# THIET THACH vs TopAiChat

THIET THACH and TopAiChat 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.

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

THIET THACH ships an update monthly, TopAiChat every 3 weeks. The most recent releases landed on September 26, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | THIET THACH | TopAiChat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thiet-thach/id1610695962/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 41 MB | 58 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 9+ |
| Developer | [THIET THACH Group](https://appshunter.io/developer/1610695964) | [VIETNAMINVESTMENTRESEARCHANDDEVELOPMENTSOFTWARECOMPANY LIMITED](https://appshunter.io/developer/6780383073) |

## What reviewers say

### THIET THACH

[App page](https://appshunter.io/ios/app/thiet-thach/id1610695962)

This app assists first-time homeowners in planning and managing their home construction projects. It offers a library of design templates, practical building experience videos, and a tool to estimate construction costs per square meter. Connect directly with engineers and architects for online consultations and project management.

**Highlights:** Extensive home design template library, Video library for building experience, Self-service home construction cost calculator, Online consultations with engineers and architects, Project management tool for clients and THIET THACH Group

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### TopAiChat

[App page](https://appshunter.io/ios/app/topaichat/id6780383071)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is THIET THACH free?

THIET THACH is free to download, with no in-app purchases.

### Is TopAiChat free?

TopAiChat is free to download, with no in-app purchases.

### Do THIET THACH or TopAiChat have ads?

Neither THIET THACH nor TopAiChat shows ads.

### Which is updated more often, THIET THACH or TopAiChat?

THIET THACH ships an update monthly, and TopAiChat every 3 weeks. Most recently, THIET THACH was updated on September 26, 2026 and TopAiChat on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*