If you sell on a listing that anyone else also sells on, your price is not a decision you make once. It is a decision that gets re-made every time a competitor moves, goes out of stock, comes back, or runs a promotion. On a busy listing that can be dozens of times a day.
An Amazon repricer is the software that makes that decision for you. It watches the competing offers on your ASINs and adjusts your price within boundaries you define, so you stay competitive for the Buy Box without sitting in Seller Central refreshing offer pages.
This guide covers what repricing software actually does under the hood, the four kinds you will encounter, and the questions that matter when you choose one.
What an Amazon Repricer Actually Does
Strip away the marketing and every repricer runs the same four-step loop:
- Read the competitive landscape. Pull the current offers on each of your ASINs — competitor prices, their fulfillment method, their seller rating, and who currently holds the Buy Box.
- Apply your rule. Compare that landscape against the strategy you configured. Beat the lowest FBM offer by one cent. Match the Buy Box price. Hold at your target margin while you already own the Buy Box.
- Check the guardrails. Validate the proposed price against your floor and ceiling. A price below your floor is discarded, not sent.
- Push to Amazon. Submit the new price through the Selling Partner API.
The interesting work sits entirely in steps 2 and 3. Step 1 is a data problem every vendor has solved. Step 4 is an API call. The difference between a repricer that grows your business and one that quietly bleeds it is how carefully it decides not to change a price.
That is worth repeating, because it is counterintuitive: the most valuable thing a repricer does is refuse to lower your price. Dropping a price is easy. Knowing when dropping it costs more than the sale is worth is the hard part.
The Four Types of Repricer
Rule-based repricers
You write the rule, the software executes it. "Beat the lowest FBA offer by two cents, never below 18.40." Predictable, auditable, and easy to reason about when something looks wrong.
Rule-based repricing is where almost every seller should start. You can explain every price on your account, which matters enormously when you are diagnosing why a listing stopped selling.
Algorithmic repricers
Instead of racing to the lowest price, an algorithmic repricer tries to find the highest price that still wins the Buy Box. It uses signals beyond price — your seller metrics, fulfillment method, competitor behaviour patterns — to estimate the probability of winning at each price point.
Done well, this genuinely makes more money than a flat rule. Done badly, it is a black box you cannot audit. Ask any vendor selling "AI repricing" one question: can you show me why it chose this specific price for this specific listing? If the answer is vague, it is a rule engine with a marketing budget.
Cost-driven repricers
These start from your supplier cost rather than from your competitors. When your landed cost changes, your floor moves, and every price anchored to it moves with it.
This is the category that matters for online arbitrage and wholesale sellers, because their costs are not fixed. A supplier ends a promotion, your cost jumps 12%, and a floor calculated last month is now a floor that loses money on every sale.
Manual and spreadsheet repricing
Not software, but worth naming because it is where most sellers start and where many stay too long. It works up to roughly 20 listings with stable competition. Past that, the arithmetic defeats you: 100 listings checked twice a day is 200 decisions a day, and you will not make them all correctly.
The Floor Price Is the Whole Ballgame
Almost every horror story about repricing — "the software sold my inventory at a loss overnight" — traces back to one cause: a floor price that was wrong, or absent.
Your floor is not your purchase price. A correct floor includes:
- Landed cost — what you paid the supplier, plus inbound shipping and any prep
- Amazon's referral fee — typically 8 to 15 percent depending on category
- Fulfillment cost — FBA fees, or your actual pick-pack-and-ship cost for FBM
- Storage — monthly storage, and long-term storage if the unit ages
- A returns allowance — a category returning 8 percent needs that priced in
- Your minimum acceptable margin — the number that makes the sale worth making
Sellers routinely skip the last three and end up with a floor that is technically above cost and practically below break-even. Our FBA calculator and profit calculator exist for exactly this arithmetic, and How to Protect Your Profit Margins as an Amazon Seller walks through the full breakdown.
One more thing that catches people: your floor is not a static number. If you source from suppliers whose prices move, a floor set at listing time is stale within weeks. That is the strongest argument for connecting your repricer to live supplier data rather than to a spreadsheet you update by hand.
What to Ask Before You Buy
Does it enforce the floor before the price leaves the system, or after? Validation has to happen server-side, on every proposed price, with no path around it. Ask where the check runs.
Can you run it without it touching Amazon? A simulation or dry-run mode — where the repricer logs every decision it would have made without sending anything — is the only honest way to evaluate a strategy against your own catalogue. Repricefy defaults every new account to simulation mode for this reason; you switch to live once you have seen the decisions and agree with them.
Does it treat FBA and FBM differently? It should. The Buy Box weights fulfillment method heavily, so an FBA offer can hold the Buy Box at a higher price than an FBM offer on the same listing. A repricer that treats them identically will chase prices it never needed to chase. See FBA vs FBM Repricing.
What happens when your supplier runs out of stock? Most repricers have no answer, because they only look at Amazon. If your inventory depends on a supplier, price is half the problem — a listing that stays live after your source disappears generates cancellations, and cancellations damage your account.
Is pricing tied to listing count or to revenue? Percentage-of-revenue pricing means your repricer gets more expensive precisely when it succeeds. Flat tiers do not.
Can you see the decision history? When a listing stops selling, you need to answer "what price were we at, and why" for any moment in the past. If the tool cannot tell you, you are debugging blind.
How Repricefy Approaches It
Repricefy is a rule-based repricer with a cost-driven spine. Two things shape the design:
Supplier cost is a first-class input. We monitor supplier product pages across more than 40 retailers. When a supplier price changes, your cost basis updates and the floors derived from it move with it. When a supplier goes out of stock, we can set the MFN listing quantity to zero before an order arrives that you cannot fill — FBA quantity is Amazon's to manage.
Nothing reaches Amazon without passing the guardrails. Every price runs through a validation layer before dispatch, and every account starts in simulation mode.
You can read how the strategies differ in the help centre, or how floor and ceiling prices are enforced.
Frequently Asked Questions
What is an Amazon repricer?
An Amazon repricer is software that monitors the competing offers on your listings and automatically adjusts your price within limits you set, so you stay competitive for the Buy Box without manually watching prices all day.
Is using a repricer against Amazon's rules?
No. Repricing through the official Selling Partner API is fully supported by Amazon. What violates policy is price fixing between sellers or misleading list prices, not automation itself.
How often should a repricer update my prices?
Fast enough to react before a competitor's price change costs you the Buy Box, which in practice means minutes rather than hours. Updating more often than your competitors actually move adds no value and burns API quota.
Will a repricer lower my prices to zero?
Not if it is configured correctly. Every serious repricer enforces a floor price you define, and that floor should be calculated from your true landed cost plus fees, not guessed.
Do I need a repricer if I only have a few listings?
If your listings have no competing offers, no. The moment two or more sellers share a listing, prices move faster than manual checks can follow, and that is where a repricer pays for itself.
Repricefy's free plan includes automated repricing and supplier monitoring for up to 25 listings, with simulation mode on by default. Compare it against the alternatives or start free.