PJConverter vs TCL极光
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PJConverter
This tool offers precise coordinate transformations for GIS, surveying, and engineering professionals. It supports thousands of global coordinate systems and allows for custom projection creation with real-time validation and visual previews. Streamline your spatial data management with this efficient utility.
- Professional-grade conversion engine
- Extensive library of coordinate systems
- Customizable projection creation
- Visual projection previews
- Flexible format support
- Intuitive user interface
Read full descriptionHide full description
PJ Converter is the ultimate coordinate conversion tool designed for professionals and students in Geographic Information Systems (GIS), surveying, engineering, and related fields. Whether you're working with geodetic or projected coordinates, it delivers unparalleled accuracy and ease of use. Key Features * Professional-Grade Conversion Engine: Powered by the widely-used PROJ library to ensure every calculation is accurate and reliable. It supports forward, inverse, and full coordinate transformation pipelines to meet the most demanding professional needs. * Vast Coordinate System Library: Comes with thousands of built-in Coordinate Reference Systems (CRS) from authoritative sources like EPSG, covering the entire globe. The powerful search helps you find what you need in seconds. * Advanced Custom Projections: Need something specific? Easily create, edit, and manage your own projection definitions. The editor provides real-time syntax validation and ID conflict detection to make complex configurations foolproof. * Visual Projection Preview: Instantly generate a world map preview for any coordinate system. Visually assess a projection's distortion, area of use, and characteristics before you apply it. No more guesswork. * Flexible Formatting: Seamlessly switch between degrees (DMS) and radians for geographic coordinates. Pick coordinates visually from an integrated map to meet diverse data input and display requirements. * Simple & Efficient Experience: The "Recents" list automatically saves your frequently used projections for quick access. The entire interface is clean and focused, letting you perform conversions without distraction. PJ Converter is the ideal choice for field engineers, GIS analysts, geography students, and anyone who works with spatial data. Download now and make complex coordinate conversions simpler and more efficient than ever before.
TCL极光
This app focuses on distributed photovoltaic systems for homes and businesses. It aims to be a leading smart new energy service provider, offering a platform for asset development, construction, and operation in the solar energy sector.
- Distributed photovoltaic systems
- Household solar solutions
- Commercial solar solutions
- Overseas solar and storage pump market
- Asset development platform
- Construction and operation services
Read full descriptionHide full description
TCL光伏科技聚焦分布式光伏领域,以围绕户用分布式、商用分布式电站及海外光储泵市场为三大核心业务,致力打造全流程资产开发建设运营平台,成为一家用户为本的全球领先智慧新能源服务商。
Screenshots
Verdict
The clearest difference is price: TCL极光 at Free against PJConverter's $0.99. TCL极光 also leads on update cadence (every 8 days vs every 7 months) and iOS requirement (14.0 vs 17.0). On 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
TCL极光 is free to download; PJConverter costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PJConverter ships an update every 7 months, TCL极光 every 8 days. The most recent releases landed on September 24, 2026 and October 21, 2026 respectively.
| Parameter | PJConverter | TCL极光 |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 7 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 224 MB |
| Age rating | 4+ | 17+ |
| Developer | Zhikang Qin | 惠州TCL光伏科技有限公司 |
Customer experience
PJConverter
TCL极光
In-app purchases
PJConverter
No in-app purchases
TCL极光
No in-app purchases








