Comparison

Nonograms Katana vs Slitherlink JAM

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

Head to head
About

Nonograms Katana

Engage in logic puzzles where you fill cells based on numerical clues to reveal hidden pictures. This app offers a vast collection of puzzles, tools for marking cells, and options to create and share your own challenges.

Highlights
  • 1001 nonogram puzzles
  • Create and share custom puzzles
  • Black-and-white and colored puzzles
  • Puzzles sorted by size
  • Hints and undo/redo functionality
  • Cloud save and achievements
Features
Read full description

Nonograms Katana: Sharpen your mind! Nonograms, also known as Hanjie, Griddlers, Picross, Japanese Crosswords, Japanese Puzzles, Pic-a-Pix, "Paint by numbers" and other names, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the side of the grid to reveal a hidden picture. The numbers are a form of discrete tomography that measures how many unbroken lines of filled-in squares there are in any given row or column. For example, a clue of "4 8 3" would mean there are sets of four, eight, and three filled squares, in that order, with at least one blank square between successive groups. To solve a puzzle, one needs to determine which cells will be boxes and which will be empty. Determining which cells are to be left empty (called spaces) is as important as determining which to fill (called boxes). Later in the solving process, the spaces help determine where a clue (continuing block of boxes and a number in the legend) may spread. Solvers usually use a dot or a cross to mark cells they are certain are spaces. It is also important never to guess. Only cells that can be determined by logic should be filled. If guessing, a single error can spread over the entire field and completely ruin the solution. Features: - 1001 nonograms - All puzzles are free - All puzzles tested by computer program and have unique solution - Black-and-white and colored - Nonograms sorted by groups from 5x5 to 50x50 - Download puzzles sent by other users - Create and share your own puzzles - 15 free hints per puzzle - Use crosses, dots and other symbols to mark cells - Auto cross out numbers - Auto fill trivial and completed lines - Auto save; if you stuck you can try another puzzle and come back later - Zoom and smooth scrolling - Lock and zoom number bars - Lock current puzzle state, check assumptions - Customize background - Optional cursor for accurate picking - Undo and redo - Share result pictures - Save game progress to the cloud - Achievements and leaderboards - Screen rotation - Suitable for phones and tablets VIP Features: - No Ads - View Answer - 5 extra hints per puzzle The Guild Expansion: Welcome to the Adventurers Guild! By solving puzzles, you will get loot and experience. You will have weapons that allow you to deal with puzzles much faster. You will be able to complete quests and receive a reward. You will have to rebuild the settlement and collect the lost mosaic piece by piece. The Dungeon Expansion: Game in a game in a game. Isometric turn-based RPG. What adventurer doesn't dream of exploring a dungeon? site: https://nonograms-katana.com facebook: https://www.facebook.com/Nonograms.Katana

About

Slitherlink JAM

A logic puzzle game where you draw a single, unbroken loop around a grid of numbers. Each number indicates the number of surrounding walls. Offers infinite puzzles, helpful tools, and leaderboards.

Highlights
  • Infinite free puzzles
  • Logic-based gameplay
  • Tutorial and hints
  • Undo and 'healing' feature
  • Leaderboards and achievements
  • Automatic wall removal options
Features
Read full description

Relax with infinite, free logic puzzles, NO ads, draw one continuous loop using pure deduction, no math required. Each number indicates how many walls surround that cell. The game is an enjoyable combination of logic and searching for the next move. FEATURES: - Practically **INFINITE** number of **FREE** puzzles for every level of difficulty (beginner to advanced) - Best gameplay for creating and removing walls. (No annoying X's) - Tutorial + Puzzles that teach you how to play the game - Hints to help solve puzzles - Undo & "Healing" to correct any mistakes - Leaderboards & Achievements with Game Center integration AWESOME OPTIONS: (in Settings) - Game automatically removes walls around 0's - Game automatically removes dead-ends and extra walls around corners - Game Automatically removes extra walls around completed 1's, 2's and 3's

Screenshots

Nonograms Katana4 screens
Slitherlink JAM4 screens

Verdict

The call

The clearest difference is update cadence: Nonograms Katana at every 3 months against Slitherlink JAM's every 113 months. Nonograms Katana also leads on ratings volume (6.8K vs 8) and rating (4.8 vs 4.5). On price, ads, in-app purchases and monetization model 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

Both are free to download. Nonograms Katana sells 3 one-off in-app purchases and Slitherlink JAM sells 12 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Nonograms Katana holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Nonograms Katana has 6.8K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 83% of Nonograms Katana's written reviews are positive against 63% of Slitherlink JAM's.

UpkeepUpdate frequency

Nonograms Katana ships an update every 3 months, Slitherlink JAM every 113 months. The most recent releases landed on October 29, 2026 and October 8, 2026 respectively.

Scorecard5 real differences · 5 level
Nonograms Katana versus Slitherlink JAM: the parameters behind the verdict, then further details
ParameterNonograms KatanaSlitherlink JAM
PriceFreeFree
Rating4.8 (6.8K ratings) — better4.5 (8 ratings)
Positive reviews82.9% of reviews — better62.5% of reviews
Number of ratings6.8K — better8
Update frequencyEvery 3 months — betterEvery 113 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better16.0
Further details — not scored
Size27 MB4 MB
Age rating12+4+
DeveloperUcdevs Interaction DOOJ&M Rapid Application Development, LLC.

Customer experience

Nonograms Katana

All ratings6,245 ratings
Positive97.2%
Neutral1.7%
Negative1.1%
Written reviews339 reviews
Positive82.9%
Neutral5.3%
Negative11.8%

Slitherlink JAM

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews8 reviews
Positive62.5%
Neutral12.5%
Negative25.0%

Bugs and requests

Nonograms Katana

Reported bugs

5 issues
  • Puzzle progress not saving
  • Puzzle images not loading
  • Freezing/crashing on larger puzzles
  • Ads not playing properly
  • Compatibility issues with newer iOS versions

Requested features

7 requests
  • Dark mode option
  • Ability to rearrange/move puzzle pieces
  • Difficulty ratings for puzzles
  • Automatic line/row completion
  • Ability to follow/subscribe to users
Show 2 more
  • Notification system for new puzzles
  • Diagonal line drawing tool

Slitherlink JAM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Nonograms Katana

One-time3
  • 80 Hints$0.99
  • 200 Hints$1.99
  • VIP version$2.99
12 purchases

Slitherlink JAM

One-time12
  • Auto Remove Corner's Extra Sides$0.99
  • Auto Remove extras from 0's$0.99
  • Envelope of 10 Hints$0.99
Show 9 more
  • Auto-remove from 1's, 2's, & 3's$1.99
  • Handful of 25 Hints$1.99
  • Shoebox of 40 Hints$2.99
  • Armful of 75 Hints$4.99
  • Crate of 100 Hints$5.99
  • Truck load of 250 Hints$9.99
  • Train car full of 1000 Hints$19.99
  • A Boat-load of 10,000 Hints$49.99
  • A Galaxy of Unlimited Hints$99.99

Questions

Is Nonograms Katana free?
Nonograms Katana is free to download, with in-app purchases available.
Is Slitherlink JAM free?
Slitherlink JAM is free to download, with in-app purchases available.
Which has better reviews, Nonograms Katana or Slitherlink JAM?
Nonograms Katana is rated higher. Nonograms Katana averages 4.8 out of 5 from 6.8K ratings, while Slitherlink JAM averages 4.5 from 8 ratings.
Do Nonograms Katana or Slitherlink JAM have ads?
Neither Nonograms Katana nor Slitherlink JAM shows ads.
Which is updated more often, Nonograms Katana or Slitherlink JAM?
Nonograms Katana ships an update every 3 months, and Slitherlink JAM every 113 months. Most recently, Nonograms Katana was updated on October 29, 2026 and Slitherlink JAM on October 8, 2026.

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