Secchi vs Floating Weeds
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Secchi
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Climate change is threatening the phytoplankton that underpins the marine food chain. We must understand why before it's too late. Secchi enables you to take part in the Secchi Disk citizen science study and help collect essential data on the phytoplankton.
Floating Weeds
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Floating weeds choke canals and damage ecosystems. With the Floating Weeds app, your sightings help guide real-world solutions and satellite science.
Screenshots
Verdict
Secchi and Floating Weeds are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Secchi ships an update every 7 months, Floating Weeds every 12 months. Both last shipped on October 10, 2026.
| Parameter | Secchi | Floating Weeds |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 45 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | The Secchi Disk Foundation | Centre for Ecology and Hydrology |
In-app purchases
Secchi
No in-app purchases
Floating Weeds
No in-app purchases
Questions
Is Secchi free?
Is Floating Weeds free?
Do Secchi or Floating Weeds have ads?
Which is updated more often, Secchi or Floating Weeds?
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