How quickly can I set up a client portal with Selpx?

You can launch a fully branded client portal in under 5 minutes. Simply register, add your logo and brand colors, create a project, and invite your client or share their private access link.

Is the invoice generator completely free?

Yes! Selpx provides a 100% free client-side invoice generator that lets you create and download clean, professional PDF invoices with custom tax rates, currencies, and line items without needing an account.

How does Selpx achieve fast load times?

Selpx is built with Next.js on an edge-cached architecture designed for sub-100ms response times globally, ensuring zero lag for both agency admins and their clients.

Can I collect payments from clients inside the portal?

Yes. Selpx integrates directly with Stripe, PayPal, cryptocurrency, and manual bank transfers with 0% platform commission fees. Clients can view and pay invoices directly in their portal.

Which languages are supported on Selpx?

Selpx is natively localized in 16 languages: English, Arabic, Spanish, French, Persian, Urdu, Hindi, Indonesian, Vietnamese, Filipino, Thai, Malay, Chinese (Simplified & Traditional), Tamil, and Malayalam.

Free Invoice Generator for Web Developers & Software Engineers

Invoice

Your Details (Sender)

Invoice #

Currency

Invoice Date

Due Date

Client Details (Bill To)

Description / Scope Deliverable

Qty / Hours

Rate ($)

Action

Payment Instructions & Notes

Contract Terms & Conditions

Subtotal$5,900.00

Tax / VAT (%)

Discount ($)

Total Amount$5,900.00

Amount Paid ($)

Balance Due$5,900.00

⚡ Generated invoices have zero watermarks and are saved directly to your device.

Industry Invoicing Standards & Tips

🔑

Keep Staging on Your Infrastructure

Host preview environments on your own subdomains until final settlement. Never grant administrative production access before the final balance is paid.

📋

Define Bug vs Feature Scope

Clarify that bugs in agreed specifications are fixed under warranty, but new design or architecture modifications are billed as change orders.

💳

Automate Monthly Retainers

Encourage clients to pay maintenance retainers automatically on the 1st of each month to guarantee priority developer availability and server uptime.

🚀 Upgrade from manual PDFs

Tired of sending static PDFs and chasing unpaid invoices?

Selpx gives you a 5-minute white-label client portal with Stripe payments, file approvals, live messaging, and automatic payment reminders. 0% transaction commissions.

Start Free (5 Clients Free) →

Frequently Asked Questions

Everything you need to know about professional client billing

How should web developers structure invoices for clients?▼

Web developers should clearly differentiate between upfront milestone deliverables (e.g. Sprint 1 MVP Frontend, PostgreSQL Schema & REST API) and ongoing hourly support or monthly maintenance retainers. Itemize environment configuration, third-party API webhook setups, and automated testing suites so clients understand technical scope.

What payment terms work best for software development contracts?▼

For project-based dev work, a milestone payment structure (e.g., 30% kickoff deposit, 40% staging deployment/QA sign-off, and 30% production deployment) is the safest model. For ongoing work, Net 14 or upfront monthly retainer billing on the 1st of each month ensures predictable cash flow.

When should developers hand over source code repository access?▼

Always host the staging build on your own server or private repository during development. Full ownership transfer of GitHub repositories, domain DNS, and cloud production infrastructure should only happen once the final invoice has cleared in full.

How do I handle third-party software licenses and cloud hosting costs?▼

Third-party cloud costs (AWS, Vercel, Supabase, SendGrid) should be billed directly to the client credit card whenever possible, or itemized on your invoice under "Reimbursable Expenses" with a standard 10–15% administrative handling markup.