# FileFlex vs LSI Calculator

The clearest difference is rating: FileFlex at 4.9 against LSI Calculator's 4.4. FileFlex also leads on ratings volume (27 vs 5). LSI Calculator's advantage is update cadence (every 2 months vs every 5 months) and iOS requirement (11.0 vs 14.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

FileFlex holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: FileFlex has 27 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 95% of FileFlex's written reviews are positive against 100% of LSI Calculator's, so the app with the better star average is not the one people write more warmly about.

FileFlex ships an update every 5 months, LSI Calculator every 2 months. The most recent releases landed on June 1, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | FileFlex | LSI Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (27 ratings)](https://appshunter.io/ios/app/fileflex/id982214370/reviews)** | [4.4 (5 ratings)](https://appshunter.io/ios/app/lsi-calculator/id1233049990/reviews) |
| Number of ratings | **27** | 5 |
| Positive reviews | 94.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 2 MB | 52 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Qnext Corp.](https://appshunter.io/developer/375669286) | [Pure Planet Science & Technology, Inc.](https://appshunter.io/developer/1234693265) |

## What reviewers say

### FileFlex

[App page](https://appshunter.io/ios/app/fileflex/id982214370)

Access, share, and stream your files, pictures, music, and videos from any device without uploading to the cloud. Manage your content remotely across multiple storage locations securely from behind your own firewall.

**Highlights:** Remote file access from source locations, Secure file sharing without uploads, Media streaming from storage, Remote multi-location file management, Access from any internet-connected device

**In-app purchases:** none


### LSI Calculator

[App page](https://appshunter.io/ios/app/lsi-calculator/id1233049990)

This app provides tools and educational resources to help users manage water systems, focusing on eco-friendly treatments for pools and spas. It aims to make water maintenance accessible to everyone, regardless of their experience level.

**Highlights:** Water science education, Pool and spa water management, Eco-friendly treatment guidance, NSF/ANSI Certified product information, Tools for water system management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FileFlex free?

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

### Is LSI Calculator free?

LSI Calculator is free to download, with no in-app purchases.

### Which has better reviews, FileFlex or LSI Calculator?

FileFlex is rated higher. FileFlex averages 4.9 out of 5 from 27 ratings, while LSI Calculator averages 4.4 from 5 ratings.

### Do FileFlex or LSI Calculator have ads?

Neither FileFlex nor LSI Calculator shows ads.

### Which is updated more often, FileFlex or LSI Calculator?

FileFlex ships an update every 5 months, and LSI Calculator every 2 months. Most recently, FileFlex was updated on June 1, 2026 and LSI Calculator on June 11, 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.*