Answers to your questions.

Sign up for a free account, click 'New invoice' from the dashboard, add a client, fill in the line items, and hit send. The whole process takes under 30 seconds once you're set up.

No. The Free plan is free forever and requires no credit card. You only pay when you upgrade to a paid plan.

Yes. You can import clients via CSV. Go to Clients → Import, upload your CSV file, and map the columns to Nixus fields.

Nixus works perfectly on mobile browsers — the entire interface is responsive and touch-optimized. A native mobile app is on our roadmap.

Yes. You can add your company logo, change colors, and pick from 4 professional templates. Your branding appears on every invoice and PDF.

Invoices are tied to a single client, but you can quickly duplicate an invoice and reassign it to another client from the invoice view.

Yes. You can bill in USD, EUR, MAD, GBP, and many more currencies. Each invoice has its own currency setting, and reports aggregate by currency.

Absolutely. Each invoice supports a custom tax rate (0-100%) and a discount amount. Totals are recalculated automatically.

Nixus auto-generates sequential invoice numbers per user, formatted like INV-2026-0001. You can customize the prefix and padding in Settings → Company.

Invoices themselves don't support attachments, but you can reference files in the notes. For Pro plans, the client portal lets clients download the PDF anytime.

Open the invoice and click 'Mark as paid', or record a partial payment. Status updates automatically based on the amount paid.

Nixus doesn't process payments directly (yet), but you can add a PayPal link or bank details in the invoice notes. Clients then notify you of the payment.

Record a payment for any amount less than the total. Nixus tracks the balance and marks the invoice as 'Partial' until fully paid.

Yes. Open the payment and click 'Refund'. The invoice balance is adjusted automatically and the payment is marked as refunded.

Yes. Upgrade or downgrade at any time. Upgrades take effect immediately; downgrades take effect at the end of the current billing period.

You'll be prompted to upgrade. Your existing data is preserved — you simply won't be able to create new invoices until you upgrade or wait for the next month.

The Free plan is free forever — no trial needed. Paid plans offer a 14-day trial with full access to all features.

Go to Subscription → Manage → Cancel. Your access continues until the end of the current billing period. No penalties, no hidden fees.

Yes. We use industry-standard encryption (TLS in transit, encrypted at rest), two-factor authentication, and rate limiting. Your data is never shared with third parties.

Yes. You can enable 2FA (TOTP) from Settings → Security. We support any authenticator app (Google Authenticator, 1Password, Authy, etc.) and provide 10 backup codes.

Only you. Invoices are strictly scoped per user. The public view link uses a unique token and only shows the specific invoice it was generated for.

Yes. From Settings → Data → Export, you can download a JSON file with all your clients, invoices, and payments. This is useful for backups or migration.

Your account is soft-deleted: your email and username are anonymized, and you're logged out. Your data is retained for 30 days for recovery, then permanently deleted.

Go to Settings → Profile, update your email, and confirm. You'll need to re-verify the new email before it becomes active.

The Professional plan supports up to 3 team members, and the Business plan supports up to 10. Team management is available from Settings → Team (coming soon).

We use PayPal for subscription payments. PayPal accepts all major credit cards, debit cards, and PayPal balance.

Yes. We offer a 30-day money-back guarantee on all paid plans. Contact support within 30 days of your first payment for a full refund.