Build AI-powered software with ease

Open

March 30, 2023

Rank #3904

Marvin

Coding

1,656

No ratings

Use tool Copy 🔗

Inputs:

Outputs:

Build AI-powered software with ease

Overview

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

Featured alternatives

Overview Discussion

Overview

Marvin is an open-source library designed for building AI-powered software. It introduces a new concept - AI functions that generate outputs on-demand through AI, without relying on source code.

These functions work with native data types and can be integrated seamlessly into any codebase, thus eliminating the need for complex code for tasks like extracting entities from web pages or categorizing items in a database.

Marvin also features more flexible bots, which are highly capable AI assistants that can be given specific instructions, personalities, or roles. Additionally, developers can use Marvin to add AI capabilities wherever they are most impactful, without needing to start from scratch.Marvin is an opinionated, high-level library with the primary goal of integrating AI tools into software development.

It is ideal for those who want to process structured data without needing traditional source code, integrate an AI assistant into their code, or deploy cutting-edge AI technology with confidence.

Marvin's prompts have been tested and hardened for months of real-world use, and its code is available on GitHub under an Apache 2.0 license. However, Marvin does not provide full control of an AI, nor does it help developers to write source code.

In summary, Marvin is a powerful tool for building AI-powered applications that do not rely on traditional source code. Marvin's AI functions and bots make it easy to integrate AI capabilities into any codebase, without requiring extensive AI knowledge.

Its convenience, flexibility, and ease of use are ideal for software developers looking to leverage AI's advantages in their work.

Releases

MarvinInitial

Get notified when a new version of Marvin is released

Notify me

Initial release

March 30, 2023

Initial release of Marvin.

+ Submit new release

By unverified author Claim this AI

Pricing

Pricing model

Free

Paid options from

Free

Use tool

Save

🔗 Copy link

🗳️ Vote Best AI Tool

Featured

Coding Marvin

Coding

1,656

No ratings

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

Use tool

Save

Top alternatives

OnSpace.AI - No Code App Builder v1.2.0

Build Apps with AI, No Code

Coding

Open

61,113 www.onspace.ai

Johnson

🙏 114 karma

Jul 16, 2025

@OnSpace.AI - No Code App Builder

Would rate 4.9 if possible, but rounding up to 5 stars because this app truly excels compared to other AI coding tools. Why 5 Stars: Best-in-class AI coding assistance Huge improvements over competitors Actually works for real development Real Impact: I successfully built and published an actual app using this tool - that's game-changing for non-developers like me. Bottom Line: Yes, there's room for improvement, but this is already the top AI coding app available. The fact that ordinary people can create real apps with it says everything. Perfect for anyone wanting to turn ideas into actual apps!

9321 Reply Share Edit Delete Report

Share

Released 4mo ago
Free + from $20/mo

69,953
175
4.1
Cursor v2.0

AI-powered IDE for faster coding

Coding

Open

43,192 www.cursor.sh

Vanessa

🙏 113 karma

Dec 19, 2024

@Cursor

Cursor is underrated.

879 Reply Share Edit Delete Report

Share

🇺🇸 United States

Released 1mo ago
Free + from $16/mo

55,574
340
4.7
Programming Helper

Generate code from text descriptions instantly.

Coding

Open

Oran Kangas

🙏 3 karma

Jul 28, 2023

@Programming Helper

Code varies from run to run. Still it is a helpful app. You can specify coding languages that are not in the dropdown menu.

3 Reply Share Edit Delete Report

Share

Released 3y ago
No pricing

41,008
860
3.1
CodingFleet

AI wizard transforms instructions into code snippets.

Coding

Open

31,817 codingfleet.com

Umer Colville

🙏 23 karma

Jul 30, 2025

@CodingFleet

Honestly this is the GOAT, I tried this tool and it was able to either help debug or make scripts from the ground up. It has support for a lot of support languages too, which adds extra points to how good this tool is.

5 Reply Share Edit Delete Report

Share

Released 8mo ago
Free + from $7/mo

35,382
57
4.8
Github Copilot

AI-powered coding assistant for faster development

Coding

Open

18,181 github.com

Francisco Silverio

🙏 38 karma

Jun 2, 2023

@Github Copilot

A whole new way of learning how to code

291 Reply Share Edit Delete Report

Share

Released 4y ago
Free + from $10/mo

33,696
265
4.6
Devra

Your AI coding worker bee.

Coding

Open

26,083 devra.ai

Brian Risk

🛠️ 1 tool 🙏 19 karma

Nov 17, 2024

@Devra

I use Devra for every project -- I've created 5 new projects this year with it

194 Reply Share Edit Delete Report

Share

Released 1y ago
#4 in Trending

31,952
69
4.2

Promote AI Claim AI New release

Reviews

No ratings yet.

★ ★ ★ ★ ★ 0

★ ★ ★ ★ 0

★ ★ ★ 0

★ ★ 0

★ 0

Your rating

★ ★ ★ ★ ★

Post

How would you rate Marvin?

Help other people by letting them know if this AI was useful.

Prompts & Results

Title:

Description:

Prompt type*:

Prompt*:

Output type*:

Output*:

Add your own prompts and outputs to help others understand how to use this AI.

Pros and Cons

Pros

Open-source library

Works with native data

Can integrate into codebase

Flexible bots integration

Application doesn't need source code

Processes structured data without code

Bots with personalities

Plugin supported

Knowledge storage

Available Python API

Interactive CLI

FastAPI server

Built on Pydantic, FastAPI

No source code for sentiment categorizing

Bots can hold conversations

Bots use custom plugins

Functions without source code

Optimized for useful outcomes

Hardened prompts

Operates on GPT-4, GPT-3.5

Functional prompt engineering

Extracts data from complex inputs

View 17 more pros

Cons

Not for writing source code

Limited to GPT-4 and GPT-3.5 models

Doesn't expose LLM configuration

Doesn't allow full prompt control

Not for existential enlightenment

Opinionated library, limited customisation

Doesn't support raw LLM prompts

View 2 more cons

Included in lists

Free Coding Apps

1931

+16

Adam Howard

Q&A

What is Marvin?

Marvin is an open-source library designed for building AI-powered software. It offers a new concept of AI functions that produce results on-demand via AI, without relying on source code. Marvin also introduces highly able AI assistants, known as bots, that can take on particular instructions, personalities, or roles. Marvin is particularly suitable for integrating AI tools into software development, processing structured data, and enhancing codebases with AI functionalities without starting from scratch.

What are the key features of Marvin?

Marvin's key features include AI functions that process structured data without source code, bots with personalities that follow instructions, the ability to build plugins to augment bot capabilities, knowledge storage that bots can use, and availability as a Python API, interactive CLI, or FastAPI server.

How does Marvin work?

Marvin integrates AI directly into your codebase by creating AI functions that simulate regular functions, generating outputs on-demand using AI instead of relying on source code. This enables developers to avoid writing complex code for tasks such as extracting entities from web pages or categorizing items in a database. Developers simply need to describe their requirements, call the function, and receive their results. Marvin also includes bots that can follow specific instructions and roles, enhancing its capabilities.

What are AI functions in Marvin?

In Marvin, AI functions are a unique feature that differentiates from traditional functions in that they don't depend on source code but instead generate their results via AI. These functions work with native data types and can be integrated into any codebase. For instance, these functions can execute tasks like extracting entities from web pages, scoring sentiment, or categorizing items in a database.

What is the role of bots in Marvin?

Bots in Marvin are highly capable AI assistants that can be given specific instructions, personalities or roles. They can use custom plugins, leverage external knowledge, and automatically generate a history of every thread. They are designed to be integrated into a codebase but can also be exposed directly to users. In essence, bots function as a type of AI function.

Can Marvin integrate with any codebase?

Yes, Marvin can seamlessly integrate with any codebase. Its AI functions have been designed to work with native data types enabling them to be woven into sophisticated pipelines and different codebases. This ease of integration transforms the traditional use of AI from a single string input to output format to a more dynamic, functional parameter model.

+ Show 14 more

Does Marvin help with writing source code?

Marvin is not designed to assist in writing source code. Its primary function is to perform tasks that are difficult or impossible to express in source code. Marvin facilitates complex reasoning within code in a way that feels intuitive and natural.

In what situations should I use Marvin?

You should use Marvin if you want to process structured data with AI functions, if you need an AI assistant in your code that can follow instructions and solve complex problems, and if you want to deploy cutting-edge AI technology with confidence but with minimal decision-making. Marvin is ideal if you are more interested in using AI systems rather than building them.

When shouldn't I use Marvin?

You should not use Marvin if you desire full control of an AI, as Marvin is a high-level library that does not generally expose LLM configuration to users. If your intention is to employ an AI copilot for writing code, Marvin may not be a fit. Marvin also may not be suitable if you want to use other LLM models besides OpenAI's GPT-4 and GPT-3.5, or if you want complete control of your prompts.

What are Marvin's limitations?

Marvin's limitations include not providing full control of an AI and not assisting developers in the process of writing source code. It is primarily designed to operate with OpenAI's GPT-4 and GPT-3.5 models, and might not function effectively with other LLM models. Moreover, Marvin does not provide complete control over prompts as it is designed to generate prompts that are likely to deliver the outcome the user wants, even if they are not exactly what the user provided.

How does Marvin handle structured data?

Marvin handles structured data using AI functions. These functions process structured data without using any source code. This allows Marvin to perform complex tasks, such as extracting entities from web pages, scoring sentiment, or categorizing items in a database.

Is Marvin an open-source tool?

Yes, Marvin is an open-source tool. It is licensed under Apache 2.0 and its code is available on GitHub.

Can I assign specific roles to Marvin's AI bots?

Yes, Marvin's AI bots can be given specific roles. In addition to following detailed instructions, these bots can assume specific roles as part of their functionalities, making them flexible and adaptable to varying user needs.

Can Marvin's AI bots have specific personalities?

Yes, bots in Marvin can have specific personalities. This feature allows for a more personalized engagement and better interaction with the users, adding a more human-like aspect to AI interactions.

What kind of tasks can Marvin's AI functions perform?

Marvin's AI functions can perform a variety of tasks that would otherwise require complex coding or impossible to express in source code. Some examples include extracting entities from web pages, scoring sentiment, categorizing items in a database, making a list of all the animals in a paragraph, generating JSON documents from HTML content, or extracting keywords that match specific criteria.

Does Marvin provide full control over an AI?

Marvin does not provide full control over an AI. Although Marvin is a high-level library, it doesn't generally expose LLM configuration to users. Rather, it applies settings that give the best results under most circumstances, considering Marvin's built-in prompts.

What AI models does Marvin support?

Marvin primarily supports GPT-4 and GPT-3.5 models from OpenAI. Hence, its versatility may be limited for other LLM models.

How can I start using Marvin?

To start using Marvin, you can install it with pip install command. You can then use marvin chat to interact with Marvin AI. You'll also need to consult the getting started documents for detailed guidance.

What are the prerequisites for implementing Marvin into my project?

The prerequisites for implementing Marvin into a project will primarily depend on the specific integration requirements of the project. However, as a Python-based tool, having Python installed would be a basic requirement. Additionally, understanding Marvin's functionalities such as AI functions and bots along with knowledge about AI integration and command-line usage will be beneficial.

What type of AI capabilities can I add to my project using Marvin?

Using Marvin, you can add AI capabilities such as processing structured data without source code, a bot assistant that can follow instructions and solve complex problems, and capabilities that would otherwise be difficult or impossible to implement with traditional source code.

Ask a question

Submit

#3904

Search

Marvin

Overview

Releases

Pricing

Top alternatives

Related topics

Reviews

How would you rate Marvin?

Prompts & Results

Pros and Cons

Pros

View 17 more pros

Cons

View 2 more cons

Included in lists

Q&A

Search

Overview

Releases

Pricing

Top alternatives

Related topics

Reviews

How would you rate Marvin?

Prompts & Results

Pros and Cons

Pros

View 17 more pros

Cons

View 2 more cons

Included in lists

Q&A

Help

People also viewed

Feedback and Incident Report

AI Options

Create AI Tools

Mini Tool

Vibe code an AI Tool