# DD Zone vs Simpli Soda CO2 Refills

The clearest difference is review sentiment: DD Zone at 86% against Simpli Soda CO2 Refills's 34%. DD Zone also leads on ads (none vs shown) and update cadence (fortnightly vs every 11 months). Simpli Soda CO2 Refills's advantage is rating (4.7 vs 4.0) and ratings volume (2.1K vs 4). On price, 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.

Simpli Soda CO2 Refills holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Simpli Soda CO2 Refills has 2.1K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 86% of DD Zone's written reviews are positive against 34% of Simpli Soda CO2 Refills's, so the app with the better star average is not the one people write more warmly about.

DD Zone ships an update fortnightly, Simpli Soda CO2 Refills every 11 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | DD Zone | Simpli Soda CO2 Refills |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/dd-zone/id1555923302/reviews) | **[4.7 (2.1K ratings)](https://appshunter.io/ios/app/simpli-soda-co2-refills/id6449626991/reviews)** |
| Number of ratings | 4 | **2.1K** |
| Positive reviews | **85.7% of reviews** | 33.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 11 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 117 MB | 45 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Quantic Cloud Technologies Pvt. Ltd.](https://appshunter.io/developer/1539260475) | [Simpli Soda](https://appshunter.io/developer/1689916915) |

## What reviewers say

### DD Zone

[App page](https://appshunter.io/ios/app/dd-zone/id1555923302)

This app allows merchants to digitally share receipts via QR code or app clips. Upcoming features include in-app payment options for unpaid orders using Apple Pay or cards, enabling zero-contact transactions.

**Highlights:** QR code receipt sharing, App clip receipt sharing, In-app payment for unpaid orders, Apple Pay integration, Card payment integration, Zero-touch transactions

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

**In-app purchases:** none


### Simpli Soda CO2 Refills

[App page](https://appshunter.io/ios/app/simpli-soda-co2-refills/id6449626991)

This app simplifies CO2 cylinder exchanges for home carbonation systems. It allows users to easily order exchanges, manage delivery locations and payment information, and save money through competitive pricing and discounts.

**Highlights:** Easy CO2 exchange ordering, Manage delivery addresses, Update payment information, Save money on exchanges, Streamlined transaction process

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use and well supported
- 🚀 Fast reliable service
- 👍 Easy to use website
- 👍 Great service
- 👍 Delicious & easy

**What reviewers complain about**

- 🐛 App quality hit or miss
- 💸 Increasing prices
- 🐛 App doesn't do anything
- ⏳ Timing sucks
- 🐛 App freezes up

**Reported bugs**

- App freezes on opening
- App freezes during login
- App doesn't open or spins
- App crashes during setup/ordering
- App errors out during checkout (address to payment)

**Requested features**

- Improve cost competitiveness
- Allow users to stay logged in
- Simplify two-factor authentication
- Allow multiple shipping addresses
- Improve Apple Pay integration


## Frequently asked questions

### Is DD Zone free?

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

### Is Simpli Soda CO2 Refills free?

Simpli Soda CO2 Refills is free to download, with no in-app purchases.

### Which has better reviews, DD Zone or Simpli Soda CO2 Refills?

Simpli Soda CO2 Refills is rated higher. DD Zone averages 4.0 out of 5 from 4 ratings, while Simpli Soda CO2 Refills averages 4.7 from 2.1K ratings.

### Do DD Zone or Simpli Soda CO2 Refills have ads?

Simpli Soda CO2 Refills shows ads; DD Zone does not.

### Which is updated more often, DD Zone or Simpli Soda CO2 Refills?

DD Zone ships an update fortnightly, and Simpli Soda CO2 Refills every 11 months. Most recently, DD Zone was updated on November 3, 2026 and Simpli Soda CO2 Refills on November 7, 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.*