# Knowunity vs Astra AI

The clearest difference is update cadence: Knowunity at every 2 days against Astra AI's every 9 days. Knowunity also leads on chart position (#8 vs #177). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Knowunity sells 9 in-app purchases, starting at $9.99 per 7 days and Astra AI sells 10 in-app purchases, starting at $8.00 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Knowunity against 4.8 for Astra AI. Both are backed by a comparable volume of ratings — 13K and 5.6K respectively. Written reviews split almost evenly too, at 82% and 82% positive.

Knowunity ships an update every 2 days, Astra AI every 9 days. Both last shipped on November 10, 2026.

## The numbers

| Metric | Knowunity | Astra AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (13K ratings)](https://appshunter.io/ios/app/knowunity-ai-study-and-homework/id1484296272/reviews) | **[4.8 (5.6K ratings)](https://appshunter.io/ios/app/astra-ai-study-and-exam-prep/id6751030141/reviews)** |
| Number of ratings | **13K** | 5.6K |
| Positive reviews | **82.3% of reviews** | 81.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 9 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#8** | #177 |
| Size | 258 MB | 26 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Knowunity GmbH](https://appshunter.io/developer/1484296271) | [Astra AI d.o.o.](https://appshunter.io/developer/1833181873) |

## What reviewers say

### Knowunity

[App page](https://appshunter.io/ios/app/knowunity-ai-study-and-homework/id1484296272)

**Currently charting:** #8 Top Free · Education, #58 Top Grossing · Education (US App Store)

This AI-powered learning companion helps students prepare for exams like SAT, ACT, and AP. It creates personalized study plans with flashcards, quizzes, and mock exams, and offers homework help by explaining problems step-by-step. Students can also access over a million shared notes and summaries from a collaborative community.

**Highlights:** Personalized daily study plans, AI-powered homework explanations, Flashcards and quizzes, Mock exams with AI scoring, Voice recall and tutor chat, Community notes and summaries, Gamified learning with XP and leagues

**Features:** Family Sharing

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knowunity Pro | $9.99 | per 7 days |
| Knowunity Pro | $14.49 | per 7 days |
| Knowunity Pro | $14.99 | per month |
| Knowunity Pro | $15.99 | per month |
| Knowunity Pro | $20.49 | per month |
| Knowunity Pro | $42.49 | per year |
| Knowunity Pro | $49.99 | per year |
| Knowunity Pro | $49.99 | per year |
| Knowunity Pro | $83.99 | per year |

**What reviewers like**

- 🚀 Helpful AI assistant
- 👍 Useful revision notes and flashcards
- 💡 Collaborative community features
- 🚀 Efficient study tools
- 👍 Free app with no ads

**What reviewers complain about**

- 🔒 Paywall for premium features
- 🐛 Bugs and glitches in the app
- 🔒 Restricted access for younger users
- 🐛 Inconsistent user experience after updates

**Reported bugs**

- Frequent app crashes and freezes
- Issues with uploading and saving notes
- Problems with group chat functionality
- Inconsistent behavior when navigating the app

**Requested features**

- Add more advanced class options
- Improve search and organization of notes
- Implement a draft feature for creating study materials
- Add more customization options


### Astra AI

[App page](https://appshunter.io/ios/app/astra-ai-study-and-exam-prep/id6751030141)

**Currently charting:** #177 Top Free · Education (US App Store)

This AI-powered study assistant provides instant, step-by-step guidance for subjects like math, physics, and chemistry. It offers exam preparation, homework help, and in-depth subject exploration, adapting to your learning pace and country's curriculum.

**Highlights:** AI-powered step-by-step solutions, Snap and solve homework, Personalized exam preparation, Curriculum-aligned lessons, 24/7 availability, Support for 14 subjects

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Astra AI Plus - Weekly | $8.00 | per 7 days |
| Astra AI Plus - Monthly | $24.00 | per month |
| Astra AI Sigma - Monthly | $80.00 | per month |
| Astra AI Plus - Yearly | $119.99 | per year |
| Astra AI Plus - Monthly (12 Mo Com) | $119.99 | per year |
| Astra AI Plus - Yearly | $119.99 | per year |
| Credit Pack 2x | $15.00 | one-time |
| Credit Pack 3x | $28.00 | one-time |
| Credit Pack 10x | $99.00 | one-time |
| Exam Pass | $121.99 | one-time |


## Frequently asked questions

### Is Knowunity free?

Knowunity is free to download, with in-app purchases available.

### Is Astra AI free?

Astra AI is free to download, with in-app purchases available.

### Which has better reviews, Knowunity or Astra AI?

Astra AI is rated higher. Knowunity averages 4.7 out of 5 from 13K ratings, while Astra AI averages 4.8 from 5.6K ratings.

### Do Knowunity or Astra AI have ads?

Both Knowunity and Astra AI show ads.

### Which is updated more often, Knowunity or Astra AI?

Knowunity ships an update every 2 days, and Astra AI every 9 days. Most recently, Knowunity was updated on November 10, 2026 and Astra AI on November 10, 2026.

### Which is more popular, Knowunity or Astra AI?

Knowunity currently peaks at #8 in the App Store charts, and Astra AI at #177. Chart position reflects recent download velocity rather than total install base.

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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.*