Flat Invoice vs Billsmith
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Flat Invoice compared with Billsmith
| Detail | FI
Flat Invoice | 
Billsmith |
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| What it does | Send the invoice. Skip the chasing.
| Free invoice generator, no sign-up required
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | US
| GB
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| Pricing model | Freemium
| Free
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| Pricing | 3 invoices per month free, then $2 per invoice. Pro plan: $9 per month or $79 per year for unlimited invoices. Edits, resends and reminders are free.
| Free to use. The Billsmith iPhone app is free to start or available as a one-time purchase.
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| Key features | - Automatic payment reminders on day 3, 7 and 14
- Late fee calculator with interest calculation
- Ready-to-send reminder email templates
- Direct client payments
- Optional Stripe integration for card and bank payments
- Free edits and resends
- Free late fee calculator tool
- Unlimited invoice drafts on free plan
| - Create invoices, quotes and receipts
- UK VAT invoice support with HMRC compliance
- CIS deduction calculations for construction work
- Construction reverse charge handling
- US sales tax calculations
- Download PDFs with no server upload
- Local browser storage of business details
- Payment tracking and payment received marking
- Custom payment terms and due dates
- Add business logo to invoices
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| What makes it different | - Never touches client payments or takes a percentage
- Automatic reminders reduce payment chasing
- Free late fee calculator included with service
- Simple pricing with no setup fees
| - Completely free with no sign-up required
- Nothing uploaded to servers, all processing in browser
- Built on official HMRC rules and worked examples
- Covers complex UK tax scenarios like reverse charge and CIS
- iPhone app for creating quotes and invoices on the job
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 12 | 0 |
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| Referring domains (Majestic) | 3 | 0 |
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6 details filled in for both companies.
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