Articles About spaced repetition
Thai Alphabet: All 44 Letters, Ranked by Real Use
We counted 142.7 million letters of real Thai. Learn the 44 consonants in this order and you can sound out 60% of words after two days, not 6%.
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9 Nov
Hardest Language to Learn: 59 Languages Ranked by Hours
Arabic, Mandarin, Cantonese, Japanese and Korean take an English speaker 88 weeks of full-time study. Here is the current FSI list, checked and explained.
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16
23 Oct
How Much Does Duolingo Cost in 2026? Super, Family, Max
Duolingo's courses are free, but the US App Store lists six different prices for Super. Every plan, what it adds, and how to pay less, checked 2026-10-13.
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13 Oct
Rosetta Stone vs Babbel (2026): Prices, Studies, Verdict
Rosetta Stone vs Babbel in 2026: dated US prices, 25 vs 13 languages, how far each course goes, and what the company-paid studies really show.
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12 Oct
Rosetta Stone vs Duolingo (2026): Prices, Studies, Verdict
Rosetta Stone vs Duolingo in 2026: the new Sapphire app, dated prices, 25 vs 40 languages, and what the company-paid studies really show, so you can pick one.
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11 Oct
How to Improve Your Vocabulary: 7 Methods That Work
Most vocabulary advice says "read more." Here is what research says it takes to learn a word for good, plus a 10-minute daily routine and tools with prices.
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10
4 Oct
Babbel vs Duolingo (2026): Prices, Studies, Verdict
Babbel vs Duolingo compared on 2026 prices, free tiers, course levels and the research behind each app, so you can pick the one that fits your goal.
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2 Oct
Anki for Language Learning: Settings, Decks and Daily Load
How to use Anki for a new language: how many new cards a day you can keep up with, the settings that matter, which cards work, and shared decks rated.
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12
30 Sep
How to Study With Flashcards: 7 Rules From the Research
Seven flashcard habits tested in real studies: when to flip, when to drop a card, how big a stack, how many new cards a day, and how far apart to review.
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12
28 Sep
