Build models that you trust.
Build a custom model for your app. Deploy on-device. Zero per-inference cost.
Build your AI model. Visually.
How it works
From your data to on-device AI in three steps.
Upload your dataset
Upload your JSONL training dataset through our web interface. Don't have a dataset? Import one directly from Hugging Face using a URL.
Fine-tune in Studio
Fine-tune multiple models simultaneously on fast cloud GPUs, no expensive hardware needed. We save the knowledge of your fine-tuned models, enabling iterative testing across different use cases.
Ship in Your App
Export your fine-tuned model as GGUF and ship it in your iOS, Android, or desktop app. Run inference on-device with llama.cpp. Zero per-token cost, works offline.
Inside the platform
Everything you need to fine-tune and ship custom AI.
Model Studio
Fine-tune popular open-source models on fast cloud GPUs. Supports Gemma 4, Llama 3.2, Qwen 3.5, and more. Visual canvas, no code required.
See supported models →
Why fine-tune your own model?
Custom models give you capabilities that prompting a generic LLM can't match.
Models that understand your domain
Fine-tuned models outperform generic LLMs at your specific tasks, better than any prompt engineering.
Costs that don't scale with your users
Cloud APIs charge per token, and your bill grows with every user. On-device inference costs nothing at runtime, whether you have 1,000 users or 100,000.
Ship AI features without ML expertise
Ertas handles the training pipeline. You focus on your product, not infrastructure.
On-device: offline, instant, private
No network round-trip, no loading spinners, no data leaving the device. Your AI features work everywhere, even offline.
Built for app builders who ship AI-powered products: indie devs, startups, agencies, and solo builders.
"I fine-tuned a model on our product docs in under an hour. Now our support bot actually understands our domain instead of hallucinating."
Jamie K.
Indie Developer
"Replaced our $400/mo API bill with a fine-tuned model running locally. Better results, predictable costs. Exactly what we needed."
Maria R.
Startup Founder
Built for how you work
Start free. Scale as you grow.
Free
Try it out, 30 credits/mo
- 5 daily-refreshed credits/day (up to 30/mo)
- Models under 5B
- 5 GB model storage
- 250 MB dataset storage
- Manual testing sandbox
Builder
For indie devs and solo builders
- 100 credits/mo
- Up to 14B models
- 50 GB model storage
- 2 GB dataset storage
- Higher tier GPUs
- 1-month credit rollover
Pro
For power users and teams managing client work
- 200 credits/mo
- 100 GB model storage
- 5 GB dataset storage
- Priority GPU queue
- Preview access to new features
Business
For scaled teams and multi-client agencies
- 400 credits/mo
- 200 GB model storage
- 10 GB dataset storage
- Higher priority GPU queue
- Priority preview access to new features
Need compliance, on-prem, or frontier hardware? Talk to us about Enterprise
Frequently asked questions
Everything you need to know about Ertas AI.
Start building today.
Free to start. No card required.