# RF Engineer's Calc vs Sync

The clearest difference is in-app purchases: RF Engineer's Calc at none against Sync's 4. Sync's advantage is update cadence (every 9 days vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sync sells 4 one-off in-app purchases. RF Engineer's Calc asks for nothing beyond the download.

RF Engineer's Calc ships an update every 10 months, Sync every 9 days. The most recent releases landed on September 5, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | RF Engineer's Calc | Sync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 9 days** |
| Size | 43 MB | 4 MB |
| Requires iOS | 16.1 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GRAHAM JOHN SMITH](https://appshunter.io/developer/1668396908) | [Sync-it.co.uk](https://appshunter.io/developer/1878336212) |

## What reviewers say

### RF Engineer's Calc

[App page](https://appshunter.io/ios/app/rf-engineers-calc/id1668396906)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sync

[App page](https://appshunter.io/ios/app/sync-it-plus/id6759370758)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hardware Unlock | Free | one-time |
| Sync-It 14 Day Trial | Free | one-time |
| Sync-it legacy unlock | $44.99 | one-time |
| Sync-It Full Unlock | $89.99 | one-time |


## Frequently asked questions

### Is RF Engineer's Calc free?

RF Engineer's Calc is free to download, with no in-app purchases.

### Is Sync free?

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

### Do RF Engineer's Calc or Sync have ads?

Neither RF Engineer's Calc nor Sync shows ads.

### Which is updated more often, RF Engineer's Calc or Sync?

RF Engineer's Calc ships an update every 10 months, and Sync every 9 days. Most recently, RF Engineer's Calc was updated on September 5, 2026 and Sync on September 21, 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.*