Flat Invoice vs Billr
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 Billr
| Detail | FI
Flat Invoice | 
Billr |
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| What it does | Send the invoice. Skip the chasing.
| Invoicing for coding agents integrated with MCP
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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
| Not given
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| Pricing model | Freemium
| Freemium
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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.
| Self-hosted: Free (Apache-2.0 license). Hosted: $19 per business per month after 14 days free trial.
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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
| - MCP integration with 53 tools for Claude Code, Codex, and other MCP clients
- Invoice drafting with line items, taxes, discounts, and payment terms
- Estimates that convert to invoices without retyping
- Time tracking with timer or manual entry
- Expense logging and categorization
- Receivables aging, profit and loss, and top-client reports
- Stripe payments with 0% platform fee
- Branded PDF invoices and estimates with logo and colors
- Scoped API keys that can be revoked at any time
- Permission controls for agent actions
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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
| - Agents work directly in billing with human-approved permissions and pricing
- All agent actions appear in dashboard before reaching clients
- Same application for both self-hosted and hosted use
- No per-invoice or per-client fees
- Full control over agent permissions and workflow
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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 | 4 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 2 |
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| Citation Flow (Majestic) | 12 | 22 |
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| Referring domains (Majestic) | 3 | 6 |
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5 details filled in for both companies.
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