Comparison

Sigma Planner vs Feyn

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sigma Planner

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
Read full description

Sigma Planner is the perfect companion app for your academics that will help you track your classes and tasks with ease. It features a wide range of features to help you stay organized, as well as a beautiful design that is smooth, customizable, and adaptive for every device. With Sigma Planner, you will never need to carry your school planner anymore; all your planner and school information is available on your iPhone, iPad, and Mac. ORGANIZATION Sigma Planner offers a wide variety of features to organize your academic life. You should not need to clear or clutter your timetable every time you move onto the next semester. Sigma Planner offers the ability to organize your courses by semesters, which will allow you to retain records of all your past classes and assignments without having to delete them. TASKS Tasks are the core of any type of planner. In Sigma Planner, tasks can be created for a course, on a date, with a different task type, priority, and more. Tasks should always be easy to find; with the built-in search and filter features, you will never lose a task. CLASS SCHEDULES Sigma Planner is fully equipped to handle the many different schedule types around the world. The app is very flexible supports time-based, period-based, and block-based schedules, as well as supporting biweekly schedules, and late start or early end dates for specific classes. You can also enable class notifications to receive alerts before your classes occur. WIDGETS On iOS 14, Sigma Planner offers three kinds of home screen widgets which allow you to quickly glance at your planner data. You can quickly view your up next classes and tasks, focus on a specific course, or display your current week's timetable right from your home screen. Each widget also contain customization options to display just the information you want. iCLOUD SYNC Your data is always up to date across your devices through iCloud. You can edit a task on your iPhone, and you will immediately see them on iPad or Mac as soon as you hit save. There are no logins; no external accounts; it just works. FLEXIBILITY There are many built-in customizations available in Sigma Planner, including: dark mode, custom accent colours, display styles for tasks and courses, notification customizations, and more. The app also includes a handful of custom app icons to really spice up your home screen! DESIGN The app has a clean, simple, and intuitive interface. On top of that, Sigma Planner comes with 60 course icons to customize your classes, all on top of the customizations you get with the app. These course icons are also available as an iMessage sticker pack that comes with the app so you can share them with your friends! FOR iPAD Sigma Planner also has additional features for iPadOS users with an interface that is better suited for the larger iPad screen size, while at the same time, remain adaptive in supporting split screen multitasking and multiple-windows. Additionally, you can even drag a course to show the course detail in a separate window. Sigma Planner also offers support for trackpads and mice. ACCESSIBILITY Accessibility is one of the most powerful features of the iPhone, iPad, and Mac. Sigma Planner supports system accessibility features like Voice Over and Voice Control. Moreover, the app supports Dynamic Type, which scales text based on your system's Dynamic Type settings. SECURITY Protecting your tasks and course information has never been easier. Unlike your paper agenda, Sigma Planner has the ability to lock the app with a passcode, and allow your to easily unlock with Touch ID and Face ID on available devices.

About

Feyn

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
Read full description

Use flashcards, spaced-repetition, and your Apple Pencil to study with Feyn! Taking your own notes by hand and spaced-repetition are the best way to learn new concepts, and with Feyn you can do just that. Open up a book on your iPad and comfortably draw your flashcards right there using your Apple Pencil in Feyn. The flashcards are phone-sized so that you can then take them on the go and comfortably review them on your iPhone! Their vertical shape also makes them easy to write while multi-tasking on your iPad, and perfect for learning languages written top to bottom like Japanese. If you don't feel like drawing, just type some text using your keyboard or drop images into your flashcards. In this way, you *learn* on your iPad as you think of how to you summarize new concepts into flashcards, and *memorize* on your iPhone while you review them on the go! Feyn is fully featured, you can share flashcard to study with your friends. Your flashcards will automatically synchronize between your devices using your iCloud drive. Feyn also supports iOS' Quick Note, Handoff, and keyboard input: type away on your iPad or on our macOS app! Feyn uses spaced repetition to aid in learning. It will ask you to review flashcards depending on how well you recall them, flashcards you miss will be asked more often, and flashcards you get right less often. This way you minimize the total time you spend studying and maximize retention! Feyn Pro ads some nice to have extra features like study charts, to see how well you're learning, and flashcard importing. All other features are free and unrestricted. We guarantee that you will always be able to have a complete study experience for free. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Sigma Planner4 screens
Feyn4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Sigma Planner ships an update fortnightly, Feyn every 9 days. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

Scorecard6 real differences · 4 level
Sigma Planner versus Feyn: the parameters behind the verdict, then further details
ParameterSigma PlannerFeyn
PriceFreeFree
Rating4.8 (570 ratings) — better4.3 (91 ratings)
Positive reviews91.4% of reviews — better80.0% of reviews
Number of ratings570 — better91
Update frequencyFortnightlyEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS13.6 — better16.1
Further details — not scored
Size28 MB14 MB
Age rating4+4+
DeveloperShao-Chi LiangJoaquin Alori

Customer experience

Sigma Planner

All ratings570 ratings
Positive96.8%
Neutral2.8%
Negative0.4%
Written reviews139 reviews
Positive91.4%
Neutral6.5%
Negative2.2%

Feyn

All ratings91 ratings
Positive83.5%
Neutral5.5%
Negative11.0%
Written reviews215 reviews
Positive80.0%
Neutral7.9%
Negative12.1%

User reviews

Sigma Planner

From 570 App Store ratings

What we love

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

Room to improve

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

Feyn

From 91 App Store ratings

What we love

  • 👍 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

Room to improve

  • 🐛 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)

Bugs and requests

Sigma Planner

Reported bugs

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

Requested features

4 requests
  • 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

Reported bugs

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

Requested features

6 requests
  • 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
Show 1 more
  • Provide more customization options for cards (colors, layouts, etc.)

In-app purchases

None

Sigma Planner

No in-app purchases

3 purchases

Feyn

Subscriptions3
  • Feyn Pro (1 Month)7 Days trial$5.991 Month
  • Feyn Pro (6 Months)7 Days trial$19.996 Months
  • Feyn Pro (1 Year)7 Days trial$29.991 Year

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 8, 2026.

Other comparisons