We measured market depth across 500 AFL pricing rows covering 245 fixtures and 11 bookmakers. One operator offered 861 markets on a single game. Another offered one. The gap between the deepest and thinnest AFL card is roughly 800 markets, and it changes what you can actually bet.
A head-to-head between the two AU-focused odds APIs. Bookmaker depth, racing coverage, Betfair Exchange, closing-line archive, streaming, webhooks and what each actually costs.
Most of the value available to an Australian punter costs nothing. That is an uncomfortable claim for an industry built on subscriptions, but the arithmetic supports it: the largest recoverable gains come from taking the best price, avoiding compounded margin, converting bonuses properly, and tracking your own results — and every one of those is available free.
This is a guide to the free tooling that genuinely moves the number, what each one is for, and where the free tier stops being enough.
| Tool | What it recovers | Effort | Free? |
|---|---|---|---|
| Odds comparison | 1.5–2% of sports turnover, 4–7% of racing turnover | Seconds per bet | Yes |
| Bonus bet converter | 60–80% of bonus face value | Minutes per bonus | Yes |
| De-vig calculator | Tells you whether a price is actually value | Seconds | Yes |
| EV calculator | Turns a hunch into a decision rule | Seconds | Yes |
| Kelly calculator | Variance control, not extra EV | Once, then apply | Yes |
| Bet tracker | The only honest read on whether you are winning | A minute per bet | Free tier |
| Arbitrage scanner | 1–5% per opportunity taken | High — needs accounts and speed | Limited free tier |
| Odds API | Everything, if you build | Highest | Free tier |
The single highest-value free tool, and the one most punters skip because it feels like admin rather than strategy.
The Australian market is genuinely dispersed. On a head-to-head the gap between best and worst available price averages 3-4%; on a thoroughbred win market it is often 8-15%. Which book leads rotates constantly, so there is no shortcut of "just use the good one".
How to use it well: keep it open in a tab while you bet, check every single time, and weight your attention toward racing and props where dispersion is widest. Watch the book percentage as well as the best price — if the best available prices sum below 100% you have an arbitrage, and between 100-102% you have a low hold, which is a far better bet than any single book's price.
The Krok Odds comparison screen covers 140+ brands across sport and all three racing codes with capture timestamps, free.
Small, boring, and each solves a specific problem that punters routinely get wrong by hand.
| Calculator | Question it answers | Common mistake it prevents |
|---|---|---|
| Arbitrage | Stake split for a guaranteed profit | Forgetting exchange commission |
| De-vig | What the bookmaker really thinks the probability is | Comparing your estimate to a vigged price |
| Expected value | Is this bet worth placing at all | Confusing a likely winner with a good price |
| Kelly | How much to stake given an edge | Full Kelly, which produces brutal drawdowns |
| Hedge | Locking in profit on a live position | Hedging at a price that guarantees a loss |
| Dutching | Backing several runners for equal return | Uneven stakes producing an unintended position |
| Bonus converter | Turning a bonus into cash | Treating a bonus bet as if stake were returned |
| Odds converter | Decimal, fractional, American, implied probability | Mis-reading an American line as a decimal price |
| Parlay | Combined odds and true margin of a multi | Not seeing how margin compounds across legs |
| SGM | What a same-game multi should cost | Assuming legs are independent |
The parlay calculator is worth using once even if you never use it again, purely to see the margin compounding. Four legs at 5% margin each is 18.5% total margin — the calculator makes that visible in a way that reading about it does not.
The most common calculator error in the wild. If you are laying on Betfair at 6.5% commission, your effective lay price is worse than displayed, and a hedge or bonus conversion that looks marginally profitable before commission is frequently a small loss after it. Any calculator without a commission field is going to mislead you on exchange positions.
Australian bookmakers issue a lot of bonus bets, and most punters destroy the value by punting them on short-priced favourites.
| What you do with a $50 bonus bet | Expected cash value |
|---|---|
| Bet it on a $1.40 favourite | ~$14 |
| Bet it on a $3.00 chance | ~$30 |
| Bet it on a $15 longshot | ~$40 but with enormous variance |
| Convert via exchange lay at ~$6-8 | ~$36–$40 guaranteed |
The mechanics: back the bonus on a longer-priced selection, lay the same selection on the exchange for an amount calculated to leave you equal profit either way. Because the bonus stake is not returned, the optimal back price sits higher than intuition suggests — typically $5-$9 depending on commission.
Two rules that matter. Read the terms before you plan the conversion, because minimum-odds conditions and eligible-market restrictions vary. And do not convert every bonus at the same book in the same pattern, because the behaviour is trivially detectable.
The tool that tells you whether any of the above is working. Most punters overestimate their results by a factor of two or three, because wins are memorable and losses are not, and bonus bets blur the boundary between stake and gift.
What to record: date and time of placement, sport, market, selection, the price you took, the bookmaker, the stake, and the result. The price and timestamp are the two fields people skip and the two that make closing line value computable later.
A spreadsheet is fine to start. The advantage of a dedicated tracker is that it will match your bets against captured closing lines automatically — the Krok Odds tracker settles racing bets against Betfair starting price, which is the sharpest closing reference available in Australian racing.
Free is not a trick, but it does have edges. The usual constraints:
None of those matter until your process is already working. A punter without a tracked record does not need faster alerts; they need a tracked record.
That stack costs nothing, takes about two minutes per bet, and improves a typical punter's expected result by several percent of turnover. It is not exciting. It is the part that works.
Every tool referenced above is on the Krok Odds free tools page, and the comparison and tracking tiers are free to use without a card.
Arbitrage, de-vig, EV, Kelly, hedge, dutching, bonus conversion and more — plus live odds comparison across 140+ Australian bookmakers. No card required.
Open the free tools →
David has been running advantage betting strategies across Australian bookmakers since 2023 and contributes long-form retrospectives, case studies, and operational pieces drawn from years of running real bets in AU markets. His writing focuses on the realities of running a sustainable AU advantage operation — what works, what fails, and the operational details most blogs gloss over.
