# Calc Engine vs 每日一毒Watch版

The clearest difference is in-app purchases: 每日一毒Watch版 at none against Calc Engine's 1. 每日一毒Watch版 also leads on iOS requirement (16.0 vs 18). Calc Engine's advantage is update cadence (daily vs every 4 days) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Calc Engine sells 1 one-off in-app purchase. 每日一毒Watch版 asks for nothing beyond the download.

Calc Engine ships an update daily, 每日一毒Watch版 every 4 days. The most recent releases landed on November 13, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Calc Engine | 每日一毒Watch版 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews)** | — |
| Number of ratings | **7** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 4 days |
| Monetization | Free | — |
| Size | 17 MB | 5 MB |
| Requires iOS | 18 | **16.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [秀华 李](https://appshunter.io/developer/1632733591) |

## What reviewers say

### Calc Engine

[App page](https://appshunter.io/ios/app/calc-engine/id1061766849)

A highly customizable calculator with advanced features like graphing, equation solving, and unit conversion. Design your own keyboards and functions to streamline your workflow across Apple devices.

**Highlights:** Customizable keyboard layouts, User-defined functions and constants, Live equation graphing, Equation solving, Extensive unit conversions, Programmer mode (hex, binary, octal), Cross-device syncing

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calc Engine+ | $9.99 | one-time |


### 每日一毒Watch版

[App page](https://appshunter.io/ios/app/watch/id6472163444)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Calc Engine free?

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

### Is 每日一毒Watch版 free?

每日一毒Watch版 is free to download, with no in-app purchases.

### Do Calc Engine or 每日一毒Watch版 have ads?

Neither Calc Engine nor 每日一毒Watch版 shows ads.

### Which is updated more often, Calc Engine or 每日一毒Watch版?

Calc Engine ships an update daily, and 每日一毒Watch版 every 4 days. Most recently, Calc Engine was updated on November 13, 2026 and 每日一毒Watch版 on November 12, 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.*