If you're looking for a free tool that explains complex text like you're 5, you've probably found two options: ELI5 AI and JustELI5. Both are free, both use AI to simplify text, and both target the "explain like I'm 5" use case. But they work differently in ways that matter.

Here's a side-by-side comparison to help you pick the right one.

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Quick comparison table

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How they work

JustELI5: One explanation, one level

JustELI5 takes your input text and produces one simplified explanation. The flow is simple: paste text, click "Explain This," read the result. It also has a library of pre-explained topics you can browse, and categories for common subjects.

The strength of JustELI5 is its simplicity — one input, one output, done. It's good when you just need a quick plain-English version of something and don't care about the specific reading level.

ELI5 AI: Four levels side-by-side

ELI5 AI takes your input text and produces four simplified versions simultaneously, displayed as color-coded cards side-by-side:

1. For a 5-year-old — simplest possible language, short sentences
2. For a 10-year-old — plain English with basic vocabulary
3. For a teenager — conversational, slightly more complex concepts
4. For an adult — clear but assumes general knowledge

The key difference: instead of choosing one level, you see all four at once. This matters because "simplify" means different things to different audiences. A researcher explaining a paper to their product manager needs a different level than the same researcher explaining it to their grandmother.

ELI5 AI also scores each output with Flesch-Kincaid readability metrics. If a level comes back too complex for its target audience, the tool automatically re-simplifies it. You get verified readability, not just a label that says "simplified."

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Where each tool shines

Choose JustELI5 if:

• You want one quick simplified explanation and don't care about the exact level
• You want to browse a library of pre-explained topics
• You want the simplest possible interface — paste, click, read

Choose ELI5 AI if:

• You need to explain something to multiple audiences at different levels
• You want to compare simplifications side-by-side to find the right one
• You need shareable links to send a specific simplification to someone
• You care about verified readability scores
• You want your data to stay private (stateless — nothing is stored)
• You want API access for programmatic text simplification

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Privacy and data

JustELI5 saves explanations to a public library. Your simplified explanations may be visible to others. This is a feature if you want to contribute to a knowledge base, but a concern if you're pasting sensitive text (legal documents, medical reports, proprietary research).

ELI5 AI is stateless. Input text is processed in memory and discarded. No database, no logs, no stored results. The only persistent artifact is a shareable link (if you choose to create one), which stores only the simplified output — not your original input.

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Speed and reliability

Both tools are fast — simplification takes a few seconds. ELI5 AI generates four levels in parallel, so the total time is similar to generating one. Neither tool requires an account, so there's no signup friction.

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The bottom line

Both tools are free and good at what they do. The choice comes down to your use case:

• Single explanation, quick and simple → JustELI5
• Multi-level explanations with verified readability → ELI5 AI

If you regularly explain technical concepts to mixed audiences — a product team, a client, a non-technical stakeholder, a family member — the four-level approach from ELI5 AI gives you options that a single-level tool can't match.

Try ELI5 AI: https://eli5.team19.xyz Try JustELI5: https://justeli5.com

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This is an independent comparison by the ELI5 AI team. We've tried to be fair and accurate. If something here is wrong, let us know and we'll fix it.