# Tabi Calc vs 雙重驗證

The clearest difference is in-app purchases: 雙重驗證 at none against Tabi Calc's 3. 雙重驗證 also leads on ads (none vs shown) and iOS requirement (14.1 vs 17.0). Tabi Calc's advantage is update cadence (every 3 weeks vs every 8 months). On price and device support there is nothing between them.

Both are free to download. Tabi Calc sells 3 in-app purchases, starting at $0.99 per month. 雙重驗證 asks for nothing beyond the download.

Tabi Calc ships an update every 3 weeks, 雙重驗證 every 8 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Tabi Calc | 雙重驗證 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (40 ratings)](https://appshunter.io/ios/app/tabi-calc/id1246912834/reviews)** | — |
| Number of ratings | **40** | — |
| Positive reviews | 43.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 0 MB |
| Requires iOS | 17.0 | **14.1** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Tsuyoshi Niwa](https://appshunter.io/developer/888556976) | [Meng-Yuan Huang](https://appshunter.io/developer/1526621891) |

## What reviewers say

### Tabi Calc

[App page](https://appshunter.io/ios/app/tabi-calc/id1246912834)

This app is a travel-focused calculator that simplifies date, time, and currency calculations. It helps users plan trips, manage itineraries, and convert currencies with live or offline rates. Designed for travelers, it offers an intuitive interface and accurate results.

**Highlights:** Date and time difference calculations, Add/subtract days, months, years from dates, Multi-currency converter with live/offline rates, Supports over 160 currencies, Location-based currency suggestions, Offline currency rate support, Saves recent calculations

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Yearly Subscription | $9.99 | per year |
| Lifetime Pro | $39.99 | one-time |


### 雙重驗證

[App page](https://appshunter.io/ios/app/id1580807295)

**In-app purchases:** none


## Frequently asked questions

### Is Tabi Calc free?

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

### Is 雙重驗證 free?

雙重驗證 is free to download, with no in-app purchases.

### Do Tabi Calc or 雙重驗證 have ads?

Tabi Calc shows ads; 雙重驗證 does not.

### Which is updated more often, Tabi Calc or 雙重驗證?

Tabi Calc ships an update every 3 weeks, and 雙重驗證 every 8 months. Most recently, Tabi Calc was updated on November 2, 2026 and 雙重驗證 on October 30, 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.*