WorkAid — Tools Built for SaaS Businesses

It provides free subscription metrics to help you identify opportunities and then tools to help you reduce churn, optimize pricing, and grow your subscription business end-to-end.

Qonversion allows fast in-app subscription implementation. It provides the back-end infrastructure to validate user receipts and manage cross-platform user access to paid content on your app, so you do not need to build your own server.

Automate billing processes, manage subscriptions and gain insights with UniBee's open-source billing and payment management software.

Automates the recovery of your failed Stripe payments with personalized email and SMS sequences.

Twilio SendGrid's cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. Twilio SendGrid provides reliable delivery, scalability & real-time analytics along with flexible API's.

Amazon SES eliminates the complexity and expense of building an in-house email solution or licensing, installing, and operating a third-party email service. The service integrates with other AWS services, making it easy to send emails from applications being hosted on services such as Amazon EC2.

Mailgun is a set of powerful APIs that allow you to send, receive, track and store email effortlessly.

Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

It is a single module with zero dependencies – code is easily auditable. The email delivery is Secure using TLS/STARTTLS. You can use HTML content, as well as plain text alternative.

Postmark removes the headaches of delivering and parsing email for webapps with minimal setup time and zero maintenance.

Mailjet is a real-time Cloud Emailing platform: scalable, agile and flexible. Our unique algorithm boosts your deliverability and our platform provides in-depth insight so you can optimize more than ever.

A set of billing and subscription tools for developers and business people. Developers can use out-of-the-box functionality to get started quickly or use the composable API building blocks to design fully customized subscription logic and pricing models. Business people can create and manage subscriptions and invoices—and view detailed financial reports.

Chargebee is a subscription billing platform that lets you bill, manage and understand your SaaS or subscription based eCommerce business easily.

SparkPost is the world’s #1 email delivery provider. We empower companies with actionable, real-time data to send relevant email to their customers which increases engagement and both top and bottom line revenue.

We offer one platform that covers all email-related needs in one place: testing, sending, and in-depth tracking to control how email infrastructure works and performs.

It is a modern email sending platform focused on providing the best developer experience. Build, test, and deliver transactional emails at scale.

A platform that takes makes it incredibly simple to sell apps, games and other digital products.  We think that creators should be allowed to focus on building awesome products, so we handle all of the boring things like payments, analytics, customer support and VAT so that they can do just that. Using Paddle's software development kits, developers can easily set up trial versions, licensing mechanisms, in-app purchases and even track performance & usage with Paddle’s in-app analytics technology -- all under a single dashboard.

Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Monthly Recurring Revenue (MRR), Churn, ARPU, Lifetime value and much more. Choose between multiple churn formulas and filter your metrics by custom plans and regions.

RevenueCat is a scalable backend for in-app subscriptions and purchases. It provides all of the tools you need to build, analyze, and grow subscription apps on any platform.

A new kind of transactional email service designed for developers to work faster and smarter with a powerful infrastructure to scale quickly.

It is a premium email delivery and email relay solution that enables you to send and track high volume emails effortlessly. Integrate and start sending in minutes.

Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community.

It is the shopify subscription solution for online businesses. It makes it easy to transform one-time products into subscription options. It was built with the goal of making payments easy for customers. This was primarily by looking for ways for customers to reorder products

It is a drop-in metered billing system that gives you the flexibility to bill how you want. It enables software companies to offer usage-based billing. It helps companies meter customer usage, price according to flexible plans, and bill customers through payment gateways.

It is an email delivery service for your transactional and marketing emails. It replaces your email infrastructure so you don’t have to build, scale, and maintain these systems in-house. With an easy SMTP service you can start quickly, while our robust API gives you full control over email processing and reporting. Your transactional emails are delivered instantly and your marketing campaigns can be scaled to millions.

It is a tool that lets you define and manage your SaaS application's pricing model following best PriceOps practices. It helps you to define a single source of pricing truth that can be safely and easily updated, with a simple JSON definition optimized for SaaS use cases. This keeps everything aligned as you find the best product-market fit.

It is one of the leading online invoice software in the market. The cloud based invoicing and billing software has catered to more than 3.5 million users around the globe since the past 16+ years. The software can be customized according to individual business need and works for Enterprises, Small Businesses and Freelancers.

Transactional emails are the forgotten step child of internet marketers. Apostle.io empowers marketers to manage transactional emails themselves, as they would their list based campaigns. Preview, Update, Analyse and Test your transactional email all in one place.

CloudMailin allows you to receive any volume of incoming email via a Webhook. You are given an email address that will forward any incoming message to your app, as an HTTP POST, within milliseconds. You can also seamlessly check the delivery status of each of your incoming emails via the dashboard, bounce emails that you do not wish to receive and use your own domain name.

It is the speedy transactional email delivery service that provides reliable Inboxing in less than a second, all with a very disruptive pricing model. Only pay for unopened emails.

It is a SaaS platform empowering subscriptions app. It helps companies build and grow their mobile revenues by streamlining In-App Purchase integration.

Easily integrate subscriptions to your iOS app. View key metrics and send events to mobile analytics. Get cancellation insights and increase app revenue.

It is intuitive to use. Use the individual invoice template in your billing program and send your online invoice directly to your customer.

It is a complete online invoice software platform for small business invoicing, billing, reports and more to help you grow. It supports a variety of gateways that accept online payments to serve clients from all parts of the world. Select your favorite payment method and start billing.

Rev.io's back office and telecom billing software allows you to focus your energy on innovation and growth. It delivers a usage-based billing platform and a powerful customer management system to scale with your growing business.

QuoteMachine - Online sales documents that get you paid

WHMDC (WHMDeskCloud) is a self-hosted hosting automation and billing platform. It includes operational intelligence features such as revenue visibility, support performance monitoring, and infrastructure awareness directly within the core platform. Built in the UK, WHMDC focuses on automation, integrations, and a modern client and admin experience without per-client licensing fees.

It is an open-source software for metering and usage-based billing. It's the best alternative to Chargebee, Recurly, or Stripe Billing for companies that need to handle complex billing logic.

Connect your payment provider with LaunchTrack and discover a wealth of actionable intelligence through our realtime analytics, rich customer profiles, and insightful, customized reporting. See your business clearly.

BTMetrics automagically calculates your most important SaaS metrics, so you can throw away the spreadsheets and get back to growing your business.

Offer usage-based billing to your customers without the work. It makes it easy for you to bill your customers based on what they use without a ton of work.

It is a fully self developed solution, truly innovative in several respects, particularly scalable and configurable. This messaging solution offers the entire range of mail services — SMTP, POP3, IMAP, WebMail (Desktop and Mobile versions) — includes List server, Logging, Reporting, and FTP Backup modules and provides various, flexible administration options (including a central Web administration interface — WebAdmin).

Upscribe helps fast-growing eCommerce brands get repeat, loyal customers at scale. We help you move beyond “managing” subscriptions and “dealing” with customers to engaging and delighting them.

API first invoicing service that allows developers to quickly integrate invoicing into their stack. Comes with multi-tenant support and a UI for managing data.

It helps Shopify merchants to sell subscriptions without ripping their hair out. One of the game-changing features is group subscription discounts. The best way to think of this is like Spotify/Sprint family, but for subscriptions. Customers are happy when they get consistently lower pricing (vs. 1-time store credits) and merchants are happy when customers bring in friends at no cost.

It is a self-hosted open-source application that provides a REST interface on top of any email account you have access to read and send emails. Combining these features would give you a similar email sending experience you'd get from a transactional email service.

It is an open-source web & mobile app that helps you track expenses, payments & create professional invoices & estimates.

It is a pricing and billing engine that enables SaaS companies to deploy, monitor, and experiment with custom subscriptions and complex models like usage-based pricing.

It is a fast and convenient solution for effortlessly creating Invoices and Receipts.