# Techline Calculator vs Site Audit One

The clearest difference is in-app purchases: Techline Calculator at none against Site Audit One's 3. Techline Calculator also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). Site Audit One's advantage is update cadence (every 2 weeks vs every 2 months). On price and ads there is nothing between them.

Both are free to download. Site Audit One sells 3 in-app purchases, starting at $4.99 per 7 days. Techline Calculator asks for nothing beyond the download.

Techline Calculator ships an update every 2 months, Site Audit One every 2 weeks. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Techline Calculator | Site Audit One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (7 ratings)](https://appshunter.io/ios/app/techline-calculator/id594292322/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 10 MB | 24 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Visual Impact Technologies Inc.](https://appshunter.io/developer/511035964) | [Secgin LLC](https://appshunter.io/developer/1536282489) |

## What reviewers say

### Techline Calculator

[App page](https://appshunter.io/ios/app/techline-calculator/id594292322)

This app assists with landscape design by providing calculations for project supplies, measurements, and dripline placement. It accounts for variables like soil type, plant needs, and irrigation pressure to determine emitter spacing and irrigated area. Results can be saved and recalculated, ensuring adherence to official standards.

**Highlights:** Landscape design calculations, Project supply estimation, Dripline placement guidance, Irrigated area determination, Pressure and flow rate calculations, Emitter spacing computation, Save and recalculate results

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

**In-app purchases:** none


### Site Audit One

[App page](https://appshunter.io/ios/app/site-audit-one/id6804841729)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Site Audit One Pro Weekly | $4.99 | per 7 days |
| Site Audit One Pro Monthly | $9.99 | per month |
| Site Audit One Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is Techline Calculator free?

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

### Is Site Audit One free?

Site Audit One is free to download, with in-app purchases available.

### Do Techline Calculator or Site Audit One have ads?

Neither Techline Calculator nor Site Audit One shows ads.

### Which is updated more often, Techline Calculator or Site Audit One?

Techline Calculator ships an update every 2 months, and Site Audit One every 2 weeks. Most recently, Techline Calculator was updated on October 23, 2026 and Site Audit One on October 14, 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.*