# OBE Engineering System vs iGrade

The clearest difference is in-app purchases: OBE Engineering System at none against iGrade's 5. OBE Engineering System also leads on iOS requirement (12.0 vs 15.0). iGrade's advantage is update cadence (weekly vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. iGrade sells 5 in-app purchases, starting at $4.99 per month. OBE Engineering System asks for nothing beyond the download.

OBE Engineering System ships an update every 9 months, iGrade weekly. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | OBE Engineering System | iGrade |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (7 ratings)](https://appshunter.io/ios/app/igrade-teacher-test-grader/id6761552153/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 62 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Softzone](https://appshunter.io/developer/1576527087) | [iGrade LLC](https://appshunter.io/developer/1827305933) |

## What reviewers say

### OBE Engineering System

[App page](https://appshunter.io/ios/app/obe-engineering-system/id1668638241)

**Features:** macOS Compatibility

**In-app purchases:** none


### iGrade

[App page](https://appshunter.io/ios/app/igrade-teacher-test-grader/id6761552153)

This AI-powered tool assists educators by grading student papers from photographs. It handles various question types, flags uncertain answers for review, and summarizes class performance. Prioritizing privacy, it masks student data locally and deletes images post-grading.

**Highlights:** Reads handwritten answers from photos, Grades multiple choice, fill-in-the-blank, short answer, and free response, Flags uncertain answers for review, Summarizes class performance, Exports results as CSV, Masks student data locally for privacy

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iGrade Starter Monthly | $4.99 | per month |
| iGrade Premium Monthly | $9.99 | per month |
| iGrade Starter Annual | $49.99 | per year |
| iGrade Premium Annual | $99.99 | per year |
| iGrade Paper Pack | $5.99 | one-time |


## Frequently asked questions

### Is OBE Engineering System free?

OBE Engineering System is free to download, with no in-app purchases.

### Is iGrade free?

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

### Do OBE Engineering System or iGrade have ads?

Neither OBE Engineering System nor iGrade shows ads.

### Which is updated more often, OBE Engineering System or iGrade?

OBE Engineering System ships an update every 9 months, and iGrade weekly. Most recently, OBE Engineering System was updated on October 27, 2026 and iGrade on October 28, 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.*