Research
Research citation packages
Each research report comes with a dataset, methodology, snapshot and citation formats. Reproducible from closed Harpd Rank snapshots.
Research families
AI tools index
Monthly AI tools index from Harpd Rank data: top AI products, rank movement, category breakdown and new entrants, from closed monthly leaderboard snapshots.
View family →AI tools trends
Monthly AI tools trend report: which AI products climbed or fell on Harpd Rank, which categories gained share and which new products entered — from closed monthly snapshots.
View family →Developer tools index
Monthly developer tools index from Harpd Rank: APIs, dev infrastructure and engineering productivity products ranked in the closed monthly snapshot, with movement and new entrants.
View family →AI agent index
Monthly AI agent index from Harpd Rank: autonomous agent platforms and tool-using assistants ranked in the closed monthly snapshot, with movement and new entrants.
View family →AI market index
Monthly Harpd AI Market Index: the whole Harpd Rank board in one report — total products, Rank Points by category, market share, movers and new entrants from the closed monthly snapshot.
View family →Published reports
AI tools index
AI tools trends
Developer tools index
AI agent index
AI market index
How to cite a research report
- Use the report URL, the covered month and the family name
- Link the dataset so a third party can recompute the figure
- Include the methodology link
- State the license: CC BY 4.0
Harpd. "AI tools index — 2026-09". https://harpd.com/research/ai-tools-index/2026/09/ (CC BY 4.0).
Dataset: https://harpd.com/data/rank-history.json
Methodology: https://harpd.com/rank/methodology/