Flat Invoice vs ModusBill
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 ModusBill
| Detail | FI
Flat Invoice | 
ModusBill |
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| What it does | Send the invoice. Skip the chasing.
| Billing software for law firms and accounting firms
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| Stage | Not given
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| Founded | Not given
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| Based in | US
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| Pricing model | 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.
| Practice (1–10 users): $30/user/month or $324/user/year; Firm (11–25 users): $27/user/month or $288/user/year; Scale (26+ users): $24/user/month or $252/user/year. 30-day free trial included.
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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
| - Time tracking with billable-hour revisions
- Flat fees and retainers
- IOLTA trust accounting with three-way reconciliation
- Online invoicing with secure payment links
- Online payments via Stripe and PlaceToPay
- LEDES 1998B electronic billing export
- QuickBooks Online two-way integration
- Recurring billing for standing charges
- A/R aging and collection reporting
- Bilingual support in English and Spanish
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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
| - Matter-based organization for law firms and engagement-based for accounting firms in one platform
- IOLTA trust accounting built in with per-client and per-matter ledgers and append-only audit trail
- Every feature in every pricing tier, no modules or per-invoice fees
- Data import from current billing systems with CSV mapping and validation
- Automatic payment posting and reconciliation with online payments
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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 | 15 |
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| Referring domains (Majestic) | 3 | 2 |
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4 details filled in for both companies.
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