Grason-Stadler
Grason-Stadler is a privately held U.S. medical device manufacturer founded in 1949 that designs, produces, and globally distributes audiometric diagnostic and screening instrumentation—including audiometers, tympanometers, OAE devices, and evoked potentials systems—for clinical audiologists, hospitals, schools, VA clinics, and research facilities through an exclusive worldwide distributor network.
- Company typePrivate
- Founded1949
- HeadquartersEden Prairie, United States
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
What Grason-Stadler does
Grason-Stadler (GSI), founded in 1949 by Rufus Grason and Steven Stadler and headquartered in Eden Prairie, Minnesota, is a privately held medical device manufacturer specializing in audiometric diagnostic and screening instrumentation. The company designs and produces clinical and screening audiometers, tympanometers, otoacoustic emissions (OAE) devices, and evoked potentials systems, together with supporting data management software. Key products include the AudioStar Pro and Pello clinical audiometers, the TympStar Pro middle-ear analyzer, the GSI Corti OAE device, the Audera Pro evoked potentials system, the Novus newborn screener, and the AMTAS automated audiometry platform. Devices are designed as stand-alone units that can also connect to EMR/EHR systems via GSI Suite (Noah-compatible) and the cloud-based GSI Cloud platform. The company operates under ISO 13485 quality systems and complies with sector standards including ANSI S3.6, IEC 60645-1, and IEC 60601-1.
GSI serves hearing healthcare professionals through a horizontal segmentation approach across clinical audiologists (primary segment), hospitals and medical centers, schools and educational institutions, Veterans Affairs clinics, and university research facilities. All international sales are routed through an exclusive worldwide distributor network spanning more than 100 offices across 70+ countries, supported by clinical education content, continuing-education courses, and presence at major industry events (AAA, ASHA, EHDI, JDVAC, AAO-HNSF, HEAL, IFOS). Revenue is generated primarily through hardware sales, with software (AMTAS, GSI Suite, GSI Cloud) licensed either bundled with hardware or separately; pricing is not publicly disclosed and is obtained via a "Request a Quote" system that connects customers with their local distributor. Grason-Stadler is privately held with no disclosed institutional investors, parent company, or funding history.
Grason-Stadler firmographics
Firmographics- Name
- Grason-Stadler
- Legal name
- Grason-Stadler Inc.
- Website
- https://grason-stadler.com
- Company type
- Private
- Founded year
- 1949
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Grason-Stadler is a privately held U.S. medical device manufacturer founded in 1949 that designs, produces, and globally distributes audiometric diagnostic and screening instrumentation—including audiometers, tympanometers, OAE devices, and evoked potentials systems—for clinical audiologists, hospitals, schools, VA clinics, and research facilities through an exclusive worldwide distributor network.
- Ownership category
- akta.pro rank
Grason-Stadler industry classification
Industry- Product category
- Audiometric Diagnostic Equipment
- NAICS
- Electromedical and Electrotherapeutic Apparatus Manufacturing (334510), Surgical and Medical Instrument Manufacturing (339112)
- SIC
- Surgical & Medical Instruments & Apparatus (3841), Electromedical & Electrotherapeutic Apparatus (3845)
- akta.pro primary industry
- Audiology & Hearing Diagnostic Centers (HLAFAKAH)
Keywords
Where Grason-Stadler is headquartered
LocationHeadquarters
- HQ city
- Eden Prairie
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Grason-Stadler business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Audiometric Equipment Sales: Sale of diagnostic and screening audiometric equipment including audiometers, tympanometers, OAE instruments, and evoked potential systems. Products are sold through a global network of exclusive distributors in over 70 countries.
- Software Licenses: Software solutions including GSI AMTAS (Pro and Flex), GSI Suite, and GSI Cloud for automated audiometry and data management. Software is bundled with hardware or sold separately.
Go-to-market motion1 record
Distribution channels2 records
Marketing channels6 records
Grason-Stadler product offering
Product offeringCore offering
Grason-Stadler designs, manufactures, and distributes audiometric assessment instrumentation for hearing healthcare professionals worldwide. Its product portfolio spans the complete audiometric test battery including clinical and screening audiometers, tympanometers, otoacoustic emissions (OAE) devices, and evoked potentials systems, complemented by proprietary software (GSI Suite, GSI AMTAS, GSI Cloud) for automated audiometry and EMR/EHR-compatible data management. Products are sold exclusively through a global network of more than 100 distributor offices across over 70 countries and supported for the product lifecycle with consultation, installation, and calibration services.
Product overview
Grason-Stadler (GSI) offers a comprehensive portfolio of audiometric assessment instrumentation for hearing healthcare professionals. The product line spans multiple device categories: diagnostic audiometers (AudioStar Pro, GSI Pello), screening audiometers (GSI 18), automated audiometry solutions (GSI AMTAS Pro and AMTAS Flex), clinical tympanometers (TympStar Pro), screening tympanometers (Allegro, GSI 39), otoacoustic emissions devices (GSI Corti), evoked potential systems (Audera Pro, GSI Novus), and supporting software (GSI Suite, GSI Cloud). The architecture follows a device-plus-software model where clinical instruments connect to proprietary data management platforms for EMR/EHR integration and cloud-based data storage. Recent innovations include the ACT (Audible Contrast Threshold) speech-in-noise test and automated patient-directed testing through AMTAS.
Differentiator
Problem solved
Functional benefit
Products and services
- AudioStar Pro A clinical two-channel audiometer that replaced the GSI 61, featuring ergonomic design and one-button, one-function navigation for comprehensive manual and automated audiometry testing. Used by clinical audiologists for diagnostic audiometry, hearing aid verification, and speech-in-noise assessment (with ACT/Speech Plus license).
- GSI Pello An adaptable mid-level audiometer that is portable, stand-alone, and PC-enabled, customizable for growing practices. Available with a Speech Plus license enabling the ACT speech-in-noise test. Used by audiologists in private practices and smaller clinics needing flexible audiometry.
- GSI 18 A portable screening audiometer with three stimulus options (steady, pulsed, FM) and two transducer choices (DD45 supra-aural headphones, EAR 3A insert phones). Operates on AC power or battery for up to 10 hours. Used for hearing screening in occupational health, schools, and industrial settings.
- GSI AMTAS Pro Diagnostic automated audiometry software operated through a touch screen computer connected to a compatible GSI audiometer (AudioStar Pro or Pello). Provides air/bone conduction testing with masking and speech SRT/WRS testing with masking. Used by audiologists seeking validated patient-directed automated testing to manage patient load.
- GSI AMTAS Flex Tablet-based automated audiometry software requiring no separate audiometer, offering screening and diagnostic air conduction testing with six quality indicators. Configured on Windows tablets with calibrated headphones. Used for portable automated screening and diagnostic audiometry without requiring a full clinical audiometer setup.
- TympStar Pro A clinical tympanometer offering comprehensive middle ear testing including tympanometry with multiple probe tones, Y/B/G immittance, reflex threshold testing, reflex decay, ARLT, Multi Hz, and ETF tests. Used by clinical audiologists and ENT specialists for comprehensive middle ear assessment.
- Allegro A handheld screening tympanometer capable of performing tympanometry and ipsilateral reflex testing on the go, designed for portability and ease of use. Used for portable middle ear screening in pediatric settings, schools, and field screening programs.
- GSI 39 A flexible combination screening device for tympanometry with options to add audiometry testing, available in five versions to meet varying facility demands. Used by clinics and screening programs needing a combined tympanometry/audiometry screening device.
- GSI Corti A portable OAE testing device offering DPOAE and TEOAE tests with pre-defined and user-defined protocols. Suitable for infants, children, and adults for screening and clinical applications. Used by audiologists, hospitals, and pediatric programs for otoacoustic emissions assessment.
- Audera Pro A clinical evoked potentials system also capable of otoacoustic emissions testing, positioned as the next generation to the GSI Audera. Provides significant updates for busy clinical practices. Used by clinical audiologists, hospitals, and specialty clinics for evoked potentials assessment.
- GSI Novus A newborn hearing screening device capable of performing AABR (Automated Auditory Brainstem Response) and OAE testing for early hearing detection in infants. Used by hospitals, birthing centers, and pediatric audiology programs for newborn hearing screening.
- GSI Suite Proprietary audiometric data management software that is Noah-compatible, enabling EMR/EHR data transfer. Provides quick and accurate capturing, saving, and sharing of patient information with direct print capability and session storage. Used by clinical audiologists and hearing clinics for data management and EMR/EHR integration.
- GSI Video Otoscope Video otoscope device that captures otoscopic images and integrates them into GSI AMTAS automated audiometry reports, with workflow guidance for technicians completing otoscopy during an AMTAS session. Used by audiologists performing automated audiometry who need otoscopic documentation within the audiometry workflow.
Quantifiable outcome
- Over 15 years of research and development supporting AMTAS validity
- +1 more outcomes
Companies that use Grason-Stadler
Customer profileSegments5 records
Ideal customer profiles4 records
Grason-Stadler technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
AI capability5 records
Feature5 records
Grason-Stadler partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- International Distributor NetworkcoreGrason-Stadler maintains a worldwide distributor network with over 100 offices in over 70 countries. All international distributors are the exclusive provider of GSI products in their country. Distributors provide sales, installation, ongoing support, and calibration services for customers throughout the product lifecycle.
Scale indicators5 records
Recent moves7 records
Expansion highlights6 records
Grason-Stadler competitors and assessment
Company assessmentDirect peers
- Interacoustics: Denmark-based manufacturer of audiometric, tympanometric, OAE, and evoked potential equipment. Part of the Demant Group, Interacoustics is one of GSI's most direct global competitors across the full audiometric test battery.
- Natus Medical (Otometrics): Natus Medical's Otometrics division manufactures clinical audiometers, tympanometers, and balance assessment equipment used in audiology and ENT clinics worldwide, directly competing with GSI's product portfolio.
- Maico Diagnostics: German-based manufacturer specializing in screening and diagnostic audiometers, tympanometers, and OAE devices. Maico competes head-to-head with GSI in newborn hearing screening and clinical audiology markets globally.
- Inventis: Italian manufacturer of audiometric and tympanometric equipment, including clinical audiometers and middle ear analyzers. Inventis is a direct peer in clinical audiology equipment with comparable product categories to GSI.
- PATH Medical: Germany-based specialist in diagnostic audiology equipment including audiometers, tympanometers, and evoked potential systems. PATH Medical competes with GSI particularly in the evoked potentials and clinical audiology segments.
- Amplivox: UK-based manufacturer of screening and diagnostic audiometers used in occupational health, primary care, and school screening programs. Amplivox overlaps with GSI's screening audiometer (GSI 18) and portable product segments.
Emerging players
- Intelligent Hearing Systems: US-based manufacturer of evoked potential and OAE systems focused on newborn hearing screening and clinical diagnostics. IHSys has focused overlap with GSI's Audera Pro and Novus product lines.
- Echodia: French manufacturer of evoked potential, OAE, and audiometric screening devices. Echodia competes with GSI primarily in OAE and evoked potentials segments across European clinical and research markets.
Broad incumbents
- Demant (William Demant Foundation): Parent of Interacoustics, Oticon, and other hearing healthcare brands. Demant is a broad incumbent whose audiology diagnostics division directly competes with GSI while also offering hearing aids and hearing care services.
- GN Hearing (GN Store Nord): Danish hearing aid giant (parent of ReSound, Beltone) with a diagnostics arm that competes in audiometric equipment. GN is a broad incumbent offering both hearing aids and assessment equipment adjacent to GSI's market.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Grason-Stadler social profiles
Digital presenceGrason-Stadler compliance and trust
Trust signalCompliance5 records
Grason-Stadler financial estimates
Financial estimateRevenue estimate
Valuation estimate
Grason-Stadler leadership team
Management profileNumber of profiles
Profiles4 records
Grason-Stadler funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Grason-Stadler M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Grason-Stadler
What does Grason-Stadler do?
Grason-Stadler designs, manufactures, and distributes audiometric assessment instrumentation for hearing healthcare professionals worldwide. Its product portfolio spans the complete audiometric test battery including clinical and screening audiometers, tympanometers, otoacoustic emissions (OAE) devices, and evoked potentials systems, complemented by proprietary software (GSI Suite, GSI AMTAS, GSI Cloud) for automated audiometry and EMR/EHR-compatible data management. Products are sold exclusively through a global network of more than 100 distributor offices across over 70 countries and supported for the product lifecycle with consultation, installation, and calibration services.
Is Grason-Stadler a public or private company?
Grason-Stadler is a private company. It is classified as unknown and is currently operating.
When was Grason-Stadler founded?
Grason-Stadler was founded in 1949. It employs 101 to 250 people.
Where is Grason-Stadler based?
Grason-Stadler is headquartered in Eden Prairie, United States, in the North America region.
How does Grason-Stadler make money?
Two revenue lines are on record. Audiometric Equipment Sales are the primary driver. The others are software Licenses.
Who are Grason-Stadler's main competitors?
Direct peers on record are Interacoustics, Natus Medical (Otometrics), Maico Diagnostics, Inventis, PATH Medical and Amplivox. Emerging players are Intelligent Hearing Systems and Echodia. Broad incumbents are Demant (William Demant Foundation) and GN Hearing (GN Store Nord).
Does Grason-Stadler have an API?
No public API is recorded for Grason-Stadler.
What industry is Grason-Stadler in?
Grason-Stadler's product category is Audiometric Diagnostic Equipment. Its primary akta.pro industry code is HLAFAKAH, Audiology & Hearing Diagnostic Centers. Its NAICS code is 334510 and its SIC code is 3841.