Rectangle

Logistics API Platformrectanglehq.com?utm_source=cb

Rectangle is a Chicago-based startup providing a unified API platform that consolidates freight and shipment data across carriers, TMS systems, and billing workflows, serving tech-forward freight brokers, 3PLs, and logistics technology companies.

Company typePrivate
Founded2025
HeadquartersChicago, United States
Headcount1–10
GTM typeB2B
OfferingSoftware

What Rectangle does

Rectangle is a Chicago-based logistics technology startup that provides a unified API platform for freight and shipment data, targeting data fragmentation in the supply chain. The company's core product is a single API endpoint that aggregates shipment data from multiple carrier systems, TMS platforms, and billing systems. Its modular product suite includes the Rectangle API (unified shipment data), an AI-powered LTL Documents API that retrieves shipping documents from carriers including those without public APIs, a Cross-Border Tracking module for US-Mexico visibility, and a Data Sync module that pushes real-time location updates into TMS systems such as McLeod and into AR/AP billing workflows.

The platform is built on TypeScript and Golang using Kafka for distributed messaging, Redis for caching, and Postgres for relational data, with Infrastructure as Code principles and full-stack engineering ownership. The engineering team is approximately four people, with three engineers covering development, testing, infrastructure, and operations. Rectangle serves tech-forward freight brokers, 3PLs, tech-enabled logistics companies, and shippers, with documented case study outcomes including 95%+ tracking coverage for cross-border shipments, 70%+ reduction in manual check calls, 40+ hours saved per week on document retrieval, and 20% improvement in invoice turn time. Named customers include Sunset Transportation (enterprise, 300+ employees, domestic LTL) and RJ Logistics (mid-market, 50+ employees, cross-border truckload).

Rectangle operates on a sales-led, API-first go-to-market motion combining self-service application for access with Calendly-based demo scheduling and limited quarterly spots to create conversion urgency. Onboarding is reported at less than 48 hours. The company is venture-backed and founder-led by CEO Matt Salefski and co-founder Marvin, having raised approximately $4.5M across a June 2024 pre-seed round led by Flybridge and a February 2026 seed round led by Autotech Ventures, with additional backing from strategic industry angels in logistics and software. Pricing is not publicly disclosed and combines subscription and usage-based components. Operating geographies span the United States and Mexico.

Rectangle firmographics

Firmographics

Name: Rectangle
Legal name: Rectangle
Website: https://rectanglehq.com?utm_source=cb
Company type: Private
Founded year: 2025
Operating status: Operating
Headcount range: 1–10 employees
Short description: Rectangle is a Chicago-based startup providing a unified API platform that consolidates freight and shipment data across carriers, TMS systems, and billing workflows, serving tech-forward freight brokers, 3PLs, and logistics technology companies.
Ownership category
akta.pro rank

Rectangle industry classification

Industry

Product category: Logistics API Platform
NAICS: Freight Transportation Arrangement (48851), Freight Transportation Arrangement (488510)
SIC: Arrangement Of Transportation Of Freight & Cargo (4731)
akta.pro primary industry: Customer Visibility Portals & Shipment Collaboration (TLAEADAK)
akta.pro secondary industries: Predictive ETA & Delay Risk Intelligence (TLAEADAB), Truckload/LTL Visibility (Carrier GPS/ELD Telematics-Based) (TLAEADAI)

Keywords

Logistics API platform
Shipment data integration
LTL document retrieval
Cross-border tracking
Freight visibility solutions

Where Rectangle is headquartered

Location

Headquarters

HQ city: Chicago
HQ country: United States
HQ region: North America

Offices2 records

Markets served

Rectangle business model

Business model

GTM type: B2B
Offering type: Software
Cost components: Technology or R&D, Personnel, Marketing or Sales, Infrastructure, Operations

Revenue model

API Platform Subscription: Rectangle provides a unified API platform for logistics data. Customers integrate via API and receive access to shipment data, document retrieval, and tracking services. Revenue likely combines subscription and usage-based components.
API Usage Fees: Based on case studies showing customer onboarding via API integration, Rectangle likely charges based on API usage volume (documents retrieved, tracking updates, data syncs).

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Rectangle product offering

Product offering

Core offering

Rectangle provides a unified API platform that gives logistics companies a single endpoint for every data point in a shipment's journey, from factory to front door. The platform automates shipment tracking, document retrieval, and data synchronization across carriers, pushing real-time information directly into existing TMS and AR/AP systems. It targets tech-forward freight brokers, 3PLs, shippers, and tech-enabled logistics companies seeking to eliminate manual data workarounds.

Product overview

Rectangle is a logistics technology platform consisting of a unified core API (Rectangle API) with modular components including Data Sync, LTL Documents API, and Cross-Border Tracking. The platform serves as an infrastructure layer for modern logistics companies, enabling automated data streams that connect seamlessly across carrier systems, TMS platforms, and billing systems. The architecture combines a universal API gateway with AI-powered document retrieval capabilities specifically designed for the complex LTL ecosystem.

Differentiator

Problem solved

Functional benefit

Products and services

Rectangle API

Quantifiable outcome

95%+ tracking coverage for cross-border shipments
+6 more outcomes

Companies that use Rectangle

Customer profile

Named customers3 records

Segments4 records

Ideal customer profiles3 records

Rectangle technology and API

Technology

Technology focussed Yes

API detail

Has API: Yes
API docs
API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability2 records

Feature4 records

Rectangle partnerships and signals

Strategic signal

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Rectangle competitors and assessment

Company assessment

Direct peers

Shippo: Shippo offers a shipping API and dashboard for multi-carrier label generation, tracking, and parcel data — comparable to Rectangle's API-first shipment data abstraction, though more focused on parcel than LTL/freight.
Turvo: Turvo provides a collaborative TMS platform for 3PLs and brokers with shipment visibility, document management, and workflow automation — competing with Rectangle on TMS-integrated data sync and LTL document retrieval.
EasyPost: EasyPost provides a multi-carrier shipping API for labels, tracking, and verification, similar in architectural approach to Rectangle's unified API; primarily parcel-oriented but comparable in API-first shipment data positioning.
project44: project44 operates a global supply chain visibility network offering carrier connectivity, real-time tracking, and multi-mode visibility — overlapping directly with Rectangle's unified API and cross-border tracking capabilities.
FourKites: FourKites is a leading real-time transportation visibility platform serving shippers, brokers, and 3PLs with predictive ETA, shipment tracking, and yard management — directly competing with Rectangle's tracking and shipment-data API layer for the same freight visibility buyer.
Mercurygate: Mercurygate is a parcel and LTL shipping API and rate-management platform serving enterprise shippers, brokers, and 3PLs — comparable to Rectangle's LTL document retrieval and shipment data unification capabilities.
Shipwell: Shipwell combines a TMS with freight visibility, document automation, and carrier integrations — overlapping with Rectangle's LTL document retrieval and TMS data sync offerings for mid-market brokers and 3PLs.

Emerging players

KlearNow: KlearNow provides AI-powered customs clearance and shipment visibility for cross-border freight — partially overlapping with Rectangle's cross-border tracking and document automation focus, particularly on US-Mexico trade lanes.
Slync.io: Slync.io is a logistics operating system for shippers, forwarders, and brokers providing shipment visibility, document management, and workflow automation — an emerging competitor with overlapping use cases to Rectangle's platform.

Broad incumbents

Descartes Systems Group: Descartes is a long-standing logistics technology incumbent offering a broad portfolio spanning TMS, visibility, customs, and trade compliance — competing broadly with Rectangle across multiple logistics data workflows.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Rectangle financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Rectangle leadership team

Management profile

Number of profiles

Profiles1 record

Rectangle funding detail

Funding detail

Funding overview

Funding rounds2 records

Investors3 records

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

Rectangle M&A and investment

M&A and investment

M&A

Investments

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

Frequently asked questions about Rectangle

What does Rectangle do?

Is Rectangle a public or private company?

Rectangle is a private company. It is classified as venture growth investor backed and is currently operating.

When was Rectangle founded?

Rectangle was founded in 2025. It employs 1 to 10 people.

Where is Rectangle based?

Rectangle is headquartered in Chicago, United States, in the North America region.

How does Rectangle make money?

Two revenue lines are on record. API Platform Subscription is the primary driver. The others are API Usage Fees.

Who are Rectangle's main competitors?

Direct peers on record are Shippo, Turvo, EasyPost, project44, FourKites, Mercurygate and Shipwell. Emerging players are KlearNow and Slync.io. Descartes Systems Group is listed as a broad incumbent.

Does Rectangle have an API?

Yes. Rectangle provides a unified API for shipment data that enables real-time cross-border visibility, document retrieval, and tracking data synchronization. The API allows developers to pass in shipment identifiers (like PRO numbers) and receive instant document retrieval, GPS data from carriers, and real-time location updates. Data is pushed directly into existing TMS systems via webhooks.

What industry is Rectangle in?

Rectangle's product category is Logistics API Platform. Its primary akta.pro industry code is TLAEADAK, Customer Visibility Portals & Shipment Collaboration, with a secondary code of TLAEADAB, Predictive ETA & Delay Risk Intelligence. Its NAICS code is 48851 and its SIC code is 4731.