# CarbonData vs Vision Express

The clearest difference is review sentiment: CarbonData at 80% against Vision Express's 29%. Vision Express's advantage is in-app purchases (none vs 1) and update cadence (every 3 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CarbonData sells 1 in-app purchase, starting at $9.99 per month. Vision Express asks for nothing beyond the download.

CarbonData ships an update monthly, Vision Express every 3 days. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CarbonData | Vision Express |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/carbondata/id1482376289/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **80.0% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 13 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Vandyke Consulting LTD](https://appshunter.io/developer/1482376288) | [LocumBell](https://appshunter.io/developer/1445041649) |

## What reviewers say

### CarbonData

[App page](https://appshunter.io/ios/app/carbondata/id1482376289)

This app streamlines the process of generating and issuing chimney-sweeping certificates. Personalize certificates with company details, customer information, and fault reports. Easily export completed certificates as PDFs via email, with options to attach photos and store copies locally.

**Highlights:** Personalized certificate generation, Customer contact integration, Fault reporting with traffic light system, Customer consent and signature capture, PDF certificate export via email, Local data storage, CSV data export

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock the app | $9.99 | per month |


### Vision Express

[App page](https://appshunter.io/ios/app/vision-express/id1535000192)

This app connects businesses with locum professionals, allowing users to find and book available shifts. It also facilitates on-the-go invoicing and provides real-time notifications for relevant opportunities.

**Highlights:** Find locum shifts, Book locum days, Manage invoicing, Push notifications for new shifts, Apply for shifts, Real-time availability

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CarbonData free?

CarbonData is free to download, with in-app purchases available.

### Is Vision Express free?

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

### Do CarbonData or Vision Express have ads?

Neither CarbonData nor Vision Express shows ads.

### Which is updated more often, CarbonData or Vision Express?

CarbonData ships an update monthly, and Vision Express every 3 days. Most recently, CarbonData was updated on October 3, 2026 and Vision Express on October 24, 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.*