# SIGMASMITH vs CalcEngineer

The clearest difference is in-app purchases: CalcEngineer at none against SIGMASMITH's 3. CalcEngineer also leads on update cadence (every 2 days vs every 3 weeks). SIGMASMITH's advantage is iOS requirement (15.6 vs 17). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. SIGMASMITH sells 3 one-off in-app purchases. CalcEngineer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for SIGMASMITH against 5.0 for CalcEngineer. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

SIGMASMITH ships an update every 3 weeks, CalcEngineer every 2 days. The most recent releases landed on June 24, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | SIGMASMITH | CalcEngineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/sigmasmith/id6475358569/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/calcengineer/id6748969344/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | Free |
| Size | 64 MB | 10 MB |
| Requires iOS | **15.6** | 17 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Richard Valois](https://appshunter.io/developer/1724050357) | [Justin Bush](https://appshunter.io/developer/1828308327) |

## What reviewers say

### SIGMASMITH

[App page](https://appshunter.io/ios/app/sigmasmith/id6475358569)

This toolkit helps businesses optimize operations by calculating labor costs, tracking error frequency with Pareto charts, and conducting time studies with line balance charts. It provides data-driven insights to enhance productivity and manage resources effectively.

**Highlights:** Efficiency Calculator for labor hours and cost per unit, Error Frequency Tracker with Pareto charts, Time Study tool with line balance charts, Takt Time alignment for demand matching, Data-driven decision making for operations

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Premium For Life | $0.99 | one-time |
| Get Professional For Month | $4.99 | one-time |
| Get Yearly Subscription | $44.99 | one-time |


### CalcEngineer

[App page](https://appshunter.io/ios/app/calcengineer/id6748969344)

This app provides professional engineering calculations for compressed air systems. It helps engineers and technicians determine CFM requirements, size compressors and tanks, and analyze pressure drops for optimized pneumatic systems.

**Highlights:** CFM Calculator, Compressor & Tank Sizing, Pressure Drop Analysis, Flow Velocity & Pipe Sizing, Multiple CFM Entries, General Engineering Calculator Suite

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SIGMASMITH free?

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

### Is CalcEngineer free?

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

### Which has better reviews, SIGMASMITH or CalcEngineer?

SIGMASMITH and CalcEngineer are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do SIGMASMITH or CalcEngineer have ads?

Neither SIGMASMITH nor CalcEngineer shows ads.

### Which is updated more often, SIGMASMITH or CalcEngineer?

SIGMASMITH ships an update every 3 weeks, and CalcEngineer every 2 days. Most recently, SIGMASMITH was updated on June 24, 2026 and CalcEngineer on September 12, 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.*