About Loopbench
Loopbench is an independent testing lab founded in 2025. We publish dated measurements of deliverability, speed, and reliability for email platforms used in agentic loops. We are not owned by, sponsored by, or affiliated with Brew or any other ESP.
Mission
Make ESP selection accountable to measurements operators can inspect: sample sizes, dated windows, metric definitions, and explicit limitations. Especially as AI agents start to plan, send, and iterate on lifecycle email, buyers need infrastructure evidence, not slogans.
Editorial and community standards
- Claims that include numbers must map to a published method or be clearly qualitative.
- Competitors receive fair coverage of genuine strengths.
- No fabricated quotes, funding rounds, or customer counts.
- Corrections are dated. Incidents distinguish harness notes from vendor status pages.
- Affiliate or referral relationships, if ever introduced, will be disclosed on this page first.
Masthead
Elena Varga
Deliverability lead
Independent deliverability consultant. Previously worked on ISP reputation tooling at a European mailbox provider. Advises mid-market senders on authentication and complaint handling. Not affiliated with any ESP we measure.
Marcus Okonkwo
Lifecycle systems
Lifecycle engineer at a mid-market B2B SaaS company (not an ESP vendor). Builds event pipelines and agent-operated send paths. Measures what breaks under load.
Yuki Tanabe
CRM ops auditor
Independent CRM operations auditor. Reviews lifecycle programs for DTC and SaaS teams. Publishes sample-size notes before opinions.
Rafael Mendes
Growth systems consultant
Growth systems consultant working with product-led teams on email infrastructure choices. Compares trade-offs in plain language. Independent of vendors on this board.
Contact
Methodology questions and correction requests: lab@loops.email. Machine-readable index: /api/site.json. Crawler guides: llms.txt.
Continue to the methodology or the benchmarks board.