# AnkiMobile Flashcards vs Sum

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.

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.

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.

AnkiMobile Flashcards ships an update every 6 weeks, Sum every 3 weeks. The most recent releases landed on November 10, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | AnkiMobile Flashcards | Sum |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | [4.0 (2.4K ratings)](https://appshunter.io/ios/app/ankimobile-flashcards/id373493387/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews)** |
| Number of ratings | **2.4K** | 2 |
| Positive reviews | 58.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#1** | — |
| Size | 38 MB | 3 MB |
| Requires iOS | **15.2** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Anki Software, LLC](https://appshunter.io/developer/1895276950) | [Nene Nakagawa](https://appshunter.io/developer/1821103094) |

## What reviewers say

### AnkiMobile Flashcards

[App page](https://appshunter.io/ios/app/ankimobile-flashcards/id373493387)

**Currently charting:** #1 Top Paid · Education, #5 Top Paid, #39 Top Grossing · Education (US App Store)

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:** Game Controller support, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💯 Excellent learning tool
- 🤓 Powerful spaced repetition algorithm
- 🌐 Seamless cross-device sync
- 🎨 Customizable flashcards
- 📚 Supports various media (text, images, audio, video)

**What reviewers complain about**

- 🤯 Steep learning curve
- 🤖 Unintuitive interface
- 🖼️ Issues with image syncing and display
- 🔌 Syncing problems between devices
- 🕰️ Slow performance and lag

**Reported bugs**

- 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**

- 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


### Sum

[App page](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


## Frequently asked 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 10, 2026 and Sum on November 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*