Chargebee
Recurly
Maxio
Zuora
Stripe
Stripe Billing
SaaSOptics
Pabbly Subscriptions
ForthWrite
Superhuman
Gemini
Lavender
Mailmeteor
Spark Mail
Bill with clarity Send beautiful invoices that capture everything - accurate proration, the right taxes, relevant notes for line items - with complete compliance adherence.
Manage subscriptions together Let different teams access information based on user roles, so that they can: Extend trials. Edit plans. Issue refund receipts. And perform other essential tasks with a few clicks.
Measure what matters Access accurate subscription metrics (MRR, LTV, ARPU, Churn...) to see how your business is doing, and to ask the right questions.
Recover lost revenue Fight involuntary churn with a smart dunning process that works with automated reminders, and configurable retry rules (Credit card failed? Try PayPal).
Close books faster Draw revenue recognition reports based on your business requirements. And with our Xero and QuickBooks Online integrations, reconciliation is a click of a button.
ForthWrite is an AI email writing assistant for Gmail and Outlook that learns your writing style from your real sent mail. The more you use it, the more it sounds like you. Get smart drafts in seconds, auto-draft replies before you open your inbox, and maintain your personal voice at scale. Free to start, no credit card required. Works inside Gmail and Outlook on the web.
How it works
ForthWrite captures your tone, sentence rhythm, and sign-offs from your actual sent emails, then uses that profile to generate drafts that match how you write, not a generic AI voice. Every draft you edit or send improves the model over time.
Key features
Who uses it
Professionals who send high volumes of relationship-critical email: lawyers, financial advisors, recruiters, account executives, founders, and anyone who wants their inbox handled without sounding like a chatbot wrote it.
Pricing
Free tier includes 10 drafts per week with no credit card required. Paid plans start at $12/month and include unlimited drafts, custom persona prompts, and auto-draft.
Chargebee ForthWriteChargebee is recommended for SaaS businesses, startups, and enterprises that require sophisticated subscription management and invoicing solutions. It is particularly well-suited for companies needing to manage recurring billing, handle multiple pricing tiers, and gain insights from detailed financial reporting.
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ForthWrite's answer:
Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API
ForthWrite's answer:
ForthWrite learns your writing style from your actual sent mail, not a generic prompt. Every draft sounds like you wrote it because it was trained on how you actually write. It also auto-drafts replies before you open your inbox, so your email is partially handled before your day starts.
ForthWrite's answer:
Most AI email tools give you a blank box and a "write for me" button. ForthWrite builds a voice profile from your sent history and gets more accurate with every draft you edit or send. Unlike ChatGPT or Gemini, it works natively inside Gmail and Outlook with no copy-paste. Unlike Lavender, it writes the draft, not just scores it.
ForthWrite's answer:
Professionals who send high volumes of relationship-critical email and cannot afford to sound generic: lawyers, financial advisors, recruiters, account executives, consultants, and founders managing their own inbox.
ForthWrite's answer:
Built out of frustration with AI writing tools that produce text that sounds nothing like the person sending it, and as a way to handle large amounts of daily email. The core insight was that your sent mail is the best training data you already have, and no tool was using it.
I built ForthWrite because I kept sending emails that sounded like they came from the same generic AI as everyone else. After launching it, I still use it for my own inbox every day, which is about the most honest endorsement I can give.
The Chrome extension lives inside Gmail and Outlook on the web. Open a thread, hit Alt+Shift+D, and a draft comes back in your voice, not a template. The free tier is real: 10 drafts per week, no API key, no credit card. Voice matching is included on free, because that is the point.
What keeps it useful compared to Gemini or a chat tab: it learns from what you actually send. Every edit you make before hitting send becomes a signal. Over time the drafts drift closer to how you really write, and the dashboard shows the improvement curve so you can see it happening.
The web compose surface lets you draft from forthwrite.ai without installing anything, useful for people who want to try before committing to the extension.
Standard adds recipient-aware and intent-aware drafting plus AI coaching. Pro adds auto-draft (replies waiting when you open Gmail), batch replies, and Prompt Lab for version-controlling your prompts. Teams adds a shared persona and seat-level analytics.
ForthWrite is not for everyone. If you just need quick replies and tone does not matter, Gemini is free and already in your inbox. ForthWrite is for people where tone does matter: client communication, relationship-driven threads, external correspondence where sounding off costs something real.
Disclosure: I am the founder and use it daily. Happy to answer questions in the comments.
Based on our record, Chargebee seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I personally use Stripe, but I think https://chargebee.com supports PayPal. I've heard good things about them. - Source: Hacker News / about 4 years ago
The system is very complex, I believe that for these construction sites there is no way to do it and it will have a very ugly design. Why did you choose chargebee.com as your payment method? The stripe seemed to me better, or even the iugu. Do you speak from your own experience? Source: about 5 years ago
Newer organizations, especially in software, still treat engineering as a cost and allocate resources based on the cost that is saved by deploying this skill across the organization. Thus we see 100s of companies building their own recurring subscription infrastructure when multiple SaaS companies exist to solve this problem. Non-customer facing development improves efficiencies within the organization, but... - Source: dev.to / about 5 years ago
Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.
Superhuman - Superhuman is an email management tool.
Maxio - Chargify is the best online billing software for all of your Recurring Billing needs. Learn more about simplifying your Subscription Billing today.
Gemini - Gemini, formerly known as Bard, is a generative artificial intelligence chatbot developed by Google. Based on the large language model (LLM) of the same name, it was launched in 2023 in response to the rise of OpenAI's ChatGPT.
Zuora - Zuora creates cloud-based software on a subscription basis that enables any company in any industry to successfully launch, manage, and transform into a subscription business.
Lavender - Realtime coaching for sales emails.
