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Clerk Billing vs Prompt Proxy
Short answer: Pick Clerk Billing if you want drop-in subscription billing UI; pick Prompt Proxy if you want plug-and-play AI billing backend. Both have a free plan.
Clerk BillingSubscription billing, without the webhooks
Prompt ProxyThe billing back-end for your AI appsWhich to pick
Pick Clerk Billing if you want…
- Drop-in subscription billing UI
- Integrations with React, Next.js or Astro (on Clerk Billing's list, not Prompt Proxy's)
Pick Prompt Proxy if you want…
- Plug-and-play AI billing backend
- AI app billing backend
- Integrations with Polar, Google Play Store or Apple App Store (on Prompt Proxy's list, not Clerk Billing's)
Side by side
- What it is
- Clerk Billing:Clerk Billing adds subscription billing to apps with ready-made UI components and no webhook code.
- Prompt Proxy:Prompt Proxy provides billing, credit management, and auth integration for AI apps with three lines of code.
- Best for
- Clerk Billing:Drop-in subscription billing UI
- Prompt Proxy:Plug-and-play AI billing backend
- Who it’s for
- Clerk Billing:SaaS developers who already use Clerk for authentication.
- Prompt Proxy:AI app developers who need quick payment and usage tracking.
- Pricing
- Clerk Billing:Freemium
- Prompt Proxy:Freemium
- Free plan or trial
- Clerk Billing:Free trial
- Prompt Proxy:Free trial
- Plans
- Clerk Billing:Billing Add-on 0.7% of billing volume
- Prompt Proxy:—
- Works with
- Clerk Billing:React, Next.js, Astro, TanStack React Start, Expo, Stripe
- Prompt Proxy:Stripe, Polar, Google Play Store, Apple App Store, Firebase, Supabase, Auth0, OpenAI
Clerk Billing features
- Prebuilt pricing UI. Use <PricingTable/> component to display plans and let users subscribe instantly.
- Unified user & subscription data. Customer subscription status is stored alongside user data automatically.
- Feature gating helpers. Control access with <Show/> component or has() based on plan entitlements.
- Stripe integration. Connect a Stripe account and Clerk syncs payments, methods, and transactions.
- Free trial support. Offer free trials without extra configuration.
- Dev-stage testing. Development instances use Stripe test mode for safe trial of billing flows.
Prompt Proxy features
- Payment Provider Sync. Connect Stripe, Polar, Google Play or Apple App Store to sell credits and handle webhooks automatically.
- Credit Management. Deduct user credits per LLM call with usage-based pricing (per-token, per-request, or rate-limited).
- Auth Integration. Link existing Firebase, Supabase or Auth0 JWTs to user credits without writing auth code.
- Fraud Protection. Built-in rate limiting and abuse detection to protect revenue.
- LLM Provider Support. Proxy calls to OpenAI, Anthropic or OpenRouter via any SDK such as Langchain.
- Developer Dashboard. Real-time credit tracking, subscription management and 99.9% SLA monitoring.
Clerk Billing vs Prompt Proxy FAQ
What is the difference between Clerk Billing and Prompt Proxy?+
Prompt Proxy provides billing backend for AI apps, whereas Clerk Billing targets general SaaS with React components.
Should I use Clerk Billing or Prompt Proxy?+
Pick Clerk Billing if you want drop-in subscription billing UI or integrations with React, Next.js or Astro (on Clerk Billing's list, not Prompt Proxy's). Pick Prompt Proxy if you want plug-and-play AI billing backend, AI app billing backend or integrations with Polar, Google Play Store or Apple App Store (on Prompt Proxy's list, not Clerk Billing's).
Is Clerk Billing or Prompt Proxy free?+
Clerk Billing has a free plan and paid plans. Prompt Proxy has a free plan and paid plans.
Do Clerk Billing and Prompt Proxy integrate with the same tools?+
Partly. Both list Stripe. Clerk Billing also lists React, Next.js, Astro, TanStack React Start and 1 more; Prompt Proxy also lists Polar, Google Play Store, Apple App Store, Firebase and 7 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.