# ERSB Lite vs Classroom Noise Meter

The clearest difference is update cadence: Classroom Noise Meter at every 2 weeks against ERSB Lite's every 2 months. ERSB Lite's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ERSB Lite sells 5 one-off in-app purchases and Classroom Noise Meter sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ERSB Lite ships an update every 2 months, Classroom Noise Meter every 2 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | ERSB Lite | Classroom Noise Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/ersb-lite/id976322567/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 253 MB | 18 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Attainment Company](https://appshunter.io/developer/403989333) | [Felix Leitenberger](https://appshunter.io/developer/1488329664) |

## What reviewers say

### 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 |


### Classroom Noise Meter

[App page](https://appshunter.io/ios/app/classroom-noise-meter-ruhe/id6817002986)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruhe Pro – Monthly | $1.99 | per month |
| Ruhe Pro – Yearly | $8.99 | per year |
| Ruhe Pro – Lifetime | $22.99 | one-time |


## Frequently asked questions

### Is ERSB Lite free?

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

### Is Classroom Noise Meter free?

Classroom Noise Meter is free to download, with in-app purchases available.

### Do ERSB Lite or Classroom Noise Meter have ads?

Neither ERSB Lite nor Classroom Noise Meter shows ads.

### Which is updated more often, ERSB Lite or Classroom Noise Meter?

ERSB Lite ships an update every 2 months, and Classroom Noise Meter every 2 weeks. Most recently, ERSB Lite was updated on November 1, 2026 and Classroom Noise Meter on November 6, 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.*