How SupWriter Credits, Words, and Plan Limits Work

If you are about to subscribe, the confusing part is rarely the price. It is the three different counters that look like one number: monthly words, per-request caps, and credits. They are related, but they are not the same thing.

This page only uses numbers from the live pricing page and from the product itself (both checked 26 September 2026). If the two ever disagree, the live pricing page is the source of truth for paid-plan prices.

The short version

• One credit is one word of humanize work. Paste 400 words, spend 400 credits.
• Monthly words are the credit allotment that comes with a paid plan (Basic 5,000 / Pro 15,000 / Ultra 30,000 per month on the live pricing cards).
• Per-request caps are a separate ceiling on how long a single paste can be (Basic 500 / Pro 2,000 / Ultra 5,000 words per request on the live pricing cards).
• You can hit the per-request cap with credits still left. You can also run out of credits while the next paste would still fit the cap.

Ready to pick a plan? See pricing or create a free account.

Credits vs words vs the request cap

SupWriter's billing pages talk about "words per month." In the product, those words are stored as credits. For the humanizer, the app deducts one credit per input word.

That is different from two other limits:

Free accounts also have a lifetime pool (no monthly refill) instead of a monthly allotment. Paid plans refill on the billing cycle. Unused plan credits do not roll over.

Free vs Basic / Pro / Ultra

What the pricing page shows (paid plans)

The pricing page lists three paid plans, Basic, Pro, and Ultra, with these allotments and caps:

These are list prices. The pricing page can also show student, regional, or limited-time discounts on top of them, so what you pay at checkout may be lower.

Pro and Ultra also advertise extra-credit packs on the same page: 5k, 10k, 15k, and 20k word packs, with Ultra priced lower than Pro for the same pack.

What is not on the pricing cards: Free

The live pricing page does not currently show a Free card. Free limits are the ones on signup:

• 300 lifetime credits (the "Get 300 free credits" buttons). These do not reset monthly.
• 500 words per request — the same per-paste cap as Basic.

So a free user can paste up to 500 words in one go, but the lifetime pool is 300 credits. In practice the 300-credit lifetime budget is the tighter limit.

Treat the 300-credit figure as the free budget, and 500 as the free paste cap.

How each tool spends credits

What the app deducts:

• Humanize — 1 credit per input word (the words you paste in).
• Paraphrase — 1 credit per word of output.
• Grammar check — 1 credit per word of output.
• AI detection in the web app — paid plans are not charged per word; free users are charged 1 credit per input word. API and MCP detection is metered at 1 credit per input word on every plan.

The live pricing page does not list per-tool rates; the figures above are what the app deducts.

A concrete example

You are on Pro (15,000 words / month, 2,000 words per request):

1. A 1,800-word draft humanizes in one request and spends 1,800 credits. Remaining plan credits: 13,200.
2. A 2,400-word draft is rejected by the per-request cap even though you have credits left. Split it, or upgrade to Ultra (5,000 words per request).
3. After you spend the 15,000 plan credits, Pro can still buy extra credit packs. Basic cannot.

On Free, a 400-word paste would exceed the 300-credit lifetime pool even though it is under the 500-word request cap. In that case the editor offers a partial pass that humanizes only as many words as your remaining credits cover.

Annual vs monthly credits

Every annual plan gets its 12 months of credits upfront: 60,000 words on Basic, 180,000 on Pro, and 360,000 on Ultra. Only the Ultra card states the upfront total (360,000 words upfront); annual Basic and Pro still show the same monthly word line as the monthly toggle (5,000 and 15,000), but the account is credited with 12 × that amount when the annual plan starts.

What to do next

• Compare the plans on the pricing page.
• Create an account at signup for the 300-credit free pool (no card).
• Humanize at AI Humanizer and check a draft at AI Detector. Detection in the web editor does not spend paid-plan credits.

If a screenshot, invoice, or in-app balance disagrees with this page, trust the live pricing page for list prices and the in-app credit balance for what you can spend today.