kitio.aiPi vs Onsen
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Pi is completely free, while Onsen is freemium.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Empathetic conversation style
- Spoken replies
- Multiple voices
- Conversation history
- Mobile apps
- AI chat companion
- AI journal
- Guided experiences
- Mood tracking
- Voice input and read aloud
| Feature | Pi | Onsen |
|---|---|---|
| Best for | Inflection's friendly, conversational assistant for talking things through | AI companion app for journaling and emotional support |
| Category | Chat assistants | Chat assistants |
| Pricing model | Free | Freemium |
| Starting price | Free | See pricing page |
| Free plan | Yes, fully free | Yes |
| Made by | Inflection AI | Onsen |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Pi is completely free, while Onsen is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
1 plan
Free
Free
- AI chat and journaling
- Guided experiences
- Mood tracking
- 30-day AI memory
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Pi
- Pleasant, supportive tone
- Good voice experience
- Free with no subscription
- Weak for research or coding
- Slower development than rivals
- Not a replacement for therapy
Onsen
- Free to download
- Voice input and read-aloud
- Journal built from your chats
- Not a substitute for therapy
- Free plan memory limited to 30 days
- Premium pricing not yet published
Which one should you choose?
Choose Pi if you want:
- Pleasant, supportive tone
- Good voice experience
- Free with no subscription
Watch out: weak for research or coding.
Choose Onsen if you want:
- Free to download
- Voice input and read-aloud
- Journal built from your chats
Watch out: not a substitute for therapy.
Pi vs Onsen FAQ
What is the difference between Pi and Onsen?
Pi: Inflection's friendly, conversational assistant for talking things through. Onsen: AI companion app for journaling and emotional support. Both are chat assistants tools.
Is Pi or Onsen cheaper?
Pi is completely free, while Onsen is freemium.
Do Pi and Onsen have free plans?
Pi: Yes, fully free. Onsen: Yes.
Who makes Pi?
Pi is made by Inflection AI, based in United States.
Who makes Onsen?
Onsen is made by Onsen.
Which should I choose, Pi or Onsen?
Choose Pi if you value pleasant, supportive tone and good voice experience. Choose Onsen if you value free to download and voice input and read-aloud.