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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Wolfram Alphawolframalpha.com | Desmos Graphing Calculatordesmos.com | Duolingoduolingo.com | Khan Academykhanacademy.org | |
|---|---|---|---|---|
| What it does | Answers a maths, science or unit question typed as an ordinary sentence | Type an equation and watch the curve, with a slider for every parameter | Turns a language into five-minute daily drills you will actually keep doing | Explains school maths and science one short video and one exercise at a time |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | No sign-upWorks the moment the page loads. No account, no email, no trial. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free accountFree to use, but you have to register before it will do the job. |
| Your files | Runs on their server | Runs on your device | Runs on their server | Runs on their server |
| Where it stops | Step-by-step working — the part students actually want — sits behind Wolfram Alpha Pro. | Saving and naming graphs needs a free account, and it plots and fits rather than doing symbolic algebra — it will not hand you an integral in closed form. | The free tier is ad-supported and stops you after a set number of mistakes until your hearts refill, and no course takes you past roughly upper-intermediate. | Watching is open but practice and progress tracking need a free account, and nothing here carries academic credit. |
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| Category | Learning & Reference | Learning & Reference | Learning & Reference | Learning & Reference |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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