Blog
Practical guides, app notes, and small things worth learning.
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How to Use CEFR Vocabulary Lists: A1 to C2 Practice
Choose an English vocabulary list, practise words in context and check what you can recall. A practical A1 to C2 study routine without word-count targets.
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An auto clicker for Android with no ads, no SDKs and no internet
Auto Clicker: Auto Tap & Swipe is free with no ads, no purchases and no account. It has no internet permission and no third-party libraries, and still does groups, chains, timers and 10-point taps.
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How to put photos into one PDF on Android, free
Two ways to make one PDF from several photos on Android: the built-in print to PDF route and the Image to PDF tool in Honest PDF Scanner. What each one does, where it falls short, and what to check.
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How many countries are in the world? 195, mostly
The usual answer is 195: the 193 UN members plus the Vatican and Palestine. But Taiwan, Kosovo and Western Sahara all complicate the count. Here is where the number comes from, a table by continent, and how to learn them.
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24 math riddles with answers, from easy to tricky
Twenty-four math riddles from our puzzle app, sorted from warm-up to properly hard. Answers are hidden, so you can actually try before you peek. Each one comes with a short explanation.
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How to Restore Old Photos on Your Phone (Scratches, Color)
Repair scratches, fix fading and add color to old family photos on Android. Most of the result comes from a clean print and a good scan, then an app handles the rest. What AI restoration can and cannot bring back.
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Polish alphabet and pronunciation: all 32 letters
Polish looks scary on paper but is very regular once you know the rules. Here are the 32 letters, the digraphs, English sound matches and common beginner traps.
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How many weeks in a year? 52, plus a day or two
A year has 52 weeks and one extra day, or two in a leap year. That leftover is why some years get a week 53 and some payrolls a 27th payday. Here is the math.
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Dope Capybara is now on X, TikTok and YouTube
We opened accounts on X, TikTok and YouTube. Expect daily math puzzles, the year's progress as a percentage, short app previews and notes when an update ships.
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Chad vs Romania Flag: Differences Side by Side
Compare the Chad and Romania flags side by side. Both have blue, yellow and red stripes; the darker blue in Chad's reference flag is the useful clue.
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How to resize a video without cropping
Keep the whole frame when changing video size. Compare fitting, padding and stretching, with a worked 1920x1080 to 1080x1920 example.
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Convert Horizontal Video to Vertical on Android (9:16)
Turn a landscape video into a 9:16 vertical clip on Android in five steps: crop to fill, or fit the whole frame. Free 1080p export, no watermark.
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Learn Polish vocabulary as a Russian or Ukrainian speaker
A practical Polish vocabulary routine for Russian and Ukrainian speakers: useful phrases, false friends, and ways to practise beyond recognising words.
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Average vocabulary size by age: what the research measures
Compare vocabulary estimates by age, learn how word families differ from lemmas, and see why children's word counts cannot be compared with adult test scores.
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How many words does a B2 speaker know?
B2 has no official word count. One research scale puts it at 3,250 to 3,750 of the 5,000 most frequent words. See what that number means and what to study.
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Native speaker vs learner vocabulary
Compare vocabulary estimates for native speakers and learners. Check the counting units, understand text coverage and find words to practise.
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How to learn all the flags of the world (that actually stick)
196 flags sounds impossible until you stop cramming and start spacing them out. Here's the method that works, plus a free flags quiz to test yourself right now.
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How to Unblur a Photo on Android: What Works
Slightly soft or small photos can be sharpened on your phone. Heavy motion blur and missed focus cannot be fully fixed. Here is what unblurring can and cannot recover, with steps in the Zuriva app, a free browser option and honest limits.
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Two new apps dropped (and nobody got hurt)
Fresh from the capybara labs: Logic Math: IQ Riddles and Cropzen, a no-nonsense video crop and trim tool. Two more reasons your home screen looks calm.
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How many English words does the average person know?
One study estimated 42,000 lemmas for a 20-year-old native speaker. See why that differs from word-family counts and what your own test can tell you.
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Hello, world!
We're Dope Capybara, a tiny indie mobile studio shipping calm, useful and slightly weird apps. Here's the elevator pitch.