Pricing models for document processing tools tend to fall into three categories: per-page, flat-rate, or credit-based. Each makes different tradeoffs, and for document AI specifically, two of them have fundamental problems.
The problem with per-page pricing
Per-page pricing sounds simple: you pay a fixed amount for every page processed. But it ignores a critical variable — the AI model used to process that page.
A one-page typed invoice processed with a standard model costs the provider roughly $0.001 in API fees. The same page processed with a premium vision model costs 50 to 100 times more. Per-page pricing either charges you the premium rate for every page (expensive for simple documents) or the standard rate for every page (unsustainable for the provider, which means the quality is standard-tier across the board).
The result is either overpaying or underdelivering. Neither is good.
The problem with flat-rate pricing
Flat-rate plans charge a fixed monthly fee for unlimited processing. This sounds appealing until you realize the economics force the provider to throttle usage, degrade model quality, or cap processing in non-obvious ways.
If a team suddenly processes 10,000 pages in a month instead of their usual 500, the provider absorbs the cost. This means flat-rate providers either set the price high enough to cover worst-case usage (expensive for everyone) or quietly limit what you can do (frustrating for heavy users).
Flat-rate also disconnects price from value. A team processing 50 pages a month pays the same as a team processing 5,000. The light user subsidizes the heavy user.
How credits work
Credits are a universal unit of consumption that maps directly to the actual cost of processing. See pricing for current plan details.
Here is the formula:
Credit cost = page count × model credit multiplier
Standard models have a low multiplier (fewer credits per page). Premium models have a higher multiplier (more credits per page). You choose the model, you see the credit cost before processing, and you pay proportionally to what you actually use.
This means:
- Simple documents processed with standard models cost very little
- Complex documents that need premium models cost more, but you only use premium when you need it
- You control the tradeoff between cost and quality on a per-conversion basis
A worked example
Take a team processing 500 vendor invoices per month. Most invoices are clean, typed PDFs. About 15% are scanned or handwritten.
With per-page pricing (hypothetical $0.10/page): 500 pages × $0.10 = $50/month. But you are stuck with whatever model the provider chose. If it is a standard model, the handwritten invoices will have errors. If it is a premium model, you are overpaying for the 425 clean invoices.
With credits:
- 425 clean invoices × standard model (2.0 credits/page) = 850 credits
- 75 scanned invoices × premium model (8.0 credits/page) = 600 credits
- Total: 1,450 credits
On PaperAI's Business plan ($39/month), you get 3,000 credits per month. This team uses about half of their monthly allowance, leaving room for other document types or volume spikes.
The clean invoices cost almost nothing. The difficult ones cost more, but you only pay the premium when it matters. Total cost is lower and quality is higher.
Cost transparency
One of the most important aspects of credit-based pricing is that you see the cost before you commit. PaperAI shows the estimated credit cost in the Converter before you click "Convert," based on the page count and selected model.
No surprises. No end-of-month bill shock. You know what you are spending as you spend it.
Credit allowances and top-ups
Each PaperAI plan includes a monthly credit allowance:
| Plan | Monthly Credits | Price | |------|----------------|-------| | Free | 100 | Free | | Pro | 1,000 | $19/mo | | Business | 3,000 | $39/mo | | Scale | 10,000 | $99/mo |
If you need more credits during a billing cycle, top-up packages are available:
- 500 credits for $9.99
- 2,500 credits for $39.99
Top-up credits do not expire at the end of your billing cycle.
When credits make the most sense
Credit-based pricing works best when:
- Your document mix varies (some easy, some hard)
- You want to control the cost-quality tradeoff per document type
- Your volume fluctuates month to month
- You want predictable pricing without per-page uncertainty
If you always process the same volume of the same document type, flat-rate might be simpler. But for most teams dealing with diverse document types and varying volumes, credits give you flexibility without waste. See the full list of features available across each plan tier.
For more on what manual processing actually costs your team, see the real cost of manual data entry.
Related resources
- Pricing plans — compare Free, Pro, Business, and Scale plans
- Features overview — what each plan tier includes beyond credits