Otti vs Plant Nanny: a thirsty plant and a cozy otter, compared
Plant Nanny and Otti both give you something cute to look after. In Plant Nanny, every glass of water you log waters a little plant. In Otti, tiny self-care steps help an otter grow up on a journey down the river. Here’s how they differ, and which might suit you.
Updated October 20, 2026 · By the Otti team (yes, we make Otti, so read with that in mind)
Choose Plant Nanny if…
- Drinking more water is your main goal, and you want a water goal, reminders, charts and Apple Health sync.
- You love collecting and growing lots of different plants.
- You want an Apple Watch app.
- You’d rather look after a plant than an otter!
Choose Otti if…
- You want help with more than water: tiny steps like stepping outside, stretching or messaging someone.
- You want a pet to actually look after, tamagotchi-style: feeding, naps, baths and play, without it ever getting sick or dying.
- You’d like an app with no ads, and a currency you can only earn, never buy.
- You like a story, a simple mood journal and a small circle of friends whose otters hold paws.
At a glance
| Feature | Otti | Plant Nanny |
|---|---|---|
| What it is | OttiA cozy self-care pet: tiny daily steps help your otter grow up on a journey down the river | Plant NannyA cute water tracker: each glass of water you log waters a plant and grows your greenhouse |
| Pet or character | OttiYes. Hatch one of six 3D otters, each with its own look and personality, and care for it tamagotchi-style (feeding, naps, baths, play) | Plant NannyYes, plants. Grow a greenhouse at three difficulty levels, with greenhouse creatures and seasonal plants |
| Missing a day | OttiYour otter may get hungry or sleepy, but never sick, and it never dies. A day count restarts, but growth and story progress never reset | Plant NannyNot covered in official docs. Reviewers say the plant looks dry or wilted but recovers when you drink, and doesn’t die in the current version |
| Price (US) | OttiFree during the beta. Pricing will be announced before launch | Plant NannyFree to use, with ads. SPARKFUL Subscription: $69.99/year, $44.99 every six months, or $3.99 or $7.99/month. Clover packs and items sold separately |
| Friends | OttiOptional Raft: friends’ otters hold paws, send cheers and small gifts. No chat, no public profiles | Plant NannyNone advertised |
| In-app currency | OttiPebbles, earned only through self-care. They can’t be bought | Plant NannyClovers, which are also sold in packs for $1.99, $4.99 and $19.99 |
| Privacy | OttiJournal and mood check-ins stay on your phone. No ads, no selling data. No account needed to start | Plant NannyApp Store label: identifiers used to track you; email and user ID linked to you. Policy says it doesn’t sell personal information but may share aggregate data with advertisers and show targeted ads |
| Platforms | OttiiPhone and Android (in beta) | Plant NannyiPhone, iPad, Apple Watch, Apple Vision and Android |
| Store ratings (US) | OttiNew: in beta, not rated yet | Plant NannyApp Store 4.7 (about 107K ratings). Google Play 4.7 (181K reviews, 5M+ downloads) |
What Plant Nanny does well
Plant Nanny, made by SPARKFUL INC. (and originally by Fourdesire, since 2013), is a cute water tracker. Each glass of water you log waters a plant and grows your greenhouse. Around that sit a personalised water goal and reminders, charts, plants at three difficulty levels, mini-challenges, greenhouse creatures, seasonal plants, a widget and Apple Health sync. It’s on iPhone, iPad, Apple Watch, Apple Vision and Android, and it suits anyone who wants a friendly nudge to drink more water.
- It’s a real water tracker: a personalised water goal, reminders, charts and Apple Health sync. Otti doesn’t track water.
- It’s very cute, and reviewers say it genuinely motivates them to drink more water.
- Lots of plants to grow at three difficulty levels, plus greenhouse creatures, seasonal plants and mini-challenges.
- Forgiving, according to reviewers: the plant looks dry or wilted when you haven’t had enough water, then recovers when you drink, so coming back is easy. It’s also usable for free.
- It works on iPhone, iPad, Apple Watch, Apple Vision and Android, with a widget.
- Long-running and well loved: 4.7 stars from about 107,000 ratings on the US App Store, and 4.7 stars with 5M+ downloads on Google Play.
How Otti is different
- Self-care beyond water. You choose a small daily plan from 16 tiny steps, like drinking a glass of water, stepping outside, stretching, brushing your teeth or naming one feeling. After 3 steps in a day, a clam present opens with a little treasure.
- An otter, not a plant. You hatch one of six 3D otters, each with its own look and personality, and you can tap its head, rub its belly or squish its cheeks. It rolls and does little tricks.
- Tamagotchi-style care. Your otter gets hungry, sleepy, messy or wants to play, and you feed it, tuck it in for naps, give it bubble baths and play together. Its face shows how it feels. It never gets sick and never dies.
- A story and a mood journal. Your otter grows from pup to grown-up and travels down the river in six chapters, with an evening story to unlock on days you take care of yourself. A daily mood check-in with a note stays on your phone.
- No ads, and pebbles (Otti’s currency) can only be earned through self-care, never bought. Plant Nanny shows ads and sells clover packs.
- Friends if you want them. In the Raft, friends’ otters hold paws, and you can send cheers and small gifts. Plant Nanny doesn’t advertise a social feature.
- Otti isn’t a water tracker. There’s no water goal, no amounts to log and no Apple Watch app. If drinking more water is your main goal, Plant Nanny is built for exactly that.
Pricing
Plant Nanny is free to use, with ads. The SPARKFUL Subscription costs $69.99 a year, $44.99 every six months, or $3.99 or $7.99 a month on the US App Store. It unlocks 42+ plants, custom goals, sounds and a premium widget, and removes ads, though rewarded ads remain. You can also buy clover packs (Plant Nanny’s in-app currency) for $1.99, $4.99 or $19.99, as well as a watering can and themed packs. There’s one free trial per person, and its length depends on the plan. No lifetime plan is listed.
Otti is in beta and free to try. Pebbles, the currency for outfits and treats, are only earned through self-care and can’t be bought. We’ll share full pricing before launch.
Missing a day
Plant Nanny’s store text and help centre don’t describe what happens if you don’t log water. Reviewers say the plant looks dry or wilted until you drink again, then recovers, and that plants don’t die in the current version. That makes it easy to come back after a break.
In Otti, your otter can get hungry, sleepy or a bit messy if you’ve been away, but it never gets sick, never dies and is always happy to see you. Its growth and story progress never reset. There is a simple day count, but nothing is taken away when it restarts.
Sources
Facts about Plant Nanny come from its own website, app store listings and help pages, checked on October 20, 2026. Prices and features change, so check the app store for the latest. Spotted something out of date? Email hello@ottiapp.com and we’ll fix it.
- Plant Nanny on the US App Store
- Plant Nanny on Google Play
- Plant Nanny help centre
- SPARKFUL Subscription
- Plant Nanny help: Free trial
- SPARKFUL privacy policy
Plant Nanny is a trademark of its owner. Otti isn’t affiliated with or endorsed by SPARKFUL INC.
Questions people ask
Is Plant Nanny free?
Yes, Plant Nanny is free to use, with ads. The SPARKFUL Subscription ($69.99 a year, $44.99 every six months, or $3.99 or $7.99 a month on the US App Store, checked October 2026) unlocks 42+ plants, custom goals and more, and removes ads apart from rewarded ads.
Is Otti a Plant Nanny alternative?
It is if you want a cute companion for self-care in general, not just water. Drinking a glass of water is one of Otti’s 16 tiny steps, but Otti isn’t a water tracker: there’s no water goal and no amounts. If you mainly want to track how much you drink, Plant Nanny is the better fit.
Plant Nanny vs Otti: which should I choose?
Choose Plant Nanny if you want to drink more water and love growing plants. Choose Otti if you want a 3D otter to care for, tamagotchi-style, with tiny self-care steps, a river story and a simple mood journal.
Do plants die in Plant Nanny if you miss a day?
Plant Nanny’s official pages don’t say. Reviewers say the plant looks dry or wilted when you haven’t had enough water, recovers when you drink, and doesn’t die in the current version.
Does the otter in Otti die?
No. Your otter can get hungry, sleepy or a bit messy if you’ve been away, but it never gets sick and never dies, and its growth and story progress never reset. There’s a day count that restarts after a missed day, but nothing is taken away.
Does Plant Nanny have ads?
Yes. Both app stores list it as containing ads. The subscription removes them, though rewarded ads remain. Otti has no ads.