callus

What callus does

Callus, operating under the legal name CALL US, s.r.o., is a privately held Czech software company headquartered in Ostrava-Hrabová that has marketed auto-parts warehouse management software for approximately 32 years (operations from around 1992; legal entity registered on 15 November 2005). Its core product, APSi, is a Windows-based warehouse management and point-of-sale system built on a MySQL database, purpose-built for small and medium-sized auto-parts retailers and auto-service shops in the Czech Republic and Slovakia. APSi handles stock turnover reporting, customer and product profitability analysis, inventory counts, inter-store transfers, year-end closing, and the specific complexity of multi-supplier part-code normalization.

The product is differentiated by a deep integration layer rather than by algorithmic intelligence. APSi is connected to the TecDoc catalog for parts lookup, to the SOFTEK server for daily pricing and stock feeds from 16+ Czech and Slovak auto-parts distributors (ACI, SAG, Stahlgruber, Azcar, J+M, AdPartner, AutoPartner, Hart, MotoProfil, InterTeam, Jakum, Motorol, MotoGama, Gordon, InterParts), to three e-commerce platforms (WooCommerce, Nextis, Kvikymart) for online-sales synchronization, to Zebra MC32NO handheld barcode scanners for warehouse operations, and to carriers (PPL, Česká pošta, Wedo) and payment sources (FIO Bank, APshop) for shipping-label printing and automatic payment import.

Callus operates a direct-to-customer go-to-market through its website (callus.cz) and phone-based outreach, with no disclosed channel partners or resellers. The revenue model is a recurring monthly subscription: 980 CZK/month for a single-PC license, 1,890 CZK/month for a two-PC network license, plus modular add-ons priced at 250–1,050 CZK/month per connector (e-shop, carrier automation, payment import, supplier data feeds) and pay-as-you-go professional services at 950–1,150 CZK/hour. The company is bootstrapped/founder-owned, has 1–10 employees, has not raised external funding, and discloses no revenue.

Name

callus

Legal name

CALL US, s.r.o.

Website

https://callus.cz

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

1–10 employees

Short description

Callus is a Czech private software firm offering APSi, a Windows-based warehouse management and POS system for SMB auto-parts retailers and auto services in the Czech Republic and Slovakia. The platform integrates TecDoc catalog, 16+ supplier data feeds, e-commerce, shipping, and payment connectors.

Ownership category

akta.pro rank

Product category

Warehouse Management Software

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)

SIC

Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Enterprise Application License Advisory, Vendor Management & Optimization (BPAEAGAO)

akta.pro secondary industry

Catalog & eProcurement Enablement (Punchout, Item Master) (BPAAAJAI)

Keywords

• Warehouse management software
• Auto parts inventory
• Point of sale systems
• Ecommerce integration
• Supplier data feeds

Headquarters

HQ city

Ostrava

HQ country

Czechia

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations

Revenue model

1. APSi Software Subscription: Monthly subscription-based licensing for the APSi warehouse management software. Billed monthly via payment request with invoice follow-up. No initial investment required; all new versions and updates included.
2. E-shop Connector Subscriptions: Monthly subscription fees for online shop connectors (Nextis, APshop, WooCommerce) enabling synchronization between e-commerce platforms and APSi.
3. Supplier Data Feed Services: Monthly fees for access to daily updated supplier pricing and availability data from auto parts distributors in Czech Republic and Slovakia.
4. Professional Services: Hourly-billed services including user training, programming work, on-site servicing, data preparation and analysis, and damaged data recovery.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Callus develops and licenses APSi, a Windows-based warehouse management and point-of-sale software for auto parts retailers and auto service shops. The product handles inventory tracking, order processing, supplier ordering, multi-store transfers, year-end closing, and customer profitability analysis, and integrates with TecDoc catalog data, e-commerce platforms (WooCommerce, Nextis, Kvikymart), Zebra barcode scanners, payment terminals, and daily supplier pricing/stock feeds via the SOFTEK server. Subscription is billed monthly with modular add-ons for e-commerce connectors, shipping automation, payment import, and supplier data feeds.

Product overview

Callus offers a unified warehouse management software ecosystem centered on APSi, with integrated modules for e-commerce, point-of-sale systems, shipping automation, and payment processing. The product suite targets small and medium auto parts retailers and auto service centers in the Czech Republic and Slovakia, with 32 years of market presence. APSi serves as the core platform handling inventory, sales, orders, and supplier integration, while modular add-ons extend capabilities to online sales channels (Woocommerce, Nextis, Kvikymart), payment collection (FIO Bank, APshop), shipping logistics (PPL, Česká pošta, Wedo), and barcode scanning hardware (Zebra). All components are priced via monthly subscription with no initial investment.

Differentiator

Problem solved

Functional benefit

Brands

• APSI: Warehouse software for auto parts stores and car services. Provides inventory management, sales processing, order management, and integration with TecDoc catalog.
• ESHOP
• Pokladní systémy

Products and services

• APSi Warehouse Management Software Windows-based warehouse management and point-of-sale software for auto parts retailers and auto services. Provides inventory tracking, order processing, supplier management, multi-store transfers, customer profitability analysis, and year-end closing. Runs on a MySQL database and supports network deployment. Priced from 980 CZK/month (single PC) to 1,890 CZK/month (2-PC network).
• E-shop Integration Module Integration module that connects APSi with e-commerce platforms including WooCommerce, Nextis Eshop, and Kvikymart. Synchronizes online orders, inventory levels, and payments with the APSi warehouse system. Monthly fee: 1,050 CZK/month per e-shop platform.
• POS Systems (Pokladní systémy) Point-of-sale system integration for auto parts stores, supporting receipt printers, EAN barcode scanners, and opening cash registers as standard features.
• Shipping Automation Add-on (Dopravní automatizace) Standalone subscription add-on providing automated shipping label generation and carrier integration with PPL, Česká pošta, and Wedo within the APSi order processing workflow. Monthly fee: 300 CZK/month.
• Supplier Data Feed Connectors Subscription service providing daily-updated pricing and stock availability data from major Czech and Slovak auto parts distributors (ACI, SAG, Stahlgruber, Azcar, J+M, AdPartner, AutoPartner, Hart, MotoProfil, InterTeam, Jakum, Motorol, MotoGama, Gordon, InterParts). Priced at 320 CZK/month per supplier (unified format) or 480 CZK/month (individual format), plus 1,000 CZK/month server fee.

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration11 records

Feature7 records

Partnerships

Five partnerships are on record, tiered core.

• SOFTEK (server for supplier data)coreTechnology or IntegrationSOFTEK server provides daily supplier pricing and stock availability updates for auto parts distributors. Callus integrates this data into APSi, enabling online stock status, purchase order generation via supplier files, and automated price updates from distributors.
• TecDoccoreTechnology or IntegrationTecDoc is a leading automotive parts catalog system used for parts lookup and identification. APSi is connected with TecDoc online for auto parts e-commerce integration.
• WooCommercecoreTechnology or IntegrationWooCommerce is a WordPress-based e-commerce platform. APSi provides a dedicated robot/connector for synchronization with WooCommerce online stores.
• Nextis eshopcoreTechnology or IntegrationNextis is an e-commerce platform integrated with APSi via a dedicated connector robot for order and inventory synchronization.
• Supplier Data Network (ACI, SAG, Stahlgruber, Azcar, J+M, AdPartner, AutoPartner, Hart, MotoProfil, InterTeam, Jakum, Motorol, MotoGama, Gordon, InterParts)coreTechnology or Integration16+ auto parts distributors in the Czech Republic and Slovakia provide daily price and availability data feeds via SOFTEK server for integration into APSi, enabling real-time supplier data for purchasing decisions.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Stormware (Pohoda): Czech provider of the dominant Pohoda accounting and ERP software for SMBs in the Czech Republic and Slovakia. Directly competes with Callus for SMB software budgets in the same geographies, though Pohoda is a horizontal accounting/ERP rather than a vertical auto parts WMS.
• WinShop (Vipos): Czech retail POS and shop-management software targeting SMB retailers in CZ/SK. Competes with Callus for POS and shop-management spend in small retail stores, including potentially auto parts retailers, though it is a horizontal retail POS rather than vertical auto-parts-specific.

Broad incumbents

• SAP Business One: Global SMB ERP platform widely sold to mid-sized companies, including in Central Europe. Represents the generic ERP alternative that Callus's vertical specialization competes against for the larger end of the auto parts SMB market.
• Seyfor: Czech-based IT and ERP solutions provider serving SMB and mid-market companies across Central Europe, including accounting, ERP, and vertical software. Overlaps with Callus in the broader Czech SMB ERP/WMS market but as part of a much wider portfolio.
• Manhattan Associates: Global enterprise WMS and supply chain software provider. Relevant as the broader WMS competitive backdrop; Callus's vertical auto-parts specialization competes against the lower end of Manhattan's WMS positioning in retail/parts distribution.
• Microsoft Dynamics 365 Business Central: Cloud-based ERP from Microsoft widely deployed across SMBs globally, including in Central Europe. Represents the cloud-native incumbent alternative for SMB auto parts retailers evaluating whether to upgrade from legacy on-premise systems like APSi.

Emerging players

• Lightspeed Retail: Cloud-based POS and retail management platform serving specialty retailers globally. An emerging cloud-native competitor that could pressure on-premise WMS/POS vendors like Callus, particularly among digitally native auto parts retailers.

Others

• TecAlliance (TecDoc): Owner and operator of the TecDoc automotive parts catalog used by Callus as a core integration. Indirectly comparable as the data infrastructure provider underpinning the auto-parts software ecosystem in which Callus operates.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights5 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about callus