1. Pl@ntNet — the only fully free option that competes with paid apps
Pl@ntNet is the genuine answer to 'a plant ID app without a subscription'. It is free, ad-supported, open source, and does not gate identification behind any paywall. The app is run by a French research consortium (CIRAD, INRA, IRD, INRIA) and powered by a community-verified photo database — when you submit a plant, it matches against thousands of correctly-labelled images from real botanists.
Accuracy: 80% across a 30-photo houseplant test (matching PictureThis at 77% and beating Google Lens at 63%). The app shows match probability for each candidate species, which is honest about uncertainty in a way most paid apps are not. The downside: the UI is botanical-first — Latin names appear before common ones, which can feel intimidating for beginners.
2. Google Lens — fastest free option, already on your phone
Google Lens is built into Google Search, the Google Photos app, and most Android phones (iOS access via the Google app). It is free, has no account requirement, and identifies a plant in roughly five seconds.
Accuracy: 60–70% on common houseplants, weaker on cultivars and rare species. It uses Google's reverse image search behind the scenes, so it is best when the plant is common enough that thousands of correctly-labelled photos exist online. For pothos, monstera, snake plants, and the standard houseplants, Lens is fast and reliable. For anything unusual it falls back to the closest visual match, which is often wrong.
3. iNaturalist Seek — free, best for outdoor and wild plants
Seek is the consumer-facing app from the team behind iNaturalist, the global biodiversity observation network. It is free, ad-free, requires no account, and identifies plants, insects, fungi, and animals.
Where Seek shines: native plants, weeds, trees, and biodiversity around the home. Where it is weaker: tropical houseplants and cultivars are not its training focus. On the same 30-photo houseplant test it scored 60% — fine for common species, less reliable for monstera cultivars or aroid hybrids. If you spend more time identifying plants in your garden than your living room, Seek is the right install.
4. LeafSnap — technically free, paywalled in practice
LeafSnap was originally a free academic project from Columbia University and the Smithsonian; the version on app stores in 2026 is a different commercial app of the same name. It markets itself as free but gates identification behind a 7-day trial that auto-renews to a paid subscription (~£40/year).
If you cancel within the trial it is free for that week. After that it is paid. Accuracy is roughly comparable to PictureThis, but for free-only use it is not the right pick — Pl@ntNet does the same job without the trial-and-cancel dance. Avoid unless you specifically want a single-app paid bundle and have decided against PictureThis.
5. PlantSnap — same paywall pattern as LeafSnap
PlantSnap is another popular search result for 'free plant ID' that is technically free to install but paywalls identification behind a trial subscription. Pricing is in the same £30–£40/year range as the others. Accuracy on houseplants is mid-tier — better than Google Lens, slightly worse than PictureThis or Pl@ntNet.
It exists in this list because people search for it specifically, and it is worth knowing that the free version is not actually free for ongoing use. If you want a no-subscription tool, do not install it.
What 'free' actually means — five patterns to watch for
Free apps are not all free in the same way. The five patterns:
- ·Genuinely free (Pl@ntNet, Google Lens, iNaturalist Seek): unlimited identifications, no trial, no paywall, optional ads or none.
- ·Free with mandatory account: still free but locks you into ecosystem signups (rare in this category).
- ·Free trial that auto-renews (PictureThis, LeafSnap, PlantSnap): you get 7 days, then it auto-charges. Cancel-before-day-7 is technically free.
- ·Freemium with limited identifications per day (some smaller apps): identify 3 plants per day free, more requires payment.
- ·Free with paid 'expert review': identifications are free but accuracy is low; an expert review costs £5–£10 per plant.
The no-subscription two-app stack
The simplest free-only setup that handles the vast majority of identification needs: install Pl@ntNet for accuracy and keep Google Lens accessible on the phone for one-off lookups. If you also identify outdoor plants, add iNaturalist Seek as a third app.
Workflow: take three photos (whole plant, single mature leaf, petiole close-up — see the photo identification guide), run them through Pl@ntNet first, cross-check with Google Lens. If both agree, you have a 90%+ confidence answer. If they disagree, switch to manual identification using the leaf shape guide and the petiole-and-vein-pattern check.
When free apps aren't enough
Free apps cover 80% of houseplant identification. The 20% they miss is concentrated in three areas: cultivars within a species (Monstera 'Thai Constellation' vs 'Albo Borsigiana', Philodendron 'Pink Princess' vs 'Pink Congo'), rare collector species (Anthurium warocqueanum, Philodendron gloriosum), and damaged or partial photos.
For these, the right move is not a different app — it is a specialist community. Reddit's r/houseplants and r/aroids, dedicated Facebook groups for genera you collect, and the International Aroid Society forum are all free and significantly more accurate than any app for cultivar-level ID. The AI chatbot test covers when ChatGPT or Claude is worth a try as a sanity check after the app gives a confidently wrong answer.
