# Tabi Calc vs DarkBOX

The clearest difference is in-app purchases: DarkBOX at none against Tabi Calc's 3. DarkBOX also leads on iOS requirement (9.0 vs 17.0). Tabi Calc's advantage is update cadence (fortnightly vs every 6 weeks). On price, ads 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. DarkBOX asks for nothing beyond the download.

Tabi Calc ships an update fortnightly, DarkBOX every 6 weeks. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Tabi Calc | DarkBOX |
| --- | --- | --- |
| 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 | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 10 MB | 7 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tsuyoshi Niwa](https://appshunter.io/developer/888556976) | [Foshan Sanmak Lighting](https://appshunter.io/developer/1276059187) |

## 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 |
| 6 month subscription | $4.49 | per 6 months |
| Yearly Subscription | $7.99 | per year |


### DarkBOX

[App page](https://appshunter.io/ios/app/darkbox/id1557203495)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tabi Calc free?

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

### Is DarkBOX free?

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

### Do Tabi Calc or DarkBOX have ads?

Neither Tabi Calc nor DarkBOX shows ads.

### Which is updated more often, Tabi Calc or DarkBOX?

Tabi Calc ships an update fortnightly, and DarkBOX every 6 weeks. Most recently, Tabi Calc was updated on October 8, 2026 and DarkBOX on October 11, 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.*