# iSPEX vs WaterLinx | Citizen Science

The clearest difference is update cadence: iSPEX at every 2 months against WaterLinx | Citizen Science's every 7 months. WaterLinx | Citizen Science's advantage is iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

iSPEX ships an update every 2 months, WaterLinx | Citizen Science every 7 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | iSPEX | WaterLinx | Citizen Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/ispex/id584360175/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | — |
| Size | 5 MB | 55 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DDQ](https://appshunter.io/developer/418328467) | [SPOTTERON Gmbh](https://appshunter.io/developer/1378099707) |

## What reviewers say

### iSPEX

[App page](https://appshunter.io/ios/app/ispex/id584360175)

This educational tool analyzes light entering a smartphone, breaking it down by spectrum and polarization. It requires a specific hardware add-on to function.

**Highlights:** Spectrum analysis, Polarization analysis, Hardware add-on integration, Educational tool

**In-app purchases:** none


### WaterLinx | Citizen Science

[App page](https://appshunter.io/ios/app/waterlinx-citizen-science/id6447082468)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSPEX free?

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

### Is WaterLinx | Citizen Science free?

WaterLinx | Citizen Science is free to download, with no in-app purchases.

### Do iSPEX or WaterLinx | Citizen Science have ads?

Neither iSPEX nor WaterLinx | Citizen Science shows ads.

### Which is updated more often, iSPEX or WaterLinx | Citizen Science?

iSPEX ships an update every 2 months, and WaterLinx | Citizen Science every 7 months. Most recently, iSPEX was updated on November 1, 2026 and WaterLinx | Citizen Science 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.*