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80 tools for PDFs, images, money and everyday maths, practical guides and Android apps. Whatever you type or upload stays on your device.
No accountYour files are not uploadedWorks offline8 Android apps
Areas
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Each area brings together the tools, guides and data for one need, with its own look and menu. The areas are in Portuguese for now; the tools themselves are in English.
- Work (Brazil) Net salary, severance, vacation, 13th salary and FGTS CLT calculators →In Portuguese
- Investments Brazilian indicators, funds and calculators Indicators and funds →In Portuguese
- Education Printable activities, languages and tips Activities by age →In Portuguese
- Creators Images, memes, stickers and video Tools + emojis →In Portuguese
- Developers Tools, architecture, SOLID and design patterns Tools + topics →In Portuguese
- Health & family Pregnancy, BMI, age, parties and dates Calculators →In Portuguese
- Women Cycle, pregnancy, maternity leave, money and rights Cycle, maternity, rights →In Portuguese
- Maths Percentages, rule of three, quadratic formula, GCD and LCM step by step Worked solutions →In Portuguese
- Courses Free video courses with goals and progress Open courses →In Portuguese
- Artificial intelligence LLMs, RAG, agents, memory and MCP explained Topics with diagrams →In Portuguese
- All tools 80 tools by subject, in English 80 tools →
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Guides
Learn the basics, then do it yourself
How to Organise a Secret Santa Online: Rules, Budget and a Fair Draw
Run a Secret Santa by link: a fair draw nobody can peek at, a budget that suits everyone, wish lists and a date — for family, friends or the office.
Read the guide →Brazil's 13th Salary in 2026: How to Calculate It, When It Is Paid and the Net Amount
How to work out the full and proportional 13th salary in Brazil, the dates of the two instalments, the INSS and income-tax deductions and worked examples with 2026 figures.
Read the guide →Vacation Pay in Brazil 2026: The One-Third Bonus and Selling 10 Days, Explained
What you get for vacation in Brazil with the constitutional one-third bonus, how selling 10 days (abono pecuniário) works, INSS and income-tax deductions, deadlines and worked examples.
Read the guide →Android apps
On your phone too
Apps we make, on Google Play: no trackers, and they work without internet.
PDF Scan 
PDF Reader Pro 
Grana Guru 
MetaCalc 
Authra 
Audiva Music 
FotoGrid Pro 
WorldCoffee How it works
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