# J vs Bolt Calculation & Analysis

The clearest difference is update cadence: Bolt Calculation & Analysis at every 3 weeks against J's every 3 months. J's advantage is iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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, Bolt Calculation & Analysis every 3 weeks. The most recent releases landed on October 14, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | J | Bolt Calculation & Analysis |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 30 MB | 4 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [深圳市佳士科技股份有限公司](https://appshunter.io/developer/1494882581) | [KORAY GULPINAR](https://appshunter.io/developer/1847711120) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-weld/id6469101974)

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

**In-app purchases:** none


### Bolt Calculation & Analysis

[App page](https://appshunter.io/ios/app/bolt-calculation-and-analysis/id6754289786)

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

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is Bolt Calculation & Analysis free?

Bolt Calculation & Analysis is free to download, with no in-app purchases.

### Do J or Bolt Calculation & Analysis have ads?

Neither J nor Bolt Calculation & Analysis shows ads.

### Which is updated more often, J or Bolt Calculation & Analysis?

J ships an update every 3 months, and Bolt Calculation & Analysis every 3 weeks. Most recently, J was updated on October 14, 2026 and Bolt Calculation & Analysis on October 25, 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.*