J vs WeldZip
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J
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J-Weld is a mobile APP which is used to remote welding machines.
WeldZip
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The Welding Assistant for Professionals 1. Filler Metal Data: Access detailed information on welding materials, including chemical composition, mechanical properties, and corrosion resistance, to make informed decisions. 2.Welding Tools: -Calculate weld material consumption and heat input. -Use DeLong and Schaeffler diagrams for stainless steel metallurgy. -Determine preheat temperatures and hardness conversions. -Decode welding symbols and calculate J/X coefficients for metals. 3.Welding Documents: Explore a library of patents, technical articles, and professional resources to stay updated on industry trends. 4.Welding Dictionary: A multilingual tool for quick translations of welding terms, making communication across languages effortless. 5. Welding Q&A: Get expert answers to your welding questions and share knowledge with a community of professionals.
Screenshots
Verdict
The clearest difference is update cadence: J at every 3 months against WeldZip's every 8 months. WeldZip's advantage is iOS requirement (12.0 vs 15.6). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
J ships an update every 3 months, WeldZip every 8 months. The most recent releases landed on August 29, 2026 and September 9, 2026 respectively.
| Parameter | J | WeldZip |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 85 MB |
| Age rating | 4+ | 4+ |
| Developer | 深圳市佳士科技股份有限公司 | Shanghai KongDe IT Co., LTD. |
In-app purchases
J
No in-app purchases
WeldZip
No in-app purchases
