# Main Idea vs ERSB Lite

The clearest difference is review sentiment: Main Idea at 71% against ERSB Lite's 0%. Main Idea also leads on ratings volume (19 vs 3) and device support (3 vs 1). ERSB Lite's advantage is rating (4.0 vs 3.8) and update cadence (every 2 months vs every 3 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Main Idea sells 3 one-off in-app purchases and ERSB Lite sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ERSB Lite holds the better App Store score, 4.0 against 3.8. That said, the two scores are not equally well evidenced: Main Idea has 19 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 71% of Main Idea's written reviews are positive against 0% of ERSB Lite's, so the app with the better star average is not the one people write more warmly about.

Main Idea ships an update every 3 months, ERSB Lite every 2 months. The most recent releases landed on November 2, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Main Idea | ERSB Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (19 ratings)](https://appshunter.io/ios/app/main-idea-sentences/id895683482/reviews) | **[4.0 (3 ratings)](https://appshunter.io/ios/app/ersb-lite/id976322567/reviews)** |
| Number of ratings | **19** | 3 |
| Positive reviews | **71.4% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 22 MB | 253 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Janine Toole](https://appshunter.io/developer/839832427) | [Attainment Company](https://appshunter.io/developer/403989333) |

## What reviewers say

### Main Idea

[App page](https://appshunter.io/ios/app/main-idea-sentences/id895683482)

This app helps children in grades 2-5 develop reading comprehension skills by focusing on identifying the main idea of sentences. It uses a fun, game-like approach with step-by-step learning and rewards to keep kids motivated. Designed by educators, it's suitable for both typical and special needs children.

**Highlights:** Step-by-step skill building, Game-like environment, Frustration-free learning, Reward Center for motivation, Parental review and reporting, Over 600 examples, Designed by teachers and researchers

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to 2 Users | $1.99 | one-time |
| Access All Levels | $2.99 | one-time |
| Up to 10 Users | $2.99 | one-time |


### ERSB Lite

[App page](https://appshunter.io/ios/app/ersb-lite/id976322567)

This app builds early reading skills for students progressing from foundational literacy. It uses systematic instruction and assessments to help individuals read independently, proving effective for those with intellectual disabilities and autism.

**Highlights:** Early literacy skill development, Systematic instruction, Ongoing assessments, Progress to 2nd-grade reading level, Effective for intellectual disabilities, Effective for autism

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Levels 12-16 | $29.99 | one-time |
| Levels 17-21 | $29.99 | one-time |
| Levels 22-26 | $29.99 | one-time |
| Levels 2-6 | $29.99 | one-time |
| Levels 7-11 | $29.99 | one-time |


## Frequently asked questions

### Is Main Idea free?

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

### Is ERSB Lite free?

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

### Which has better reviews, Main Idea or ERSB Lite?

ERSB Lite is rated higher. Main Idea averages 3.8 out of 5 from 19 ratings, while ERSB Lite averages 4.0 from 3 ratings.

### Do Main Idea or ERSB Lite have ads?

Neither Main Idea nor ERSB Lite shows ads.

### Which is updated more often, Main Idea or ERSB Lite?

Main Idea ships an update every 3 months, and ERSB Lite every 2 months. Most recently, Main Idea was updated on November 2, 2026 and ERSB Lite on November 1, 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.*