kitio.aiRespondable vs Letterbot
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Respondable starts at See pricing page and Letterbot starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Reply likelihood prediction
- Tone and politeness feedback
- Real-time writing advice
- Built into Boomerang for Gmail
- Notes to email
- Reply generation
- Thread summaries
- Grammar fix
- 9 tones and 13 languages
| Feature | Respondable | Letterbot |
|---|---|---|
| Best for | Real-time email coach in Gmail that predicts reply chances | Gmail add-on that turns rough notes into finished emails |
| Category | Writing | Writing |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | Yes |
| Made by | Baydin | Letterbot |
| Based in | United States | Germany |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Respondable starts at See pricing page and Letterbot starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- 5 requests a day
- Write, reply, subject and summary
Basic
€3.99/mo
- 100 requests a day
- All 6 writing tools
- Grammar fix and sales writer
Professional
€19.99/mo
- 800 requests a day
- Priority AI processing
Prices in USD, checked Nov 5, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Respondable
- Feedback while you type
- Explains why a score changed
- Comes with Boomerang's other Gmail tools
- Works only with Gmail
- Gives advice rather than rewriting text
- Requires installing the Boomerang extension
Letterbot
- Works directly inside Gmail
- Very low-cost paid plan
- Only runs when you click a tool
- Free plan allows 5 requests a day
- Prices only listed in euros
- Native integration limited to Gmail
Which one should you choose?
Choose Respondable if you want:
- Feedback while you type
- Explains why a score changed
- Comes with Boomerang's other Gmail tools
Watch out: works only with gmail.
Choose Letterbot if you want:
- Works directly inside Gmail
- Very low-cost paid plan
- Only runs when you click a tool
Watch out: free plan allows 5 requests a day.
Respondable vs Letterbot FAQ
What is the difference between Respondable and Letterbot?
Respondable: Real-time email coach in Gmail that predicts reply chances. Letterbot: Gmail add-on that turns rough notes into finished emails. Both are writing tools.
Is Respondable or Letterbot cheaper?
Respondable starts at See pricing page and Letterbot starts at See pricing page. Check both pricing pages for current plans.
Do Respondable and Letterbot have free plans?
Respondable: Yes. Letterbot: Yes.
Who makes Respondable?
Respondable is made by Baydin, based in United States.
Who makes Letterbot?
Letterbot is made by Letterbot, based in Germany.
Which should I choose, Respondable or Letterbot?
Choose Respondable if you value feedback while you type and explains why a score changed. Choose Letterbot if you value works directly inside gmail and very low-cost paid plan.