BrowserBill is one of the lesser-known Chrome extension payment platforms. If you found it, you probably found it by searching for an ExtPay alternative — AlternativeTo's listing literally describes it as "nearly indistinguishable" from ExtensionPay. Same drop-in SDK pattern, same Stripe integration, same 5% transaction fee, same shape.

If you're already on BrowserBill and hunting for an alternative — either because the 5% fee is compounding, the feature set is missing pieces, the smaller ecosystem makes you nervous, or you've outgrown the basic dashboard — this is the consolidated comparison. Every real option, what each costs in fees AND engineering time, what migrating actually looks like, and the specific moments in your extension's growth where switching pays for itself.

Long post. Save it for when you're past validation and ready to scale.

What BrowserBill actually is (for the people who don't know)

For developers who arrived at BrowserBill via "what's an alternative to ExtPay," here's the short summary so we're working from the same baseline:

The product: A drop-in JavaScript SDK that lets Chrome extension developers take payments. You add your extension to their dashboard, create plans, embed the SDK, redirect users to a hosted checkout. Stripe processes the actual money.

The fee: 5% per transaction, plus Stripe's ~2.9% + 30¢. Same as ExtPay.

The supported browsers: Chrome, Edge, Firefox, Opera, Brave.

The feature set:

• Recurring subscriptions
• One-time payments
• Multi-device login
• Stripe payment processing
• A dashboard with analytics ("in-depth analytics" per their marketing, though it's still lighter than what an MRR/churn/LTV tool would give you)
• An SDK with paid status checking and openPaymentPage / openManagementPage methods

What it doesn't have:

• A no-code paywall editor
• A/B testing
• Multi-tier entitlements (Pro/Team/Lifetime as native concepts)
• Remote-deploy paywalls (every UI change is a Chrome Web Store re-publish)
• Bayesian or any statistical testing infrastructure
• A migration adapter from other platforms

In other words: it's a competent, minimal payment SDK. If ExtPay's API surface didn't appeal for some reason (interface design, support style, region), BrowserBill is the closest near-clone. The tradeoffs are the same.

Why developers actually leave BrowserBill

I went looking for public BrowserBill threads, GitHub issues, and migration write-ups. The honest finding: there are very few. BrowserBill is small enough that the indie community hasn't generated the same volume of post-mortems that ExtPay has. The complaints that do surface, plus the structural issues anyone hits with a 5%-fee minimal-SDK platform:

1. The 5% fee compounds painfully past $5K MRR. Same math as ExtPay. At $1K MRR, 5% is $50/month — easy to swallow. At $10K MRR, you're handing BrowserBill $500/month on top of Stripe's ~$300. At $50K MRR, $2,500/month. The math gets uncomfortable fast, and there's no public roadmap to suggest the fee will drop.

2. The dashboard is basic. "In-depth analytics" in marketing copy translates to: you can see your transactions and customers, but you're not getting native MRR / trial→paid / churn / LTV / cohort views. For finance work you'll still bounce between BrowserBill and Stripe.

3. Ecosystem is small. ExtPay has ~$500K in lifetime developer earnings publicly documented, plus several years of Indie Hackers threads, plus an active GitHub. BrowserBill has a sparser footprint. If you hit a bug, the community-of-developers-who-also-hit-this-bug is much smaller. Support goes through browserbill.odoo.com (Odoo helpdesk), which signals a small team.

4. No paywall editor. Same problem as ExtPay. The "paywall" is whatever HTML you ship in your popup. Every iteration on copy, layout, or pricing is a Chrome Web Store re-publish — days of review queue each time. You won't be A/B testing your paywall on BrowserBill because the iteration loop is too slow.

5. Single-tier or basic-tier entitlement. BrowserBill has "Plans" — you can create multiple plans and check which plan the user is on. But it's not a structured entitlement system the way modern subscription platforms model pro, team, lifetime as independent capabilities. If you want a user to be both "Pro" and "Team Admin" with different feature gates, you're parsing plan IDs and string-matching yourself.

6. MV3 service worker concerns. Like ExtPay, BrowserBill predates the Manifest V3 architecture. The same chrome.storage.local.get callback re-declarations and other workarounds apply. It works, but the architecture wasn't built around the MV3 service worker lifecycle from the ground up.

7. Single point of failure with limited public roadmap. Small team, no public changelog or roadmap, minimal community signals. If BrowserBill ever stops being maintained, the migration path is "do it manually" — there's no compatibility adapter from another platform, no documented migration tooling.

None of these are dealbreakers at $0 MRR. All of them become dealbreakers somewhere between $2K and $10K MRR depending on your category and how much paywall iteration you want to do.

The 5 real BrowserBill alternatives in 2026

I'm only counting options that actually work for Chrome extensions specifically. Generic Stripe tutorials don't qualify — your extension still needs an MV3-safe entitlement cache, message routing, signed verification, and identity linking. Either the alternative gives you that, or it doesn't.

1. CRXPay — the most direct upgrade path

CRXPay is the closest thing to "BrowserBill or ExtPay rebuilt in 2026 with the features the minimal-SDK platforms never added." Same drop-in SDK pattern, Stripe Connect-native, but it solves the specific limitations above.

Fees: First $2,500 in tracked revenue is free, then 2.5% — exactly half of BrowserBill's 5%. On a $10K MRR extension, that's $250/month back versus $500/month. At $50K MRR, $1,250/month vs $2,500/month.

What it adds vs BrowserBill:

• A real analytics dashboard. Native MRR, trial→paid conversion, churn, LTV — all computed natively. No cross-referencing between two platforms for finance work.
• No-code paywall editor with 8 templates (games, AI credits, lifetime, trial-first, productivity, etc.). Drop in components, edit copy, theme, layout in a WYSIWYG editor.
• Remote-deploy paywalls. Change a price, change copy, swap a layout — every installed extension fetches the new version on next popup open. No Chrome Web Store re-review for copy changes. This is the biggest practical win when you're iterating.
• Bayesian A/B testing. Split traffic between variants, the test picks the winner. You can actually iterate on conversion rate instead of guessing.
• Multi-tier entitlements. hasEntitlement('pro' | 'team' | 'lifetime') instead of plan-string matching. Multi-tier pricing works natively.
• HMAC-signed offline entitlement cache. Pro access survives flaky networks and service-worker registration bugs.
• MV3-native architecture. chrome.alarms-based refresh (not setInterval), top-level event listener registration, message router with return true documented inline. Built around the MV3 service worker lifecycle, not retrofitted.
• Stripe Express Connect-native. One-click Stripe onboarding, no paste-the-key flow. Your Stripe account, they never touch your money.
• Webhooks to your stack. Customer.io, Braze, your warehouse — paid/trial/churned cohorts sync without you writing it.
• Self-serve Stripe Billing Portal pre-authed via one link. Users update cards, cancel, get receipts.

Migration from BrowserBill: This is the part where the comparison gets nuanced. CRXPay's official migration adapter is API-compatible with ExtPay — u/crxpay/compat-extpay. There isn't a published BrowserBill-specific adapter, but the migration shape is identical:

1. Set up CRXPay in test mode alongside BrowserBill
2. Export your customer list and Stripe customer IDs from BrowserBill / Stripe (your Stripe is the source of truth — BrowserBill uses Stripe Connect like every other platform)
3. Import users into CRXPay (your Stripe Connect account stays the same, so subscription objects keep working)
4. Replace BrowserBill SDK calls with CRXPay SDK calls in your extension code — bb.openPaymentPage() → sub.paywall.show(), bb.getPaidStatus() → sub.hasEntitlement('pro')
5. Deploy
6. Existing subscribers stay subscribed because they're still in your Stripe account

The mapping is roughly:

// BrowserBill
const bb = new BrowserBill({ extensionCode: '...' });
const status = await bb.getPaidStatus();
if (status.paid) unlock();
bb.openPaymentPage(planID);
bb.openManagementPage();

// CRXPay equivalent
import { crxpay } from '@crxpay/sdk';
const sub = crxpay({ apiKey: 'pk_live_…' });
if (sub.hasEntitlement('pro')) unlock();
sub.paywall.show();
sub.portal.open();

It's not a one-line import swap like the ExtPay → CRXPay migration, but it's also not weeks of work. Typical BrowserBill migration is probably 4–8 hours of dev work for an extension of average complexity, plus testing.

Time to first payment on CRXPay: ~5 minutes via the quickstart. I've timed it on a fresh project.

Best fit: Anyone past the "do users pay" validation phase. Anyone past $2K MRR where the fee math matters. Anyone shipping multi-tier pricing. Anyone who wants to A/B test paywalls without rebuilding the infrastructure.

Watch out: Newer product than BrowserBill or ExtPay. The mitigation is that Stripe Connect across all these platforms means your customer data is portable — you can leave any of them and your subscribers stay subscribed in your own Stripe account.

2. ExtensionPay (ExtPay) — the lateral move

If you specifically liked BrowserBill's API surface but want a slightly bigger ecosystem with the same shape, ExtPay is the lateral move.

Pros:

• More established (~$500K+ developer earnings since 2021)
• Open-source client-side library
• Larger Indie Hackers / GitHub community
• Cross-browser including Firefox

Cons:

• Same 5% fee
• Same lack of paywall editor / A/B testing
• Same single-paid-boolean limitation (with user.plan.nickname workarounds)
• Same MV3 retrofit story
• Open GitHub issue #145: user.subscriptionStatus disappears across extension versions

Best fit: If your specific BrowserBill complaint is "I want a more proven platform" and you're not yet at the scale where the 5% fee or missing features matter. Lateral move within the same architectural tier.

3. DIY with Stripe + your own backend

Maximum control, maximum work.

Stack: Stripe Checkout + Stripe Webhooks + Stripe Billing Portal + your backend (Cloudflare Workers, Vercel, Railway, Fly) + your DB (D1, Postgres, SQLite) + your own SDK inside the extension.

Time: 3–8 weeks first time. 1–2 weeks if you've shipped Stripe subscriptions before. Plus ongoing maintenance.

Fees: Stripe ~2.9% + 30¢. Zero platform fee.

What you're building:

• Hosted checkout integration
• Webhook handler with signature verification + idempotency
• User → Stripe customer → entitlement mapping in your DB
• HMAC-signed entitlement token system
• MV3-safe background service worker with chrome.alarms refresh
• Per-install identity + email linking
• Refund handling, dunning, smart retries
• Self-serve cancellation flow

Honest warning: Every founder underestimates this 3x. The "I'll just use Stripe directly" approach is where Q1 monetization roadmaps go to die.

Best fit: Backend-confident teams, $200K+ ARR target, custom pricing models that don't fit a platform.

4. Lemon Squeezy (Stripe-owned, Merchant of Record)

The "they handle global tax compliance" path. Acquired by Stripe in 2024, fully integrated 2025.

Fees: 5% + 50¢ per transaction (MoR fee includes EU/UK VAT, sales tax compliance).

Pros: Handles global tax compliance — they're the seller of record. Fast onboarding. Good UI.

Cons: No Chrome extension SDK. You're still building the entitlement check, the MV3 service-worker plumbing, the message routing, the signed offline cache yourself. They give you checkout + tax handling, not extension primitives.

Best fit: Extensions with serious EU/UK revenue where global tax compliance is the actual pain.

5. Paddle — enterprise SaaS option

Veteran subscription platform with full tax handling.

Fees: 5% + 50¢ per transaction. Also Merchant of Record.

Pros: Best-in-class for enterprise — dunning, smart retries, invoicing, PO support, customer portal. Handles ACH for B2B.

Cons: Same as Lemon Squeezy — no extension-specific SDK. Higher minimum scale before the integration overhead pays off.

Best fit: B2B Chrome extensions selling to enterprise, where invoicing and global tax handling matter more than developer ergonomics.

Head-to-head comparison

Feature	BrowserBill	CRXPay	ExtensionPay	DIY Stripe	Lemon Squeezy	Paddle
Platform fee	5%	2.5% (first $2.5K free)	5%	0%	5% + 50¢	5% + 50¢
Setup time	~1 hour	~5 min	~1 hour	3–8 weeks	~1 day	~1 day
MV3-native architecture	Workarounds	Yes	Workarounds	You build it	You build it	You build it
No-code paywall editor	No	Yes (8 templates)	No	No	No	No
Remote-deploy paywalls	No	Yes	No	You build it	No	No
A/B testing	No	Yes (Bayesian)	No	You build it	No	No
Multi-tier entitlements	Plans only	Yes	One bool	You build it	Limited	Yes
Real MRR/churn/LTV dashboard	Basic	Yes	No	You build it	Limited	Yes
Migration adapter from BrowserBill	n/a	Manual SDK swap	n/a	Manual	n/a	n/a
Stripe Connect (your account)	Yes	Yes	Yes	Direct	n/a (MoR)	n/a (MoR)
Community size	Small	Growing	Largest indie	n/a	Large	Large

When does switching from BrowserBill pay for itself?

The honest economics, not the marketing version:

At $0 MRR — Stay where you are. You haven't validated whether anyone pays. Optimize for shipping, not for fees or features.

At $1–2K MRR — Stay on BrowserBill, start planning the migration. Watch what limitations are hurting you. If you keep wanting "I wish I could test two prices," "I wish I had a real dashboard," "I wish I had a Team tier" — that's your signal.

At $2–5K MRR — Switching pays for itself. The math:

• Fee delta on $5K MRR: 5% → 2.5% = $125/month back
• Time savings: 5–10 hours/month not exporting data, hand-managing finance work, building paywall variants in code
• Conversion lift from A/B testing: typical 10–30% paywall conversion improvement, which at $5K MRR is $500–1,500/month

The breakeven for the migration time is roughly the first month after switching.

At $5K+ MRR — You should have switched already. The fee delta alone is $125+/month. Compound that with the conversion lift A/B testing produces and the operational pain of running a real business on a basic dashboard, and the cost of staying is significant.

At $50K+ MRR — Either CRXPay or DIY Stripe. Compare CRXPay's $1,250/month fee at this revenue against the engineering cost of building and maintaining your own stack. DIY breaks even somewhere between $25K and $50K MRR if you have the engineering bandwidth. If you don't, the platform fee is cheaper than the dev time.

The migration playbook (specifically for BrowserBill users)

The single biggest reason developers stay on a payment platform longer than they should is fear of migration. Existing users, in-flight subscriptions, the worry that switching breaks something for paying customers.

The actual migration steps from BrowserBill, in order:

1. Pick your alternative. For most BrowserBill users in the $2–50K MRR range, CRXPay is the lowest-friction upgrade because of the feature delta. ExtPay is a lateral move (same fee, slightly bigger ecosystem). DIY Stripe is the long-term play if you have the engineering budget.

2. Confirm your Stripe Connect status. BrowserBill uses Stripe Connect, so your Stripe account is the source of truth. Your customer records, subscription objects, and webhook history live in Stripe regardless of which platform sits on top. This is the critical fact that makes migration possible without losing users.

3. Set up the new platform in test mode. Don't touch production. Get a 4242 4242 4242 4242 test payment working end-to-end on the new platform alongside BrowserBill.

4. Export your customer list from BrowserBill / Stripe. Stripe's customer export contains every paying user. The new platform can import these and re-link them — your active subscriptions keep renewing through the same Stripe Connect account.

5. Map your SDK calls. This is the only "real code" step. For CRXPay, the mapping above (bb.openPaymentPage() → sub.paywall.show(), bb.getPaidStatus() → sub.hasEntitlement('pro')) is the bulk of it. Usually 4–8 hours of work for a single extension.

6. Deploy to a percentage of users first. If your build framework supports a staged rollout (Chrome Web Store does support this — "Partial publish"), ship the new payment stack to 5–10% of users first. Watch for 48 hours. If no support tickets, ramp to 100%.

7. Verify with real users. Watch the first 48 hours after full rollout. Check that subscription checks still resolve, no users are mistakenly downgraded, webhooks fire correctly on renewals.

8. Start using new features. Now enable multi-tier entitlements, paywall editor, A/B testing, analytics. The migration is done; this is the upside.

Grandfathering edge cases for BrowserBill specifically:

• Users mid-trial when you migrate. Their trial state lives in Stripe (subscription with trial_end set). It carries over automatically. Verify on the new platform's customer view.
• Annual subscribers with months remaining. Same Stripe subscription object, just a different webhook recipient. Price doesn't change.
• Users on past-due payments. Stripe's dunning continues regardless of which platform is consuming the webhook. The new platform's dunning UX is usually better than BrowserBill's anyway.
• Users who paid via "Plans" with custom features attached. This is the one tricky case. If you've been encoding feature access by plan.nickname string parsing in your extension, you'll want to migrate to proper entitlements (hasEntitlement('feature_x')) on the new platform. Plan the data mapping carefully — every user's previous plan needs to translate to the right entitlement set.

TL;DR

• BrowserBill is a competent but minimal ExtPay clone. Same 5% fee, same shape, smaller ecosystem.
• Developers leave for five real reasons: the 5% fee compounds, the dashboard is basic, the ecosystem is small, there's no paywall editor or A/B testing, and the architecture predates MV3.
• The switching threshold for most extensions is $2–5K MRR. Beyond that, the cost of staying exceeds the cost of migrating.
• The 5 real alternatives in 2026:
  • CRXPay — direct upgrade, 2.5% fee with first $2.5K free, MV3-native, paywall editor + A/B testing + analytics + multi-tier entitlements. SDK migration is 4–8 hours of work for a typical extension.
  • ExtensionPay (ExtPay) — lateral move, same 5% fee, slightly bigger ecosystem, API-compatible migration adapter from ExtPay → CRXPay exists if you want to ladder.
  • DIY Stripe — 0% platform fee, 3–8 weeks of work, backend teams only.
  • Lemon Squeezy / Paddle — global tax handled, but you build the extension layer.
• Because BrowserBill uses Stripe Connect, your customer data and revenue history are portable — you're never locked in, even if the platform team disappears.
• The migration playbook is 4–8 hours of code work for a single extension, plus 48 hours of monitoring. Most of the fear of migration is bigger than the actual work.

If you're currently running on BrowserBill — especially if you've shipped past $1K MRR — I'd love to hear what's keeping you there or what's pushing you to consider switching. The public data on BrowserBill is genuinely thin (much smaller community footprint than ExtPay), and the more we share real numbers the easier it gets for the next wave of paid Chrome extensions to plan their stacks.