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Heyday AI

by Heyday (shut down 2025)

System Card

OrganizationHeyday (shut down 2025)
Released2021-06
Architecturevector-rag / Browser-extension passive memory resurface
DetailsHeyday was a browser extension that silently saved every page visited, then automatically resurfaced relevant saved content alongside active Google and web searches. It built a personal knowledge graph from browsing history without requiring manual saves. The product raised $6.5M seed from Spark Capital in June 2022 but shut down in 2025 due to monetization challenges and competition.
Parameters—
Domainrag-retrievalpersonalizationlifelong-learning
Open SourceNo
WebsiteVisit
browser-extensionpassive-capturesecond-brainweb-memorydefunct

Capability Profile

Benchmark Scores

6 of 14 benchmarks
Data Transparency:6 estimated
Long-Context Retrieval
0/5
RULER
no data
NIAH
no data
LooGLE
no data
LongBench
no data
∞Bench
no data
Multi-Turn Recall
2/2
LoCoMo
54.92pEstimated
MemoryBank
61.89pEstimated
Cross-Session Memory
1/1
LongMemEval
59.210pEstimated
Multi-Hop QA
2/3
BABILong
58.70pEstimated
MultiHop-RAG
no data
HotpotQA
67.235pEstimated
Agent Task Memory
0/1
AgentBench-Mem
no data
Personalization
1/1
PerLTQA
62.90pEstimated
Factuality / Grounding
0/1
RAGAS
no data
Sources:Arena estimate — derived from capability profile, not independently verified