If you’re a founder testing subscriptions at low volume, the “best” free recurring billing platform is usually the one with:

• no monthly platform fee
• easy setup
• support for trials/coupons/proration
• solid checkout + payment retry logic
• ability to upgrade later without migrating

Here are the strongest free/low-cost options to consider:

1) Stripe Billing

Best for: startups that want flexibility and expect to build around payments
Why it’s good:

• No monthly fee for the basic billing tools
• Excellent subscription/payment infrastructure
• Supports trials, coupons, proration, invoices, dunning, webhooks, and metered billing
• Easy to scale from testing to real usage
• Very developer-friendly

Tradeoffs:

• Not the most “out of the box” if you want a fully branded billing portal and polished SaaS subscription UX without coding
• You still pay payment processing fees

Best if: you have technical resources or a developer-friendly stack.

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2) Paddle

Best for: SaaS founders who want tax handling and merchant-of-record simplicity
Why it’s good:

• Handles VAT/sales tax and compliance in many cases
• Good subscription management features
• Easier than building tax workflows yourself
• Useful if you sell globally

Tradeoffs:

• Not truly “free” in the sense of only card processing fees; pricing is typically a percentage of revenue
• Less flexible than Stripe for custom billing logic
• You’re buying convenience more than saving cost at scale

Best if: you want less operational overhead and don’t mind a revenue share.

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3) Chargebee (Free tier / startup plan depending on current offer)

Best for: teams that want a full billing layer without building everything themselves
Why it’s good:

• Subscription management, invoicing, coupons, trials, dunning, analytics
• Can sit on top of Stripe/PayPal
• Good for SaaS billing workflows

Tradeoffs:

• Free access is often limited by plan, revenue, or time-based startup credits
• Can get expensive once you grow
• More “billing platform” than “simple checkout”

Best if: you want a richer billing system and can fit within a starter program.

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4) Lemon Squeezy

Best for: digital products and simple subscriptions with minimal setup
Why it’s good:

• Fast to launch
• Handles sales tax/VAT in many regions
• Simple checkout and subscription flow
• Good for small founders validating demand

Tradeoffs:

• Typically takes a cut of revenue
• Less customizable than Stripe
• Better for simple use cases than complex SaaS billing

Best if: you want speed and simplicity over deep customization.

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5) PayPal Subscriptions

Best for: very early tests where customers already trust PayPal
Why it’s good:

• Easy to recognize and trust for some buyers
• Can be quick to set up
• Useful as a secondary payment option

Tradeoffs:

• Not usually the best primary recurring billing stack for SaaS
• Subscription management and UX can be clunkier
• Customer experience can be inconsistent

Best if: you want a supplemental payment option, not your core system.

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6) Recurly / Zoho Subscriptions / others

These can work well, but for a founder with limited volume:

• they often aren’t truly free
• they may be overkill unless you need more advanced invoicing and lifecycle automation

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My practical recommendation

If you’re technical:

Use Stripe Billing
It’s the best combination of free-to-start, flexible, and scalable.

If you want the fastest “I just want subscriptions working” option:

Use Lemon Squeezy
Great for validating demand quickly.

If you want tax/compliance handled for you:

Use Paddle
Good if you sell internationally and want less admin.

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What to prioritize for a low-volume founder

Look for:

• No monthly minimums
• Free trial support
• Subscription upgrade/downgrade support
• Customer portal
• Failed payment retry / dunning
• Easy cancellation and refunds
• API + webhooks
• Ability to migrate later

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Simple rule of thumb

• B2B SaaS with dev resources: Stripe Billing
• Solo founder validating fast: Lemon Squeezy
• Global tax-heavy selling: Paddle
• Need advanced subscription ops: Chargebee (if a startup offer fits)

If you want, I can also give you a comparison table with fees, setup difficulty, and best use cases for Stripe vs Paddle vs Lemon Squeezy vs Chargebee.