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Engineering signal comparison · ai-ml · independent
Side-by-side view of AI21 Labs and Mastra on publicly observable engineering-signal axes. Both orgs are tracked in the ai ml sector. This page is independent — neither company is affiliated with VC Deal Flow Signal, and no private data is published here.
A quantitative view of AI21 Labs's public engineering activity — what we track and why investors watch it.
A quantitative view of Mastra's public engineering activity — what we track and why investors watch it.
| Axis | AI21 Labs | Mastra |
|---|---|---|
| Sector | ai-ml | ai-ml |
| Stage | series c | seed |
| GitHub org | AI21Labs | mastra-ai |
| Homepage | https://www.ai21.com | https://mastra.ai |
| Public momentum | steady | accelerating |
| Public repos | 20+ public repos | 10+ public repos |
| Language bias | Python / TypeScript | TypeScript |
Every axis above is derivable from each company's publicly self-published facts (homepage, GitHub org, careers page) or aggregated public GitHub events. We do not publish private contact data, leaked employee info, or anything that requires authenticated access. For deeper per-company signals, see /signal/ai21-labs and /signal/mastra.
AI21 Labs (series c) shows steady momentum across 20+ public repos on a Python / TypeScript stack. Mastra (seed) shows accelerating momentum across 10+ public repos on a TypeScript stack. The contributor-influx and commit-velocity panels are the comparison surfaces most often used by investors and operators when sourcing in this sector.
No. This is an independent side-by-side using only publicly observable GitHub-event aggregates and each company's self-published facts (homepage, GitHub org, stage). Neither company has endorsed, paid for, or reviewed this page. Corrections welcome via /corrections.
Public GitHub events only — commits, pull requests, issues, releases, contributors. Aggregated weekly across both AI21Labs and mastra-ai. The methodology is published at /methodology and the underlying paper is at SSRN 6606558. Raw aggregates ship via the public MCP server at /api/v1.
Three workflows. (1) Acquisition shortlists: when both orgs are in the same sector and stage, the comparison surfaces the engineering-organization shape that informs integration cost. (2) Vendor consolidation: tech VPs running ai ml consolidation projects use side-by-side eng signals as one input. (3) Competitive scans: emerging-manager funds use these pages to benchmark their own portfolio companies against the closest public reference.
Track AI21 Labs, Mastra, and adjacent ai ml orgs in one weekly digest.
See First Look