# Upgrade DeepTutor

| Plan features | Free<br>$0/month<br>Current Plan | Pro<br>Best Deal<br>$9.99/month<br>[Purchase](/content/dzSubscription/index.html) | Premium<br>$14.99/month<br>[Purchase](/content/dzSubscription/index.html) |
| --- | --- | --- | --- |
| Files | 1 / session | Up to 10 / session | Up to 20 / session |
| Files size limit | Up to 10 MB / file | Up to 50 MB / file | Unlimited |
| Default mode | 5 sessions / week | 50 sessions / month | Unlimited |
| Deep think modeDeeper insights with visual & formula |  | 20 sessions / month | Unlimited |
| Auto-contextAuto-select contexts from entire librarywith DeepTutor server |  |  |  |
| Auto-contextwith your own API key |  |  |  |
| Full PDF TranslationNEW | 1 file (one-time) | Unlimited | Unlimited |

🎁 Earn free months of DeepTutor Pro

Invite a friend from the Desktop app (Settings → Referral Program). When they sign in on Desktop and subscribe using your code, you both get 1 free month. You can stack up to 12 free months per year.

Don’t see the referral tab? Update to the latest Desktop version from the Download page.