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Simile vs Aaru
Simile and Aaru both sell enterprise behavior simulation. Simile publishes weekly human-evaluation volume and a $200 million Series B. Aaru publishes a 0.90 median Spearman correlation on a blinded EY wealth-study recreation. Neither publishes a pooled MAE against public polls, and neither publishes pricing. This page is a rubric, not a ranking.
Read their sites, not a scorecard adjective
Simile (simile.ai) says every population starts with real people, that it runs over 7,000 weekly evaluations across subpopulations and enterprise use cases, and that an AI confidence model tags each result. It lists quoted partners including CVS Health, Wealthfront, and Gallup. Founders' academic work (Stanford CRFM, generative agents, the 1,000-person simulation paper) is on the same homepage.
Aaru (aaru.com and aaru.com/simulation) says it builds simulated populations from public and licensed records and tests product, price, message, and strategy decisions. The EY recreation is the accuracy number it puts on the public site. It also describes a Breakwater capital-markets tracker of 71 judgments across 40,000 simulated investors (July 17, 2026).
Worked comparison: two published numbers that do not convert
7,000 weekly evaluations is a volume claim. 0.90 Spearman on one blinded wealth study is a scoped correlation. You cannot subtract them. A procurement packet should attach the original pages and ask each vendor for the instrument, the n, the holdout rule, and whether the number is production or a single engagement. If you also need option-share error against Pew or Gallup, that figure is not on either site. Lewsearch publishes it (7.47% on 404 questions) at /methodology.
| Rubric | Simile | Aaru | Lewsearch (for the empty cell) |
|---|---|---|---|
| Published accuracy unit | Weekly eval volume; confidence tags | Spearman 0.90 on EY wealth study | MAE 7.47% |
| Pooled public-poll MAE | Does not publish | Does not publish | 7.47% |
| Named n | 7,000+ weekly evaluations | 3,600 investors; 40,000 in Breakwater tracker | 460 scored questions |
| Public pricing | Does not publish | Does not publish | Published on /pricing |
| Public access | Request a demo | See how it works / enterprise | Self-serve plus demo |
| On-site company fact | $200M Series B at $2B (Jul 30, 2026) | EY and Breakwater named | Columbus, OH |
Sources
FAQ
- Does either Simile or Aaru publish a pooled MAE?
- As of August 2026, neither homepage publishes a pooled mean absolute error against a named public-poll set with a scored-question count. Simile publishes weekly evaluation volume. Aaru publishes a Spearman correlation on one EY study.
- What is Simile's headline company fact?
- Its homepage announces a $200 million Series B at a $2 billion valuation, dated July 30, 2026.
- What is Aaru's headline accuracy fact?
- Aaru states that a blinded recreation of EY's 2025 Global Wealth Study reached a median Spearman correlation of 0.90 (3,600 affluent investors, more than 30 markets, one day).
- Who publishes public-poll MAE in this category?
- Lewsearch does: 7.47% on 404 ex-electoral questions of a 460-question set. That is listed here only because it is the cell both other vendors leave blank.
Check the work
Related
Canonical: https://lewsearch.com/compare/simile-vs-aaru