# TCI Bitacora vs Polygon

The clearest difference is in-app purchases: TCI Bitacora at none against Polygon's 4. TCI Bitacora also leads on iOS requirement (11.0 vs 17.0). Polygon's advantage is update cadence (weekly vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Polygon sells 4 in-app purchases, starting at $2.99 per month. TCI Bitacora asks for nothing beyond the download.

TCI Bitacora ships an update fortnightly, Polygon weekly. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | TCI Bitacora | Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Freemium |
| Size | 45 MB | 29 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Armando Montellano](https://appshunter.io/developer/1455567990) | [Adrian Caballero](https://appshunter.io/developer/1635287590) |

## What reviewers say

### TCI Bitacora

[App page](https://appshunter.io/ios/app/tci-bitacora/id1464209780)

**Features:** macOS Compatibility

**In-app purchases:** none


### Polygon

[App page](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285)

Calculate complex properties of any polygonal figure, including centroids, moments of inertia, and perimeter. Simply input vertex coordinates for instant results, saving significant time on tedious calculations.

**Highlights:** Polygon Centroids, Moments of Inertia (Ix, Iy, Ixy), Polar Moment of Inertia, Radius of Gyration, Principal Moments of Inertia, Area and Perimeter, Side Lengths, Hollow Sections

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $2.99 | per month |
| Pro Access | $4.99 | per 6 months |
| Pro Access | $6.99 | per year |
| Pro Access | $9.99 | one-time |


## Frequently asked questions

### Is TCI Bitacora free?

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

### Is Polygon free?

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

### Do TCI Bitacora or Polygon have ads?

Neither TCI Bitacora nor Polygon shows ads.

### Which is updated more often, TCI Bitacora or Polygon?

TCI Bitacora ships an update fortnightly, and Polygon weekly. Most recently, TCI Bitacora was updated on October 26, 2026 and Polygon on October 30, 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.*