Free online study tools
Flashcards, quiz generators, study timers, formula references, and learning aids.
Eight tools for coursework, revision and marking, each one small enough to open between lectures. The Citation Generator formats a source into APA 7th, MLA 9th, Chicago, Harvard, IEEE or Vancouver, applies the author rules each style actually specifies — APA switches to an ellipsis after twenty names, MLA inverts only the first author — and can pull title, authors and year automatically when you paste a DOI. That DOI lookup is the one place in this hub that reaches the network: the identifier you paste is sent to the public Crossref API and the returned record fills the form. Everything else you type stays in the tab. The Flashcard Maker builds decks by hand or in bulk from pasted lines, imports .json, .csv and .txt files, tags cards by category, shuffles, schedules each card on a spaced-repetition ladder that steps from one minute through ten minutes, an hour, a day, three days and a week before counting it mastered, and exports either a data file you can re-import later or a printable HTML sheet laid out as cut-out cards for Ctrl+P. The Typing Test measures words per minute and accuracy against sample passages graded easy, medium and hard, or against text you paste yourself, charts speed over the run so you can see where you slowed down, and keeps a history of past attempts in your browser so progress is comparable week to week. The GPA Calculator handles the US 4.0 scale, a 5.0 weighted scale for honours and AP courses, and a 10.0 international scale, weighting each course by credit hours and projecting what a target average would require. Sudoku fills a complete grid with a backtracking solver and then blanks cells to set difficulty — 35 for easy, 45 for medium, 55 for hard, 60 for expert — keeping the original grid as the reference answer behind hints and error highlighting, with pencil marks and undo while you play. Mind Map is a click-to-add node canvas with drag-to-pan, collapsible branches and colour coding, exporting either as SVG for further editing or as a PNG at double resolution. Two of the eight are for students inside the European system rather than the American one. The Danish GPA Calculator works the 7-point scale (7-trinsskalaen) as Danish institutions actually use it: enter each course with its ECTS weight and its mark — 12, 10, 7, 4, 02, 00 or -3 — and it returns the credit-weighted vægtet gennemsnit a transcript, a scholarship committee or an exchange application asks for, which is not the same number as an unweighted mean. The ECTS to GPA Converter handles the two separate things people mean by that phrase and keeps them apart: mapping ECTS letter grades A to F, or the Danish 7-point marks that sit under them, onto an approximate US 4.0 grade point, and working out how many US semester credits a block of ECTS represents. Both are approximations of a conversion no institution performs identically, and both say so on the page. None of the eight needs an account, and nothing is rate-limited or watermarked.
8 tools · always free · no account needed
Citation Generator
APA, MLA, Chicago, Harvard citation formatter
Flashcard Maker
Create and study flashcard decks
Typing Test
Test typing speed with WPM and accuracy
GPA Calculator
Calculate weighted GPA from course grades
Sudoku
Play and solve Sudoku puzzles
Mind Map
Create visual mind maps and brainstorms
Danish GPA Calculator
Weighted average on the Danish 7-point scale, with ECTS letters and an approximate US GPA
ECTS to GPA Converter
Convert ECTS letters or Danish 7-point marks to an approximate US 4.0 GPA, and back
How to choose the right tool
Pick by the stage of study you are at. While you are reading, Mind Map is the tool for turning a chapter into a structure you can see, and it exports SVG so a lecturer or study group can open it in Illustrator, Figma or Inkscape later. While you are memorising, the Flashcard Maker is the one to use: create cards in bulk from pasted lines rather than one at a time, and export the printable HTML sheet if you revise better on paper. When you are writing up, the Citation Generator is the fastest route from a DOI to a correctly punctuated reference, and the style picker matters more than most people expect, because MLA 9th and APA 7th differ in author order, capitalisation and where the year sits. Use the GPA Calculator when you need to know what a remaining module has to score, not just what you have already averaged, and choose the scale your institution actually uses before entering grades, since the 5.0 weighted and 10.0 international scales map the same letters to different points. If you are studying in Denmark, the Danish GPA Calculator is the right page rather than the general GPA Calculator, because the 7-point scale is not linear against a 4.0 scale and weighting is by ECTS rather than by credit hour; use the ECTS to GPA Converter only when an American application explicitly asks for a GPA figure, and quote it as an estimate. The Typing Test and Sudoku are the two that are practice rather than production: the first for keyboard speed with a tracked history, the second for a break that still ends in a solvable board.
Frequently asked questions
Does the Citation Generator send anything to a server?
Only when you use the DOI lookup. In that one case the digital object identifier you paste is sent to api.crossref.org, the free bibliographic API, which returns the title, authors and publication year for that record. Everything else is local: typing a source in by hand, switching between APA, MLA, Chicago, Harvard, IEEE and Vancouver, and copying or downloading the finished bibliography all happen in the tab without a request.
Can I get my flashcards back after closing the tab?
Export them first. The Flashcard Maker keeps your deck in the page while you work, and the download button saves it as a file you can re-import later through the same import control, which also accepts .csv and plain .txt with one card per line. There is a separate printable export that writes an HTML sheet of cut-out cards; open that file and print to PDF. Without an export, closing the tab loses the deck, because nothing is stored on a server.
How is the typing speed calculated?
Words per minute uses the standard five-characters-per-word convention, counted against elapsed time, with accuracy reported separately as the share of characters typed correctly. Speed is also sampled during the run and plotted, which is what shows a mid-test slowdown that a single final number hides. Past attempts are stored in your browser's localStorage on this device, so a history builds up over sessions but never leaves the machine.
Which GPA scale should I use?
Use the one your institution grades on, because the same letter is worth different points in each. The 4.0 scale is the US standard where an A is 4.0. The 5.0 scale is the weighted variant used for honours and AP courses, where the same A in a weighted class is worth more. The 10.0 scale is the international variant common in Europe and parts of Asia. The calculator weights every course by its credit hours, so a 4-credit module moves the average more than a 2-credit one.
Are the Sudoku puzzles always solvable?
Every board starts as a complete, valid 9x9 grid built by a backtracking solver, and cells are then blanked out of it, so at least one solution always exists and the tool keeps that original grid to check your entries and give hints against. Difficulty is set by how many cells are removed: 35 on easy, 45 on medium, 55 on hard and 60 on expert. Finished games are logged to your browser's local storage, so your times survive a refresh but never leave the device.
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