Our take
Ambi is a strong option for parcel carriers and fulfillment centers that need robots to sort and stack mixed packages. Its AmbiSort and AmbiStack systems run on AmbiOS, software trained in simulation from UC Berkeley research, and the company says it has processed more than 150 million packages over 250,000 production hours.2,4
Demand looks solid. Ambi said AmbiStack sold out for 2025 within months of launch, with Fortune 500 shipping and logistics customers waitlisted into 2026, and in 2026 it began licensing its robot skills to other makers' robots. It does not publish prices, which keeps its pricing score low.3,4
Scores by criterion
Each criterion is defined on our methodology page.
Who uses Ambi and what it's for
Ambi's buyers are parcel carriers, mail and logistics providers, and large retailers. Its first commercial system began as a pilot with Pitney Bowes, which later expanded the deployment by $23 million, and it has partnered with OSM Worldwide.2
AmbiSort fits operations that sort small parcels, flats, and polybags into sacks or containers. AmbiStack fits loading docks that stack boxes onto pallets or into containers.4,3
AmbiSort, AmbiStack, and AmbiOS
AmbiSort A-Series arms sort parcels into mail sacks, while the B-Series handles middle-mile sortation from bulk bins into large containers or onto conveyors. AmbiStack uses multipick and Sim2Real learning to stack mixed boxes densely, and AmbiKit builds custom bundles from bulk stores.4,3
In 2024 Ambi passed 100 million packages sorted and developed PRIME-1, which it calls the first AI foundation model for warehouse robots.2
Licensing robot skills
In February 2026 Ambi introduced an AI Skill Suite that lets third-party warehouse robots license its skills for item inspection, picking, and placement. Chief Technology Officer Jeff Mahler called adaptation in real-world settings one of the hardest problems in robotics.4
Funding
Ambi came out of stealth with a $26 million Series A and later raised $32 million more, alongside the expanded Pitney Bowes deployment.2
Competitive landscape
| Company | Product | Pricing model | Deployment footprint | Where Ambi wins or loses |
|---|---|---|---|---|
| Ambi Robotics | AmbiSort parcel sorting and AmbiStack stacking robots1 | Not published1 | Fortune 500 shipping and logistics customers; AmbiStack sold out for 20253 | Strong at sorting and stacking mixed parcels; pricing not published |
| Plus One Robotics | InductOne, DepalOne, and vision software with remote human help7 | DepalOne from $155,000; other systems by quote7 | More than 1.5 billion picks in 15 countries7 | Ambi wins on sorting to last-mile sacks. Plus One wins on a longer record of induction to existing sorters and a published starting price. |
| Dexterity | AI-driven robots for truck loading and parcel handling10 | Not published10 | Robots run full shifts at large logistics companies; model trained on over 100 million production actions10 | Ambi wins on parcel sorting and stacking. Dexterity wins on truck loading. |
| Pickle Robot | Robot that unloads trailers and containers of loose goods11 | Not published11 | UPS is a named user; unloads a trailer in as little as 90 minutes11 | Ambi wins downstream at sorting and stacking. Pickle wins at unloading trailers. |
| Boston Dynamics | General-purpose legged robot with inspection payloads14 | Launched at $74,500 for US businesses in 2020; current price by quote12,14 | Sold to businesses across industries14 | Ambi wins on purpose-built parcel sorting. Boston Dynamics wins on a general-purpose robot. |
Limits
No public pricing for systems or software.3
Customer concentration is a risk. Its best-documented deployment is with Pitney Bowes.2
Revenue is not disclosed. We estimate it at $10 million to $20 million, based on Growjo's modeled $13.6 million with 49 employees and the sold-out 2025 AmbiStack run. This is an estimate, not a reported figure.6,3
What customers say
Where it helps
Ambi Robotics is a customer-centered company, and we feel that as a customer.
Where it falls short
We found no independent negative reviews of Ambi. The open questions are how fast it can scale production for waitlisted customers and how much revenue the new licensing model adds.3,4
Leadership
Jim Liefer
Chief executive officerLiefer was CEO of Kindred AI, which Ocado Group acquired, and earlier COO of One Kings Lane and an executive at Walmart.com and UPS.5
Jeff Mahler
Co-founder and chief technology officerMahler earned his PhD at UC Berkeley's AUTOLAB, where his research focused on Dex-Net, and previously served as Ambi's CEO.5
Stephen McKinley
Co-founder and chief operating officerMcKinley holds a doctorate in mechatronics design from UC Berkeley and leads fleet deployments.5
Sources
- Ambi Robotics, Homepage, accessed November 1, 2026
- Ambi Robotics, About, accessed November 1, 2026
- Ambi Robotics, Ambi Robotics sells out AmbiStack for 2025, accessed November 1, 2026
- Ambi Robotics, Ambi Robotics advances physical AI by licensing its hard-earned robot skills, accessed November 1, 2026
- Ambi Robotics, Leadership bios, accessed November 1, 2026
- Growjo, Ambi Robotics revenue and employee estimates, accessed November 1, 2026
- Plus One Robotics, Home page, accessed November 1, 2026
- TechCrunch, Plus One raises $50M for its parcel robotics vision systems, March 7, 2023, accessed October 31, 2026
- Plus One Robotics, About, accessed November 1, 2026
- Dexterity, Home page, accessed November 1, 2026
- Pickle Robot, Home page, accessed November 1, 2026
- TechCrunch, Now any US business can buy Boston Dynamics' Spot robot for $74,500, June 16, 2020, accessed November 1, 2026
- Boston Dynamics, Stretch, accessed November 1, 2026
- Boston Dynamics, Spot, accessed November 1, 2026
