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Features, pricing and Editor Score side by side — to help you pick the right education & research tool in 2026.
Quick verdict
On our Editor Score, Flexi and NotebookLM land almost level. Pick Flexi if you want photo-based math problem solving; choose NotebookLM for source-grounded chat. On pricing, both ship a free or freemium tier, so you can try each before paying.
| Rating | 4.5 / 5 | 4.4 / 5 |
| Pricing | Free | Free |
| Free tier | ||
| Best for | photo-based math problem solving | source-grounded chat |
AInexfinder Editor Score — our editorial rating from features, value and pricing, blended with verified user reviews where a tool has them.
Free AI math and science tutor from CK-12
Google's AI research and notes tool
Choose Flexi if…
Choose NotebookLM if…
Your use case decides this one: Flexi leans into photo-based math problem solving, while NotebookLM is built for source-grounded chat. Our Editor Score can't separate them (4.5 vs 4.4), so let pricing and feature fit break the tie. Both have a free or freemium tier, so spin up each and keep the one that clicks.
Flexi has the higher AInexfinder Editor Score (our editorial rating from features, value and pricing, blended with verified user reviews where a tool has them), but "better" depends on your needs — compare features, pricing and the pros & cons above to decide.
Flexi (free) is best for photo-based math problem solving, while NotebookLM (free) is best for source-grounded chat. See the full feature and pricing comparison above.
Both have paid plans — pricing depends on your usage tier. Open each tool's review for current prices, and watch for free trials.
Flexi is usually the easier starting point thanks to a lower barrier to entry. Beginners should favour a free tier and a simple interface over raw power.
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Last updated June 2026. Comparisons are ranked by our Editor Score (features, value and pricing, blended with verified user reviews where a tool has them) — see our methodology.