# Spill Calc Lite vs SurfaceOps by uAvionix

The clearest difference is update cadence: SurfaceOps by uAvionix at every 2 weeks against Spill Calc Lite's every 16 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Spill Calc Lite ships an update every 16 months, SurfaceOps by uAvionix every 2 weeks. The most recent releases landed on October 20, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Spill Calc Lite | SurfaceOps by uAvionix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spill-calc-lite/id1089421597/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 5 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Gayneaux](https://appshunter.io/developer/1082576429) | [CAVU Consulting LLC](https://appshunter.io/developer/1884389605) |

## What reviewers say

### Spill Calc Lite

[App page](https://appshunter.io/ios/app/spill-calc-lite/id1089421597)

Quickly estimate surface spill volumes in the field with this tool. Calculate for square, rectangular, circular, and triangular spills, with options for tank displacement. Features a clean interface and helpful library for efficient on-site calculations.

**Highlights:** Estimate surface spill volumes, Calculate for square, rectangular, circular, and triangular spills, Optional tank displacement calculation, Immediate results in barrels and gallons, Clean and modern interface, Easy-to-use Help Library

**Features:** macOS Compatibility

**In-app purchases:** none


### SurfaceOps by uAvionix

[App page](https://appshunter.io/ios/app/surfaceops-by-uavionix/id6762227397)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Spill Calc Lite free?

Spill Calc Lite is free to download, with no in-app purchases.

### Is SurfaceOps by uAvionix free?

SurfaceOps by uAvionix is free to download, with no in-app purchases.

### Do Spill Calc Lite or SurfaceOps by uAvionix have ads?

Neither Spill Calc Lite nor SurfaceOps by uAvionix shows ads.

### Which is updated more often, Spill Calc Lite or SurfaceOps by uAvionix?

Spill Calc Lite ships an update every 16 months, and SurfaceOps by uAvionix every 2 weeks. Most recently, Spill Calc Lite was updated on October 20, 2026 and SurfaceOps by uAvionix on October 18, 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.*