kitio.aiZ.ai vs Lighten.im
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Z.ai starts at Free and Lighten.im starts at Free. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- GLM model choice
- Thinking mode
- Web search
- Slide and web page generation
- File uploads
- Anonymous venting
- AI replies in about 30 seconds
- Conversation starter prompts
- Audio playback of replies
- Crisis support links
| Feature | Z.ai | Lighten.im |
|---|---|---|
| Best for | Free chatbot running Zhipu's GLM models for chat, code and slides | Free, anonymous AI replies for young people who need to vent |
| Category | Chat assistants | Chat assistants |
| Pricing model | Free | Free |
| Starting price | Free | Free |
| Free plan | Yes, fully free | Yes, fully free |
| Made by | Z.ai (formerly Zhipu AI) | Lighten.im |
| Based in | China | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Z.ai starts at Free and Lighten.im starts at Free. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
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
Z.ai
- Free access to a frontier-class model
- Good at building small web apps
- Open-weight models behind it
- Less known outside developer circles
- Data handled by a Chinese company
- Fewer integrations than big rivals
Lighten.im
- No account or personal details needed
- Completely free
- Links to crisis resources
- Not a replacement for therapy
- One-off replies rather than ongoing chat
- Messages capped at 1,800 characters
Which one should you choose?
Choose Z.ai if you want:
- Free access to a frontier-class model
- Good at building small web apps
- Open-weight models behind it
Watch out: less known outside developer circles.
Choose Lighten.im if you want:
- No account or personal details needed
- Completely free
- Links to crisis resources
Watch out: not a replacement for therapy.
Z.ai vs Lighten.im FAQ
What is the difference between Z.ai and Lighten.im?
Z.ai: Free chatbot running Zhipu's GLM models for chat, code and slides. Lighten.im: Free, anonymous AI replies for young people who need to vent. Both are chat assistants tools.
Is Z.ai or Lighten.im cheaper?
Z.ai starts at Free and Lighten.im starts at Free. Check both pricing pages for current plans.
Do Z.ai and Lighten.im have free plans?
Z.ai: Yes, fully free. Lighten.im: Yes, fully free.
Who makes Z.ai?
Z.ai is made by Z.ai (formerly Zhipu AI), based in China.
Who makes Lighten.im?
Lighten.im is made by Lighten.im.
Which should I choose, Z.ai or Lighten.im?
Choose Z.ai if you value free access to a frontier-class model and good at building small web apps. Choose Lighten.im if you value no account or personal details needed and completely free.