Best Open Source Alternatives to Perplexity

Letta is an open-source platform for stateful AI agents, using tiered virtual memory and PostgreSQL storage to curb recurring token inference costs.

vs Perplexity: a free, open-source option you fully control, licensed Apache-2.0.

SurfSense is an open-source NotebookLM alternative with live web connectors and local LLM support for self-hosted AI research.

vs Perplexity: a free, open-source option you fully control, licensed Apache-2.0.

Scira is an open-source alternative to Perplexity that queries live web sources, cites references inline, and lets developers choose their own AI models.

vs Perplexity: a free, open-source option you fully control, licensed AGPL-3.0.

Open-source AI answer engine replacing Perplexity with generative UI, multi-provider model routing, and self-hosted SearXNG search integration.

vs Perplexity: a free, open-source option you fully control, licensed Apache-2.0.

Fullmoon is an open-source iOS and macOS alternative to ChatGPT, running quantized MLX models fully offline on Apple silicon with zero data telemetry.

vs Perplexity: a free, open-source option you fully control, licensed MIT.