Open Source Alternatives to Simon

A leading payment gateway and financial services platform for businesses in India.

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Subscription management and recurring billing platform for SaaS and e-commerce businesses.

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AI-powered platform for managing and optimizing B2B payment workflows.

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AI-driven ledger management solutions for financial technology operations.

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AI-powered profit floor solution for Shopify Plus merchants using NetSuite, preventing orders from shipping below margin.

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Shopify provides a leading e-commerce platform that enables businesses of all sizes to create online stores, manage products, process payments, and fulfill orders, simplifying digital sales globally.

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Plaid provides a data transfer network powering fintech and digital finance products.

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Global fintech-as-a-service platform enabling businesses to accept, send, and manage funds worldwide.

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Stripe, Inc. is an Irish-American multinational financial services and software as a service company dual-headquartered in South San Francisco, California, Unit

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Financial infrastructure platform enabling businesses to accept payments and manage global operations.

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Business banking.

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Commerce enablement technology powering billions of transactions for businesses globally.

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Buy Now, Pay Later service enabling interest-free installment payments for consumers.

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Online payment gateway and financial services provider for businesses in Turkey and emerging markets.

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All-in-one revenue engine for AI agents, handling pricing, subscriptions, billing, and renewals.

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An open banking payment platform enabling real-time account-to-account payments globally.

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Self-custodial key management and white-label wallets for platforms integrating Web3.

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Global payment infrastructure provider enabling businesses to accept and make payments worldwide.

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A payment infrastructure company enabling account-to-account payments.

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Client onboarding and digital account opening platform.

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Subscription infrastructure for mobile apps, simplifying in-app purchases and subscriptions.

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Real-time finance infrastructure for Web3, enabling per-second value transfer and automated continuous payments.

Open source · Self-hostable

Building the infrastructure for the onchain internet with smart wallets and cross-chain payments.

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Payments infrastructure for banks, fintechs, and software platforms.

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Payments orchestrator for AI agents, enabling secure, encrypted payments via API and wallet.

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Reimagining patient financial engagement in healthcare through technology.

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Agentic payments platform powering frictionless money movement between AI agents, businesses, and consumers.

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Lava Payments is a fintech startup providing a payment orchestration platform for businesses to manage and optimize their payment flows.

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AI-powered platform for financial services.

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AI-powered platform for automating and optimizing B2B payments and financial operations.

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Enterprise loyalty and affinity program solution serving millions of users.

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AI-powered platform for managing and optimizing business finances and payments.

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A financial infrastructure platform offering payment processing, banking-as-a-service, and business tools for internet companies.

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Business banking and financial tools for startups and growing companies.

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Aemetis is a renewable fuels and biochemicals company focused on low-carbon solutions like RNG and SAF.

Open source · Self-hostable

Innovative fintech solutions platform launching soon. Subscribe for updates.

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A platform for company registration, Mercury bank account opening, and Stripe payment integration.

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Secure payment solution for AI agents using virtual credit cards and stablecoins.

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AI-powered platform for automating and optimizing financial workflows for businesses.

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Online payment gateway for businesses in Paraguay, offering QR, Tigo Money, and Personal Pay integrations.

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AI-powered accounts receivable automation platform that streamlines invoicing, payment collection, and customer communication for businesses.

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Fatturapa.ai offers advanced electronic invoicing and tax compliance solutions for businesses.

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Velocitypay offers a payment processing platform for businesses, focusing on seamless integration and efficient transactions.

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Forter provides an AI-powered trust platform for digital commerce, preventing fraud and abuse while maximizing revenue.

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Paddle is a comprehensive payments, tax, and subscription solution for SaaS companies.

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Technology platform for financial advisors to manage client relationships and operations.

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Embedded earned wage access for employees, integrated with HR platforms.

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Online cross-border financial services platform for international workers and migrants.

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Developer-first API infrastructure for stock, options, and cryptocurrency trading.

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Identity risk management platform for financial institutions and fintechs to automate onboarding, fraud prevention, and compliance.

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Unified platform for managing digital wealth with crypto wallets, debit cards, and banking services.

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High-performance blockchain powering decentralized applications and crypto projects.

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AI-powered platform for managing private investment operations and investor communications.

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A payment service provider that simplifies online payments for businesses.

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API for HR, payroll, and benefits administration.

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April provides embedded tax solutions for modern financial platforms, offering tax filing and planning capabilities.

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Pioneering the first AI-native financial institution for autonomous AI agents.

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BitPay is a cryptocurrency payment service provider facilitating transactions for businesses and individuals.

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Sapiom provides a cloud platform enabling AI agents to access tools under a usage-based billing model.

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Tokenization and data security platform for managing sensitive payment data, enabling agentic commerce.

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