Gamma Generate API vs 2Slides API: A Developer's Comparison (2026)

Gamma's Generate API (

) and the 2Slides API (

POST /api/v1/slides/*

) solve the same problem — programmatic deck generation — with different architectures. Gamma generates a web-native document and exports it to PPTX/PDF/PNG; API access requires a Pro plan ($25/month) or higher. 2Slides exposes four generation surfaces — template-driven native PPTX, image-designed slides from a prompt, reference-image style matching, and per-page voice narration — with API keys on any account and pay-as-you-go credits from $5. Both are async job APIs. The right choice depends on output format, pricing shape, and how deep your agent integration goes.

Disclosure up front: 2Slides is our product. Every Gamma fact below comes from Gamma's developer documentation, and we note plainly where Gamma is the better fit.

The full endpoint surface

The two APIs are shaped differently: Gamma is one generation endpoint with many output formats; 2Slides is several specialized pipelines over one job system.

Two notes for fairness: Gamma's single-endpoint design is genuinely elegant if you want four canvas types behind one integration, and its Create-from-Template API (beta) covers a "reuse my existing deck" case that 2Slides addresses differently (themes) — while 2Slides' reference-image matching and narration have no Gamma API equivalent at all.

The requests, side by side

Both APIs follow the same pattern: submit a job, poll for status, download the result.

Gamma —

header, poll every 5 seconds:

curl -X POST https://public-api.gamma.app/v1.0/generations \
  -H "X-API-KEY: sk-gamma-xxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "inputText": "Q3 sales review for the leadership team",
    "format": "presentation",
    "numCards": 10,
    "exportAs": "pptx"
  }'
# → { "generationId": "..." }  then poll GET /v1.0/generations/{generationId}

2Slides Fast PPT — Bearer key, native PPTX from a designed template,

or :

curl -X POST https://2slides.com/api/v1/slides/generate \
  -H "Authorization: Bearer sk-2slides-xxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "userInput": "Q3 sales review for the leadership team",
    "themeId": "minimal-dark",
    "responseLanguage": "en",
    "mode": "async"
  }'
# → job id, then poll GET /api/v1/jobs/{id}; sync mode returns the finished deck in one call

2Slides image-designed pipelines — the two endpoints Gamma has no equivalent for.

generates art-directed slides from a prompt with resolution and aspect-ratio control; derives the entire design system from a reference image:

curl -X POST https://2slides.com/api/v1/slides/create-like-this \
  -H "Authorization: Bearer sk-2slides-xxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "userInput": "Q3 sales review for the leadership team",
    "referenceImageUrl": "https://example.com/brand-slide.png",
    "resolution": "2K",
    "aspectRatio": "16:9",
    "page": 0,
    "mode": "async"
  }'
# page: 0 = auto-detect page count; resolution: 512px | 1K | 2K | 4K
# create-pdf-slides takes the same shape with designStyle instead of referenceImageUrl

Jobs from these two pipelines can then be sent to

( + voice options — single or two-speaker dialogue across 30+ voices) and exported per page as PNG + WAV with , which is how narrated video decks are assembled.

Two structural differences show up immediately. Gamma picks content and design in one shot with optional

, , and controls; 2Slides separates theme selection () from generation, which is what locks visual consistency across runs. And 2Slides offers a synchronous mode for small jobs — useful in scripts where polling is ceremony.

Feature comparison

What the pricing shapes mean in practice

The models differ more than the numbers. Gamma bundles API credits into seats: to call the API at all you hold a Pro-or-higher subscription, credits refresh monthly, and per-generation cost varies because text is billed per card (1–3 credits, model-dependent) and images by quality tier (2–125 credits each) — actual usage is returned in the

field of the polling response. 2Slides bills flat per page, per pipeline: a 10-page Fast PPT deck is always 100 credits (~$0.25 at the $5/2,000 tier), a 10-page 2K image-designed deck is always 1,000 credits ($2.50), narration adds 210/page — whether you generate one deck or a thousand, and there is no subscription gate in front of the key.

Practical translation: for a team already on Gamma Pro that generates a handful of decks programmatically, the marginal API cost is effectively zero. For a service that generates decks for others — a SaaS feature, per-client reports, batch pipelines — predictable per-page pricing without seat requirements is the difference between a costable feature and a variable bill. (Worked batch examples: batch-generating presentations by API.)

Output format: exported PPTX vs composed PPTX

This is the deepest architectural difference. Gamma is web-native first — decks are gamma docs designed for browser viewing and sharing, with PPTX/PDF/PNG produced through

. That makes Gamma's web experience excellent, and it means PowerPoint is a derived artifact. 2Slides' Fast PPT pipeline composes the PPTX itself as the primary artifact — text boxes, layouts, and charts are built in the file, which is why decks stay fully editable in PowerPoint afterward. If your deliverable is a link, Gamma's model is arguably better; if your deliverable is a a client will open and edit, generation-native PPTX avoids the export seam entirely (why that seam matters: why AI slide tools break PowerPoint export). And when the deliverable is visual — brand-matched image slides or a narrated video — the image pipelines plus narration cover ground neither Gamma surface reaches.

Where each API wins

Choose Gamma's Generate API when:

• You need more canvas types than slides — it generates documents, webpages, and social posts through the same endpoint
• Your team already pays for Gamma Pro/Ultra and lives in its editor
• The deliverable is a shareable web link with Gamma's design polish
• You want image-style controls (
  imageOptions.source
  , tone/audience options) in one request

Choose the 2Slides API when:

• The deliverable is native, editable PPTX at predictable per-page cost
• You need design matched to a reference image (
  create-like-this
  ) or art-directed slides at controlled resolution/aspect ratio (
  create-pdf-slides
  )
• You need narration or per-page audio/image assets for video from the same pipeline
• You're integrating via AI agents — the MCP server and Agent Skill make Codex/Claude Code integration a config block, not an SDK project (skills vs MCP guide)
• You generate at volume without wanting per-seat subscriptions, or you need documented rate limits to design against

FAQ

Does the Gamma API require a paid plan?

Yes. Per Gamma's access documentation, API keys are available on Pro, Ultra, Teams, and Business plans — not on Free or Plus. The 2Slides API issues keys on any account, with 500 free credits to start.

Can the Gamma API export real PowerPoint files?

Yes — set

and the completed generation includes an alongside the . The file is exported from a web-native document, so complex layouts are translated rather than composed natively; test fidelity against your own templates.

What does the 2Slides API offer beyond prompt-to-PPTX?

Three additional surfaces:

(image-designed slides from a design-style prompt, 512px–4K, multiple aspect ratios), (derive the whole design from a reference image URL), and (single- or two-speaker narration across 30+ voices on those jobs), plus free per-page PNG+WAV export for assembling narrated videos.

Which API is cheaper for bulk generation?

For text-first decks, 2Slides' flat 10 credits/page (~$0.025/page at the $5 tier) is easier to cost than Gamma's per-card (1–3 credits) plus per-image (2–125 credits) model — and requires no subscription. For AI-image decks, 2Slides is a flat 100–200 credits/page by resolution versus Gamma's per-image quality tiers; run your actual page counts.

Do both APIs work with AI agents like Claude or Codex?

Differently. Gamma offers Zapier automation and prompting Gamma from Claude. 2Slides ships protocol-level integrations — an MCP server any MCP client can call and a SKILL.md for coding agents — covered in the agent skills guides.

Is there a full comparison of Gamma and 2Slides beyond the API?

Yes — the product-level comparison (editor, templates, collaboration, pricing) is in 2Slides vs Gamma; this post covers only the developer surface.