comparison
October 26, 2026 · 10 min read
Free Plant Identifier Apps With No Subscription or Trial
Four plant identifier apps let you identify a houseplant without entering a card or starting a trial. GreenThumb is free with a one-time $3.99 option to remove ads and needs no account. Seek by iNaturalist and Flora Incognita are free with no paywall and no sign-up. Pl@ntNet is a free citizen-science app run by French public research bodies. PictureThis, by contrast, sells its Pro tier through a free trial that renews automatically.
Which free plant identifier apps don't ask for a card or a trial?
You point your phone at a plant, and before you see a name, a screen asks you to "start your free trial." That's the moment most people want to avoid. The good news: you don't have to. These four apps identify plants with no card on file and no trial clock running.
GreenThumb identifies common houseplants on your phone and reminds you when to water, feed and repot [1]. There's no account, no subscription and no trial [1]. The free app includes everything: identification, care reminders and growth logs. It shows a banner in My Plants and an occasional ad after an identification, and a single $3.99 purchase removes the ads for good [1]. That's the only purchase in the app [1]. It's on Google Play now, and the iOS version is coming soon [1].
Seek by iNaturalist is free, and iNaturalist says there are no subscriptions or other paywalls [2]. Seek doesn't require registration and doesn't collect user data by default [3]. You can sign in with an iNaturalist account if you want to, but you don't have to [3].
Flora Incognita says its app is completely free of charge and free of advertising [4]. You don't need a profile to identify plants; a profile is only for syncing observations between devices [4]. It's a research project led from Technische Universität Ilmenau and the Max Planck Institute for Biogeochemistry [4].
Pl@ntNet is listed as free on the App Store, published by Cirad-France [5]. The project describes itself as citizen science, and the photos users take are collected and analysed by scientists [5]. Its trademark is owned by four French public research institutes (CIRAD, INRAE, INRIA and IRD), and it asks for donations to stay open and free [6].
At a glance
| App | Cost | Card or trial to start | Account | Best for |
|---|---|---|---|---|
| GreenThumb | Free with ads; $3.99 once removes ads | No | None | Common houseplants plus care reminders, Android [1] |
| Seek by iNaturalist | Free, no paywall | No | Optional | Nature walks with zero cost [2] [3] |
| Flora Incognita | Free, no ads | No | Optional, only for sync | Wild plants, research-backed [4] |
| Pl@ntNet | Free | No | Not stated in the listing | Contributing photos to plant research [5] [6] |
| PictureThis | Free tier with a daily ID allowance; Pro via trial | Pro uses a free trial that renews | Optional | Unlimited IDs and diagnoses if you pay [7] [8] |
How the trial trap works
Most paid plant apps don't charge you on day one. They offer a trial, and the trial turns into a subscription unless you cancel in time.
PictureThis is the clearest example. Its App Store listing offers "PictureThis Pro" with a free trial label [7]. The subscription renews automatically unless you turn off auto-renew at least 24 hours before the current period ends [7]. The same listing shows Pro at $39.99, with a family plan at $49.99 [7]. In 2023, a report collected by Deceptive Design described being enrolled in a 7-day free trial after tapping through onboarding, then billed automatically on the eighth day [8].
PictureThis does have a free tier. On Android it gives you at least 4 identifications a day, which expire if you don't use them [9]. That's fine for a quick check. It's less fine if you're cataloguing a shelf of new cuttings on a Sunday afternoon.
There's also a quieter trap. iNaturalist warns that commercial apps buy ads on searches for its name, so people download the wrong app by accident [2]. If you're searching for Seek, check that the developer is iNaturalist before you install.
Free vs. ad-supported vs. one-time purchase
"Free" covers three different deals. It helps to know which one you're getting.
Free, with research behind it. Seek, Flora Incognita and Pl@ntNet cost nothing to use [2] [4] [5]. Flora Incognita and Pl@ntNet are research projects run by universities and public institutes [4] [6]. The tradeoff is focus: they're built around studying plants, so check whether one offers care reminders before you count on it to keep your monstera watered.
Free with ads, plus a one-time purchase. GreenThumb takes this route. Every feature is in the free app, the ads stay out of care screens and reminders, and $3.99 once removes them [1]. Not per month. Not per year. Nothing renews, because there's no subscription [1].
Free tier, then a subscription. This is the PictureThis model: a daily ID allowance for free, with unlimited plant IDs, care tips and diagnoses in Pro [7] [9]. It can be worth it if you use those extras every week. Just set a calendar reminder the day you start a trial.
What "free" usually costs you in other ways
A free app can still ask for something. Check these before you install.
- An account. GreenThumb has no sign-up at all; you open it and point it at a plant [1]. Seek and Flora Incognita work without one too [3] [4].
- Your photos. GreenThumb runs identification on the phone, so photos aren't uploaded for identification [1]. Seek keeps your precise location out of the app and away from iNaturalist unless you sign in [3].
- A connection. GreenThumb's identification, care schedules, growth logs and reminders work offline; ads and purchases need a connection [1]. Flora Incognita saves observations in an offline mode and identifies them once you're back online [4]. Pl@ntNet added embedded offline identification on iOS [5]. Our guide to plant identification apps that work offline goes deeper.
How to pick one
Start with what you're identifying, then with what you want after the name.
- Houseplants, and you want reminders in the same app: GreenThumb. It's built for common houseplants, keeps care schedules and reminders on the phone, and has no subscription [1]. It's Android only for now [1].
- Plants on a walk, with zero cost and no sign-up: Seek [3].
- Wild plants, with research behind the results and no ads: Flora Incognita [4].
- You like your photos feeding public plant research: Pl@ntNet [5] [6].
- You want unlimited IDs plus plant diagnosis and will pay for it: PictureThis Pro, knowing the trial renews unless you cancel [7].
No identifier is right every time. GreenThumb isn't a general identifier for every species, and its matches can be wrong. It shows a confidence level and alternative candidates so you can compare them [1]. Lighting, photo quality and lookalike species all affect the result, so check the match before you trust its care schedule [1]. Our step-by-step guide on how to identify a houseplant from a photo shows how to verify a match in under a minute.
If a plant isn't covered, you can still track it. GreenThumb lets you add a plant from its care catalogue by common or scientific name, or give an unsupported plant a name and set your own watering, feeding and repotting schedule [1].
Frequently Asked Questions
Is there a plant identifier app that's completely free?
Do I need a credit card to use GreenThumb?
No. There's no subscription, no trial and no account [1]. A card only comes into it if you choose the one-time ad removal, and that goes through Google Play.
Does PictureThis have a free version?
How do I avoid being charged after a plant app trial?
Turn off auto-renew at least 24 hours before the trial ends; on the App Store, that's when the renewal is charged [7]. Or skip trials entirely and pick an app with no subscription.
Sources
- getgreenthumb.app: GreenThumb's site and FAQ describe on-device identification for common houseplants with confidence and alternative candidates, no account, no subscription or trial, free with ads and a one-time $3.99 ad removal as the only purchase, offline identification, schedules, growth logs and reminders, manual add from the care catalogue, and availability on Google Play with iOS coming soon.
- help.inaturalist.org: iNaturalist says iNaturalist and Seek are completely free with no subscriptions or paywalls, and warns that commercial apps advertise on searches for iNaturalist.
- apps.apple.com: Seek's App Store listing says it is free, does not require registration, does not collect user data by default, and does not store or send precise location unless you sign in.
- floraincognita.com: Flora Incognita's FAQ says the app is free of charge and advertising, needs no profile to identify plants, uses an offline mode that identifies saved observations once reconnected, and is led from TU Ilmenau and the Max Planck Institute for Biogeochemistry.
- apps.apple.com: Pl@ntNet's App Store listing shows it as free from Cirad-France, describes it as a citizen science project whose photos are analysed by scientists, and notes embedded offline identification on iOS.
- plantnet.org: Pl@ntNet describes itself as a citizen science project, says its trademark is owned by CIRAD, INRAE, INRIA and IRD, and asks for donations to keep it open and free.
- apps.apple.com: PictureThis's App Store listing offers PictureThis Pro with a free trial, lists Pro at $39.99 and a Family Plan at $49.99, describes Pro as unlimited plant IDs, care tips and diagnoses, and states that subscriptions renew unless auto-renew is turned off at least 24 hours before the period ends.
- deceptive.design: A June 2023 report describes being enrolled in a PictureThis 7-day free trial and billed automatically on the eighth day.
- picturethisai.com: PictureThis's FAQ says Android users get at least 4 free identifications each day, which expire if unused.