Open source alternative to Gamma and Beautiful.ai
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Build editable HTML presentations from a text prompt in a local-first Electron app, with 90+ styles, AI image generation, and PPTX import and export.
Create presentation decks from briefing notes or uploaded DOCX files without routing client data through a third-party server. The local-first model suits NDAs and internal policy that restricts data leaving a managed device.
Your organization already has a Gamma or Beautiful.ai subscription and content policy allows cloud generation. The setup effort for Oh My PPT is higher than starting a cloud tool directly.
Upload a markdown outline or plain text notes and generate a structured lesson deck in the selected style. Speaker notes can be generated per slide or for the full deck in formal, conversational, or narrative tone.
You need real-time collaborative editing with students or colleagues. Oh My PPT is a single-user desktop app with no live co-editing; cross-device work requires exporting and importing session files manually.
Import a branded PowerPoint template, preserve its visual structure, and use AI to populate content while keeping the layout. Styles extracted from the imported file can be saved and reused across new sessions.
Your PPTX files use complex custom animations, embedded Excel charts, or unusual fonts not available in the app. Fidelity depends on file complexity, and the README notes these areas are still being improved.
Connect a local Ollama model to test presentation generation quality against different model sizes, or proxy requests through an internal API gateway. The OpenAI-compatible interface means any model that exposes that protocol works as a text backend.
You need a fully stable, production-ready offline workflow today. The project was created in April 2026 and some features are still maturing; expect active development and occasional rough edges.
Most AI presentation tools generate slides through a cloud service, which means confidential content, client data, and unpublished ideas pass through a third-party server before becoming a deck. For consultants working under NDA, healthcare teams handling patient-adjacent materials, and product managers presenting unreleased roadmaps, that creates a real compliance and confidentiality exposure.
The practical problems extend beyond privacy. Subscription costs add up for teams that only need occasional AI generation rather than daily use. Cloud tools output proprietary or web-native formats that are difficult to edit in PowerPoint or Keynote after export. Existing PPTX templates that teams have refined over years typically cannot be imported; cloud tools require building from scratch instead.
Describe a topic or upload a document (txt, md, csv, docx) and the app generates a full HTML slide deck. The AI plans the outline, picks a colour scheme, and applies one of 90+ built-in visual styles. Text, images, and layout are all editable after generation, and multiple generation tasks can run in parallel in the background.
Sessions, source documents, and generated assets are stored on your computer. No account is required and nothing passes through Oh My PPT's servers. AI requests go only to the text or image provider you configure in settings. The app itself processes nothing in the cloud.
Import existing PPTX files and edit them inside the app with near 100% visual fidelity, or export a generated HTML deck to a PPTX file that opens in PowerPoint or Keynote. Import and export are built on the project's own pptx2json and html2pptx libraries. Complex charts, tables, and animations are still being improved.
Choose from more than 90 visual themes covering minimal white, Bauhaus, neon, Japanese minimalism, and content-platform formats. Styles control colour palette, typography, layout rhythm, and which image slots the AI fills. You can also create custom style packs using the companion style-generate-skill tool.
Connect a local Ollama instance by pointing the app at http://127.0.0.1:11434/v1 with any OpenAI-compatible endpoint. The API key field requires any non-empty string when using Ollama. Text generation, document parsing, and conversational editing all use the configured model. Image generation uses a separate provider configuration. Models of 14B parameters or above are recommended for local use.
Export finished presentations to PDF for sharing and archiving, PNG for individual slides or long composite images, MP4 video for social media, editable PPTX for continued work in PowerPoint or Keynote, or a standalone HTML bundle that runs in any browser without additional software.
Gamma is a cloud-based AI tool that generates polished, web-native slide decks from a prompt, with output stored and shared through Gamma's platform. Oh My PPT addresses the same AI-generation workflow but stores everything locally on the user's machine.
| Feature | Oh My PPT | Gamma |
|---|---|---|
| License | Apache 2.0 | Proprietary |
| Self-hosting | Local desktop app | No |
| Offline support | Yes (local models) | No |
| Bring your own model | Yes | No |
| Data residency | On-device | Gamma cloud |
Oh My PPT is the better choice for work where content cannot leave the user's device: client briefs, healthcare materials, or internal strategy documents. Gamma is a better fit when ease of setup matters most and there is no data-residency requirement. It works immediately after sign-up with no API key configuration, and its collaborative sharing features suit teams that review decks together online.
Beautiful.ai is a subscription-based AI presentation maker focused on design automation. Its smart slide engine enforces visual consistency and guides non-designers through creating professional-looking decks quickly.
| Feature | Oh My PPT | Beautiful.ai |
|---|---|---|
| License | Apache 2.0 | Proprietary |
| Self-hosting | Local desktop app | No |
| Offline support | Yes (local models) | No |
| Bring your own model | Yes | No |
| Style library | 90+ built-in presets | Paid platform |
Oh My PPT is worth choosing when offline support, full data locality, and no recurring subscription fees are requirements. Beautiful.ai is a better fit when consistent visual design for non-technical users is the primary goal and cloud data processing is acceptable for the team.
Download the installer for macOS and Windows from GitHub Releases: https://github.com/arcsin1/oh-my-ppt/releases/latestYes, with conditions. The app itself runs fully offline. If you configure a local Ollama model for text generation and a local image provider, presentation creation requires no internet access. If you use a cloud-hosted API (GPT, Claude, etc.), those requests need a connection; editing and export still work offline.
Any model that exposes an OpenAI-compatible API endpoint. That covers cloud providers (GPT, Claude, Gemini, DeepSeek, Qwen, Kimi, Doubao, GLM) and local models via Ollama. Text and image generation use separate configuration slots in settings. The README recommends 14B-parameter models or larger for local text generation.
Yes. The app exports to editable PPTX using its own html2pptx library. For typical slide layouts, visual and structural fidelity is near 100%. Complex charts, tables, and animations are still being improved; the README notes this is an ongoing area of development.
The installers are not yet code-signed, which triggers macOS Gatekeeper. Right-click the app and select Open to bypass the warning, or run xattr -cr /Applications/OhMyPPT.app in Terminal. This is a known issue documented in the README and not an indicator that the app itself is unsafe. Download only from the official GitHub Releases page.
Yes. It is licensed under Apache 2.0, which permits commercial use, modification, and distribution, including in proprietary products, provided the original copyright and license notice are retained. There are no usage restrictions on running it internally or distributing modified versions.
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