# LSPIV vs Center Joint USD

The clearest difference is rating: LSPIV at 5.0 against Center Joint USD's 3.7. LSPIV also leads on iOS requirement (11.0 vs 13.4). Center Joint USD's advantage is update cadence (every 5 months vs every 13 months) and ratings volume (3 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.

LSPIV holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

LSPIV ships an update every 13 months, Center Joint USD every 5 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | LSPIV | Center Joint USD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lspiv/id981387743/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/center-joint-usd/id1500475876/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 71 MB | 26 MB |
| Requires iOS | **11.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryota Tsubaki](https://appshunter.io/developer/981387742) | [Catapult K12](https://appshunter.io/developer/1449934270) |

## What reviewers say

### LSPIV

[App page](https://appshunter.io/ios/app/lspiv/id981387743)

This application enables large-scale particle image velocimetry (LSPIV) using a smartphone. It offers a non-intrusive method for measuring water surface velocity distribution in both field and lab settings. The app provides instant ortho-rectification of captured images without needing ground control points.

**Highlights:** Large-scale particle image velocimetry, Water surface velocity measurement, Non-intrusive velocimetry, Smartphone implementation, Instant ortho-rectification, No GCPs required

**Features:** macOS Compatibility

**In-app purchases:** none


### Center Joint USD

[App page](https://appshunter.io/ios/app/center-joint-usd/id1500475876)

This app provides essential information for a school district and its individual schools. Users can filter content by their child's school to access announcements, contact details, staff directories, and event calendars. It also offers links to resources like bus routes, board agendas, and lunch menus.

**Highlights:** District and school information, Filter by child's school, Announcements, Contact details, Staff directory, Event calendar, Push notifications

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LSPIV free?

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

### Is Center Joint USD free?

Center Joint USD is free to download, with no in-app purchases.

### Which has better reviews, LSPIV or Center Joint USD?

LSPIV is rated higher. LSPIV averages 5.0 out of 5 from 1 ratings, while Center Joint USD averages 3.7 from 3 ratings.

### Do LSPIV or Center Joint USD have ads?

Neither LSPIV nor Center Joint USD shows ads.

### Which is updated more often, LSPIV or Center Joint USD?

LSPIV ships an update every 13 months, and Center Joint USD every 5 months. Most recently, LSPIV was updated on November 1, 2026 and Center Joint USD on November 3, 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.*