# Piazza vs Codon

The clearest difference is rating: Codon at 5.0 against Piazza's 2.1. Piazza's advantage is in-app purchases (none vs 1) and ratings volume (279 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Codon sells 1 one-off in-app purchase. Piazza asks for nothing beyond the download.

Codon holds the better App Store score, 5.0 against 2.1. That said, the two scores are not equally well evidenced: Piazza has 279 ratings behind it against 1, so its average is the more settled of the two.

Piazza ships an update fortnightly, Codon every 10 days. The most recent releases landed on September 30, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Piazza | Codon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.1 (279 ratings)](https://appshunter.io/ios/app/piazza/id453142230/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/codon-learn-biology/id6796637767/reviews)** |
| Number of ratings | **279** | 1 |
| Positive reviews | 14.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Piazza Technologies, Inc.](https://appshunter.io/developer/453142233) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### Piazza

[App page](https://appshunter.io/ios/app/piazza/id453142230)

This platform facilitates communication and learning for higher education. Students can ask and answer questions, while instructors can monitor student engagement. It provides real-time updates and a centralized space for class interactions.

**Highlights:** Ask and answer questions, Real-time updates, Centralized class communication, Student engagement monitoring, Mobile access for students and instructors

**In-app purchases:** none

**What reviewers like**

- 🚀 Useful app
- 🚀 Great for tracking classes
- 🚀 Convenient mobile access

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Buggy and unreliable
- 🐛 Lacks key features from web version
- 🐛 Poor user interface and navigation
- 🔒 Login and authentication issues

**Reported bugs**

- Inability to post or reply
- Randomly logs out users
- Fails to load posts and resources
- Incompatible with newer iOS versions

**Requested features**

- Dark mode option
- Ability to access course materials
- Improved formatting and editing tools
- Better organization of posts and discussions
- Seamless integration with web version


### Codon

[App page](https://appshunter.io/ios/app/codon-learn-biology/id6796637767)

Master biology from molecules to ecosystems with a comprehensive, offline curriculum. Explore 100 lessons, researcher profiles, and landmark experiments. Learn mechanisms and track progress with spaced repetition and interactive quizzes.

**Highlights:** Offline biology curriculum, 100 lessons with narration, Researcher profiles, Interactive quizzes with explanations, Spaced repetition learning, Offline access, no account needed, Home screen widgets

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Codon Full Access | $9.99 | one-time |


## Frequently asked questions

### Is Piazza free?

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

### Is Codon free?

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

### Which has better reviews, Piazza or Codon?

Codon is rated higher. Piazza averages 2.1 out of 5 from 279 ratings, while Codon averages 5.0 from 1 ratings.

### Do Piazza or Codon have ads?

Neither Piazza nor Codon shows ads.

### Which is updated more often, Piazza or Codon?

Piazza ships an update fortnightly, and Codon every 10 days. Most recently, Piazza was updated on September 30, 2026 and Codon on September 22, 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.*