# Indo Center vs Progressive Identifier for ECP

The clearest difference is review sentiment: Indo Center at 100% against Progressive Identifier for ECP's 0%. Indo Center also leads on in-app purchases (none vs 2) and update cadence (every 6 months vs every 14 months). On price, ads and device support there is nothing between them.

Both are free to download. Progressive Identifier for ECP sells 2 in-app purchases, starting at $4.99 per month. Indo Center asks for nothing beyond the download.

Indo Center ships an update every 6 months, Progressive Identifier for ECP every 14 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Indo Center | Progressive Identifier for ECP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (36 ratings)](https://appshunter.io/ios/app/progressive-identifier-for-ecp/id1365601702/reviews)** |
| Number of ratings | — | **36** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 14 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 20 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Indo Optical S.L.](https://appshunter.io/developer/1255492159) | [Lens Shapers](https://appshunter.io/developer/1279463389) |

## What reviewers say

### Indo Center

[App page](https://appshunter.io/ios/app/indo-center/id657080886)

This medical application uses advanced hardware and software to automatically measure all necessary parameters for fitting ophthalmic lenses to spectacle frames. It provides precise measurements for interpupillary distance, mounting heights, lens diameters, and more, ensuring accurate lens adaptation.

**Highlights:** Pupillary centering system, Automatic parameter measurement, Compatible with all lens brands, Measures interpupillary distance, Calculates mounting heights, Determines lens diameters, Provides vertex distance

**Features:** macOS Compatibility

**In-app purchases:** none


### Progressive Identifier for ECP

[App page](https://appshunter.io/ios/app/progressive-identifier-for-ecp/id1365601702)

This app helps identify progressive lenses by their engravings or names. It provides detailed information on over 1200 lenses, including availability, materials, and fitting heights. Search visually or by text for engravings and lens details.

**Highlights:** Identify lenses by engraving or name, Detailed lens information (materials, fitting height), Search engravings visually or by text, Over 1200 lenses and engravings, Data for USA, Canada, Germany, UK, Includes digital, therapeutic, and anti-fatigue lenses

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $49.99 | per year |


## Frequently asked questions

### Is Indo Center free?

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

### Is Progressive Identifier for ECP free?

Progressive Identifier for ECP is free to download, with in-app purchases available.

### Do Indo Center or Progressive Identifier for ECP have ads?

Neither Indo Center nor Progressive Identifier for ECP shows ads.

### Which is updated more often, Indo Center or Progressive Identifier for ECP?

Indo Center ships an update every 6 months, and Progressive Identifier for ECP every 14 months. Most recently, Indo Center was updated on October 23, 2026 and Progressive Identifier for ECP on October 24, 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.*