# Calflora Observer Pro vs KnowKi

The clearest difference is update cadence: KnowKi at every 4 days against Calflora Observer Pro's every 3 months. KnowKi also leads on rating (5.0 vs 4.6). Calflora Observer Pro's advantage is ratings volume (8 vs 2) and iOS requirement (15.0 vs 17.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KnowKi holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Calflora Observer Pro ships an update every 3 months, KnowKi every 4 days. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Calflora Observer Pro | KnowKi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (8 ratings)](https://appshunter.io/ios/app/calflora-observer-pro/id1199907272/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/knowki/id6817068034/reviews)** |
| Number of ratings | **8** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 6 MB | 44 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Calflora Database](https://appshunter.io/developer/605784321) | [Garrett Craig](https://appshunter.io/developer/6817068036) |

## What reviewers say

### Calflora Observer Pro

[App page](https://appshunter.io/ios/app/calflora-observer-pro/id1199907272)

Record observations of wild plants in California with photos, GPS, and notes. Upload your findings to the Calflora.org website to contribute to botanical data. Essential tips are available within the app.

**Highlights:** Record wild plant observations, Include photos and GPS coordinates, Add notes and other information, Upload data to Calflora.org, Access essential tips within the app

**Features:** macOS Compatibility

**In-app purchases:** none


### KnowKi

[App page](https://appshunter.io/ios/app/knowki/id6817068034)

Discover and learn about the living beings in your chosen environment. This app uses real-world observations and interactive lessons to help you identify local flora and fauna, building your knowledge day by day. Engage with fun quizzes and track your progress in your personal field guide.

**Highlights:** Identify local species by group (birds, plants, insects, etc.), Learn with real photos and iNaturalist observations, Daily quizzes and practice exercises, Personalized field guide with progress tracking, Explore species by region or specific locations, Connect with friends and share scores

**In-app purchases:** none


## Frequently asked questions

### Is Calflora Observer Pro free?

Calflora Observer Pro is free to download, with no in-app purchases.

### Is KnowKi free?

KnowKi is free to download, with no in-app purchases.

### Which has better reviews, Calflora Observer Pro or KnowKi?

KnowKi is rated higher. Calflora Observer Pro averages 4.6 out of 5 from 8 ratings, while KnowKi averages 5.0 from 2 ratings.

### Do Calflora Observer Pro or KnowKi have ads?

Neither Calflora Observer Pro nor KnowKi shows ads.

### Which is updated more often, Calflora Observer Pro or KnowKi?

Calflora Observer Pro ships an update every 3 months, and KnowKi every 4 days. Most recently, Calflora Observer Pro was updated on November 2, 2026 and KnowKi on November 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*