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I use iNaturalist for plants and animals, mostly insects (and Merlin for birdsong recognition).

No ads, non-profit, contribute to research, etc. It also allows you to find out what others have spotted in your area. I like the range maps, the images across seasons, and other seasonal information.

The actual ML-based recognition is somewhat hidden, I think that part of the UI needs some work; it seems like it was made for researchers first then hacked for non-experts to use.

https://www.inaturalist.org/pages/about

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Besides the utility for users, Flora Incognita is also a massive crowdsourcing project for science: They use the GPS location of photos in combination with the identified plants to build a temporo-spatial database of confirmed plant sightings. (To my knowledge no link to any personal data of users.)
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It is a pity that, while their focus is on openness and accessiblity, neither Flora Incognita, nor iNaturalist or PlantNet can be installed from the F-Droid appstore. I unfortunately don't use Google Play, so can't testdrive them.
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Flora Incognita and PlantNet are not open source, so they cannot be published to F-Droid. However, iNaturalist is and the apk can be directly installed from the GitHub releases page.

https://github.com/inaturalist/iNaturalistAndroid/releases

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I find it very weird that a free app coming from a university would not be open source...
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I'm going to use Flora Incognita if only because it's a 29MB download so even if it's offloaded, it won't kill me to retrieve it.

Seek is 220MB...

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Thank you for the rec, I used it to identify a mystery house plant I was gifted :)
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Better than PlantNet?
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PlantNet covers everything, Flora is more central Europe focused and has a hard time with non-native plants.
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I live next to a botanical garden which has climate-regulated glass domes with all sorts of non-native plants from around the world and it gets 90%+ of them right, but sometime you have to feed it different parts of the plant. PlantNet does look great too, I’ll have to check it out!
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That's a nice anecdote, but I didn't just make up this fact. According to their paper [1], Flora has 4851 supported species, while PlantNet covered 30,261 at the time. Flora also tends to mix up cultivated/ornamental plants with wild counterparts, so your perceived accuracy may be deceptive if you're not a botanist. So yes, it's a cute app if you are a walking outside in central Europe, but it's nowhere near PlantNet.

[1] https://besjournals.onlinelibrary.wiley.com/doi/10.1111/2041...

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Looks like they've both added a lot since then. If I select their worldwide species list in app, I get 38k for Flora and 85k for PlantNet.

I just gave them a try for some common trees around Costa Rica that I'm confident in identifying, and they both did very well, slightly better than PictureThis and iNaturalist, which I've been using for a while.

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PlantNet seems pretty open as well right? Looks like is from several public institutions so it should be ads and trackers free, can you confirm?
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I don't recall running into ads, don't know about trackers. PlantNet hasn't triggered any red flags for myself.
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+1 for Flora Incognita. This is what apps should be.
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How does it compare to iNaturalist or observation.org which are like the 'standard' ones?
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PictureThis is an old favorite and still works quickly and quite accurately. I believe it’s a Chinese app though so do with that information what you will.
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