Result will appear here.
Topic Sentence Generator
Third-party service
Generate a clear, engaging topic sentence with AI — the opening line that introduces a paragraph's main idea, with a brief explanation.
Input
Optional. Add as much detail as you like (up to 500 characters).
Output
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More ways to use this tool
REST API
curl -X POST https://api.iotools.cloud/v1/tool/ai-writer/topic-sentence \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"context": "a paragraph arguing that public libraries are es…"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `ai-writer__topic-sentence` tool (Topic Sentence Generator) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.
| Cost per API/MCP call | From 24 credits |
|---|---|
| Free-plan API/MCP cap^ | 360 credits/month |
| Need more credits? | View pricing |
^ The most you can spend on this tool over API/MCP per month on the free plan. Buying a credit pack removes this cap, same as Builder.
Also available with
Guides
A clear, engaging topic sentence for a paragraph — the opening line that introduces the main idea — with a brief note on why it fits.
How to use it
- Describe the paragraph's subject in Extra instructions — what it's about and what point it's making.
- Press Generate.
- Copy the result, or download it as a text file.
What it costs
This tool costs credits — the Generate button shows the exact price live before you run it. Credits reset daily, and a run that fails costs nothing at all.
Is what I type sent anywhere?
Yes — the text you type is sent to the AI provider that writes the topic sentence, because it's part of the prompt. Don't paste anything confidential into it.
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