# Callblock vs Critical Digital Service

The clearest difference is in-app purchases: Critical Digital Service at none against Callblock's 2. Critical Digital Service also leads on update cadence (every 5 weeks vs every 2 months). Callblock's advantage is iOS requirement (10.0 vs 12.0). On price, ads and device support there is nothing between them.

Both are free to download. Callblock sells 2 in-app purchases, starting at $1.99 per month. Critical Digital Service asks for nothing beyond the download.

Callblock ships an update every 2 months, Critical Digital Service every 5 weeks. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Callblock | Critical Digital Service |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (50 ratings)](https://appshunter.io/ios/app/callblock/id1148495423/reviews)** | — |
| Number of ratings | **50** | — |
| Positive reviews | 53.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 107 MB | 92 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rocketship Apps](https://appshunter.io/developer/1104564271) | [PUBLIC TELECOMMUNICATIONS COMPANY 'STCSC SPECIALIZED'](https://appshunter.io/developer/1396379044) |

## What reviewers say

### Callblock

[App page](https://appshunter.io/ios/app/callblock/id1148495423)

This app helps you block unwanted telemarketing calls on your iPhone. It uses a large, constantly updated directory to identify and filter out spam calls, offering a high accuracy rate. While it cannot block calls with no caller ID, it significantly reduces interruptions from telemarketers.

**Highlights:** Blocks telemarketing calls, Large directory of telemarketers, High identification accuracy, Customizable caller list, iOS call blocking integration

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $19.99 | per year |

**What reviewers like**

- 👍 Blocks unwanted calls effectively
- 👍 Simple and user-friendly interface
- 👍 Affordable subscription fee
- 👍 No ads
- 👍 Community-driven block list

**What reviewers complain about**

- 👎 Misleading regarding free functionality
- 👎 Immediate charging after free trial signup
- 👎 Subscription required for basic function
- 👎 Does not work on all iOS versions
- 👎 App doesn't always block calls

**Reported bugs**

- Does not work on iOS 14
- App won't stop loading
- Bug prevents unblocking calls
- Error enabling extension
- Does not work with passcode protection

**Requested features**

- Ability to see blocked calls log
- Option to provide updates to categories
- Improved blocking for local number spoofing
- Clearer indication of active blocking
- Dark mode option


### Critical Digital Service

[App page](https://appshunter.io/ios/app/critical-digital-service/id1469724877)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Callblock free?

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

### Is Critical Digital Service free?

Critical Digital Service is free to download, with no in-app purchases.

### Do Callblock or Critical Digital Service have ads?

Neither Callblock nor Critical Digital Service shows ads.

### Which is updated more often, Callblock or Critical Digital Service?

Callblock ships an update every 2 months, and Critical Digital Service every 5 weeks. Most recently, Callblock was updated on October 21, 2026 and Critical Digital Service on October 9, 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.*