BrainBuff.app
Anki
PhET Interactive Simulations
Quizlet
Brainscape
Study Buddy AI
LabsLand
Kids Preschool Learning Games
ForthWrite
Superhuman
Gemini
Lavender
Mailmeteor
Spark Mail
BrainBuff turns your study materials into an engaging learning experience powered by AI. Upload a PDF, PowerPoint, or YouTube video and BrainBuff instantly generates flashcards, quizzes, and boss battle challenges tailored to your content.
How it works: Drop in your lecture slides or textbook PDF. BrainBuff's AI reads and understands the material, then creates flashcards with spaced repetition scheduling, multiple-choice quizzes, and gamified boss battles โ all in seconds. No more spending hours manually creating Anki cards.
Study smarter, not harder: Your AI study buddy tracks what you know and what you struggle with. When you get a question wrong, it explains the concept in context โ not a generic answer, but one based on your specific material. Over time, it adapts to focus on your weak spots.
Stay motivated: Earn XP for every study session, level up as you master topics, and maintain daily streaks. Boss battle mode turns revision into a challenge you actually want to come back to.
Key features: - AI-generated flashcards from PDFs, PowerPoints, and YouTube videos - Boss battle mode with timed challenges - AI tutor that explains concepts when you're stuck - Spaced repetition scheduling - XP, levels, and streak tracking - Progress analytics per topic
Free to start, no credit card required.
ForthWrite is an AI email writing assistant for Gmail and Outlook that learns your writing style from your real sent mail. The more you use it, the more it sounds like you. Get smart drafts in seconds, auto-draft replies before you open your inbox, and maintain your personal voice at scale. Free to start, no credit card required. Works inside Gmail and Outlook on the web.
How it works
ForthWrite captures your tone, sentence rhythm, and sign-offs from your actual sent emails, then uses that profile to generate drafts that match how you write, not a generic AI voice. Every draft you edit or send improves the model over time.
Key features
Who uses it
Professionals who send high volumes of relationship-critical email: lawyers, financial advisors, recruiters, account executives, founders, and anyone who wants their inbox handled without sounding like a chatbot wrote it.
Pricing
Free tier includes 10 drafts per week with no credit card required. Paid plans start at $12/month and include unlimited drafts, custom persona prompts, and auto-draft.
BrainBuff.app ForthWriteBrainBuff.app's answer
React, TypeScript, Node.js, Express, Tailwind CSS
ForthWrite's answer:
Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API
BrainBuff.app's answer
BrainBuff is the only study app that combines AI-powered content generation with real gamification. Upload a PDF, PowerPoint, or YouTube video and get flashcards, quizzes, and boss battles generated in seconds โ not generic questions, but ones tailored to your actual material. Your AI study buddy grows with you, tracking what you struggle with and adapting accordingly. Most study tools make you choose between effective and engaging โ BrainBuff is both.
ForthWrite's answer:
ForthWrite learns your writing style from your actual sent mail, not a generic prompt. Every draft sounds like you wrote it because it was trained on how you actually write. It also auto-drafts replies before you open your inbox, so your email is partially handled before your day starts.
BrainBuff.app's answer
Unlike Anki, you never have to manually create a single card โ AI does it from your own materials. Unlike Quizlet, BrainBuff goes beyond basic flashcards with boss battles, XP systems, and an AI tutor that explains concepts when you get stuck.
Unlike ChatGPT, your study content is structured, tracked, and gamified so you actually come back to it. And it's free to start with no credit card required.
ForthWrite's answer:
Most AI email tools give you a blank box and a "write for me" button. ForthWrite builds a voice profile from your sent history and gets more accurate with every draft you edit or send. Unlike ChatGPT or Gemini, it works natively inside Gmail and Outlook with no copy-paste. Unlike Lavender, it writes the draft, not just scores it.
BrainBuff.app's answer
College and university students who want to study smarter but find traditional tools like Anki too tedious to set up or too boring to stick with. Also high school students preparing for AP/IB exams, and self-learners studying for professional certifications
ForthWrite's answer:
Professionals who send high volumes of relationship-critical email and cannot afford to sound generic: lawyers, financial advisors, recruiters, account executives, consultants, and founders managing their own inbox.
BrainBuff.app's answer
BrainBuff was born from a common frustration: spending more time creating study materials than actually studying. The founders realized that the science of effective studying (spaced repetition, active recall, interleaving) was well-established, but the tools implementing it were either tedious to use or lacked engagement. BrainBuff bridges that gap by using AI to eliminate the setup work and gamification to make the learning loop addictive.
ForthWrite's answer:
Built out of frustration with AI writing tools that produce text that sounds nothing like the person sending it, and as a way to handle large amounts of daily email. The core insight was that your sent mail is the best training data you already have, and no tool was using it.
I built ForthWrite because I kept sending emails that sounded like they came from the same generic AI as everyone else. After launching it, I still use it for my own inbox every day, which is about the most honest endorsement I can give.
The Chrome extension lives inside Gmail and Outlook on the web. Open a thread, hit Alt+Shift+D, and a draft comes back in your voice, not a template. The free tier is real: 10 drafts per week, no API key, no credit card. Voice matching is included on free, because that is the point.
What keeps it useful compared to Gemini or a chat tab: it learns from what you actually send. Every edit you make before hitting send becomes a signal. Over time the drafts drift closer to how you really write, and the dashboard shows the improvement curve so you can see it happening.
The web compose surface lets you draft from forthwrite.ai without installing anything, useful for people who want to try before committing to the extension.
Standard adds recipient-aware and intent-aware drafting plus AI coaching. Pro adds auto-draft (replies waiting when you open Gmail), batch replies, and Prompt Lab for version-controlling your prompts. Teams adds a shared persona and seat-level analytics.
ForthWrite is not for everyone. If you just need quick replies and tone does not matter, Gemini is free and already in your inbox. ForthWrite is for people where tone does matter: client communication, relationship-driven threads, external correspondence where sounding off costs something real.
Disclosure: I am the founder and use it daily. Happy to answer questions in the comments.
Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
Superhuman - Superhuman is an email management tool.
PhET Interactive Simulations - Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.
Gemini - Gemini, formerly known as Bard, is a generative artificial intelligence chatbot developed by Google. Based on the large language model (LLM) of the same name, it was launched in 2023 in response to the rise of OpenAI's ChatGPT.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
Lavender - Realtime coaching for sales emails.