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meta/folly

Establishedrank #33

An open-source C++ library developed and used at Facebook.

30.6k+129 · 7d 5.9k 287est. Apache-2.0C++pushed 19m ago
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Composite

69

conf 65%

Momentum

57

conf 60%

Vitality (PVI)

80

conf 67%

Community

61

conf 60%

Security & maint.

90

conf 85%

Ecosystem influence

60

conf 60%

Opportunity

66

conf 60%

Breakout · 7d

51%

conf 71%

Executive summary

folly is currently classified as established with a composite score of 69/100. Momentum (57) and vitality (80) are aligned — growth is backed by sustained maintenance. Estimated 7-day gain of 129 stars against a 30.6k-star base. Risk is assessed as low; the interpretable model puts its probability of entering the top trend cohort within 7 days at 51%.

90-day trajectory

+528 · 30d
2026-08-012026-10-29

Score breakdown

Every input, weight and normalized value — nothing hidden. Inputs marked est. are estimated until the full ingestion pipeline lands.

Momentum

Star velocityest.25%59
Star accelerationest.15%52
Fork velocityest.10%48
Contributor growthest.10%94
Issue activity growthest.10%71
PR activity growthest.10%58
External mention velocityest.10%4
Release event impactest.5%76
Trending-rank persistenceest.5%63

Model tn-interpretable-1.0.0 · confidence 60% · coverage 100%

Project Vitality Index

Commit consistency20%100
Release cadenceest.15%78
PR responsivenessest.15%83
Issue responsivenessest.15%51
Contributor diversityest.10%91
Maintainer continuityest.10%85
Documentation qualityest.5%75
Dependency freshnessest.5%61
Security hygieneest.5%78

Model tn-interpretable-1.0.0 · confidence 67% · coverage 100%

Security & maintenance

Release recency25%100
License clarity20%92
Maintenance status25%100
Dependency stalenessest.15%69
Bus factorest.15%76

Model tn-interpretable-1.0.0 · confidence 85% · coverage 100%

Ecosystem influence

Dependent repositoriesest.30%91
Quality-weighted dependentsest.20%73
Documentation citationsest.15%46
Contributor overlapest.15%40
Registry adoptionest.10%46
Topic centralityest.10%9

Model tn-interpretable-1.0.0 · confidence 60% · coverage 92% · missing: packageRegistryAdoption