Summation vs Starchess
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Summation
Engage your brain with a minimalistic math puzzle game. Rearrange numbers to solve increasingly challenging levels. Explore new themes and enjoy endless gameplay.
- Minimalistic math puzzle gameplay
- Rearrange numbers to solve puzzles
- Endless levels for infinite play
- Unlockable game themes
- Brain workout challenges
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Summation is a minimalistic math game that will give your brain a workout. The objective of the game is to solve the puzzle by rearranging the numbers given to you. Sound easy? But can you get to level 100? Features: - Endless Level. You can play forever. - Unlock new game themes. - New game modes coming. Get in touch: game@lemon-jam.com Twitter:twitter.com/lemonjamstudio Facebook:facebook.com/lemonjamstudio
Starchess
Experience chess with a unique twist on a three-dimensional board. Pieces gain new movement capabilities, allowing for strategic plays in up, down, and diagonal directions. Enjoy a fresh challenge to your chess skills.
- Three-dimensional chess board
- Traditional chess rules
- Expanded piece movement (up, down, diagonal)
- Unique strategic gameplay
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Starchess has all of the same rules as traditional chess but now on a three-dimensional board. Pieces can move up, down and diagonally.
Screenshots
Verdict
The clearest difference is rating: Starchess at 5.0 against Summation's 4.2. Starchess also leads on in-app purchases (none vs 2) and review sentiment (100% vs 70%). Summation's advantage is update cadence (every 3 weeks vs every 4 months) and ratings volume (58 vs 1). On price, 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
Both are free to download. Summation sells 2 one-off in-app purchases. Starchess asks for nothing beyond the download.
Starchess holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Summation has 58 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 70% of Summation's written reviews are positive against 100% of Starchess's.
Summation ships an update every 3 weeks, Starchess every 4 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.
| Parameter | Summation | Starchess |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (58 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 70.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 58 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 110 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Lemon Jam Technology Co., Ltd. | Nathan Lane |
Customer experience
Summation
Starchess
Bugs and requests
Summation
Reported bugs
12 issues- Hint button freezes game and requires reinstall to fix
- Game crashes at specific levels (e.g., level 102)
- App crashes immediately upon opening with blue dot indicator
- Full-screen ads cannot be closed and trap users
- Game gets stuck in landscape mode after full-page ad
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- Ads prevent progression in Challenge Mode
- App Store opens involuntarily multiple times in succession
- Mute setting resets every time app is opened
- Display not properly fitted for iPhone X
- Unsolvable levels in Challenge Mode after paying for ad removal
- Game Center leaderboards not accessible except after beating levels
- Next level button obscured by puzzle elements
Requested features
10 requests- Dark mode for nighttime playing
- Multiplication puzzle variant
- Increased difficulty progression beyond level 100
- More varied puzzle structures and mechanics
- Ability to purchase larger quantities of hints at once
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- Proper Game Center integration with friend additions
- Information about total number of levels available
- Night mode for bedtime gameplay
- Persistent mute setting across sessions
- Better level syncing across devices
Starchess
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Summation
- Buy Hints$0.99
- Remove Ads$1.99
Starchess
No in-app purchases
