Labelbox review: from labeling software to a full training data company
Answer in brief: Labelbox began as annotation software and now sells three things. Horizon offers RL environments and evals for post-training, including WorldSim, which builds simulated companies for models to work in. Terra supplies robotics data. Alignerr is its expert network. It also sells Recursion managed agents to enterprises. On October 14, 2026 it announced a $100M+ Series E at a $1.25B pre-money valuation and said it is profitable. This is independent research; we did not test Labelbox hands-on.
Top pick for: teams that want platform tooling and managed expert data from one vendor, and labs buying RL environments. Visit Labelbox →
Where Labelbox sits in the directory
Category: human data and expert post-training, plus annotation tooling and robotics data.
What it does for AI training data
- Horizon: RL environments and evals across reasoning, tool use and computer use. WorldSim fills simulated companies with code, dashboards, spreadsheets and documents.
- Terra: robotics data from pre-training to evals, including egocentric and teleoperated demonstrations.
- Alignerr: 2.6M+ skill-tested experts across 200+ domains who write rubrics, preferences and demonstrations.
- Platform: software that turns expert judgment into training data. Labelbox says many leading tech companies run enterprise-wide post-training programs on it.
Who it fits
Frontier labs and hyperscalers buying environments, and enterprises that want to run post-training programs on their own tooling.
Why buyers pick Labelbox
- Widely used by frontier labs. Labelbox says it works with 90%+ of leading U.S. AI labs and has 400+ customers.
- Profitable growth. It says it became profitable in 2026 while growing more than 5x year over year.
- Owns its whole stack. It runs its own agent harness, sandboxes running millions of VMs, RL post-training infrastructure and an expert network of 4M+ people.
- Named customer stories: Meta (the GIM benchmark), Google Cloud (LLM evaluation in Vertex AI) and Intuitive Surgical.
Honest drawbacks
- Recursion managed agents now share its attention, so its focus is split.
- Expert-network figures differ between pages: 2.6M+ for Alignerr versus 4M+ in the Series E post.
- The Series E mixes equity and a credit facility, and the split was not disclosed.
Pricing
Custom, through sales.
Best alternatives to Labelbox
- Scale AI: the broadest range of data types.
- micro1: Realm environments and expert data.
- iMerit: Ango Hub tooling plus an in-house workforce.
Labelbox FAQ
What is Alignerr?
Labelbox's expert network: 2.6M+ skill-tested experts across 200+ domains, according to Labelbox.
How much did Labelbox raise in 2026?
More than $100M in Series E financing, including equity and a credit facility, at a $1.25B pre-money valuation, led by Infinitum Partners.
Does Labelbox provide robotics data?
Yes, through Terra, which includes egocentric and teleoperated demonstrations.