# SigTrax vs Smith Charts

The clearest difference is in-app purchases: Smith Charts at none against SigTrax's 2. Smith Charts also leads on update cadence (every 3 weeks vs every 3 months) and chart position (#199 vs unranked). SigTrax's advantage is price ($2.99 vs $3.99). On rating, review sentiment, ratings volume and ads there is nothing between them.

SigTrax costs $2.99 and Smith Charts $3.99 up front. SigTrax sells 2 one-off in-app purchases. Smith Charts asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.6 for SigTrax against 3.7 for Smith Charts. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews are what separate them: 60% of SigTrax's written reviews are positive against 67% of Smith Charts's.

SigTrax ships an update every 3 months, Smith Charts every 3 weeks. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SigTrax | Smith Charts |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| Rating | [3.6 (8 ratings)](https://appshunter.io/ios/app/sigtrax/id714920367/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews)** |
| Number of ratings | **8** | 3 |
| Positive reviews | 60.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#199** |
| Size | 5 MB | 24 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Amcept, LLC](https://appshunter.io/developer/714920370) | [Edoardo Orzes](https://appshunter.io/developer/1665361246) |

## What reviewers say

### SigTrax

[App page](https://appshunter.io/ios/app/sigtrax/id714920367)

This app helps users locate signal origins by plotting bearings and identifying intersection points. It simplifies the tracking process with mobile device capabilities, offering features like automatic Crosspoint calculation and driving directions to identified locations.

**Highlights:** Plot bearings and determine Crosspoints, High precision GPS locating, Handheld mapping, Automatic Crosspoint management, Driving maps with voice routing, Archive and retrieve bearing collections

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SigShare | $1.99 | one-time |
| DataTrax | $5.99 | one-time |


### Smith Charts

[App page](https://appshunter.io/ios/app/smith-charts/id1602503719)

**Currently charting:** #199 Top Paid · Productivity (US App Store)

Design matching networks, analyze device parameters, and compute stability circles with this interactive tool. Supports S parameters, various components, and offers advanced engineering features for RF design. Available in dark mode and exportable to PDF.

**Highlights:** Interactive Smith chart with drag and zoom, Design matching networks with various components, Compute stability, equi gain, and noise circles, Import S parameters from Touchstone files, Export designs to PDF, image, or file, Dark mode support, Ruler for wavelength measurement

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

**In-app purchases:** none


## Frequently asked questions

### Is SigTrax free?

SigTrax costs $2.99, and also offers in-app purchases.

### Is Smith Charts free?

Smith Charts costs $3.99, with no in-app purchases.

### Which has better reviews, SigTrax or Smith Charts?

Smith Charts is rated higher. SigTrax averages 3.6 out of 5 from 8 ratings, while Smith Charts averages 3.7 from 3 ratings.

### Do SigTrax or Smith Charts have ads?

Neither SigTrax nor Smith Charts shows ads.

### Which is updated more often, SigTrax or Smith Charts?

SigTrax ships an update every 3 months, and Smith Charts every 3 weeks. Most recently, SigTrax was updated on October 6, 2026 and Smith Charts on October 8, 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.*