LSPIV vs Center Joint USD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LSPIV
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.
- Large-scale particle image velocimetry
- Water surface velocity measurement
- Non-intrusive velocimetry
- Smartphone implementation
- Instant ortho-rectification
- No GCPs required
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LSPIV (large-scale particle image velocimetry) is an image-based method for measuring velocity distribution on the water surface. Applications of LSPIV have been increasing for both field and laboratory experiments as unique and powerful tools for non-intrusive velocimetry using conventional imaging devices and specialized image processing software. This app utilizes a smartphone to implement LSPIV. By innovatively combining the sensors embedded in smartphones, the images captured with them can be intrinsically and instantly ortho-rectified without making recourse to GCPs. The app was developed under support by the River Fund in charge of the Foundation of River and Watershed Environment Management (FOREM), Japan; Grant-in-Aid for Young Scientists (B); and the Research Fund of Japan Institute of Country-ology and Engineering.
Center Joint USD
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.
- District and school information
- Filter by child's school
- Announcements
- Contact details
- Staff directory
- Event calendar
- Push notifications
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The app includes information for the district and all schools. Filter by the school your child attends to feature information for that school. Key information includes: • Announcements • Contact Details • Staff Directory • Event Calendar Additional resources may be provided by the district or school, such as: • bus routes • board agendas • lunch menus • Aeries & MySchoolBucks login links • sports information • and more App users may opt to receive push notifications with important alerts from the district.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | LSPIV | Center Joint USD |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.7 (3 ratings) |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 13 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 71 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryota Tsubaki | Catapult K12 |
Customer experience
LSPIV
Center Joint USD
In-app purchases
LSPIV
No in-app purchases
Center Joint USD
No in-app purchases
Questions
Is LSPIV free?
Is Center Joint USD free?
Which has better reviews, LSPIV or Center Joint USD?
Do LSPIV or Center Joint USD have ads?
Which is updated more often, LSPIV or Center Joint USD?
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