Sivi
LoginStart Free

What is a design API?

A design API takes text, brand assets, and size specifications as input and returns a complete, multi-layered design as output. Every element (text, images, vectors, backgrounds) exists on its own layer and can be edited independently. The output is a design file, not a flat image.

Design APIs are used by platforms, apps, and AI agents to automate the creation of marketing visuals: banners, social posts, ad creatives, email headers, and more. They replace the manual work of a designer for high-volume, on-brand creative production.
Try Sivi Design API

4.8/5176K+ brands72+ languages

Sivi awards

How a design API works

  1. You send a request

    A JSON payload with a text prompt or structured content, a brand kit reference, an output size, and a language. No visual input needed.

  2. The engine composes a design

    A Large Design Model (LDM) selects layout patterns, places text as real editable text, positions images and vectors, and enforces brand rules: colors, fonts, logos, spacing. Every element is composed individually, not rendered as a flat image.

  3. You get back a layered design file

    The response contains a free-form design with every element on its own layer. Text is text. Vectors are vectors. You can move, edit, resize, or delete any element in the design studio. Export as JPG, PNG, HTML, or PDF.

Try Sivi Design API

Three types of design-related APIs

Not all APIs that produce visuals are the same. There are three distinct categories, each with a different architecture, output format, and use case.

Template APIs

How they work: You build a template with fixed slots (headline here, image there, logo in the corner). The API fills those slots with your data.
Output: A filled version of the template. Fixed layout.
Examples: Bannerbear, Placid, Abyssale
Good for: High-volume production of visuals that follow the exact same layout. Product cards, social media posts with identical framing, certificates.
Limitation: Every new layout requires a new template. Scaling to hundreds of design variations means building and maintaining hundreds of templates. No creative variety without manual template work.

Image generation APIs

How they work: A diffusion model generates a flat raster image from a text prompt. The model predicts pixels, not design elements.
Output: A flat JPG or PNG. No layers, no editable text, no structure.
Examples: DALL-E, Midjourney, Adobe Firefly, Stability AI
Good for: Generating artistic imagery, illustrations, concept art, background textures.
Limitation: Text in the image is rendered as pixels and frequently hallucinated (misspelled, garbled, or misplaced). No brand enforcement. No editability. Cannot produce marketing-ready designs where text accuracy and brand compliance matter.

Design APIs

How they work: A Large Design Model composes a design element by element. Text is placed as real text. Images and vectors are placed on separate layers. Brand rules (colors, fonts, logos) are enforced automatically.
Output: A multi-layered design file. Every element is individually addressable, editable, and exportable.
Examples: Sivi
Good for: Automated production of marketing designs - banners, social posts, ad creatives, email headers, product visuals - where text accuracy, brand compliance, and editability are required.
Advantage: No templates to maintain. Original layouts generated from scratch. Any size, any language (72+), full brand kit enforcement.
Design APIImage Generation APITemplate API
Core architectureCompositional model that places elements on layersDiffusion model that predicts pixelsSlot-fill system that swaps content into fixed layouts
What the model understandsDesign hierarchy, grouping, spacing, brand rulesVisual patterns and aestheticsNothing; it follows a rigid template
Output structureMulti-layered file with independent elementsSingle flat raster, no layersFilled copy of a predefined template
How text worksPlaced as real text on its own layer, always accurateRendered as pixels, frequently hallucinatedPlaced in template slots, accurate but constrained
Creative varietyOriginal composition every time, same prompt yields different layoutsUnpredictable, no layer guaranteesOne layout per template, zero variety
Fundamental tradeoffNo artistic or photographic imageryNo text accuracy, no editability, no brand controlNo creative variety, linear scaling cost
Category maturityEmerging (2023+)Established (2022+)Legacy (2010+)
Try Sivi Design API

When to use a design API

A design API is the right choice when your use case requires any combination of the following:

Text accuracy

The design contains headlines, CTAs, product names, or prices that must be letter-perfect. No hallucinated text.

Brand compliance

Every output must use the correct hex codes, fonts, logo placement, and spacing. Enforced automatically, not manually.

Editability

The output needs to be editable after generation. Users or systems need to change text, swap images, or adjust layout.

Volume

You're generating hundreds or thousands of designs per day. Templates can't scale without proportional maintenance effort.

Multilingual

The same design needs to work in 10, 30, or 72 languages. The layout must re-compose per language, not just swap text strings.

Programmatic control

You need to generate designs from code, in a pipeline, or through an AI agent without any human in the loop.

Try Sivi Design API

Use cases by category

Any platform that needs to produce marketing visuals at volume, with text accuracy and brand compliance, is a candidate for a design API. Common categories include:

Platform typeWhat the design API does
EcommerceThousands of SKUs, each needing product banners and promotional creatives. Manual design does not scale to catalog size.
AdvertisingCampaigns require dozens of ad sizes and variations. A design API produces them from a single brief.
Social mediaUsers expect to create branded content without leaving the platform. A design API makes that possible.
EmailCampaign visuals need to match content and render correctly across email clients. HTML-safe export is essential.
Website buildingUsers need hero banners and blog covers on demand, not pre-made templates to browse.
LLM and AI productsText generation and design generation can be chained in a single agentic workflow, producing a complete marketing package.
AgenciesEach client needs a branded creative portal. A design API with brand kit enforcement eliminates per-client template maintenance.

How Sivi's design API works

Sivi is the first design API built on a Large Design Model. Here's what that means for developers:

Input options

  • Designs from Prompt: Send a natural language prompt ("Summer sale banner for urban clothing brand") and Sivi composes the design.
  • Designs from Content: Send structured content (headline, body text, CTA, product image URL) and Sivi arranges it into a design.

Any size, any language

Specify any custom dimension. The model doesn't stretch or crop, it composes the entire layout for the target size. Same for languages: switch from English to Arabic, and the layout flips to RTL with correct typography.

Brand kit enforcement

Attach a brand kit to your API key. Every design generated through that key automatically uses the correct colors, fonts, logos, and spacing. No manual checking.

Try Sivi Design API

Three integration paths

PathWhat it isBest for
REST APIHeadless. Send JSON, get back a layered design.Backend automation, bulk generation, server-side pipelines
SDKDrop-in React component. Full design studio in your frontend.Client portals, SaaS embeds, seller dashboards
MCPModel Context Protocol server. AI agents call Sivi as a tool.AI assistants, agentic workflows, copilot features
Try Sivi Design API

When a design API is NOT the right choice

You need artistic imagery.

For photo-realistic scenes, illustrations, concept art, use an image generation API like DALL-E or Midjourney.

You need photo editing.

For cropping, retouching, filters, background removal, use an image editing API, not a design API.

You need a fixed, pixel-perfect layout every time.

If the design must look identical across every output with zero variation, a template API gives you that control.

Try Sivi Design API

Design APIs: What everyone wants to know

Try Sivi Design API
01Is a design API the same as an image generation API?
No. An image generation API (DALL-E, Midjourney, Firefly) produces a flat raster image where text is pixels and nothing is editable. A design API produces a free-form, multi-layered design where text is real text, every element is on its own layer, and the entire output is editable. Different architecture, different output, different use case.
02Can a design API replace a graphic designer?
For high-volume, templated work - yes. For bulk product banners, social post variations, ad creatives in multiple sizes and languages, a design API handles this faster and cheaper than manual design. For strategic brand work, campaign concepts, and custom creative direction, you still need a designer.
03Do I need templates to use a design API?
No. A generative design API like Sivi creates original layouts from scratch. You send a prompt or structured content, and the model composes a new layout every time. No templates to build or maintain.
04How does a design API handle brand consistency?
Through a brand kit. You upload your brand's colors, fonts, logos, and style rules once. The API enforces them on every design generated under that brand kit. No manual review needed.
05Can a design API generate designs in multiple languages?
Sivi supports 72+ languages including RTL scripts (Arabic, Hebrew, etc.). It composes the entire layout so typography, reading direction, and spacing work correctly in the target language.
06How do AI agents use a design API?
Through the Model Context Protocol (MCP). The AI agent treats the design API as a callable tool. It sends a design brief, receives a layered design back, and presents it to the user. This means any MCP-compatible assistant (Claude, ChatGPT, Cursor, Windsurf) can generate marketing designs as part of a conversation without switching apps.
07What's the cost of using a design API?
API access is included from the Pro plan ($48/month billed yearly, 300 credits), roughly $0.16 per design at 1 credit each on Gen-2E or Gen-3 (Gen-3H models cost more per design), compared to $15+ per banner with manual design at $60/hour. View full pricing

What business owners, marketers, AI enthusiasts, and designers say about Sivi

I like how the prompt wizard is created. Generate process is cool. I like the approach when you actually see what is going on, instead of looking at some spinner for X minutes and be not sure if it is still processing or it is freezing. Simple and easy to use Edit mode. This is really cool product.
George FrigoLead product designer
Sivi.ai is an impressive tool that can significantly speed up your design workflow. Its ability to generate visuals in a variety of dimensions and the option to edit the designs make it a versatile option for anyone in need of appealing designs.
Max YampolskyFounder @ One Click Crypto
Really great tool, game-changer that disrupts a huge market and everything connected with design and content creation.
Anna SvirshchevskayaProduct owner at @Paige
I am an early beta user of Sivi and I love its present and future. I love the deep thought the team has put in it to understand the design process and making it business owner savvy. This is transformational for our GTM to help us quickly have multiple options in design for our messaging.
Pradeep SoundararajanFounder CEO of Bugasura.io
As per the tool - I’ve been looking for a long time when there will be an AI tool to generate design from text with a user-friendly interface. And it seems like this is the one!
Oleksandr NaumovMarketer
Loved the idea of providing a prompt template to help new users get the most out of their first tries! I was surprised by how complete this product is, being able to edit the content and the visuals separately is a really good idea.
Florian MyterCo-Founder weave.ly
176K+ Brands
4.8/5
nasscom ai10,000 StartupsNASSCOM Technology & Leadership ForumForbes India DGEMS 2023YourStory Tech30Google for Startups AI Academy APACGoogle Cloud for StartupsNVIDIA Inception ProgramSalesforceELEVATETiE BangaloreBengaluru Tech Summit 2022