Superhuman vs AIWriteBook
Plans, free access, limits and intended use side by side, taken from each vendor’s own pages. No score and no winner: the facts show where the two differ.
Change tools
AI email app, agent assistant and workspace from the company that now includes Grammarly
Plan, write, edit, format and publish a book with AI, with a cover and audiobook on higher plans
- Free access
- Superhuman: Free access
- AIWriteBook: Free access
- Paid from
- Superhuman: USD 12 per member a month billed annually; $15 billed monthly
- AIWriteBook: USD 20 per month
- Plans listed
- Superhuman: 5
- AIWriteBook: 5
- Public API
- Superhuman: Not confirmed
- AIWriteBook: Not confirmed
Where Superhuman and AIWriteBook differ
On the listed facts these two look alike. The plans, limits and screenshots below show where the details part ways.
Head to head
Each value from the tool’s profile and the vendor’s own pages
| Superhuman | Fact | AIWriteBook |
|---|---|---|
| Access and price | ||
| Free access availableFree · USD 0 | Free accessSame | Free access availableFree · USD 0 |
| USD 12 per member a month billed annually; $15 billed monthlyPro | Lowest listed paid plan | USD 20 per monthPlus · or $12 per month billed yearly · $144 a year |
| Free plan without Mail; Mail from $25 a member a month; Business $33 | Pricing model | Free plan (100 credits); paid from $12 a month billed yearly |
| 5 | Plans listedSame | 5 |
| Not confirmed | Public API | Not confirmed |
| Not confirmed | Card to start | Not confirmed |
| Not confirmed | Open source | Not confirmed |
| What it is for | ||
| Teams that live in Gmail or Outlook and will pay per seat to triage email faster, or individuals who want a free AI assistant across apps | Built for | Self-publishing authors, ghostwriters and non-fiction writers who want one place to outline, draft in their own style, edit and prepare a book for Amazon KDP |
| Writing & content | CategorySame | Writing & content |
| Platforms |
|
| Works with |
|
| How current | ||
| Profile sources checked | ||
| Prices confirmed · Oct 6, 2026 | Pricing checkSame | Prices confirmed · Oct 17, 2026 |
Official source check for both tools. No hands-on testing and no score: “Differs” marks a documented difference, not a better tool.
Plans and prices
Superhuman
Prices confirmed · Oct 6, 2026- FreeUSD 0
- ProUSD 12 per member a month billed annually; $15 billed monthly
- Mail StarterUSD 25 per member a month billed annually
- BusinessUSD 33 per member a month billed annually; $40 billed monthly
- EnterpriseCustom; contact sales
AIWriteBook
Prices confirmed · Oct 17, 2026- FreeUSD 0
- PlusUSD 20 per monthor $12 per month billed yearly · $144 a year
- ProUSD 50 per monthor $30 per month billed yearly · $360 a year
- UltraUSD 200 per monthor $120 per month billed yearly
- One-time creditsUSD 20 for 250 creditsor $50 for 2,000 credits
Strengths and limits
Superhuman
Strengths
- Mail is built around speed on Gmail and Outlook: The Mail page lists triage, follow-up reminders, Snippets, shortcuts and team comments in one app rather than as add-ons.
- A real free entry point: The plans page lists Free at $0 with chat across apps, writing help in 20+ languages and collaborative Docs.
- Business adds CRM views: The plans page says Business shows and updates HubSpot, Salesforce and Pipedrive records from the inbox.
Limits to plan around
- Free does not include Mail: On the plans page Mail is marked on Business and Enterprise only, so the email app is not part of the $0 or Pro plans.
- Two pages describe the Business price differently: The Mail pricing page says Business is $33 with 15% off for teams of 5+; the plans page shows $33 billed annually and $40 monthly without that note.
- Mail trial terms were not found: The pages read do not state whether Mail has a free trial, its length or what happens after it.
AIWriteBook
Strengths
- Free plan with no card: The pricing FAQ says you can plan a full book and get a first chapter free, with no credit card required.
- Content stays yours: The terms say you keep ownership and commercial rights to what you create, and the privacy policy says your content is not used to train its models or by its AI providers.
- Credit costs are published: The terms list per-action credit costs, so you can estimate a book before paying.
Limits to plan around
- Pages disagree on credit expiry: The pricing FAQ says unused subscription credits expire after a month, while the terms say Pro credits roll over for up to 3 months.
- Audiobooks are credit-heavy: At the terms' rate a 2,000-word chapter costs about 880 credits, so a full audiobook can outrun a plan's monthly allowance.
- Refunds are narrow: The terms allow a refund only within 7 days of the first subscription purchase and with under 50% of credits used; renewals and one-time credit packs are non-refundable.
See both products
Start from your task, not from a winner.
Run both tools on the same real task, then compare the result, how much editing it needs and how fast it uses your plan’s allowance.
How we reviewChange this pair
Choose tools
Choose two tools below. You can replace either selection at any time.
Audio & voice
Automation
Coding
Data & spreadsheets
Images & design
Presentations
Research & sources
Video & editing
Website builders
Writing & content
Comparing tools from different categories is fine, and often useful — a writing assistant and a research tool solve different halves of the same job. The table will show you exactly where they diverge.
Questions about comparing tools
How does the comparison work?
Add two tools to the comparison tray from any tool card, then open this page. The table pulls each tool's verified plan details, platforms, strengths and limits from its profile, so both columns carry the same kind of evidence, with a separate source-check date for each tool.
Do you declare a winner?
No. The table sets two tools against each other on documented facts, not on a score. Which one wins depends on your task, your budget and your usage volume — three things we cannot see from here.
Why are some cells empty or marked unverified?
Because we could not confirm that detail on the vendor's own pages. Rather than filling the gap with a figure from elsewhere, we mark it and say why on the tool's profile.
Can I compare more than two tools?
Not at once. Two columns keep the differences readable and force a real decision. Remove either selected tool to replace it, or clear both to start a new pair.
Every figure in the table above comes from the linked profile, where the source and the verification date are listed. Browse all tools or read the editorial policy.