# Sumdog vs Klock.io

The clearest difference is rating: Klock.io at 5.0 against Sumdog's 4.2. Klock.io also leads on in-app purchases (none vs 1). Sumdog's advantage is ratings volume (1.6K vs 1) and iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sumdog sells 1 in-app purchase, starting at $8.99 per month. Klock.io asks for nothing beyond the download.

Klock.io holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Sumdog has 1.6K ratings behind it against 1, so its average is the more settled of the two.

Sumdog ships an update every 2 months, Klock.io daily. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sumdog | Klock.io |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (1.6K ratings)](https://appshunter.io/ios/app/sumdog/id1145809959/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/klockio/id6811347852/reviews)** |
| Number of ratings | **1.6K** | 1 |
| Positive reviews | 63.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 134 MB | 3 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sumdog Ltd.](https://appshunter.io/developer/644331332) | [Aaron Jabamani](https://appshunter.io/developer/6811347854) |

## What reviewers say

### Sumdog

[App page](https://appshunter.io/ios/app/sumdog/id1145809959)

This app offers personalized math and spelling practice for children aged 5-14 through engaging games and adaptive learning. It uses diagnostic tests to tailor learning journeys and provides virtual rewards to motivate students. Parents can set up accounts for home use or connect to school-assigned work.

**Highlights:** Personalized adaptive learning, Engaging single and multiplayer games, Thousands of standards-aligned questions, Virtual coin rewards system, 3D avatar and house personalization, Diagnostic assessment

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Family Membership | $8.99 | per month |

**What reviewers like**

- 🎮 Fun and engaging games
- 🏆 Competitive leaderboards
- 🏠 Customizable avatar and house
- 📚 Helps with learning math, spelling, and grammar
- 🏫 Useful for schools and teachers

**What reviewers complain about**

- 🐛 Glitches and bugs
- 🕰️ Slow loading times
- 🔒 Limited access to premium features without subscription
- 🤖 Weird or unappealing 3D character models
- 🔍 Lack of instructions for some games

**Reported bugs**

- Flower Defenders game not working properly
- Goalz game not registering shots correctly
- Sudden logout issues
- Incompatibility with certain devices or browsers

**Requested features**

- Add more free games
- Bring back old 2D games
- Allow interaction with house and garden items
- Improve multiplayer functionality
- Add more customization options for avatar and house


### Klock.io

[App page](https://appshunter.io/ios/app/klockio/id6811347852)

This app acts as a pacing tool for UK university admissions tests like ESAT and TMUA. It times each question individually, showing students if they are ahead or behind pace, helping them manage their time effectively during exams.

**Highlights:** Individual question timing, Pacing status (ahead/behind), Per-question breakdown, Customizable exam targets, Syllabus point tagging, Live Activity on Lock Screen, Compact iPad timer window

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sumdog free?

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

### Is Klock.io free?

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

### Which has better reviews, Sumdog or Klock.io?

Klock.io is rated higher. Sumdog averages 4.2 out of 5 from 1.6K ratings, while Klock.io averages 5.0 from 1 ratings.

### Do Sumdog or Klock.io have ads?

Neither Sumdog nor Klock.io shows ads.

### Which is updated more often, Sumdog or Klock.io?

Sumdog ships an update every 2 months, and Klock.io daily. Most recently, Sumdog was updated on October 20, 2026 and Klock.io on October 8, 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.*