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Buy ebooks with browser and downloadable reading routes

Molecular-biology quantities with visible formulas

Calculators for primers, reaction setup and molecular quantities

Check TLS protocols and ciphers from the command line

Validate route origins against RPKI data

Inspect a sample message for deliverability problems

Compare PDF pages visually and export highlighted differences

Count text and set writing goals

Build a resume while checking the free export and renewal boundary

AI study platform for homework help, notes, flashcards, quizzes and exam prep.

Short programming tutorials beside exercises and references

Count words and inspect text statistics

Receipt rewards with personalised purchase offers

Search checkout coupons through a browser extension

Original series, films and separately labelled viewing offers

Preflight and fix print PDFs inside Acrobat

Compare answers from ChatGPT, Claude, Gemini and other AI models side by side.

Solve and inspect mathematical expressions

Algebra and calculus through dedicated solvers

Mathematical solvers alongside lessons and formulas

Statistical tests, power analysis and descriptive tools

Focused browser calculators for statistical questions

Focused statistics tools for research calculations

Browser tools for beam and structural calculations