Comparison

LSPIV vs Center Joint USD

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Large-scale particle image velocimetry
  • Water surface velocity measurement
  • Non-intrusive velocimetry
  • Smartphone implementation
  • Instant ortho-rectification
  • No GCPs required
Features
Read full description

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.

About

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.

Highlights
  • District and school information
  • Filter by child's school
  • Announcements
  • Contact details
  • Staff directory
  • Event calendar
  • Push notifications
Features
Read full description

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

LSPIV1 screens
Center Joint USD4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 5 level
LSPIV versus Center Joint USD: the parameters behind the verdict, then further details
ParameterLSPIVCenter Joint USD
PriceFreeFree
Rating5.0 (1 ratings) — better3.7 (3 ratings)
Number of ratings13 — better
Update frequencyEvery 13 monthsEvery 5 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better13.4
Further details — not scored
Size71 MB26 MB
Age rating4+4+
DeveloperRyota TsubakiCatapult K12

Customer experience

LSPIV

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Center Joint USD

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

LSPIV

No in-app purchases

None

Center Joint USD

No in-app purchases

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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