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API Ninjas Sudoku vs KDPEasy

A neutral price comparison from published prices (source linked next to each, with the date checked). Sumbloom API is shown as a third option because CyberMax makes it.

What buyers in this category compare on: Price per generated puzzle (per API request) and output format (JSON grid vs printable SVG/PNG).

	API Ninjas Sudoku	KDPEasy	Sumbloom API (CyberMax)
Paid plans	Developer $39/100,000; Business $99/1,000,000; Professional $199/10,000,000 (shared API Ninjas quota); JSON only \| yearly: '34% off' yearly	Starter $19/mo 35 credits; Pro $49/mo 100 credits; Power User $79/mo 250 credits; includes sudoku/word search/crossword/maze creators (no kakuro/kenken listed) \| PAYG: Credits purchasable individually (rates not shown) \| yearly: '2 months free' banner	Sumbloom API Starter: 10,000 puzzles a month: $5/month Sumbloom API Pro: 100,000 puzzles a month: $15/month Sumbloom API Starter yearly: 10,000 puzzles a month, billed yearly: $50/year Sumbloom API Pro yearly: 100,000 puzzles a month, billed yearly: $150/year
Free	Free tier with key (3,000 calls/mo shared); commercial use not permitted on free	None for generators (3 free covers)	free 50/day
Source	api-ninjas.com, 2026-09-27	www.kdpeasy.com, 2026-09-27	CyberMax store, live

Reading the table

API Ninjas Sudoku free tier: Free tier with key (3,000 calls/mo shared); commercial use not permitted on free. KDPEasy free tier: None for generators (3 free covers).
Convert each plan to the unit you use before comparing; plan names and quotas are not equivalent across vendors.
Both pages were read on the dates above; vendors change prices, so open the source links before you decide.

Get Sumbloom API Starter: 10,000 puzzles a month: $5/month Try it All plans

More: API Ninjas Sudoku alternatives · KDPEasy alternatives · All Sumbloom API comparisons

Cite this page: CyberMax, "API Ninjas Sudoku vs KDPEasy (and Sumbloom API): pricing compared (2026-09-27)", https://cybermaxtools.com/compare/rivals/api-ninjas-sudoku-vs-kdpeasy/ (prices checked 2026-09-27). Each rival price is quoted from the source linked next to it, on the date shown.

Product names are trademarks of their owners, used only to compare published prices.