# Smart Instant Calculator vs Calculator Plug

The clearest difference is in-app purchases: Smart Instant Calculator at none against Calculator Plug's 4. Calculator Plug's advantage is ads (none vs shown) and update cadence (every 4 days vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Calculator Plug sells 4 in-app purchases, starting at $5.99 per month. Smart Instant Calculator asks for nothing beyond the download.

Smart Instant Calculator ships an update every 2 months, Calculator Plug every 4 days. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Smart Instant Calculator | Calculator Plug |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calculator-plug/id6775307587/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 34 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ichi Hosotsuji](https://appshunter.io/developer/1808829369) | [Mark Gabrielli](https://appshunter.io/developer/6775036752) |

## What reviewers say

### Smart Instant Calculator

[App page](https://appshunter.io/ios/app/smart-instant-calculator/id6749926057)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calculator Plug

[App page](https://appshunter.io/ios/app/calculator-plug/id6775307587)

Access over 450 specialized calculators for construction, finance, health, trades, and more. This app offers a clean, offline-capable interface for quick, accurate calculations without intrusive ads.

**Highlights:** 450+ searchable calculators, Offline functionality, Clean dark interface, Construction calculators, Finance calculators, Health and fitness calculators, Trades calculators

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $5.99 | per month |
| Pro+ Monthly | $9.99 | per month |
| Pro Lifetime | $29.99 | one-time |
| Pro+ Lifetime | $44.99 | one-time |


## Frequently asked questions

### Is Smart Instant Calculator free?

Smart Instant Calculator is free to download, with no in-app purchases.

### Is Calculator Plug free?

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

### Do Smart Instant Calculator or Calculator Plug have ads?

Smart Instant Calculator shows ads; Calculator Plug does not.

### Which is updated more often, Smart Instant Calculator or Calculator Plug?

Smart Instant Calculator ships an update every 2 months, and Calculator Plug every 4 days. Most recently, Smart Instant Calculator was updated on October 25, 2026 and Calculator Plug on October 14, 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.*