# Proposal Writer 4 vs ECO Battery

The clearest difference is rating: Proposal Writer 4 at 5.0 against ECO Battery's 4.0. ECO Battery's advantage is update cadence (fortnightly vs every 9 months) and ratings volume (22 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Proposal Writer 4 holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: ECO Battery has 22 ratings behind it against 1, so its average is the more settled of the two.

Proposal Writer 4 ships an update every 9 months, ECO Battery fortnightly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Proposal Writer 4 | ECO Battery |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/proposal-writer-4/id942538207/reviews)** | [4.0 (22 ratings)](https://appshunter.io/ios/app/eco-battery/id6474708780/reviews) |
| Number of ratings | 1 | **22** |
| Positive reviews | — | 63.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 3 MB | 31 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Carlisle Construction Materials Incorporated](https://appshunter.io/developer/557896327) | [Eco Capital, Inc.](https://appshunter.io/developer/1722379141) |

## What reviewers say

### Proposal Writer 4

[App page](https://appshunter.io/ios/app/proposal-writer-4/id942538207)

This app helps roofing professionals conduct rooftop inspections and generate professional reports for clients. It allows for detailed documentation of roof conditions, features, and necessary repairs, streamlining the proposal process.

**Highlights:** Generate rooftop inspection reports, Capture and import photos, Import satellite imagery for site maps, Document rooftop conditions and repairs, Access suggested solutions, Include cover letters and specifications

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

**In-app purchases:** none


### ECO Battery

[App page](https://appshunter.io/ios/app/eco-battery/id6474708780)

Monitor and manage your lithium battery's health and performance. Optimize charging and discharging cycles to extend battery lifespan. Get detailed insights into your battery's status.

**Highlights:** Lithium battery management, BMS monitoring, Performance optimization, Charging cycle control, Discharging cycle control, Battery health insights

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Proposal Writer 4 free?

Proposal Writer 4 is free to download, with no in-app purchases.

### Is ECO Battery free?

ECO Battery is free to download, with no in-app purchases.

### Which has better reviews, Proposal Writer 4 or ECO Battery?

Proposal Writer 4 is rated higher. Proposal Writer 4 averages 5.0 out of 5 from 1 ratings, while ECO Battery averages 4.0 from 22 ratings.

### Do Proposal Writer 4 or ECO Battery have ads?

Neither Proposal Writer 4 nor ECO Battery shows ads.

### Which is updated more often, Proposal Writer 4 or ECO Battery?

Proposal Writer 4 ships an update every 9 months, and ECO Battery fortnightly. Most recently, Proposal Writer 4 was updated on November 6, 2026 and ECO Battery on November 4, 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.*