Simple vs Calc Ninja
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Simple
Enjoy a classic card game experience with this simple and pleasant application. Designed for quick play during commutes or while waiting, it offers intuitive controls and the ability to undo moves. The goal is to arrange all cards in descending order by suit.
- Simple and pleasant interface
- One-tap card movement
- Undo any move
- Ideal for short play sessions
- Classic Spider Solitaire gameplay
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Looking for a quick brain workout during your commute or downtime? Enjoy the ultimate Spider Solitaire experience, perfectly optimized for one-handed, comfortable play. With intuitive tap-to-move controls and an unlimited Undo feature, your gaming is completely stress-free! How to Play: Spider Solitaire is a classic card game played with two decks (104 cards). Arrange cards of the same suit in descending order from King to Ace to clear them from the board. Clear all 8 sequences to win! Ready for a challenge? Test your skills with 1-Suit (Easy), 2-Suit (Medium), or 4-Suit (Hard) modes. You can stack cards of different suits temporarily, but only sequences of the matching suit can be moved together. Pro Strategy Tips: - Use the Undo button frequently to explore different paths and flip hidden cards. - Create empty columns as fast as possible! The more open space you have, the more freedom you’ll have to maneuver cards and sweep the board.
Calc Ninja
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Calc Ninja is a mental-math battle puzzle. Fill the blanks in each equation to strike down the oni! How to play 1. Each battle shows an equation with blank tiles, e.g. ( □ + □ ) × □ = 18. 2. Tap number tiles to fill the blanks so the equation is true. 3. A correct answer strikes the demon; a wrong answer or running out of time lets it strike you. Content - 30 scrolls across 6 ninja ranks (Shoden to Gokui) - 16 unique oni bosses with a demon gallery - Operators and parentheses stay fixed. You only place the numbers, so it is pure mental math. Great for - Adults who want daily brain training - Anyone who likes number puzzles and quick arithmetic - Fans of a Japanese ninja-and-oni theme Free to play. No account required. * This app is a work of fiction. Characters and story are not based on real people or events.
Screenshots
Verdict
The clearest difference is update cadence: Calc Ninja at monthly against Simple's every 5 months. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Simple ships an update every 5 months, Calc Ninja monthly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Simple | Calc Ninja |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (49 ratings) — better | — |
| Positive reviews | 46.2% of reviews | — |
| Number of ratings | 49 — better | — |
| Update frequency | Every 5 months | Monthly — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 29 MB | 118 MB |
| Age rating | 4+ | 9+ |
| Developer | KENTA OKAMURA | kotaro yamada |
In-app purchases
Simple
No in-app purchases
Calc Ninja
No in-app purchases
