Billbooks vs SolidInvoice

Billbooks is an online billing application for freelancers and small businesses, covering invoices, quotes, scheduling, expenses, and reports. It supports recurring invoices, online payments, payment reminders, multi-currency invoicing, digital signatures, and a client portal. Every paid plan includes recurring invoices, automatic reminders, multi-currency support, digital signatures, and reports. Payment gateway options include PayPal, Stripe, Braintree, and Authorize.Net. The public REST API covers invoices, estimates, clients, items, expenses, expense categories, and taxes; API keys are not limited by plan. The API has no webhooks and is limited to 300 requests per five minutes per resource. Xero, QuickBooks Online, and Zapier connectors are available on Professional; Xero connects directly, while the other listed apps connect through Zapier. Billbooks offers iOS and Android apps that sync with the web app, alongside web, macOS, Windows, and API access. Pricing starts with Basic at $7.95 a month. A 30-day trial costs nothing and includes one user, five clients, 100 items, three projects, and five invoices and estimates. Billbooks says it encrypts data in transit and backs it up daily off-server to Amazon S3, with a seven-day retention window.

SolidInvoice is invoicing software for creating recurring invoices, accepting online payments, sending payment reminders, and billing in multiple currencies. It runs on the web, Linux, and macOS. The hosted Solo plan is $9 a month and includes 10 active clients, unlimited invoices, one seat, online payments, recurring invoices, and multi-currency support. Pro is $19 a month, with unlimited clients and invoices, three seats, automated reminders, custom branding, and REST API and MCP Server access. Business costs $39 a month and includes 10 team seats, invoice and quote templates, a custom domain, and dedicated support. A self-hosted plan is listed at free, under the MIT license, for running on your own server with no per-client limits. The pricing note lists a free plan, paid plans from $9/mo, and a 14-day trial. SolidInvoice’s maker was founded in 2013.