TWS versus IB Gateway for an API connection

Quick answer

TWS provides the full trading workspace. IB Gateway provides an API connection interface. Both require a broker login. Use the program your app supports and match its actual port; switching programs alone does not fix data or trading permissions.

Educational software guidance. Trading involves risk. Read the financial and information disclaimers.

Step by step

1 Identify which program your app documents and supports. Do not assume every TWS app also supports every Gateway workflow.
2 For TWS, review Global Configuration → API → Settings. For Gateway, review Configure → Settings → API → Settings.
3 Match the set host, port, and login mode in the client app.
4 Check account access and market data after connecting.
5 Keep a documented way to check broker orders and positions when diagnosing an automation problem.

A practical example

Suppose an old app profile says TWS paper on port 7497, but you now open Gateway paper. Its default port is different. Read the port in the program that is actually running and check that the app supports that program. Keep the rest of the test small. One correct account and one known quote are easier to check than a full set of charts and alerts at once.

Illustrative scenario, not a record of a trade placed during this review.

Screen reference

Start in Mosaic with File → Global Configuration. Then choose the panel named in the steps.

TWS API Settings showing socket clients, read-only access, port and logging — Find the named control in API → Settings. The displayed values belong to a paper session and are examples, not universal recommendations. Captured in TWS paper mode on 3 October 2026. Open the image for full size.

How to confirm the result The supported client should connect to the correct account and receive the details it needs.

Mistake to avoid

TWS screenshots in this library show TWS. Gateway has a different window layout even where API concepts are shared.

Common questions

Does Gateway use 7497 by default?

Its usual paper default is 4002. Read the actual set value.

Can I run both with the same username?

Concurrent trading-session rules still apply; review IBKR’s login guidance.

How to enable the TWS API for PickMyTrade TWS error 502: cannot connect to the API TWS and IB Gateway ports: paper versus live TWS error 507 or EOF: the API socket closed

Financial and information disclaimers

Financial disclaimer

These guides explain software. They are for education, not financial, investment, tax, or legal advice. No example is a suggestion to buy or sell a product or use a trading strategy. Trading can lose money, including all funds you put at risk. With margin, futures, short sales, or some options, losses can exceed your starting funds. Automation can fail, send duplicate orders, or act late. Stops do not guarantee a fill or a price. Review your orders and positions, and seek advice from a qualified professional for your own needs. Paper trades, examples, and past results do not predict live results or promise a profit.

Information disclaimer

This is general help based on the sources and check date shown on the page. Screens, settings, fees, data access, and product support can change or differ by app version, account, country, and broker. The content may contain errors or become out of date; accuracy, completeness, and continuous service are not guaranteed. Check current broker and app instructions before acting. Screenshots show where controls are; they do not prove that an order test passed. This guide does not replace broker terms or risk notices. References to IBKR and TradingView identify their products and do not imply their endorsement of this guide.