat Max AI App to write anything and get instant answers. Chat with the most advanced AI! With Chat Max in your pocket, you’ll find: - Instant answers - Tailored advice - Creative inspiration - Professional input - Learning opportunities - Stories, poems, song lyrics, scripts - Language practice & Text translation - Information about anything - Food recipes Join millions of users and try out the app that’s been captivating the world. Download Chat Max now! Subscription Rules: 1. Apple will charge your iTunes account for the subscription on the last day of the trial. 2. After you subscribe, you can manage your subscriptions in the Apple ID of the device you are using. 3. Your subscription will automatically renew unless it is canceled at least 24 hours before the deadline of your current membership. 4. If you cancel your subscription during the trial period, you will not be charged any fees, but you may not be able to use the service right away. 5. By subscribing, you are deemed to have read and agreed to the User Agreement and Automatic Renewal Agreement. Contact us: support@chatmaxai.app Terms of Service: https://chatmaxai.app/terms-of-service Privacy Policy: https://chatmaxai.app/privacy-policy EULA Link:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

STS23 screens
ChatMax AI Chatbot Assistant4 screens

Verdict

The call

The clearest difference is in-app purchases: STS2 at none against ChatMax AI Chatbot Assistant's 9. STS2 also leads on ads (none vs shown). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ChatMax AI Chatbot Assistant sells 9 in-app purchases, starting at $4.99 per 7 days. STS2 asks for nothing beyond the download.

UpkeepUpdate frequency

STS2 ships an update every 2 months, ChatMax AI Chatbot Assistant every 4 weeks. The most recent releases landed on September 6, 2026 and August 13, 2026 respectively.

Scorecard2 real differences · 8 level
STS2 versus ChatMax AI Chatbot Assistant: the parameters behind the verdict, then further details
ParameterSTS2ChatMax AI Chatbot Assistant
PriceFreeFree
Rating—3.8 (13 ratings) — better
Positive reviews—42.9% of reviews
Number of ratings—13 — better
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.012.0 — better
Further details — not scored
Size76 MB42 MB
Age rating4+12+
Developer中铁工程装备集团有限公司Greycat Network Tech Co., Ltd

In-app purchases

None

STS2

No in-app purchases

9 purchases

ChatMax AI Chatbot Assistant

Subscriptions9
  • Weekly Pro$4.997 Days
  • Weekly Membership3 Days trial$6.997 Days
  • Weekly Lite3 Days trial$7.997 Days
Show 6 more
  • Month Pro$15.991 Month
  • Month Pro$19.991 Month
  • Chat AI Lifetime$39.991 Year
  • Yearly Lite$49.991 Year
  • 1 Year Plan for the Best Price$59.991 Year
  • Yearly Advanced$69.991 Year

Questions

Is STS2 free?
STS2 is free to download, with no in-app purchases.
Is ChatMax AI Chatbot Assistant free?
ChatMax AI Chatbot Assistant is free to download, with in-app purchases available.
Do STS2 or ChatMax AI Chatbot Assistant have ads?
ChatMax AI Chatbot Assistant shows ads; STS2 does not.
Which is updated more often, STS2 or ChatMax AI Chatbot Assistant?
STS2 ships an update every 2 months, and ChatMax AI Chatbot Assistant every 4 weeks. Most recently, STS2 was updated on September 6, 2026 and ChatMax AI Chatbot Assistant on August 13, 2026.

Other comparisons