Last reviewed by Robert Prime — July 2026. Ad platform mechanics and typical click prices change; confirm current details in the BookBub Partners and Amazon Ads consoles before you budget.
Short answer: In the Amazon Ads vs BookBub Ads decision, spend on Amazon Ads first if your book sells mainly on Kindle and you want the simplest, cheapest place to learn — they're cost-per-click search ads that reach readers at the point of purchase, and Amazon shows your sales natively. Add BookBub Ads when you want to target the readers of specific comparable authors (something Amazon can't do directly), reach US, UK, Canadian and Australian audiences in one campaign, or amplify a launch or series funnel. They aren't rivals so much as two different jobs: Amazon captures existing demand at the buy button; BookBub creates demand inside a defined reader audience. For most indies the right move is Amazon first, BookBub second — not either/or.
I've run advertising across marketplaces for over 25 years in e-commerce and self-published my own book, so this comes from running Amazon budgets myself and working with UK authors on BookBub — not recycled advice. Here's how to decide where each pound goes.
Key Takeaways
- Amazon = intent at the buy button. BookBub = a targeted reader audience. Amazon reaches active shoppers searching or browsing; BookBub reaches subscribers reading a curated email who weren't shopping yet.
- Both charge on a bid/auction basis. Amazon Sponsored Products are cost-per-click; BookBub Ads let you bid CPC or CPM (Amazon Ads, BookBub).
- The single biggest difference is targeting. Amazon targets keywords and competing products (ASINs); BookBub targets followers of comparable authors — the standout feature Amazon has no direct equivalent for.
- Amazon sees your sales; that's why it's easier to learn on. Sales and ACoS appear in the console. On BookBub you judge success by what happens on the retailer page afterwards.
- BookBub wins for multi-country reach and audience targeting; Amazon wins for tight budgets, KU page-read attribution, and keyword-driven niches.
- Don't fabricate a "winner". There is no universal ROI figure that says one beats the other — it depends on your book, genre, distribution and goal.
The Core Difference: Intent vs Audience
Everything else flows from one distinction.
Amazon Ads reach people who are already shopping. When a reader searches "cosy mystery" or looks at a comparable title, your Sponsored Products ad appears in those results or on that product page. They're in a buying mindset and your book meets them there. You choose the trigger — a keyword or a competing book (ASIN) — and Amazon matches your ad to shoppers' search terms and the products they browse (Amazon Ads). That's intent: you capture demand that already exists at the exact moment of purchase.
BookBub Ads reach a defined reader audience before they're shopping. BookBub shows image ads to its email subscribers (and on its site), and its defining feature is that you can target the followers of specific authors. Writing cosy mysteries? You can point ads at readers who follow authors comparable to yours, rather than guessing keywords (BookBub). That's audience: you introduce your book to engaged readers of a known type, creating demand rather than only capturing it.
Neither is "better" in the abstract. Intent is easier to convert but capped by how many people are actively searching for your kind of book. Audience targeting can reach readers who'd never have searched for you, but they weren't in buying mode when your cover appeared. Which suits you depends on your goal and your budget.
Amazon Ads vs BookBub Ads at a Glance
| Amazon Ads | BookBub Ads | |
|---|---|---|
| Targeting model | Keywords + rival books (ASINs) | Author followers + category/country |
| Cost model | Cost-per-click, auction | Auction; CPC or CPM |
| Reader mindset | Actively shopping (high intent) | Reading a curated email |
| Best for | Kindle/KU, keyword niches, tight budgets | Author audiences, launches, wide reach |
| Control & feedback | Sales + ACoS shown natively | You set bid/audience; judge by sales |
| Where it sells | Amazon only | Any retailer link |
The two things to read out of that table: Amazon's trigger is a keyword or a competing book, while BookBub's is a reader audience (chiefly author followers). And Amazon reports your sales in the console, whereas on BookBub you own the bid, audience and creative but read success from what happens on the retailer page. Mechanics here are sourced to Amazon Ads and BookBub Partners; for the deep dives see Amazon Ads for authors and BookBub Ads (CPC).
How Each One Charges You
Both platforms run an auction, but you buy slightly different things.
Amazon Sponsored Products — cost-per-click. You bid the maximum you're willing to pay when a shopper clicks your ad. The final click price is set by an auction based on your adjusted bid plus other factors, so competitive bids win better placements but you rarely pay your full max. There are no monthly or upfront fees — you set a daily budget and pay only for clicks (Amazon Ads). Because the sale happens on Amazon, the console reports your sales and ACoS directly.
BookBub Ads — CPC or CPM, your choice. BookBub also runs an auction: when a reader opens an email, it compares every live campaign targeting that reader and shows the highest-value ad, with click-through rate factored in (BookBub). You can bid CPM (pay per 1,000 impressions — good once you know an ad performs) or CPC (pay only when a reader clicks — the budget-friendlier default while you're testing). BookBub itself frames CPC as the way to stretch a modest budget, because you only pay for readers who engage (BookBub).
On what a click costs, treat any figure as directional — click prices move by genre, targeting and season. As observed ranges to sanity-check your own account against (not guarantees), our cluster guides put typical Amazon book CPCs around £0.20–£0.80 and typical BookBub CPCs around £0.30–£2.00 — roughly 50–150% higher per click on BookBub, because you're paying to reach a curated reader audience rather than catch an existing searcher. Confirm live figures in each console before you budget.
The honest rule: Amazon shows you exactly what your ads sold. On BookBub you set the audience and bid, then read success from what happens on the retailer page — so build the habit of tracking sales, not just clicks.
How to Decide Where Your Budget Goes
Work through these in order — it's a budget-allocation decision, not a loyalty test.
1. How much are you spending a month?
If your ad budget is tight (say under ~£100/month), start on Amazon. It's economical at low spend and you can learn your break-even on a small daily budget. BookBub generally needs enough spend to gather data before you can optimise — a starved BookBub campaign just won't teach you anything.
2. Where does your book actually sell?
Kindle- and Kindle-Unlimited-first? Amazon is where the buyers and the KU page-read attribution are. Selling wide (Apple Books, Kobo, your own store)? BookBub can drive to any retailer link, so it earns its place far sooner.
3. Can you name your comparable authors?
If you know the five to fifteen authors whose readers would love your book, BookBub's author targeting is a lever Amazon simply doesn't offer directly — that's a strong reason to add it. If you can't yet, Amazon's keyword and product targeting is the more forgiving place to start.
4. What's the campaign for — steady sales or a spike?
For always-on discovery next to the buy button, Amazon. For a launch week amplifier, a series funnel (advertise book one, earn across the series), or multi-country reach in one campaign, BookBub is built for it.
A worked allocation. On £100/month with one Kindle title, put all of it on Amazon Sponsored Products and learn your break-even before you spread it anywhere. On £300/month with a series and five named comparable authors, a common split is roughly £200 on always-on Amazon and £100 on a BookBub launch or series-funnel burst. These are starting points, not formulas — move the money towards whichever your own numbers reward.
For most new authors with one or two Kindle titles, the sequence is clear: get the listing converting, gather a handful of reviews, run Amazon Sponsored Products on a small budget to learn your numbers, then add BookBub once you have comparable authors to target, a series to funnel into, or a wide catalogue to reach. Trying to master both platforms as a debut usually means learning neither. Our Amazon Ads for authors guide walks through setup.
When Amazon Ads Win
- Your budget is tight. Amazon is economical at low spend; you can learn on a few pounds a day.
- You're in Kindle Unlimited or sell mainly Kindle ebooks. Amazon attributes KU page reads; BookBub can't.
- You want the simplest feedback loop. Sales and ACoS appear natively — the easiest place to learn what works.
- You're chasing a specific keyword or category niche. Amazon finds searchers inside it at the point of purchase.
- Your book is newer or lighter on reviews. Amazon Ads still convert (at a lower rate) where a curated-audience click may not.
When BookBub Ads Win
- You want author-audience targeting. Reaching the readers of named comparable authors is BookBub's headline strength and Amazon's blind spot.
- You publish wide or want cross-retailer reach. BookBub links can point to Amazon, Apple, Kobo, B&N or your own store.
- You want multi-country reach in one campaign. US, UK, Canadian and Australian audiences together, instead of separate per-marketplace Amazon campaigns.
- You're amplifying a launch or running a series funnel. A concentrated burst to an engaged audience pairs well with a discounted book-one price.
- Your cover is a genuine asset. BookBub ads are image-led, so a strong cover can out-compete Amazon's more text-heavy search results.
For the deeper platform-specific playbooks, see Amazon Ads for authors and BookBub Ads (CPC). If you're also weighing social advertising, Amazon Ads vs Meta Ads for authors completes the picture.
Common Mistakes and How to Avoid Them
Treating it as either/or. They do different jobs. The usual winning answer is Amazon first, BookBub added when there's a specific reason — not a permanent choice between them.
Judging BookBub on platform clicks alone. BookBub reports impressions and clicks, but your money is made on the retailer page. Track sales (and, for series, read-through) — not just the click count.
Running BookBub on too small a budget. Under-funding starves the auction of the data you need to optimise. If you can't fund a proper test yet, put the budget on Amazon instead.
Guessing keywords when you could target authors. If you know your comparable authors, BookBub's author targeting is more direct than hoping the right Amazon keyword converts. Use each platform's native strength.
Ignoring your reviews and cover. Curated-audience ads especially expect social proof and a strong cover. Ads amplify a listing that already converts; they can't rescue one that doesn't.
Frequently Asked Questions
Are Amazon Ads or BookBub Ads better for authors?
Neither is universally better — they do different jobs. Amazon Ads are cost-per-click search ads that reach readers at the buy button by keyword and competing product, and they show your sales natively, which makes them the best place to start, especially for Kindle and Kindle Unlimited authors on a tight budget. BookBub Ads are auction-based display ads (CPC or CPM) that let you target the followers of comparable authors across several countries, which Amazon can't do directly. Most successful indies run Amazon first and add BookBub for audience targeting and reach.
What's the real difference between Amazon Ads and BookBub Ads?
Targeting and timing. Amazon targets keywords and competing books to reach shoppers who are already buying (intent), and the sale happens on Amazon where the console reports it. BookBub targets reader audiences — chiefly the followers of specific authors — inside its curated emails, reaching engaged readers before they're shopping, and can send them to any retailer. Amazon captures existing demand; BookBub creates it inside a defined audience.
Where should I spend my book ad budget first?
For most authors, Amazon Ads first. It's economical at low spend, matches where most ebooks are bought, attributes Kindle Unlimited page reads, and shows sales natively so you can learn your break-even quickly. Add BookBub Ads once you can name your comparable authors, publish wide or want multi-country reach, or need a launch/series amplifier. If your budget is very small, keep it on Amazon rather than spreading it thin.
How do Amazon Ads and BookBub Ads charge you?
Both use an auction. Amazon Sponsored Products are cost-per-click: you bid the most you'll pay per click, the auction sets the actual price, there are no upfront fees, and you set a daily budget. BookBub Ads let you bid CPC or CPM (per 1,000 impressions); CPC is the budget-friendlier default while testing because you only pay for readers who click. Confirm current details in each platform's console.
Can I run both Amazon Ads and BookBub Ads at once?
Yes, and many established authors do — they're complementary. A common pattern is always-on Amazon Sponsored Products for steady, point-of-purchase sales, plus BookBub Ads in concentrated bursts for launches, series funnels or international reach. As a debut, though, it's usually better to learn one platform (Amazon) properly before adding the second, so you can actually tell what's working.
Is BookBub Ads the same as a BookBub Featured Deal?
No. A Featured Deal is a curated editorial email placement you apply and get selected for. BookBub Ads run on a separate self-serve platform with no editorial gatekeeping — you create image ads, set targeting and bids, and run them any time. This guide is about BookBub Ads, not the Featured Deal.
Running either platform profitably is a skill you can learn. The Sell More Books course gives UK authors the launch, ads and audience playbook to spend a budget where it actually returns.
Related guides
- Amazon Ads for Authors: Complete Beginner's Guide
- BookBub Ads (CPC): How They Work and When to Use Them
- Amazon Ads vs Meta Ads for Authors
External references
- Amazon Ads — Sponsored Products — cost-per-click model, auction and daily budget
- Amazon Ads — Keyword Targeting — how keyword and product targeting reach shoppers
- BookBub Ads — CPC vs CPM Bidding — the two bidding models and the auction
- BookBub Ads — Targeting Tips — author-follower and category targeting
- BookBub Partners — the self-serve BookBub Ads dashboard
About the Author
Robert Prime is a self-published author, veteran e-commerce strategist, and the founder of publishing.co.uk. With over 25 years in digital business — including running the Amazon advertising agency MrPrime.com — he has managed advertising across Amazon and audience platforms at scale. After marketing his own book, Google. Panic. Repeat., he built publishing.co.uk to help UK authors spend ad budgets where they actually return. He is co-owner of the LoveReading.co.uk network and a member of the Forbes Business Council.
