# ERLUS Profi vs 4Memo

The clearest difference is price: ERLUS Profi at Free against 4Memo's $0.99. ERLUS Profi also leads on in-app purchases (none vs 4) and iOS requirement (15.0 vs 17.6). 4Memo's advantage is review sentiment (77% vs 67%). On update cadence, ads and device support there is nothing between them.

ERLUS Profi is free to download; 4Memo costs $0.99 up front. 4Memo sells 4 one-off in-app purchases. ERLUS Profi asks for nothing beyond the download.

ERLUS Profi ships an update every 4 months, 4Memo every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | ERLUS Profi | 4Memo |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/4memo/id964039336/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 66.7% of reviews | **77.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [ERLUS AG](https://appshunter.io/developer/1113943917) | [Florian Schimanke](https://appshunter.io/developer/288399510) |

## What reviewers say

### ERLUS Profi

[App page](https://appshunter.io/ios/app/erlus-profi-app-dach/id952643496)

This tool assists professional roofers by allowing them to create and manage construction projects, select roofing tiles, and perform precise calculations for wind load, snow protection, and material quantities. It guides users through data input and offers PDF exports for project summaries and product details.

**Highlights:** Create and manage construction projects, Select appropriate roofing tiles, Calculate material quantities, Determine wind load safety, Calculate snow protection systems, Export project summaries as PDF

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

**In-app purchases:** none


### 4Memo

[App page](https://appshunter.io/ios/app/4memo/id964039336)

Effortlessly record and send voice memos with minimal steps. Protect your privacy as recordings are processed solely on your device. Integrates with Apple Watch and Siri Shortcuts for enhanced convenience.

**Highlights:** One-tap sending to pre-set recipients, Privacy-focused, on-device processing, Apple Watch integration, Siri Shortcuts support, Email attachment of voice memos

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Siri Shortcuts | $0.99 | one-time |
| Transcription | $0.99 | one-time |
| Apple Watch Extension | $1.99 | one-time |
| All Premium Features | $2.99 | one-time |


## Frequently asked questions

### Is ERLUS Profi free?

ERLUS Profi is free to download, with no in-app purchases.

### Is 4Memo free?

4Memo costs $0.99, and also offers in-app purchases.

### Do ERLUS Profi or 4Memo have ads?

Neither ERLUS Profi nor 4Memo shows ads.

### Which is updated more often, ERLUS Profi or 4Memo?

ERLUS Profi ships an update every 4 months, and 4Memo every 3 months. Most recently, ERLUS Profi was updated on November 1, 2026 and 4Memo 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.*