TapeSurf vs OpenMarket vs AGGR: order flow in a browser tab

Two of them chart the book, and one charts the tape

All three run in a browser, all three are bought by a trader who reads order flow, and none is a desktop terminal. They do not draw the same thing.

• TapeSurf is the book. Its core widget is an order-book heatmap with footprint volumes on the candles. Its homepage puts the job in one line: "A heatmap alone can't tell a pulled wall from a filled one. The footprint can."
• OpenMarket is the book and a great deal more: footprint, heatmaps, cumulative volume delta, TPO, liquidation maps and an options suite built from Deribit's board, mostly aggregable across exchanges.
• AGGR is the tape. It merges live trades and liquidations from every exchange you tick into one chart, with buy and sell volume, trade counts and liquidations kept per side. It draws no order book at all, and carries no funding and no open interest.

Two of the three do not trade. OpenMarket does, on Hyperliquid. That is covered below, because it is also how OpenMarket earns.

What the free plan buys

The template above prints three free tiers. They are free in very different amounts:

• OpenMarket Free is the whole chart on every venue. The help centre says Free "gets every exchange, every chart type, and the same live feeds Plus users see". What it limits is how much runs at once: three data-indicator slots shared by a layout, 200 price alerts and 5 indicator alerts, ten workspaces, reduced order-book depth on heatmaps, and no 1-second candles. A footprint and a heatmap take two of the three slots.
• TapeSurf Free is a demonstration. You get one layout, every indicator and 2,500 bars. The order book, aggregated book, heatmap, tape and Hyperliquid levels are "limited to major spot markets", which the pricing page's structured data names as ETH and DOGE spot. Derivatives need Pro.
• AGGR is free and has nothing to upgrade to. It is GPL-3.0, needs no account, sells nothing and holds no paywall in its source.

So a live order-book heatmap on a BTC perpetual costs nothing on OpenMarket and 35 dollars a month on TapeSurf. On AGGR it does not exist. The comparison stops being simple the day OpenMarket's three slots run out or its reduced book depth matters. TapeSurf's price is published: 35 a month, or 299 a year shown as 25. OpenMarket Plus's is not. The help centre sends you to an in-app plans page that this catalogue has not read. That makes the paid comparison one you can only finish yourself, from inside the app.

Three meanings of "history"

This is the difference the free tiers hide, and it decides which chart can show you last month's move.

• TapeSurf has no backfill. It records order-book updates, trades, liquidations, funding and open interest from each venue, and its homepage says "history starts when recording of a market began; nothing before that is backfilled". Pro buys "full chart history", but for a market listed last month, full history is a month.
• OpenMarket meters history by plan. The help centre says only that Plus "extends the lookback". The MCP server's documentation is the one place with figures: 719 hours of candles on Free, just under 30 days, and 364 days on Plus.
• AGGR's public server goes back to 2021. For the 769 markets the project's instance records, daily bars run back to 1 January 2021, through an unauthenticated API. Everything else is live only, unless you run your own server, which starts recording the day you start it.

None of the three cards records how far back the heatmap itself goes, as opposed to the candles. A heatmap is the book sampled over time, and only the vendor that recorded the book can replay it.

Hyperliquid, where liquidations stop being estimates

Hyperliquid publishes positions, liquidation prices and resting take-profit and stop-loss orders on its chain, and the three tools use that very differently.

TapeSurf draws them as levels. Free shows them on spot markets only, and Pro on every market. Its homepage is the plainest statement of the limit anywhere in this category. Maps built only from public centralised-exchange data "are estimates", because those venues publish none of this.

AGGR records zero. Its Hyperliquid adapter subscribes to the trades channel and nothing else. Daily bars for the week to 21 September 2026 show substantial liquidation volume on Binance futures and Bybit and none on Hyperliquid. The zero is not a market fact. It means the adapter never asked.

OpenMarket has a Hyperliquid address overlay on Plus, and it is the one of the three where you can trade the venue.

The order ticket, and who sits between you and the exchange

OpenMarket trades Hyperliquid perpetuals from the chart, by its terms last updated 28 September 2026. A trading key your wallet authorises is generated in the browser, can trade but not withdraw, and expires within 180 days. Each order carries a builder fee of 0.02% of notional, which goes to OpenMarket. Its help centre adds Binance and Bybit to the venues. Its MCP server can place orders through your open tab when you grant the trade scope.

TapeSurf has no order entry and asks for no keys. It is hosted, behind an account, and you read what it recorded.

AGGR is your own browser talking to each exchange. Every adapter opens the venue's public websocket from your tab, and nothing in the code issues or stores a key. Instrument lists go through the project's proxy, and the hosted build loads Google Tag Manager. A self-hosted copy removes the project from the path, once you point it at your own proxy and delete those lines.

The venue lists are 13 on TapeSurf's plan matrix (12 on its homepage), 29 on OpenMarket by its homepage, and 25 live feeds on AGGR. BitMEX ceased trading on 23 September 2026 and still sits in the lists of AGGR and OpenMarket's API.

Which one, and when

Start on OpenMarket Free if you want a footprint and a heatmap on any major venue and do not want to pay. It is the only one of the three where that costs nothing. Stay there until a layout needs a fourth data indicator, or the reduced book depth hides the level you trade. At that point open the in-app plans page and set Plus's price against TapeSurf's 35 dollars, because nobody has published the first number.

Take TapeSurf Pro if your venue is Hyperliquid and you want its real positions and liquidation prices drawn on the chart, or you want a paid plan whose price you know before signing in. Accept that history on any market is only as old as TapeSurf's recording of it. Try the free plan on ETH or DOGE spot first, because that is all it shows.

Take AGGR if what you read is the merged tape: aggressive buying and selling and liquidations across twenty-odd exchanges at once, with no account, nothing sent to a vendor and daily bars back to 2021 on the markets its server keeps. Keep one of the other two open beside it, because AGGR will never show you the book. It also cannot see a Hyperliquid liquidation.