Lightning AI vs sizeless: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Lightning AI and sizeless — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Lightning AI
Lightning AI
All-in-one platform to prototype, train, scale, and serve ML models from the browser with zero setup, from the creators of PyTorch Lightning.
Key features
- Browser-based Development: Zero-setup web studio for coding, prototyping, and collaborative experiments directly from the browser, reducing onboarding friction for teams.
- Integrated Training Stack: First-class integration with PyTorch Lightning and Lightning Fabric to run experiments, leverage built-in training features, and accelerate model development workflows.
- LitServe Inference Engine: Deploy any model type (vision, audio, text) or full AI systems (agents, RAG, pipelines) with batching, multi-GPU support, streaming outputs, and custom logic without YAML or heavy MLOps.
- Model Hosting and Checkpoints: LitModels capability to save, load, host, and share model checkpoints with enterprise-grade access controls and options to host on Lightning or self-managed cloud.
- Autoscaling Cloud Deployment: One-command deployments to Lightning AI cloud with autoscaling, security controls, and high-availability SLAs (99.995% uptime when deployed via platform).
- LLM Router & Agent Framework: Tools and libraries to route calls to LLM APIs, unified billing, retries/fallbacks, logging, and a minimal agent framework for building LLM-based applications.
- Dataset & Optimization Tools: Utilities such as litData for transforming and optimizing datasets at scale and Lightning Thunder compiler for performance/memory optimizations during training and inference.
- Self-Host Flexibility: Option to self-host all components for full control or use Lightning's managed cloud for faster time-to-production with built-in monitoring and security.
- Browser-based collaborative development with zero setup
- End-to-end tooling: prototype, train, optimize, host, and serve models
- LitServe: flexible inference engine for agents, RAG, pipelines, multi-model serving, streaming and batching
- LitModels: save, load, host, and share model checkpoints with enterprise-grade access controls
- LitData: dataset transformation and optimization at scale
- PyTorch Lightning / Lightning Fabric integration for structured training and low-level control
- Lightning-thunder: PyTorch compiler optimizations for performance, memory, and parallelism
- One-click cloud deployment and CLI (e.g., lightning deploy server.py --cloud) with autoscaling and managed uptime
- Support for self-hosting or managed hosting, multi-GPU, custom logic, and advanced routing (LLM router, retries, fallback, logging)
- Open-source components under Apache-2.0 and active GitHub ecosystem
Best for
- Collaborative Prototyping: Rapidly prototype model ideas and iterate with teammates in a browser workspace without local environment setup.
- Training Large Models: Run scalable training experiments using PyTorch Lightning/Fabric with built-in optimizations and support for multi-GPU or distributed setups.
- Production Inference for Agents and RAG: Deploy multi-model agents, chatbots, or retrieval-augmented generation pipelines with LitServe’s batching, streaming, and custom logic features.
- Model Hosting and Sharing: Save, host, and share model checkpoints with access controls for team collaboration or enterprise governance using LitModels.
- Cloud Deployment with Autoscaling: Deploy model servers to Lightning AI cloud with autoscaling and high uptime guarantees for production traffic.
- Self-Hosted Enterprise Deployments: Run the full stack on private infrastructure for customers needing full control over data, security, and compliance.
- Rapid prototyping and collaborative model development in the browser without environment setup
- Training and fine-tuning models using structured PyTorch Lightning workflows
- Deploying inference services, agents, chatbots, and RAG pipelines with multi-model and streaming support
- Hosting and sharing model checkpoints with access controls and integration into training workflows
- Transforming and optimizing datasets for faster training at scale
- Applying compiler-level optimizations for faster training and inference on multi-GPU setups
- Self-hosting ML systems on customer infrastructure or using Lightning AI managed cloud for autoscaling production
sizeless
sizeless
Turns a smartphone video of an open trench into a centimetre-accurate 3D point cloud, CAD as-built plan and GIS-ready digital twin of buried utilities.
Key features
- Smartphone capture: Field crews record an open trench with a standard iPhone Pro — no specialist scanning hardware and no separate surveying appointment
- Centimetre-accurate point clouds: Reconstruction algorithms developed at ETH Zurich build a high-resolution 3D point cloud of the excavation from the video alone
- Standards-compliant CAD output: Generates as-built plans in DWG and DXF, with couplings and pipe runs identified and measurements simplified
- 3D digital twin and GIS export: Produces a model of the pipe route including building entries that drops into existing GIS systems
- Works without GPS: Captures basement sections and building entry points where GNSS-based surveying fails
- Immediate backfilling: Because capture takes minutes, trenches close right after filming instead of waiting on a survey crew
- Documentation in about 72 hours: Complete records arrive weeks earlier than conventional surveying, enabling prompt connection billing
- Third-party utility capture: Records crossing utilities and as-laid geometry as unbroken 3D evidence, replacing hand sketches
Best for
- A utility network operator documenting residential service connections without booking a surveyor for every site
- A contractor closing a trench the same day instead of leaving it open pending a survey appointment
- Capturing a building entry point in a basement where GPS-based surveying cannot get a fix
- A district heating project producing as-built DWG plans for regulatory sign-off
- Spotting a laying error in the 3D point cloud before backfilling, while the fix is still cheap
- Feeding as-built pipe geometry into a GIS system for long-term network maintenance planning