Pricing
Start free. Upgrade when you're ready.
Credits from ₦100 · Subscriptions from ₦2,500/month · Cancel anytime
Free
Always free
Get a feel for Stella with no commitment.
- 200 sign-up credits
- 2 PDF uploads/week
- 20 PDF chat messages/week
- 20 Stella chat messages/week
- 1 exam/week
- 3 personas (Einstein, Achebe, Feynman + more)
- 5 knowledge cards/day
- File conversion (all types)
- Lecture recording (browser STT)
- Deepgram STT (Nigerian accent)
- Story mode
- Podcast mode
Lite
₦2,500/month
For students who process 1-2 lectures a week.
- 1 hr lecture/week (Whisper STT)
- 5 PDFs/week (300 pages each)
- 40 PDF chat messages/week
- 40 Stella chat messages/week
- 5 exams/week
- 10 personas (+ Tesla, Nightingale, Sagan...)
- 10 knowledge cards/day
- Story mode
- Podcast mode
- Deepgram primary STT
- ElevenLabs audio
Pro
₦4,500/month
The plan most serious students need.
- 3 hrs lecture/week (Deepgram nova-2)
- 15 PDFs/week (600 pages each)
- Unlimited* PDF chat
- Unlimited* Stella chat
- Unlimited* exams
- All 20+ personas
- 10 knowledge cards/day
- Story mode
- Podcast mode (5/week, browser TTS)
- ElevenLabs audio
- Claude Sonnet LLM
Premium
₦7,000/month
For power users who live in Stella.
- 6 hrs lecture/week (Deepgram priority)
- Unlimited* PDFs (unlimited pages)
- Unlimited* PDF chat
- Unlimited* Stella chat
- Unlimited* exams
- All 50+ personas
- 10 knowledge cards/day
- Story mode
- Podcast mode (10/week + ElevenLabs audio)
- Claude Sonnet LLM (upgraded)
- Priority processing queue
* "Unlimited" features have fair-use caps that no normal student will ever reach. See FAQ below.
Pay as you go
Just need a top-up?
Buy credits separately. No subscription required.
FAQ
Questions answered.
What does 'unlimited' mean?
For practical purposes, unlimited. We apply fair-use caps at the database level (e.g. 500 PDF chats/week) that no normal student will ever reach. If you hit them, you'll see a 'daily limit reached' message.
Can I use credits and a subscription together?
Yes. Subscribers get weekly limits included in their plan. Credits are a separate top-up layer — if you exhaust your weekly allowance, you can continue using credits.
What is Deepgram nova-2?
The highest-accuracy speech-to-text engine for Nigerian English. It dramatically outperforms browser-based STT, especially in lecture environments with background noise.
Does Stella work for Nigerian students?
Stella was built first for Nigeria. The STT is optimized for Nigerian English, the pricing is in ₦, payments are via Paystack, and all examples and personas include African figures like Achebe and Soyinka.
Can I cancel anytime?
Yes. Cancel any time. Your plan stays active until the end of the current billing period. No penalties.
What file formats does Stella support?
For lectures: MP3, MP4, M4A, WAV, WebM. For PDFs: PDF, DOCX, TXT. File conversion supports PDF↔Word↔PowerPoint↔Excel, image formats, and audio/video conversion — all free.
Start with 200 free credits today.
No card required. Cancel anytime.
Create free account