No moat. Still in business.

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Excel add-in for querying tables with SQL, scripting workbooks in C# and building custom Excel functions.

Since 2016

Free plan · Data and spreadsheets · Developers

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Drills you on keyboard shortcuts for editors and work apps with spaced repetition until they become habit.

Since 2012

Free plan · Courses and learning · Individuals and families

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Builder for conversational forms and surveys with logic, offered in the cloud or as a WordPress plugin.

Since 2018

Free plan · Forms and surveys

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Sends your notes from books, podcasts and articles back by email or Telegram on a spaced repetition schedule so you remember them.

Since 2024

One-off payment · Notes and knowledge · Individuals and families

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A cloud workspace for creating, running and sharing marimo Python and SQL notebooks for data work

Since 2024

Developer tools · Developers

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Fixes the mixed content and insecure content warnings a WordPress site shows after it moves to HTTPS.

Website builders

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WordPress plugin for building, selling and running online courses and memberships on your own site.

Free plan · Communities and memberships · Creators and writers

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Gets and renews free Let's Encrypt SSL certificates on cPanel shared hosting without command line work.

Free plan · Security and passwords

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Lets developers share live progress of scripts and jobs through a link, via an API or a tqdm replacement.

Uptime and monitoring · Developers

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Build onboarding for new hires from checklists, quizzes and videos, then track each person through to the end.

Since 2026

Payroll and HR

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An iPhone app that takes Japanese learners from beginner to fluent with one new sentence per flashcard and spaced review.

Since 2015

Courses and learning · Individuals and families

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Make your own flashcard decks and review them on a spaced repetition schedule in the browser.

Since 2015

Free plan · Courses and learning · Individuals and families

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A browser extension that saves and highlights words you look up on web pages, then drills them with flashcards.

Since 2020

Free plan · Courses and learning · Individuals and families

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Desktop data analysis app where you ask about your data in plain English and get Python code, charts and notebooks run on your computer.

Since 2017

Data and spreadsheets

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Note app for students that builds flashcards, quizzes and summaries from notes and PDFs with spaced repetition.

Since 2021

Free plan · Courses and learning · Individuals and families

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Flash card app for learners to keep their own word lists and practise them with spaced repetition on Apple devices.

Courses and learning · Individuals and families

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A Persian language tool for building online surveys, quizzes and forms and analysing the answers.

Free plan · Forms and surveys

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Flashcard app that uses spaced repetition so learners review hard cards more often, with sync between devices.

Courses and learning · Individuals and families

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Describe a form in plain text and get questions, logic and design drafted for you, then edit it, free with unlimited responses.

Since 2024

Free plan · Forms and surveys

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Flashcard app for iPad and iPhone where students draw, type or add images to cards and review them with spaced repetition.

Since 2024

Courses and learning · Individuals and families

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A study app for students with spaced repetition flashcards, made from notes and PDFs, and scheduled around your calendar.

Free plan · Courses and learning · Individuals and families

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Build popups, multi-step forms, quizzes and on-site widgets to collect leads and sales from website visitors.

Free plan · Forms and surveys

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Spreadsheet that links to databases and files and lets AI write the formulas, Python and charts for you.

Since 2023

Data and spreadsheets

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A free e-learning platform from Greece's GUnet for schools and universities to run online courses and exercises.

Free · Courses and learning · Schools and tutors

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Open-source form builder for surveys, quizzes and lead capture with conditional logic, hosted or on your own server.

Since 2024

Free plan · Forms and surveys

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Build step-by-step forms for surveys, leads and quizzes, with logic, webhooks and unlimited responses on the free plan.

Free plan · Forms and surveys

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Teaches English, Spanish, French and other languages through song lyrics, with spaced repetition for new words.

Since 2024

Courses and learning · Individuals and families

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Flashcard maker that schedules reviews by spaced repetition, with dictionaries and text to speech for language learners.

Since 2024

Free plan · Courses and learning · Individuals and families

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Learn to read Arabic with alphabet lessons, graded stories and flashcards that schedule reviews around your memory.

Since 2026

Free plan · Courses and learning · Individuals and families

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An iPad app that teaches children in grades K to 5 to spell new words using spaced repetition and a mock spelling bee.

Since 2026

Courses and learning · Individuals and families

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WordPress form builder for contact forms, surveys, quizzes and calculators, with entries shown as listings or directories.

Free plan · Forms and surveys

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A Mac PDF reader for studying hard documents: ask questions about the page, get summaries and quizzes, and have passages read aloud.

Since 2026

Notes and knowledge · Individuals and families

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Upload a textbook and get chapter problems, feedback on your written answers and spaced recall reviews, for self-learners.

Since 2026

Free plan · Courses and learning · Individuals and families

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WordPress plugins that give course sites proper quizzes, graded assignments and checkable certificates, free to start.

Free plan · Courses and learning · Creators and writers

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Students upload slides or notes and get practice quizzes and spaced-repetition flashcards made from them.

Since 2025

Free plan · Courses and learning · Individuals and families

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Drag and drop form builder for WordPress sites, with calculations, email alerts and paid add-ons for payments and CRMs.

Free plan · Forms and surveys

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A flashcard app that makes study cards from your PDFs, articles and photos and schedules reviews so you remember them.

Since 2026

Free plan · Courses and learning · Individuals and families

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WordPress plugin for making popups, sticky bars, optin forms and quizzes to turn visitors into leads.

Free plan · Forms and surveys

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WordPress plugin for building chat-style forms, surveys and quizzes that show one question at a time and can take payments.

Forms and surveys

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Short Spanish stories pitched at the words an A2 to B1 learner already knows, with unknown words brought back for review.

Since 2026

Free plan · Courses and learning · Individuals and families

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WordPress plugin that lets course creators, schools and coaches build lessons, quizzes and certificates, and sell access.

Free plan · Courses and learning · Agencies

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Save new words from what you read or watch, get AI definitions and examples, then review them with FSRS flashcards on Apple devices.

Since 2025

Free plan · Courses and learning · Individuals and families

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Pools GPUs and CPUs from many cloud providers and your own servers so developers can run large data jobs in one place.

Since 2026

Developer tools · Developers

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Connect Claude or ChatGPT so they turn what you read into flashcards, then review them on any device.

Since 2026

One-off payment · Courses and learning · Individuals and families

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Language learning app where you add the words you need and it builds practice sessions around them, in 20+ languages.

Since 2025

Free · Courses and learning · Individuals and families

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WordPress plugin for building, running and selling online courses with quizzes, assignments and certificates.

Courses and learning · Creators and writers

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An iPhone app that builds a short-lesson course on any subject you choose, with reviews, streaks and an AI tutor.

Since 2026

Courses and learning · Individuals and families

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WordPress plugin for creating, selling and running online courses with quizzes and certificates.

Free plan · Courses and learning · Creators and writers