Comparison

AnkiMobile Flashcards vs Sum

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

Head to head
About

AnkiMobile Flashcards

This flashcard app offers a powerful spaced repetition system for efficient learning and memorization. Sync your decks across all your devices, including desktop and web, for seamless study anywhere. Supports large collections, custom card creation, and detailed progress tracking.

Highlights
  • Spaced repetition scheduling (SM-2 and FSRS)
  • Free sync with AnkiWeb across devices
  • Support for large card collections (100,000+)
  • Offline study with local media storage
  • Flexible interface for efficient study
  • Detailed progress graphs and statistics
  • MathJax and LaTeX rendering
Features
Read full description

Your decks, wherever you go! AnkiMobile is the official Anki app for iPhone and iPad, the flashcard app that more than 15 million learners worldwide have loved and trusted for over 20 years, made by the team behind Anki and AnkiWeb. Your purchase directly supports the open-source project that keeps Anki desktop free for everyone. Sync is included at no extra cost: no subscription, no sync fees. What you get: - Free sync with AnkiWeb. Keep your decks and study progress in sync across iPhone, iPad, Mac, Windows, Linux, and the web. Add cards on your computer, study them on your phone. - The same SM-2 and FSRS scheduling as desktop Anki, so you review material right as you're about to forget it. - A flexible interface designed for smooth and efficient study. - Detailed graphs and statistics about your progress. - Support for large collections, including 100,000+ cards. - Offline study. Media (images and audio) is stored on your device. - Powerful search for building filtered decks, e.g. "tagged high priority, answered in the last ten days, and not containing these words". - MathJax equations and LaTeX rendering. - Apple Pencil support for adding hand-drawn images to cards. Good to know: AnkiMobile works alongside the desktop version of Anki. Some tasks might require the desktop version, and add-ons are not supported on mobile yet. Sync is optional. You can also import and export data over USB or AirDrop. Buy once and use AnkiMobile on all your devices with the same Apple ID. Family Sharing is also supported. Educational institutions can find bulk discounts information through Apple's Volume Purchase Program. Need help? The manual and support resources are at https://docs.ankiweb.net/ankimobile/support. If you have questions or want to report an issue, contact us through our support site.

About

Sum

Track and manage your study time by subject with a simple timer. Log sessions, add notes, and visualize your progress with weekly graphs and a calendar. Focus on learning without distractions.

Highlights
  • Study time tracking
  • Subject and material logging
  • Weekly progress graphs
  • Calendar visualization
  • Study streaks
  • Pomodoro timer
Features
Read full description

This is a simple study timer app that allows you to record and manage your study time by subject. Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar. No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies. [Main Features] - 3 timer modes (Stopwatch, Countdown, Pomodoro) - Management of subjects, materials, pages, and notes - Weekly graphs to check subject balance (bar chart & donut chart) - Calendar to visualize study days with color-coding - Display of consecutive study days (streaks) - Daily study reminder - Backup and data export functions [Stackd Pro (One-time purchase)] - Monthly graphs and cumulative line graphs - Setting weekly goals and checking achievement rates - 9 color themes - Home screen and lock screen widgets - Real-time timer display on the Lock Screen

Screenshots

AnkiMobile Flashcards4 screens
Sum4 screens

Verdict

The call

The clearest difference is price: Sum at Free against AnkiMobile Flashcards's $24.99. Sum also leads on rating (5.0 vs 4.0) and review sentiment (100% vs 59%). AnkiMobile Flashcards's advantage is in-app purchases (none vs 1) and ratings volume (2.4K vs 2). On ads 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

Sum is free to download; AnkiMobile Flashcards costs $24.99 up front. Sum sells 1 one-off in-app purchase. AnkiMobile Flashcards asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sum holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: AnkiMobile Flashcards has 2.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 59% of AnkiMobile Flashcards's written reviews are positive against 100% of Sum's.

UpkeepUpdate frequency

AnkiMobile Flashcards ships an update every 6 weeks, Sum every 3 weeks. Both last shipped on November 9, 2026.

Scorecard10 real differences · 1 level
AnkiMobile Flashcards versus Sum: the parameters behind the verdict, then further details
ParameterAnkiMobile FlashcardsSum
Price$24.99Free — better
Rating4.0 (2.4K ratings)5.0 (2 ratings) — better
Positive reviews58.5% of reviews100.0% of reviews — better
Number of ratings2.4K — better2
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#1 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.2 — better18
Further details — not scored
Size38 MB3 MB
Age rating4+4+
DeveloperAnki Software, LLCNene Nakagawa

Customer experience

AnkiMobile Flashcards

All ratings2,375 ratings
Positive73.8%
Neutral5.1%
Negative21.1%
Written reviews1,589 reviews
Positive58.5%
Neutral12.9%
Negative28.6%

Sum

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

AnkiMobile Flashcards

Reported bugs

5 issues
  • Cards disappearing after updates
  • Inconsistent behavior when switching between apps
  • Inability to delete decks on mobile
  • Sync issues causing data loss
  • Compatibility problems with older iOS versions

Requested features

6 requests
  • Add dark mode option
  • Improve card browsing and management features
  • Integrate with Apple Pencil for better note-taking
  • Add support for more file formats (e.g., Opus audio)
  • Enhance mobile-specific features and UI
Show 1 more
  • Provide better onboarding and tutorials

Sum

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

AnkiMobile Flashcards

No in-app purchases

1 purchases

Sum

One-time1
  • Stackd Pro$1.99

Questions

Is AnkiMobile Flashcards free?
AnkiMobile Flashcards costs $24.99, with no in-app purchases.
Is Sum free?
Sum is free to download, with in-app purchases available.
Which has better reviews, AnkiMobile Flashcards or Sum?
Sum is rated higher. AnkiMobile Flashcards averages 4.0 out of 5 from 2.4K ratings, while Sum averages 5.0 from 2 ratings.
Do AnkiMobile Flashcards or Sum have ads?
Neither AnkiMobile Flashcards nor Sum shows ads.
Which is updated more often, AnkiMobile Flashcards or Sum?
AnkiMobile Flashcards ships an update every 6 weeks, and Sum every 3 weeks. Most recently, AnkiMobile Flashcards was updated on November 9, 2026 and Sum on November 9, 2026.

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