# LSPIV vs DoodleConnect

The clearest difference is update cadence: DoodleConnect at every 2 months against LSPIV's every 13 months. DoodleConnect also leads on ratings volume (56 vs 1). LSPIV's advantage is rating (5.0 vs 4.7) and iOS requirement (11.0 vs 15.0). 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 4.7. That said, the two scores are not equally well evidenced: DoodleConnect has 56 ratings behind it against 1, so its average is the more settled of the two.

LSPIV ships an update every 13 months, DoodleConnect every 2 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | LSPIV | DoodleConnect |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lspiv/id981387743/reviews)** | [4.7 (56 ratings)](https://appshunter.io/ios/app/doodleconnect/id1176073180/reviews) |
| Number of ratings | 1 | **56** |
| Positive reviews | — | 56.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 71 MB | 37 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ryota Tsubaki](https://appshunter.io/developer/981387742) | [Discovery Education Inc.](https://appshunter.io/developer/1557216359) |

## 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


### DoodleConnect

[App page](https://appshunter.io/ios/app/doodleconnect/id1176073180)

Monitor your child's educational development across multiple learning applications. Stay informed about their achievements, progress through the curriculum, and receive real-time updates on their learning journey.

**Highlights:** Instant progress notifications, View latest achievements, Track stars earned, Follow curriculum progress

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

**In-app purchases:** none

**What reviewers like**

- 👍 Great for tracking progress
- 👍 Makes learning fun
- 👍 Interactive and engaging
- 👍 Good for home education
- 👍 Provides insightful data

**What reviewers complain about**

- 🐛 Glitches and bugs
- 🐛 App crashes/switches off
- 🐛 Syncing issues between devices
- 🐛 Not synching with Doodle Connect
- 🐛 Latest update ruined app

**Reported bugs**

- Losing streak
- No synching between apps on different devices
- Not synching with Doodle Connect app
- Latest update ruined the app
- Can't understand children's results anymore

**Requested features**

- Bring back old version
- More comprehensive initial test
- More challenging levels
- Option to add extra material for all students
- Better graphing options


## Frequently asked questions

### Is LSPIV free?

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

### Is DoodleConnect free?

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

### Which has better reviews, LSPIV or DoodleConnect?

LSPIV is rated higher. LSPIV averages 5.0 out of 5 from 1 ratings, while DoodleConnect averages 4.7 from 56 ratings.

### Do LSPIV or DoodleConnect have ads?

Neither LSPIV nor DoodleConnect shows ads.

### Which is updated more often, LSPIV or DoodleConnect?

LSPIV ships an update every 13 months, and DoodleConnect every 2 months. Most recently, LSPIV was updated on October 22, 2026 and DoodleConnect on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*