American teachers work an average of 53 hours a week, compared with 44 for similar working adults, and roughly a quarter of that time falls outside their contracts (RAND Corporation, 2024). AI tools are starting to claw some of that time back: teachers who use AI at least weekly save an average of 5.9 hours a week, which adds up to about six weeks over a school year (Gallup and the Walton Family Foundation, 2025).
That same survey found six in ten K-12 teachers used an AI tool for their work during the 2024-25 school year. The most common uses were exactly the kind of repetitive prep that eats evenings and weekends: planning lessons, building worksheets, and adapting materials for different students.
This guide covers the AI tools on just build things that do that work. Everything here runs in a browser, so it works on a school laptop, a phone during a planning period, or a tablet at the kitchen table. The point is not to replace teaching. It is to hand off the mechanical parts so you can spend your hours on the parts that need a human.
Planning is where teachers report spending the most AI time, and it is where the time savings are biggest (Gallup, 2025). The trick is to use AI for the first draft and the scaffolding, then bring your own judgment to the final version.
If you already have the source material, the AI Study Guide Generator reads a PDF (a textbook chapter, an article, a handout) and turns it into a structured guide with key points and review sections. The Key Terminology Extractor pulls the vocabulary students actually need and writes definitions, which saves you building a word wall from scratch.
For longer documents, the PDF Summarizer condenses dense reading into the parts that matter for your lesson, and the Timeline Generator pulls events and dates out of a history or science text into a sequence you can project or hand out.
When you need original explanatory text rather than something derived from a source, the AI Writer covers most classroom writing. The How-To Guide writer is good for step-by-step lab or activity instructions. The Paragraph Writer drafts short explanatory passages at a level you specify, and the Article Generator handles longer background readings. For structuring a unit, the Content Outline tool sketches the sequence before you fill it in.
Two more that come up constantly: the FAQ Generator drafts answers to the questions a topic always raises, and the Quote Generator and Speech Writer help with morning meeting prompts, assembly remarks, or end-of-year send-offs.
Practice materials are pure repetition to build, which makes them an obvious thing to automate. This is one of the few places where AI output is close to classroom-ready with light editing.
The AI Flashcard Generator takes a topic or a block of text and produces front-and-back cards you can use for review or hand to students for self-study. If your content lives in a document, the Flashcard Content Generator pulls cards straight out of a PDF, so a single reading becomes a study set without retyping anything.
The AI Quiz Generator builds quizzes from a topic or your own notes, with question types you can adjust. To generate questions directly from assigned reading, the Interactive Quiz Generator works from the PDF itself, which keeps the assessment tied to what students actually read.
For a quick formative check or a bit of low-stakes review, the Fun Tests and Quizzes collection gives you ready-made formats you can adapt.
Building a study set tonight? Drop your reading into the AI Flashcard Generator or AI Quiz Generator — free, no signup, and you get a usable draft in under a minute.
A real caution: always read AI-generated quiz questions before you assign them. Models occasionally write a question with no correct answer among the options, or mark the wrong one as correct. Treat the output as a first draft from a fast but careless teaching assistant.
AI cannot and should not assign final grades, but it can speed up the feedback loop. The honest framing here is "support," not "grading." You stay in the loop on every judgment that affects a student.
The Grammar and Style Checker flags mechanical issues in student writing so you can spend your comments on ideas and argument instead of comma splices. The Proofreader and Grammar Checker does the same for documents, and the Jargon Explainer is useful when you are marking up technical or unfamiliar material and want plain definitions on hand.
For your own feedback writing, the Audience Analyzer helps you check that a parent email or comment lands at the right tone and reading level before you send it.
When students bring you a problem they are stuck on, the Homework Helper and Question Solver walk through worked solutions, which is handy for building your own answer keys or modeling a method at the board. There is also an image-based AI Homework Solver if the problem is a photo of a worksheet.
A single class can span several reading levels, plus English-language learners and students with IEPs. Adapting materials for all of them is exactly the "modifying materials to meet student needs" work that teachers report doing with AI (Gallup, 2025). It is some of the highest-value automation available.
Before you assign a text, the Readability Score tells you what grade level it actually sits at, and the Text Complexity Analysis breaks down what makes it hard. The Reading Time Calculator gives you a realistic estimate of how long an assignment takes, which helps with pacing and homework load.
When a text is too hard, the Plain Language Converter rewrites it in simpler language while keeping the meaning, and the PDF Simplifier (ELI5) takes a dense document and explains it as if to a beginner. Together they let you produce a leveled version of the same reading for the students who need it.
For ESL students, the Language Complexity for ESL tool flags the words and structures most likely to trip up a non-native reader, so you know what to pre-teach or swap out. The Accessibility Checker reviews your materials for accessibility issues, and the Accessibility Analysis tool helps you write alt text for images and diagrams so screen-reader users get the same information as everyone else.
For students who learn better by listening, Text to Speech turns any reading into audio, which doubles as an accommodation and a way to offer an audiobook version of a handout.
Visuals and audio make material stick, and you no longer need design software or a clip-art subscription to make them.
The AI Illustration Generator and its Illustration Generator produce custom images for slides, worksheets, and anchor charts, so you can illustrate a specific concept instead of settling for whatever a stock search returns. The Coloring Page Generator makes printable line-art pages, which are genuinely useful for early grades, vocabulary review, and calm-down corners.
If you have a photo of board notes or a printed page you want digitized, OCR Analysis and Text Extraction pull the text out so you can reuse it.
The AI Study Music Generator creates instrumental background tracks for independent work time or test settings, where lyrics would be a distraction. The broader AI Music Generator can produce transition cues, calm-down music, or a short theme for a class activity.
For recorded content, Speech to Text transcribes a recorded lecture or a student presentation into text you can search, share, or turn into notes. Paired with Text to Speech, you can move fluidly between written and spoken versions of the same material.
The same tools that prep your lessons can produce things students use directly: study sets, leveled readings, practice quizzes, and audio versions of assignments. A practical workflow looks like this: take one source reading, run it through the Study Guide Generator, the Flashcard Content Generator, and the Interactive Quiz Generator, then make a simplified version with the PDF Simplifier (ELI5) for students who need it. One reading becomes a full differentiated set in the time it used to take to build one worksheet.
The Essay Writer is worth a specific note. Use it to model structure and show students what a thesis or a body paragraph looks like, not to produce work that gets turned in. Showing a class an AI draft and then critiquing it together is a strong lesson in why the human revision matters.
Always review before you assign. AI is a fast first-drafter, not a fact-checker. Read every quiz key, definition, and worked solution before it reaches a student. The error rate is low but not zero, and a wrong answer key erodes trust fast.
Give it your context. Generic prompts produce generic output. Tell the tool the grade level, the reading level, the standard you are targeting, and the student population. "Third-grade reading level, multiplication, ten word problems" beats "make a math quiz" every time.
Chain tools instead of looking for one magic button. Use the Study Guide Generator for the framework, the Flashcard Generator for practice, and the Plain Language Converter for a leveled version. Each tool does one job well.
Check the reading level before you hand anything out. Run drafts through the Readability Score. AI tends to write above the level you asked for unless you check.
Keep students' work and data out of public tools when policy requires it. Follow your district's data-privacy rules. Use these tools for your own prep and for de-identified material, and check your school's AI policy before putting student work into anything.
Be transparent with students about AI use. Modeling honest, labeled AI use is itself a lesson in the academic-integrity norms you want them to follow.
Many of the tools on just build things are free to use with no signup. Some advanced features and premium generators require a subscription. Each tool's page lists its availability and any usage limits, so check there before building a lesson around one.
Using AI to prepare your own materials (planning lessons, drafting worksheets, building quizzes) is teacher productivity work, the same category as using a textbook publisher's resources or a worksheet site. Six in ten teachers already do it (Gallup, 2025). What needs care is student-facing use and student data. Follow your district's AI and data-privacy policy, keep identifiable student information out of public tools, and be transparent with students and families about how you use AI.
The honest answer is that detection is unreliable, so leaning on it is risky. The more durable approach is designing assessments that are harder to outsource: in-class writing, oral defenses of work, process artifacts like outlines and drafts, and questions tied to specific class discussions. Teaching students when AI use is appropriate (study help, brainstorming) versus when it is not (submitting generated work as their own) tends to work better than trying to ban it outright. Worth knowing: a quarter of teachers already think AI does more harm than good in K-12, rising to 35% at the high school level (Pew Research Center, 2024), so skepticism in your building is normal and worth talking through.
It can support grading, not do it. Tools like the Grammar and Style Checker catch mechanical errors so you can focus comments on substance, and the Homework Helper helps you build answer keys. But final grades are a professional judgment that affects students' records, and that judgment should stay with you. Treat AI as a sorting and first-pass tool, never the final word.
Start with two that pay off immediately: the AI Quiz Generator for a quick formative check, and the PDF Simplifier (ELI5) or Plain Language Converter for leveling a reading you already use. Both solve a problem you have this week, which is the fastest way to see whether AI fits your workflow.