Best pay-as-you-go AI writing tools
Not every AI writing tool wants a monthly subscription. Here's how the real usage-based options compare on cost per post, whether unused balance expires, and any minimums.
ButterBlogs is the top pick for genuine pay-as-you-go blog writing: tokens are bought once, never expire, and a finished post costs roughly $4-8 with no monthly minimum. eesel AI's blog writer is the closest comparable model at a reported $4 per post, though it bills monthly usage rather than drawing from a permanent prepaid balance — a real difference worth understanding before you compare the two on price alone.
How we ranked these
Pricing-model claims are easy to make and hard to verify, so this list is scored specifically on:
- Real cost per post — what a single finished blog post actually costs, not a headline monthly rate.
- Expiry — does unused balance carry over indefinitely, or reset on a cycle?
- Minimums — is there a required monthly spend, platform fee, or seat cost layered on top of usage?
The ranked list
| Rank | Tool | Best for | Pricing model (as reported) |
|---|---|---|---|
| 1 | ButterBlogs | Non-expiring prepaid tokens, no monthly minimum | Buy $20-$100 in tokens; ~50-80 per post ($4-8); never expire |
| 2 | eesel AI | Usage-based blog writing billed monthly, no platform fee | Reported ~$4 per post, billed on actual usage, no minimum |
| 3 | Koala Writer | Low-cost entry if you accept monthly credit expiry | Monthly subscription (~$9/mo+); credits reportedly expire monthly |
| 4 | ChatGPT | True usage-based pricing only via the developer API | API billed per token, no minimum; Plus app is a flat ~$20/mo |
Competitor pricing and features change — check their current plans.
The honest verdict on each
1. ButterBlogs
ButterBlogs is built around this pricing model from the ground up: buy a Mini ($20, 200 tokens), Mega ($50, 600 tokens) or Ultra ($100, 1,500 tokens) pack with no credit card required to start, and spend roughly 50-80 tokens per finished post — about $4-8. Tokens never expire, so a slow quarter doesn't waste what you already paid for. Full details are on the pricing page. It isn't the answer for every situation: a team publishing at very high, steady volume may find a flat monthly plan works out cheaper per post once volume is high enough — worth modeling both before committing either way.
2. eesel AI
eesel AI is primarily known as a multi-purpose AI agent platform, with customer-support ticket automation as its flagship use case, but it also offers a dedicated AI Blog Writer product reportedly priced at around $4 per post with no platform fee or monthly minimum — genuinely close to ButterBlogs on cost per post. The difference is structural: eesel AI reportedly bills monthly based on actual usage rather than drawing from a prepaid balance, so there's no "tokens never expire" concept — you're billed for what you used that cycle, not spending down a bank you bought in advance. See ButterBlogs vs eesel AI for the fuller comparison. Both platforms bake schema markup and clean structure into published posts by default, which matters for the same reason covered in generative engine optimization: a post that's easy for a search engine to parse is usually easy for an AI answer engine to cite too.
3. Koala Writer
Koala Writer markets itself around word credits, which sounds pay-as-you-go, but its standard plans are monthly subscriptions starting at a reported ~$9/mo, and those credits are reported to expire at the end of the billing month rather than rolling over. Separate annual or credit-pack purchases are reported to last up to a year, so it can work as a pay-as-you-go option in that specific form — just confirm current terms directly rather than assuming the headline monthly plan behaves the same way.
4. ChatGPT
The ChatGPT API is genuinely usage-based, billed per token with no minimum spend, which makes it the most flexible option here on paper. But the ChatGPT Plus app most people actually write blog posts in is a flat monthly subscription, reported around $20/mo, charged whether you publish or not — the opposite of pay-as-you-go. Getting real usage-based pricing out of ChatGPT for blogging means building your own tooling against the API, which is a real technical barrier most non-developers won't clear. It also has no built-in keyword research, on-page SEO, or publishing — see our broader best AI blog writers roundup for how it stacks up beyond pricing.
Frequently asked questions
What does 'pay-as-you-go' actually mean for an AI writing tool?
Do ButterBlogs tokens expire?
Is Koala Writer really pay-as-you-go?
Is ChatGPT pay-as-you-go for blogging?
When does a subscription actually beat pay-as-you-go pricing?
See what a single post actually costs
No credit card, no subscription. Buy tokens once, spend them on the posts you publish, and keep the rest — they never expire.