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Sends one prompt to several AI models at once and merges the replies into a single synthesized answer.
LettiB sends a single prompt to multiple AI models at once — OpenAI, Anthropic Claude, Google Gemini, Groq, DeepSeek, and xAI Grok are supported, along with custom OpenAI-compatible endpoints — and shows the responses side by side before merging them into one synthesized answer. It targets people who already jump between several AI chat apps to cross-check answers and would rather see that comparison automatically. The free plan includes 300 monthly credits; Pro at $15 a month raises that to 15,000 credits and unlocks unlimited synthesis, while Power at $35 a month allows querying up to six models at once. A one-time $79 Lifetime plan uses the user's own API keys instead of a subscription.
Pro is 15/month for 15,000 credits and unlimited synthesis; a one-time 79 Lifetime BYOK plan skips the subscription in exchange for a personal API key.
Use tool ↗LettiB's actual differentiator is the synthesis step — merging several models' answers into one, rather than just showing them side by side like most multi-model chat tools. The free tier's 300 credits disappear quickly if synthesis is used often, and it is a web-only tool with no native app.
Watch out: Synthesis is what gets capped hardest by the free plan — most of the 300 monthly credits go quickly once synthesis is used instead of single-model chat.
Side-by-side fact sheets against the competitors our research names — pricing, platforms, API and both verdicts on one page.
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