# SEC Calculator vs TÜNKERS

The clearest difference is update cadence: TÜNKERS at every 9 months against SEC Calculator's every 27 months. SEC Calculator's advantage is iOS requirement (11.0 vs 15.1). 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.

SEC Calculator ships an update every 27 months, TÜNKERS every 9 months. The most recent releases landed on October 1, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | SEC Calculator | TÜNKERS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 9 months** |
| Monetization | Free | — |
| Size | 32 MB | 25 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Star Refrigeration Ltd](https://appshunter.io/developer/1571289922) | [w63 GmbH](https://appshunter.io/developer/1493647641) |

## What reviewers say

### SEC Calculator

[App page](https://appshunter.io/ios/app/sec-calculator/id1571289919)

This tool assists businesses in assessing energy usage and cost reduction through equipment improvements or new system investments. It calculates potential annual savings and CO2 emission reductions, benchmarks sites against best practices, and generates a personalized PDF report.

**Highlights:** Energy usage assessment, Cost reduction calculation, CO2 emission reduction tracking, Site benchmarking, Personalized PDF reports

**Features:** macOS Compatibility

**In-app purchases:** none


### TÜNKERS

[App page](https://appshunter.io/ios/app/tunkers/id1611226600)

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

**In-app purchases:** none


## Frequently asked questions

### Is SEC Calculator free?

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

### Is TÜNKERS free?

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

### Do SEC Calculator or TÜNKERS have ads?

Neither SEC Calculator nor TÜNKERS shows ads.

### Which is updated more often, SEC Calculator or TÜNKERS?

SEC Calculator ships an update every 27 months, and TÜNKERS every 9 months. Most recently, SEC Calculator was updated on October 1, 2026 and TÜNKERS on October 4, 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.*