Haystack vs LangGraph
TL;DR
How Haystack and LangGraph compare on real-world demand, licensing, adoption and positioning — straight from the Agent Reality Index.
| Dimension | Haystack | LangGraph |
|---|---|---|
| Agent Reality Index | 63.0 / 100 (#4) | 65.5 / 100 (#2) |
| Monthly search demand | ~17k/mo | ~33k/mo |
| Licensing | Open-source | Open-source |
| Developer adoption | 26k★ on GitHub | 44k★ on GitHub |
| Positioning | Low-level / composable · Single-agent | Low-level / composable · Single-agent |
The verdict
Haystack and LangGraph are neck-and-neck on the Agent Reality Index (63.0 vs 65.5). The gap is small enough that the right pick comes down to fit rather than popularity: Haystack is open-source, while LangGraph is open-source. Use the positioning row above to choose by how you actually want to work.
Figures auto-generated from the Agent Reality Index and refreshed monthly. How the index is built →