# Calcbot 2 vs Vacci Dropper

The clearest difference is in-app purchases: Vacci Dropper at none against Calcbot 2's 1. Calcbot 2's advantage is device support (4 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Calcbot 2 sells 1 one-off in-app purchase. Vacci Dropper asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 18, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Calcbot 2 | Vacci Dropper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (11K ratings)](https://appshunter.io/ios/app/calcbot-2/id376694347/reviews)** | — |
| Number of ratings | **11K** | — |
| Positive reviews | 60.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tapbots](https://appshunter.io/developer/293642940) | [Colorado State University](https://appshunter.io/developer/527760765) |

## What reviewers say

### Calcbot 2

[App page](https://appshunter.io/ios/app/calcbot-2/id376694347)

This app offers a smart calculator with a history tape and expression view to track your calculations. It includes over 500 unit conversions and scientific functions, with an Apple Watch extension for on-the-go use.

**Highlights:** History tape for saved calculations, Expression view for typed input, Over 500 unit conversions, Apple Watch extension, Scientific functions in landscape, Favorites for instant access

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calcbot Pro | $1.99 | one-time |

**What reviewers like**

- 💻 Flexible calculator & conversions
- 📝 Comprehensive history tape
- 🎨 Customizable themes and icons
- ⌚️ Apple Watch app
- 🔢 Supports advanced calculations

**What reviewers complain about**

- ⚠️ Lack of updates and support
- 🚫 Removing free features behind paywall
- 🐞 Bugs and glitches (history tape issues, crashing)
- 🕰️ Slow loading times
- 🤔 Unintuitive interface for conversions

**Reported bugs**

- History tape not recording all calculations
- Conversion settings not syncing to Apple Watch
- App crashing on launch for some users
- Blank app icons after iOS updates

**Requested features**

- Dark mode option
- Widgets for quick access
- More currency and unit conversions
- Improved Apple Watch integration
- Ability to edit calculations in history tape


### Vacci Dropper

[App page](https://appshunter.io/ios/app/vacci-dropper/id6468026746)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calcbot 2 free?

Calcbot 2 is free to download, with in-app purchases available.

### Is Vacci Dropper free?

Vacci Dropper is free to download, with no in-app purchases.

### Do Calcbot 2 or Vacci Dropper have ads?

Neither Calcbot 2 nor Vacci Dropper shows ads.

### Which is updated more often, Calcbot 2 or Vacci Dropper?

Calcbot 2 ships an update every 2 months, and Vacci Dropper every 2 months. Most recently, Calcbot 2 was updated on October 18, 2026 and Vacci Dropper on September 27, 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.*