Stacks vs. Tuna Comparison Chart

Square POS is a simple and intuitive point-of-sale (POS) solution that delivers a robust set of tools for sales tracking, inventory, online payment processing, digital receipts, and analytics. Available for Android and iOS devices, Square POS provides a recording of transactions offline by storing data locally and then automatically syncing all information when their is an Internet connection. Additionally, Square POS enables users to seamlessly manage details, such as names, prices, and quantities and provides features such as a barcode scanner, discounts, credit card processing, gift cards, refunds, and more. Whether or not your business has a brick-and-mortar location, building a robust online presence can help you engage customers from a distance. Square’s online solutions work with any of the above point-of-sale systems, or you can use them on your own. We give you the tools to create thumb-stopping, compelling, and on-brand ads that perform.

NMI Payments is an embedded payments solution that lets SaaS platforms, Software companies and ISVs integrate, brand, and manage payment acceptance directly within their software—without becoming a PayFac or building complex infrastructure. As a full-stack processor, acquirer, and technology partner, NMI handles onboarding, compliance, and risk so you can stay focused on growth. The modular, white-label platform supports omnichannel payments, from online, mobile and in-app to in-store and unattended. Choose from full-code, low-code, or no-code integration paths and launch in weeks, not months. Built-in risk tools, flexible monetization, and customizable branding help you scale faster while keeping full control of your experience. With NMI’s developer-first tools, sandbox testing, and modern APIs, you can embed payments quickly and confidently.

EBizCharge is the leading embedded payments application for businesses to accept payments directly inside QuickBooks, Microsoft Dynamics, NetSuite, SAP, Acumatica, and 100+ other business systems. Trusted by 20,000 companies and voted best fintech solution by the Globee® Awards, EBizCharge combines modern billing tools with integrated payment processing to help B2B companies get invoices paid faster, eliminate manual work, and keep payment data automatically synced to their ERP. Companies use EBizCharge to: ◉ Accept credit card, debit card, and ACH payments natively in their ERP, CRM, or shopping cart ◉ Automate billing and reconciliation to save time and reduce errors ◉ Speed up collections with easy billing tools: payment links, online customer portal, recurring billing, saved cards, and more ◉ Reduce risk with enterprise-grade security certified by the PCI-Security Council: PCI-compliance, encryption, and tokenization

Juspay's Payments Orchestration Platform offers a comprehensive product suite for businesses, including open-source payment orchestration, global payouts, seamless authentication, payment tokenization, fraud & risk management, end-to-end reconciliation, unified payment analytics & more. The company’s offerings also include end-to-end white label payment gateway solutions & real-time payments infrastructure for banks. These solutions help businesses achieve superior conversion rates, reduce fraud, optimize costs, and deliver seamless customer experiences at scale. Trusted by leading enterprises across the US, Europe, LatAm and APAC, Juspay’s no-code platform enables businesses to integrate 300+ local payment methods across 50+ countries, design a pixel-perfect checkout UI, deploy seamlessly across all platforms, launch customizable offers & incentives, reconcile your transactions across PSPs & channels, and track PSP performance & buyer conversion.

PayKings is a merchant account provider that helps businesses secure payment processing services in industries often rejected by traditional payment processors. The platform offers merchant accounts, payment gateways, and payment processing solutions designed to support businesses with specialized risk profiles. What is a high risk merchant account? A high risk merchant account is a payment processing account for merchants that are classified in a high risk category. They require high risk credit card processing solutions. The PayKings Team can get you approved today for a low to high risk merchant account for B2B, eCommerce, or Retail at reduced rates and fees. Credit repair merchant accounts are essential for companies in the credit repair space. You provide credit solutions to your customers and we’ll take care of the payment processing. Selling any type of merchandise through an ecommerce store has its risks.

RetailEdge is an easy to use and feature-rich point of sale (POS) and inventory management software solution for retail businesses. RetailEdge offers multi-location support, credit card processing, website integration, mobile POS, and gift card management capabilities within a suite. The solution supports secure and mobile payments like EMV and Apple Pay and integrates with multiple e-commerce platforms for efficient order processing and price updates. RetailEdge was developed in June of 1989 to provide a powerful, flexible, full-featured POS software and hardware solution at a reasonable price that is easy to install, use, and configure, but also affordable to maintain and run. We strongly believe that a good POS solution, in addition to providing great features for a low price, must be supported well. So we have developed a strong support system that provides a backbone of local resellers and quick access to US-based Tier 3 (highest) level support.

Odoo is a fully integrated, customizable, open-source software packed with hundreds of expertly designed business applications. Odoo’s intuitive database is able to meet a majority of business needs, such as: CRM, Sales, Project, Manufacturing, Inventory, and Accounting, just to name a few. Odoo is an all-in-one software solution designed to meet the needs of companies, regardless of their size (or budget). The unbeatable, seamless nature of Odoo helps businesses become more efficient by reducing redundant manual processes, which helps companies save countless hours of labor. Every module is interconnected to provide a fully-integrated experience from app to app, and users can automate many processes that would’ve otherwise required manual inputs into multiple applications. Odoo keeps all business functions in one place, allowing teams to collaborate with other departments from one unified platform in the most efficient way possible.

Gr4vy's no-code payment orchestration platform empowers enterprises with full control to automate, customize, and optimize their payment strategy. Through a single integration, businesses can access +400 payment methods, anti-fraud tools, and payment service providers, enabling them to optimize their stack in just a few clicks, all in a centralized platform. While a PSP is incentivized to route transactions through its own infrastructure, Gr4vy remains agnostic. Built on dedicated cloud instances, Gr4vy infrastructure is the only one that eliminates the risk of a single point of failure, ensuring redundancy and high performance. As the only orchestrator with edge computing, all data and transactions are separate from others, minimizing the risk of a data breach, providing data sovereignty, reducing latency, and increasing efficiency. Gr4vy future-proofs payment stacks with flexibility, scalability, simplicity, and innovation—enhancing performance along the way.

We are a veteran owned business with over 70% veteran workforce, owned and run by former Navy SEALS. We are also a proud Official Partner of the Navy SEAL Foundation and an Executive Sponsor of the SEAL Legacy Foundation. Are you looking for a new point of sale system for your gun store? Trident 1 is the premier provider of the first all-in-one FFL software designed specifically for the firearms retail industry. Created to replace multiple outdated software systems with one universally integrated solution, Trident 1 streamlines and consolidates ALL systems into a single solution to save you time and money. You can access Trident 1 from anywhere on any device, so you’re always in control of your retail operations. We specialize in retail sales, range management, compliance, industry leading integrations, secure payment processing, and excellent, US based customer service.

Revaly is a Payment Performance Management platform designed to ensure that every legitimate transaction succeeds, protecting the recurring revenue businesses depend on. It uses exclusive issuer signals, network intelligence, and AI-powered optimization to maximize payment approvals across the entire lifecycle. By preventing avoidable failures at the first attempt and intelligently recovering declined payments, Revaly reduces involuntary churn and strengthens customer relationships. The platform continuously analyzes routing errors, behavioral patterns, and ecosystem signals to turn unpredictable payments into predictable revenue. Subscription-based companies rely on Revaly to lift approval rates and compound revenue growth without disrupting their existing billing stack. With over 100 integrations, the system fits seamlessly into current workflows while delivering measurable, long-term financial impact.