# Trigonometric Calculation vs Haikan Pipit

The clearest difference is in-app purchases: Trigonometric Calculation at none against Haikan Pipit's 2. Haikan Pipit's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Haikan Pipit sells 2 in-app purchases, starting at $3.99 per month. Trigonometric Calculation asks for nothing beyond the download.

Trigonometric Calculation ships an update every 6 weeks, Haikan Pipit every 3 weeks. The most recent releases landed on May 16, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Trigonometric Calculation | Haikan Pipit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 220 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Risako Asai](https://appshunter.io/developer/1671273580) | [NETSTILL LIMITED LIABILITY CO.](https://appshunter.io/developer/1718197858) |

## What reviewers say

### Trigonometric Calculation

[App page](https://appshunter.io/ios/app/trigonometric-calculation/id1636196284)

**Features:** macOS Compatibility

**In-app purchases:** none


### Haikan Pipit

[App page](https://appshunter.io/ios/app/haikan-pipit/id6473008995)

Calculate precise cut lengths for various pipe fittings and view their dimensions in a 3D catalog. Supports multiple fitting types with plans for future additions like sharing and quantity estimation.

**Highlights:** Cut length calculation for fitting combinations, 3D pipe catalog with dimension drawings, Support for DV, TS/HI, HT, White-thread, Water Supply Core, Butt-weld, and Stainless Press-Type fittings, Future updates planned for sharing and quantity estimation, View pipe and fitting shapes and dimensions

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プロ版（1ヶ月） | $3.99 | per month |
| プロ版（1年間） | $39.99 | per year |


## Frequently asked questions

### Is Trigonometric Calculation free?

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

### Is Haikan Pipit free?

Haikan Pipit is free to download, with in-app purchases available.

### Do Trigonometric Calculation or Haikan Pipit have ads?

Both Trigonometric Calculation and Haikan Pipit show ads.

### Which is updated more often, Trigonometric Calculation or Haikan Pipit?

Trigonometric Calculation ships an update every 6 weeks, and Haikan Pipit every 3 weeks. Most recently, Trigonometric Calculation was updated on May 16, 2026 and Haikan Pipit on September 22, 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.*