Interactive Brokers vs Webull for day trading

Interactive Brokers vs Webull is a common question for small-cap day traders, because the two look alike on paper and work very differently underneath. Both trade from 04:00 ET, both have a desktop platform with hotkeys, a price ladder and Level 2, and both offer an API. They differ in the cost model, the routing, the data bill and the rules for small margin accounts.

We build a trading tool on the IBKR API, so read this with that in mind: we say plainly below where Webull is the better choice. Fees, hours, routing data and features were checked on October 22, 2026, on each broker's own pages and in their Rule 606 reports. Scalpel is independent and not affiliated with or endorsed by Interactive Brokers or Webull.

Interactive Brokers vs Webull at a glance

IBKR's numbers come from its stock commissions page and market data pricing. Webull's come from its fee schedule and its market data help page.

Commissions: $0 against per share

On the fee schedule, Webull wins outright. It "does not charge commissions for trading stocks, ETFs and options listed on U.S. exchanges," and passes through only the regulatory fees. IBKR Pro charges per share: Fixed is $0.005 with a $1.00 minimum per order, and Tiered starts at $0.0035 for the first 300,000 shares a month, plus exchange, clearing and regulatory fees. Fixed also caps an order at 1% of trade value, which matters on sub-dollar stocks.

A worked month for a scalper. You trade ABCD around $4.00, 1,000 shares a side, 10 round trips a day for 20 days: 400 orders and 400,000 shares.

Regulatory fees are the same at both brokers: the SEC fee on sales is listed at $0.0000206 times the sale value at each, about 8 cents on a $4,000 sale. So on commission alone, this trader pays IBKR somewhere between $1,250 and $2,000 a month more. For many traders that settles it. IBKR's own $0 plan, and why it does not suit this trader, is covered in IBKR Pro vs Lite.

Order routing and payment for order flow

The $0 is paid for somewhere. Webull's fee schedule says so directly: it makes money from "stock loans, interest on free credit balances, margin interest and payment for order flow."

Every US broker publishes a quarterly Rule 606 report on where it sends orders. Webull's report for the second quarter of 2026 shows:

• In April 2026, 30.24% of Webull's non-directed orders in stocks outside the S&P 500 went to Citadel Securities, 22.64% to Virtu and 22.25% to Jane Street.
• Wholesalers pay Webull "13% of the spread between the National Best Bid and National Best offer" on market and marketable limit orders in regular hours, and "up to $0.0026 per share" on marketable orders priced at $1.00 or more in extended hours.

IBKR's Q2 2026 report says that for IBKR Pro order flow sent to those same market makers, IBKR "has no payment for order flow, profit sharing, or fee or payment arrangement." Its Lite plan is different: market makers pay IBKR 12% of the quoted spread on marketable Lite orders, and IBKR's report states the trade-off itself: "A potential effect of these payments is reduced price improvement on executions received by IBKR-LITE clients."

Payment for order flow is not a fee on your statement, and a wholesaler can still fill you at or better than the NBBO. The question is how much better. A study of 85,000 simultaneous market orders across five US brokers found round-trip execution costs ranging from 0.07% to 0.46% of the trade, excluding commissions, for the same orders at the same moment (Schwarz, Barber, Huang, Jorion and Odean, Journal of Finance, 2025). On a $4,000 round trip, that range is $2.80 to $18.40. Its data were collected before the paper first appeared in 2022 and it measured market orders only, so treat it as a reason to measure your own fills, not as a verdict on Webull or IBKR today.

Routing control is the other half. IBKR Pro routes with SmartRouting by default and lets you send an order to a named exchange instead; we found no option on Webull to choose the destination of a stock order. If you scalp thin small caps and want to post on ARCA or take a specific book, that matters. IBKR's own video shows a directed order set up in TWS Mosaic in under three minutes.

Watch2:40

Pre-market and overnight trading

For small caps, where most of the move can happen before the open, both brokers are good. Webull's overnight trading page lists its sessions: pre-market 4:00 AM to 9:30 AM ET, after hours to 8:00 PM, and an overnight session from 8:00 PM to 4:00 AM ET for select stocks and ETFs. Overnight, Webull allows limit orders only, no shorting, no margin and day orders only.

IBKR's overnight trading page lists more than 10,000 US stocks and ETFs in its overnight session, 8:00 PM to 3:50 AM ET, with a 10-minute break before the 04:00 pre-market. Outside regular hours, exchanges accept limit orders only at either broker.

One catch on IBKR's side: on Lite, outside-regular-hours, auction and sub-dollar trades are free only while they stay at or under 10% of your monthly US share volume. Past that, IBKR charges the lesser of $0.005 a share or 1% of trade value on those trades. A pre-market-first trader on Lite will cross that line, and Webull has no such threshold.

Level 2 and market data

Here Webull is plainly cheaper, by a wide margin.

Two details. Webull's TotalView shows the best 50 bids and offers. And IBKR asks for at least $500 of equity to keep any market data subscription. An active IBKR Pro trader nearly always earns the $10 waiver, so the real gap is about $8 a month: small next to commissions, but real. Which IBKR feeds a scalper needs is in IBKR market data for day trading.

Hotkeys and the platforms

Both desktop platforms run on Windows, Mac and Linux, and both have hotkeys, a price ladder and chart trading.

Webull Desktop. Webull's desktop page lists a depth-based Price Ladder, a TurboTrader panel, hotkeys and chart trading. Its hotkey guide puts trading keys under the gear icon, then Hot Keys, then Hotkeys Settings in the Trade section: you pick a base key such as Ctrl, Shift or Alt, assign actions to combinations, and holding the base key shows a menu of your keys. The guide does not say whether a key can price a limit off the ask plus an offset with extended hours set, which is what a pre-market scalper needs, so test that in paper trading before you rely on it.

TWS. IBKR's Trader Workstation is larger and harder to learn, but its hotkeys can do exactly that: a buy key priced at the ask plus a few cents, flagged to fill outside regular hours, transmitted with no confirmation. If the TWS screen itself is the problem, Scalpel vs TWS shows what a focused front end changes.

Short selling and locates

Both brokers let you short from a margin account. Webull's short selling page asks for at least $2,000 of margin equity and adds a rule that bites on small caps: short positions carry a maintenance requirement with a minimum of $5 per share. Short 1,000 shares of a $3 stock and the requirement is at least $5,000, more than the $3,000 position itself. IBKR publishes its borrow availability and fees on its short sale cost page with a real-time availability search, so you can check a stock's borrow before the trade.

Scalpel itself never shorts, so this row only matters for what you do in the broker's own platform.

Day trading rules on a small account

FINRA replaced the pattern day trader rule on June 4, 2026, but lets firms phase the change in until October 20, 2027 (FINRA Regulatory Notice 26-10). The brokers are at different points.

Webull's day trading rules page, checked on October 22, 2026, still describes the old limits for margin accounts under $25,000: three day trades in a rolling five business days, then a PDT flag. It says Webull will share more on when it implements the new rules. What IBKR has said about its own change, and how to see which rules your account is on, is in the PDT rule on Interactive Brokers.

APIs and third-party tools

Both brokers have an API. Webull's OpenAPI offers a Trading API (order, cancel, query) and a Market Data API to individual investors, day traders included.

IBKR's API is older and has a large set of tools built on it: trading front ends such as DAS Trader Pro (through its own IBKR link, see DAS Trader vs Interactive Brokers), charting connections, journals and Scalpel. IBKR's third-party FAQ says these need "a funded IBKR PRO account," so Lite is out. For the whole list of front ends, see day trading software for Interactive Brokers, and for TradingView in particular, trading through TradingView on Interactive Brokers.

When Webull is the better choice

• You trade small size, a few times a week. $0 commission and $2.99 Level 2 beat IBKR's per-share bill at low volume, and nothing above changes that.
• You want Level 2 cheaply. TotalView at $2.99 is a fraction of IBKR's data cost.
• You want one simple app. Webull is easier to start with than TWS.
• You want overnight trading without commission. IBKR Lite overnight trades are charged at Fixed pricing; Webull's are $0.

When Interactive Brokers is the better choice

• You trade size and often, and care about fills. IBKR Pro takes no payment for your order flow and lets you choose the route.
• You trade the pre-market every day. Same hours as Webull, plus a more configurable hotkey system for limit orders outside regular hours.
• You want third-party tools. DAS, Scalpel and most API tools connect to IBKR Pro, not to Webull.
• You trade more than US stocks. IBKR's commission pages cover stock markets across North America, Europe and Asia Pacific from one account.

The checklist in the best broker for day trading small caps weighs these for your own style, and Interactive Brokers vs Schwab covers the third common option.

Where Scalpel fits

Scalpel runs only on Interactive Brokers. It connects to your own IBKR Pro account through TWS or IB Gateway with the API enabled, and gives you a keyboard-first desk for long-only small-cap scalping: a Level 2 montage, tape, chart and order bar per symbol, buys sized by risk, and stops it watches itself that can exit in the pre-market (connect Interactive Brokers). If you choose Webull, Scalpel is not for you.

Scalpel's SIM mode prices every paper fill with the IBKR plan you pick, so you can see what your own trading would cost on Tiered or Fixed (commissions in Scalpel).

Settings

ConnectionTradingStopsRiskSizingAppearanceAudioHotkeysIntelAbout

Risk kill-switch (blocks order flow)

SIM start ($)25000SIM slippage (c)0

SIM commission (per-share)

Commission planIBKR Pro TieredIBKR Pro TieredIBKR Pro FixedIBKR LiteCustom

Comm $/share0.0035Comm min ($)0.35

Comm cap (% of trade)1.0

Kill-switch caps

Fat-finger ($)250000Max position ($)250000

Daily loss ($)1000Auto-flatten on daily loss

Reset SIM account

SIM slippage makes fills pessimistic by N cents per share (buys higher, sells lower). 0 = frictionless fills at the book price.

CancelApply

Our two-minute getting started video shows the connection and the first desk.

Watch1:56

Scalpel cannot short, its stops are watched by the app rather than resting at IBKR, and they only work while it runs with a live feed (why Scalpel is long only).

Trading carries a significant risk of loss. Nothing here is financial advice.

Questions

Is Interactive Brokers or Webull better for day trading?

For a high-volume scalper who wants routing control and third-party tools, IBKR Pro. For a small, occasional trader, Webull is cheaper: $0 commission and $2.99 Level 2. Both trade the pre-market from 04:00 ET.

Does Webull sell your order flow?

Yes. Webull says payment for order flow is one of its revenue sources, and its Q2 2026 Rule 606 report shows wholesalers paying 13% of the spread on marketable orders in regular hours. IBKR takes no such payment for IBKR Pro orders.

How much is Level 2 on Webull compared with IBKR?

As checked on October 22, 2026, Webull charges $2.99 a month for Nasdaq TotalView for non-professionals. IBKR charges $16.50 for TotalView on top of about $14.50 of level 1 data, with $10 of that waived in a month with $30 of commissions.

Can you trade pre-market on Webull and Interactive Brokers?

Yes. Both run a pre-market session from 04:00 to 09:30 ET and an overnight session for selected stocks. Outside regular hours both accept limit orders only.

Does Webull still have the pattern day trader rule?

As of October 22, 2026, Webull's help page still describes the three day trades in five days limit for margin accounts under $25,000 and says it will share when it implements FINRA's new rules. Firms have until October 20, 2027 to switch.

Can I use Scalpel with Webull?

No. Scalpel only connects to Interactive Brokers, through TWS or IB Gateway, and needs an IBKR Pro account because IBKR does not offer its API on Lite.