# DNS Optimizer vs NSM ISP Billing

The clearest difference is in-app purchases: NSM ISP Billing at none against DNS Optimizer's 2. NSM ISP Billing also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DNS Optimizer sells 2 one-off in-app purchases. NSM ISP Billing asks for nothing beyond the download.

DNS Optimizer ships an update every 11 days, NSM ISP Billing every 3 weeks. The most recent releases landed on October 15, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | DNS Optimizer | NSM ISP Billing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/dns-optimizer-server-changer/id6741016224/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 39 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ATAKAN YILDIRIM](https://appshunter.io/developer/1792591490) | [NSM TECHNOLOGY CO., LTD.](https://appshunter.io/developer/6809642376) |

## What reviewers say

### DNS Optimizer

[App page](https://appshunter.io/ios/app/dns-optimizer-server-changer/id6741016224)

Optimize your internet connection by easily switching DNS servers. Benchmark performance, block unwanted content, and enhance online gaming with secure and private browsing. Supports Wi-Fi and cellular networks on iPhone, iPad, and Mac.

**Highlights:** Switch system-wide DNS configurations, Benchmark DNS server performance, Pre-configured trusted DNS servers, Add custom encrypted DNS servers (DoH/DoT), Block ads and unwanted content, Improve online gaming latency

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DNS Optimizer Pro | $9.99 | one-time |
| DNS Optimizer Pro | $19.99 | one-time |


### NSM ISP Billing

[App page](https://appshunter.io/ios/app/nsm-isp-billing/id6758319810)

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

**In-app purchases:** none


## Frequently asked questions

### Is DNS Optimizer free?

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

### Is NSM ISP Billing free?

NSM ISP Billing is free to download, with no in-app purchases.

### Do DNS Optimizer or NSM ISP Billing have ads?

Neither DNS Optimizer nor NSM ISP Billing shows ads.

### Which is updated more often, DNS Optimizer or NSM ISP Billing?

DNS Optimizer ships an update every 11 days, and NSM ISP Billing every 3 weeks. Most recently, DNS Optimizer was updated on October 15, 2026 and NSM ISP Billing on October 19, 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.*