Best AI app to code MT4 bots / EAs

Hello all,

I am trying to find the best AI app to code MT4 EAs or MT4 indicators.

Tried chatGPT of course, it's good for Python scripts, macros, etc....but MT4 not really.
I then tried a few more, but I spent more time debugging the same issues than testing EAs.
The best I've found so far is Mistral AI chat:
https://chat.mistral.ai/chat

Note, it is the best I've found so far, but it's still not there. I still have to debug a ton (not a few minutes, but hours).
Any ideas on good MT4 EA AI coder apps?

My experience is (1) you still have to know a little bit of MQL4, so you can sort of guide the AI at times (as an example, there was issue with the use/conversion of pips to points & vice versa in an EA coded by the AI, and was eventually sorted after I kind of directed the AI). (2) You have to clearly, step-by-step explain your requirements (i.e. what you want the EA, indicator etc.) to do to the AI. (3) I find that one AI does not come up with a working EA, indicator etc. all the time. Sometimes, one AI will code a working EA that meets your requirement, but then you ask the AI to code another EA with a different requirementt and it fails miserably, meanwhile another AI which could not code the first EA to work, will now code the second EA to work. So, from my experience, you have to try all the AIs until you get the one that produces a working EA or indicator for you. I normally start with Claude, then Grok, Gemini, ChatGPT, Perplexity and Deepseek. They have changed my life. I now get my EAs/indicators coded using these AIs, as unfortunately coders don't have much time to assist one these days on forums.

Many thanks Danjuma! This is very helpful, and indeed, sounds quite similar to the issues I've been having. There is no 1 AI that can code the whole project in one go, and there is none to do the job smoothly.

Thanks for the list, I will surely give them a try!

Yotobe,

My Experience using AI and Building a Personal MQL4 Coding Assistant and Forex Market Review Assistant.

I’ve been programming in MQL4 for many years, yet I still consider myself a novice compared to the many talented contributors here on Forex Factory.

As a programmer, I couldn’t resist exploring the potential of AI. I’ve since subscribed to ChatGPT Plus and integrated Visual Studio with the free version of GitHub Copilot, after going through the same AI journey as you.

After experimenting with various GPTs tailored for MQL4 and asking ChatGPT to write code, I quickly realised that creating my own MQL4 Coding Assistant would be far more effective. By training it with the specific resources I use, I’ve tailored it to respond exactly how I need.

The setup process was straightforward — I simply asked ChatGPT to help me build an MQL4 Coding Assistant.

The result is a well-organised Project Folder, populated with documents the assistant references when answering coding questions. These include:

1. MQL4 Language Reference
2. MQL4 Quick Reference
3. Supplementary training materials and guides
4. A comprehensive library of standard functions and routines
5. My personal collection of MQL4 indicators
6. An ever-expanding archive of third-party indicators I continue to upload

The impact on my development workflow has exceeded expectations. Whether I need help coding or want to test a new idea, I just ask the assistant (No Searching the Internet and MQL4 Forums any longer)— and it delivers a relevant explanation, code snippet or indicator (I do not code EA's as I prefer manual trading for just few hours a day). While it doesn’t always compile perfectly on the first try, the accuracy improves steadily as I continue training it to avoid common mistakes.

Of course, a ChatGPT Plus subscription is required. But since trading is a source of income for me, investing in tools is a necessary and worthwhile expense.

For your own use case, your MQL EA Coding Assistant could provide just what your seeking if you uploaded a curated library of Expert Advisors for it to reference.

In addition to AI coding support, I’ve created a AI Forex Market Review Assistant. This assistant is trained to deliver up-to-date market analysis — either a Daily Review, Intraday Report, or a broader Market Overview covering a currency or the entire market.

Each currency pair has its own dedicated message thread within the Project Folder. I simply request the report I need, and a few moments later, it's delivered. Every day before I start trading, I review the reports — each formatted to provide the data I need to make well-informed decisions.

Ask your favourite AI assistant to help you get started, the investment in time and subscriptions is worthwhile.

TimeFX

https://www.cursor.com/
Custom rules/instructions, so you can tame the Claude with his excessive enthusiasm
Custom documentation. You can refer to your existing codebase, etc


My favs marked



https://docs.cursor.com/settings/models

With a basic plan - Get API key to use Gemini models virtually unlimited
https://aistudio.google.com/apikey
https://ai.google.dev/gemini-api/docs/rate-limits

this one is the best ive found so far

https://www.yeschat.ai/

and its a paid thing

Thanks timefx, Wolfram, and soladood !!!

An interesting view on AI Software Development from Bill Gates.



This appears to align with all the comments AI Coders are expressing regarding compile errors and the need to keep asking AI to fix them.

In my early years as a programmer, I saw this happening with other programmers time and again, I called this the hit an miss approach to programming. Mmm that didn't work, let me try this and so on and so on, until you get no errors and then debugging starts.


Programming is a creative art and skill, you not only have to understand the code, you need to understand what your designing, how to code it efficiently and test the results are correct as per the design.

ChatGPT, using GPT MQL4 Code Wizard (MT4) has provided the most consistent results for me so far, for basic MT4 coding.

TimeFX

I also use:
GPT MQL4 Code Wizard (MT4)
In regard to the compile errors, I see them also, but I stress to the AI that I want to have it check for errors before sending code to me, sometimes have to be emphatic about it, and that reduces the compiling errors to a minimum. Also, I have a feeling that AI will replace coders and system analysts sooner than many people realize.

HI guys ,I would like to create a custom made indicator with CHatGPT , MTF RSI indicator with anusingalarm system with trend lines. I am not a programmer only a trader. Chatgpt was able to buid me a nice MTF RSI indicator, but had hard time create a panel with a the key information on it. I am stuck there, it is unable to create a good solution for a panel on the rigth handside which is visable correctly. Can anyone help me to move further , what to do now..

I've tested most AI models for MQL4 coding. The issue is that most LLMs were trained
on general code, not specialized on MQL4/MQL5 syntax and MT4/MT5 specific functions.
**What works best for me:**
1. **Claude (Anthropic)** — significantly better than ChatGPT for MQL. It understands
order management, indicator buffers, and MT4-specific quirks much better.
2. **Prompt engineering matters** — instead of "write an EA", try:
- "Write MQL4 code for a breakout strategy with these rules..."
- Include error handling, magic number, and trailing stop in the prompt
3. **Break it down** — ask for individual functions first (order open, trailing stop,
signal detection), then integrate. Much less debugging than asking for full EA at once.
4. **Use AI as assistant, not replacement** — it gets you 80% there, but you still need
to understand MQL to fix the remaining 20%.
Mistral is decent, but for MQL specifically, Claude has been the most reliable for me.

No LLM can make you unique algos...get it straight.
What gpts are good is that they can rehearse your code, correct it, but it is not some magic panace, where it iwll be do all for u.
Try this "Write me a script, that will generate BUY signals whevner a proper breakout will pop up from a broken channel" and then run the code..I bet u ll see 0 that you wanted to achieve. then, when u try to refit it, u ll end up with spaghetti code.
The best is to come up with your own ideas - code it, then ask gpts for correcitons, ideas...
HUMAN FIRST, then machine

AI is like an assistant that you constantly have to watch and check their work..
If you have no idea on coding you will spend weeks going around in circles trying to debug code.

As mentioned above, the clearer, more precise your prompt is, the closer AI will return to what you want.
But NEVER EVER trust what it codes till you have tested, and retested...

I just want to thank everyone for your comments

created with ai grid and martingale TF M15 only

I can confirm that I tried both ChatGPT and Claude and that Claude produced much better results. I am a novice at coding, my EA was fairly simple but with some specific things needed. I kept going round and round with ChatGPT and couldn't get it to work. I had to go back with Claude a few times to fix bugs but in the end it worked so I was happy with the result. For something more complex you would definitely need to understand coding or know/pay someone who could help.

Used Claude to make this Tokyo Fibonacci indicator for MT4 (It also made it for MT5 and Tradingview). If you have zero coding knowledge, you're gonna need to be very specific and include all the details in one prompt. You'll also need to search online for resources to correct some errors that the AI might find difficult resolving.