# Sigma Planner vs Feyn

The clearest difference is rating: Sigma Planner at 4.8 against Feyn's 4.3. Sigma Planner also leads on in-app purchases (none vs 3) and review sentiment (91% vs 80%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Feyn sells 3 in-app purchases, starting at $5.99 per month. Sigma Planner asks for nothing beyond the download.

Sigma Planner holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Sigma Planner has 570 ratings behind it against 91, so its average is the more settled of the two. Written reviews point the same way: 91% of Sigma Planner's written reviews are positive against 80% of Feyn's.

Sigma Planner ships an update fortnightly, Feyn every 9 days. The most recent releases landed on October 2, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Sigma Planner | Feyn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (570 ratings)](https://appshunter.io/ios/app/sigma-planner/id1106938042/reviews)** | [4.3 (91 ratings)](https://appshunter.io/ios/app/feyn-flashcards/id1533923364/reviews) |
| Number of ratings | **570** | 91 |
| Positive reviews | **91.4% of reviews** | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 14 MB |
| Requires iOS | **13.6** | 16.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Shao-Chi Liang](https://appshunter.io/developer/1106938041) | [Joaquin Alori](https://appshunter.io/developer/1527923529) |

## What reviewers say

### Sigma Planner

[App page](https://appshunter.io/ios/app/sigma-planner/id1106938042)

This app helps students organize their academic life by tracking classes, tasks, and schedules. It offers customizable features, cross-device syncing, and home screen widgets for easy access to important information.

**Highlights:** Organize courses by semester, Create and manage tasks with priority, Flexible class schedule support, Home screen widgets for quick access, iCloud sync across devices, Customizable themes and app icons

**In-app purchases:** none

**What reviewers like**

- 👍 Highly customizable
- 🚀 Seamless syncing across devices
- 💡 Comprehensive features for students
- 👍 Clean and intuitive interface
- 🚀 Completely free with no ads

**What reviewers complain about**

- 🐛 Calendar and date picker issues
- 🐛 Occasional app crashes
- 🐛 Courses/schedule not always displaying correctly

**Reported bugs**

- Calendar not showing all months
- Reminders not working as expected
- Syncing issues between devices

**Requested features**

- Ability to set recurring tasks/assignments
- Integration with other calendars (e.g. Google Calendar)
- More visual indicators for completed tasks
- Option to rearrange course order


### Feyn

[App page](https://appshunter.io/ios/app/feyn-flashcards/id1533923364)

Create and review flashcards by drawing with your Apple Pencil or typing. Utilize spaced repetition for effective memorization on your iPhone or iPad. Share decks with friends and sync across devices via iCloud.

**Highlights:** Handwritten flashcard creation with Apple Pencil, Spaced repetition learning system, Cross-device synchronization via iCloud, Flashcard sharing with friends, Image and text input options, iOS Quick Note and Handoff support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Feyn Pro (1 Month) | $5.99 | per month |
| Feyn Pro (6 Months) | $19.99 | per 6 months |
| Feyn Pro (1 Year) | $29.99 | per year |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Great for active recall and spaced repetition
- 💡 Handwritten flashcards with Apple Pencil support
- 🔒 No ads or paywalls
- 👍 Clean and minimalist design

**What reviewers complain about**

- 🐛 Sync issues between iPad and iPhone
- 🔍 Lack of search/filter options to find specific cards
- 🖋️ Limited writing tools (no zoom, pressure sensitivity, etc.)
- 📁 Difficulty organizing cards into nested folders
- 🔄 No option to flip cards in a specific order (front/back)

**Reported bugs**

- Cards sometimes disappear after updates
- App crashes on iOS 16 devices
- Palm rejection issues when writing

**Requested features**

- Add option to import/export flashcards
- Implement more review modes (e.g., front-to-back, back-to-front)
- Introduce a zoom function for better writing experience
- Add support for adding images/diagrams to cards
- Implement nested folder structure for better organization


## Frequently asked questions

### Is Sigma Planner free?

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

### Is Feyn free?

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

### Which has better reviews, Sigma Planner or Feyn?

Sigma Planner is rated higher. Sigma Planner averages 4.8 out of 5 from 570 ratings, while Feyn averages 4.3 from 91 ratings.

### Do Sigma Planner or Feyn have ads?

Neither Sigma Planner nor Feyn shows ads.

### Which is updated more often, Sigma Planner or Feyn?

Sigma Planner ships an update fortnightly, and Feyn every 9 days. Most recently, Sigma Planner was updated on October 2, 2026 and Feyn on October 16, 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.*