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Sigma

Spanish-language AI assistant used from a chat app for writing, studying, planning and everyday questions.

Freemium
Visit sigm.app Sigma (official site)Compare chat assistants

What is Sigma?

Sigma, at sigm.app, is an AI assistant delivered through a chat conversation rather than a separate app, with a site written in Spanish. It is pitched at students, professionals and people with everyday questions: generating ideas, summarizing and editing text, drafting emails to clients, working out marketing strategy, organizing a calendar, and exploring recipes or new hobbies. The site also says it can transcribe audio to text. Answers come from current AI models, and the stated aim is to make AI simple to use for a broad audience. The site shows a free tier of up to 25 text answers at no cost, and paid packs also appear, with a $5 price listed. Check the site for what each pack includes before paying.

Use cases

  • Ask questions in a chat
  • Summarize and edit text
  • Draft emails to clients
  • Get ideas for projects
  • Plan marketing strategy
  • Transcribe audio to text
  • Study with an academic helper

Who it's for

  • Students
  • Small business owners
  • Professionals
  • Content creators

Why use Sigma

  • Works through a chat, so there is little to learn before asking the first question.
  • Covers study, work and personal tasks in one assistant instead of several tools.
  • Starts free, with a small allowance of text answers to try it first.

Sigma features

  • Text answers from current AI models
  • Audio-to-text transcription
  • Text summarizing and editing
  • Email drafting from a stated purpose
  • Idea generation for projects and social content
  • Calendar organization help
  • Free tier with up to 25 text answers

How to get started with Sigma

  1. Open Sigma from the link on sigm.app and start a conversation.
  2. Type a question or describe the task, such as an email, a summary or a study plan.
  3. Read the answer and ask follow-up questions to refine it.
  4. Upgrade to a paid pack if you use up the free text answers.

Sigma limitations

  • The site and examples are in Spanish
  • The free tier is capped at 25 text answers
  • The site does not name its paid packs; check it for what a pack includes

Sigma pricing

Yes, Sigma has a free plan.

Sigma plans

  • Gratis

    Free

    • Up to 25 text answers at no cost

Plans as listed on the official pricing page on . Prices can change and may vary by country or exclude tax. Check the official pricing page.

Sigma alternatives

The main Sigma alternatives listed on Debuly are ChatGPT, Claude, Microsoft Copilot, Perplexity, Nation AI and Question.AI. The table compares pricing and platforms; order is A–Z.

Sigma compared with its alternatives
ToolPricingStarting pricePlatforms
SigmaFreemium——
ChatGPTFreemium—Web, iOS, Android, macOS
ClaudeFreemium$17/moWeb, iOS, Android, Chrome extension
Microsoft CopilotFreemium$9.99/moWeb, Windows, macOS, iOS
Nation AIFreemium—Web
PerplexityFreemium$17/moWeb, API
Question.AIFreemium—iOS, Android, Windows, macOS

  1. ChatGPT

    OpenAI's AI assistant for chat, writing, analysis, images, voice, deep research and coding across web, iOS and Android.

    Chat assistantsResearch and searchCodingWriting
    FreemiumVisit ChatGPT (official site)

  2. Claude

    Anthropic's AI assistant for chat, writing, analysis, coding and research on web, desktop and mobile, with a free plan.

    Chat assistantsCodingWritingResearch and search
    FreemiumVisit Claude (official site)

  3. Microsoft Copilot

    Microsoft's AI assistant for chat, research and content creation on the web, desktop and mobile, free with a Microsoft account.

    Chat assistantsProductivityResearch and search
    FreemiumVisit Microsoft Copilot (official site)

  4. Nation AI

    AI chatbot with 25 specialist coaches, image creation and PDF tools, free to try without an account.

    Chat assistantsImage generationWriting
    FreemiumVisit Nation AI (official site)

  5. Perplexity

    AI answer engine that searches the web, cites sources inline and offers deep research, multi-step tasks and a choice of top models on paid plans.

    Research and searchChat assistantsProductivity
    FreemiumVisit Perplexity (official site)

  6. Question.AI

    AI homework helper app that solves problems from a photo, chats about study questions and summarizes textbooks and PDFs.

    Chat assistantsWritingResearch and search
    FreemiumVisit Question.AI (official site)

Sigma FAQ

What is Sigma at sigm.app?

It is a Spanish-language AI assistant used through a chat. It helps with writing, summarizing, studying, planning and general questions using current AI models.

Is Sigma free?

The site lists a free tier with up to 25 text answers at no cost. After that you need a paid pack.

How much does Sigma cost?

A $5 price appears on the site for a paid option that mentions up to 100 text answers per pack. The site does not name the plan, so confirm what is included before buying.

Can Sigma transcribe audio?

The site says it can turn audio into text in seconds.

Who is Sigma for?

Students looking for an academic helper, professionals drafting emails or planning, and anyone with everyday questions such as recipes or hobbies.

What are alternatives to Sigma?

General AI assistants such as ChatGPT, Gemini, Claude, Microsoft Copilot and Perplexity cover similar ground.

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

SourceTypeAccessed
sigm.app/pricing

Image credits

  • Logo: from sigm.app · fetched · Vendor trademark, used only to identify the product; removed on request
  • Cover: none collected yet, so a generated tile is shown.

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