Built for AI power users
One workspace. Every AI. Your data stays yours.
Compare ChatGPT, Claude, Gemini, and Grok side by side. Synthesize the best answer. Own everything.
Scattered across tabs
ChatGPT here, Claude there, Gemini in another window — context lost every time you switch.
Rate limited and tracked
Hit caps mid-workflow. Your prompts train someone else's model. Privacy is an afterthought.
No way to organize your best work
Great answers disappear in endless threads. Nothing compounds into a knowledge base.
How LettiB works
Three steps to a smarter AI workflow.
Connect your AI keys
Add OpenAI, Anthropic, Google, Groq, and xAI keys once. Encrypted at rest — you pay providers directly.
Compare answers side by side
Send one prompt to up to 6 models in parallel. Watch every response stream live.
Synthesize the best answer
Merge the strongest ideas into one authoritative answer — saved to your project forever.
Ask once. See every answer.
Run the same prompt across ChatGPT, Claude, Gemini, and Grok simultaneously. Grade, follow up, and iterate in one workspace.
One final answer, built from the best of all models.
Don't pick a winner — combine them. Synthesis merges attributed insights into a single polished response you own.
Your AI work, organized.
Group chats, compares, and syntheses by project. Search everything. Build a library that grows with you.
Every project remembers what matters.
Goals, decisions, preferences, and facts accumulate automatically — so every new prompt starts smarter.
Your keys. Your data. Your rules.
LettiB never trains on your conversations. Your API keys are encrypted and never shared. You own everything you create — export, delete, or leave anytime.
Simple, transparent pricing
Free forever with BYOK. Upgrade when you need more models and projects.
Free
- BYOK — unlimited providers
- Compare up to 2 models at once
- 5 projects
- Synthesis (10 / month)
- 7-day history
Pro Monthly
- Everything in Free
- Compare up to 4 models at once
- Unlimited projects
- Unlimited Synthesis
- Project Memory
- Unlimited history & search
Power Monthly
- Everything in Pro
- Compare up to 6 models at once
- Custom AI Teams
- Shareable synthesis links
- Priority synthesis queue
- Priority support
Lifetime BYOK
- Everything in Power
- Single payment — no renewals
- BYOK — unlimited providers
- Best for long-term solo power users
All paid plans are BYOK — you pay AI providers directly. LettiB charges only for the workspace ($15/mo Pro, $35/mo Power, $79 lifetime).
FAQ
What is BYOK?+
Bring Your Own Keys. You connect your provider API keys; LettiB orchestrates the workspace. You pay OpenAI, Anthropic, Google, and others directly — zero usage markup.
Which AI providers are supported?+
OpenAI (GPT-5.x), Anthropic (Claude Sonnet & Opus), Google (Gemini), Groq, and xAI (Grok). Custom OpenAI-compatible endpoints work too.
Is my data private?+
Yes. Your keys are encrypted in Supabase Vault. We never train on your conversations. You own everything you create.
Can I cancel anytime?+
Pro and Power are month-to-month — cancel from the billing portal anytime. Lifetime BYOK is a one-time purchase with no renewals.
What is LettiB Synthesis?+
After comparing multiple models, Synthesis merges the best parts into one final answer with source attribution — like having an editor for your AI outputs.