Calm, useful, slightly weird mobile apps.
Indie mobile studio crafting calm, useful, slightly weird apps.
Featured apps
Hand-picked from our growing catalog.
Video Crop & Trim: Cropzen
Crop and trim video fast. No timeline, no watermark, no sign-up.
English Vocabulary Size Test
Find out exactly how many English words you know, in about 2 minutes.
GeoSpark: World Geography Quiz
Learn the flags, capitals and countries of the world, one country at a time.
Logic Math: IQ Riddles
120 hand-built logic & math riddles that make you think, not grind.
From the blog
Devlogs, releases, and the occasional opinion.
Average vocabulary size by age, from toddler to adult
How many words a 2-year-old, a 5-year-old, a teenager and an adult native speaker actually know, why the published figures disagree so wildly, and where learners fit on the same scale.
How many words does a B2 speaker know? Vocabulary size by CEFR level
A1 to C2, with the word counts behind each level, what those numbers let you actually do, and why two people at the same CEFR level can differ by thousands of words.
Native speaker vs learner vocabulary: how big is the gap really?
A native speaker knows roughly four times more words than a strong learner, and it matters far less than that ratio suggests. What the gap is made of, and how much of it you actually need to close.