Haystack
- Organizer
- OpenSource Connections
- Category
- Database
- Website
- haystackconf.com
- Social
- X / Twitter · LinkedIn · Mastodon · YouTube
- Typical place
- Charlottesville, United States
- Topics
- Generative AIMachine learning
The search relevance (now 'search & AI') conference created and run by OpenSource Connections (OSC) since 2018. Haystack US is held each April/May in Charlottesville, VA (OSC's home), mostly at the Violet Crown cinema; Haystack Europe was in London (2018), at ExRotaprint in Berlin (2019) and at the TUECHTIG co-working space in Berlin since 2022, with event support from Plain Schwarz. Editions use id_suffix 'us' / 'eu'. 2020 US was cancelled for COVID-19 (talks moved into the joint online event with Berlin Buzzwords and MICES); 2021 was a single hybrid day in Charlottesville. Hybrid (Zoom) since 2023 US. Not recorded: the half-day 'Haystack On Tour' events (Krakow Feb 2023, Barcelona May 2023, Austin Nov 2023) and the online 'Haystack LIVE' meetups. Talks, slides and videos are archived at archive.haystackconf.com. Social accounts (X, Mastodon, YouTube) are OSC's; LinkedIn is the conference's own showcase page. Not to be confused with deepset's Haystack LLM framework.
Activity by year
Sponsor companies per year
Distinct companies sponsoring any event that year, counted once across events.
- Complete list
- Partial or unverified list
- No sponsor list
6 of 8 years have a partial, unverified or missing sponsor list, so their bars undercount.
Speakers per year
Distinct people on stage at any event that year; same year axis as sponsors.
Events
| Dates | Event | Place | Format / status | Attendance | Sponsors | Speakers |
|---|---|---|---|---|---|---|
| Sep 15–16, 2026 | Haystack Europe 2026 | Berlin, Germany | — | 3 | 19 | |
| May 6–7, 2026 | Haystack US 2026 | Charlottesville, United States | — | 2 | 16 | |
| Sep 23–24, 2025 | Haystack EU 2025 | Berlin, Germany | — | 2 | 20 | |
| Apr 23–24, 2025 | Haystack US 2025 | Charlottesville, United States | — | — | 24 | |
| Sep 30, 2024 – Oct 1, 2024 | Haystack EU 2024 | Berlin, Germany | — | — | 20 | |
| Apr 23–24, 2024 | Haystack US 2024 | Charlottesville, United States | — | 3 | 26 | |
| Sep 20–21, 2023 | Haystack EU 2023 | Berlin, Germany | — | — | 25 | |
| Apr 25–26, 2023 | Haystack US 2023 | Charlottesville, United States | — | 4 | 24 | |
| Sep 27, 2022 | Haystack EU 2022 | Berlin, Germany | — | — | 10 | |
| Apr 27–28, 2022 | Haystack US 2022 | Charlottesville, United States | — | — | 24 | |
| Sep 29, 2021 | Haystack US 2021 | Charlottesville, United States | — | — | 10 | |
| Apr 29–30, 2020 | Haystack US 2020 | Charlottesville, United States | Cancelled | — | 1 | — |
| Oct 28, 2019 | Haystack Europe 2019 | Berlin, Germany | — | 3 | 11 | |
| Apr 24–25, 2019 | Haystack 2019 | Charlottesville, United States | — | — | 26 |
Attendance over time
No attendance figures recorded
Most frequent speaker companies
Speaker appearances across all events, by the speaker's company.
Similar conferences
Conferences with the most similar speaker mix: their speakers come from the same companies. Bars are cosine similarity on a 0–1 scale; between conferences even the closest pairs share only part of their crowd.
- Berlin Buzzwords0.28
- Data Council0.07
- AI Engineer0.06
- MongoDB.local0.05
- Airflow Summit0.05
Sponsors over the years
Top 13 of 13 sponsoring companies, ranked by years sponsored. Each cell shows the highest tier that year; hover for the events.
- Media
- Other / unspecified