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AI · head to head

Atlas Cloud vs Fly.io

Atlas Cloud logo

Atlas Cloud

AI

One API for 500+ image, video, LLM and audio models

From
On request
Free plan
No
Full reviewWebsite
Fly.io logo

Fly.io

Cloud

Deploy web applications globally

From
$29/month
Free plan
No
Full reviewWebsite

The short version

  • Each has a real cost: Atlas Cloud not every model accepts every request format. Each model publishes its own supported_apis list, and Gemini models expose their full multimodal capability only on the native Gemini format, so 'change the base URL' does not hold for every model.; Fly.io egress is priced by destination region, from $0.02 per GB in North America and Europe to $0.12 per GB for Africa and India, so the same traffic costs six times more depending on where users are
  • They diverge on capability: Atlas Cloud covers 500+ models, one API key, Fly.io covers Global deployment.
  • Prices and features above were last checked on 12 November 2026.

Where they differ

Only the attributes on which Atlas Cloud and Fly.io actually diverge.

Attributes where Atlas Cloud and Fly.io differ
AttributeAtlas CloudFly.io
Starting priceOn request$29/month
Platformsweb, apiWeb, Api, Docker
CategoryAICloud
FoundedUnknown2020

Identical on both: pricing model (usage-based), free tier (No), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Atlas Cloud

  • 500+ models, one API key
  • OpenAI-compatible LLM endpoint
  • Pay-as-you-go pricing
  • ComfyUI nodes
  • MCP server and CLI
  • Playground and Generator
  • Streaming, batch and webhooks
  • Coding Plan

Only in Fly.io

  • Global deployment
  • Docker support
  • Postgres databases
  • Redis support
  • Auto-scaling
  • Health checks
  • Backups
  • Monitoring

What people use each for

The jobs each tool is most often brought in to do.

Atlas Cloud

  • Adding AI image or video generation to an app without an account at each model providernot Fly.io
  • Switching an existing OpenAI, Anthropic or Gemini SDK integration to other models by changing the base URLnot Fly.io
  • Running hosted image and video models inside ComfyUI workflows without a local GPUnot Fly.io
  • Comparing image and video models side by side in a playground before committing to onenot Fly.io
  • Giving coding agents access to open-weight LLMs on a flat-rate plannot Fly.io

Fly.io

  • Deploying containerised applications close to users across regionsnot Atlas Cloud
  • Running full stack apps and databases on managed machinesnot Atlas Cloud

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Atlas Cloud

  • Not every model accepts every request format. Each model publishes its own supported_apis list, and Gemini models expose their full multimodal capability only on the native Gemini format, so 'change the base URL' does not hold for every model.
  • No Anthropic models were listed when checked in November 2026: the provider directory showed Anthropic with 0 models, so the Anthropic Messages format is a compatibility layer for other models rather than access to Claude.
  • The model count is stated inconsistently across the site: the homepage title says 400+, the vendor says 500+ and the pricing page listed 550, which makes it hard to know what is available without checking the live list.
  • Billing is prepaid. When the balance runs out new API requests are rejected with 402 Payment Required unless auto top-up is enabled, which matters for production workloads.
  • Most models are third-party models resold through the platform, so pricing and availability follow upstream providers and change often; prices on the pricing page are shown against a separate official price and discounts vary by model.

Fly.io

  • Egress is priced by destination region, from $0.02 per GB in North America and Europe to $0.12 per GB for Africa and India, so the same traffic costs six times more depending on where users are
  • Stopped machines still bill at $0.15 per GB of root filesystem a month, so a paused service is not a free one
  • Volumes are billed on provisioned capacity rather than usage, at $0.15 per GB a month
  • Reservation discounts of 40% require paying a year up front, from $36 to $1,440
  • Fly Kubernetes is a separate $75 a month per cluster
  • Dedicated IPv4 addresses are $2 a month each

Pricing, plan by plan

Atlas Cloud

On request
  • Pay-as-you-go$undefined/usage
    • Billed per image, per second of video or per token; no subscription
    • GPT Image 2 text-to-image: $0.004 per image
    • Seedream 5.5 generation or edit: $0.02 per image
  • Coding Plan$undefined/month
    • Monthly subscription with a monthly total and a weekly limit
    • Or 90-day pay-as-you-go credit packs with no weekly cap
    • Open-weight LLMs including GLM, MiniMax, Kimi and DeepSeek
  • Enterprise$undefined/custom
    • Volume API discounts
    • SLA options through sales
    • Dedicated infrastructure and private hosting on request

Fly.io

$29/month
  • Pay-as-You-Go$null/mo
    • Micro VMs and persistent storage charged by usage
    • FlyCTL CLI
    • Unlimited users and organizations
  • Serious Support$29/month
    • Access to dedicated engineering team
    • All Pay-as-You-Go features
  • Machine Reservation Blocks$null/mo
    • 40% discount on machine usage
    • Requires upfront payment for savings
  • Compliance Package$99/month
    • HIPAA compliance
    • BAAs
    • SOC2 documentation

Which should you pick?

Choose Atlas Cloud if

  • You need 500+ models, one api key.
  • You work on web, api.
  • You also want openai-compatible llm endpoint.
Atlas Cloud review

Choose Fly.io if

  • You need global deployment.
  • You work on Web, Api, Docker.
  • You also want docker support.
Fly.io review

Questions people ask

Is Atlas Cloud or Fly.io better?
Neither clearly leads. Atlas Cloud starts at On request and Fly.io at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Atlas Cloud or Fly.io?
Atlas Cloud starts at On request and Fly.io at $29/month.
Does Atlas Cloud or Fly.io run on more platforms?
Atlas Cloud runs on web, api. Fly.io runs on Web, Api, Docker.
What is Atlas Cloud best used for?
Atlas Cloud is most often used for adding ai image or video generation to an app without an account at each model provider, switching an existing openai, anthropic or gemini sdk integration to other models by changing the base url, running hosted image and video models inside comfyui workflows without a local gpu, comparing image and video models side by side in a playground before committing to one. Of those, adding ai image or video generation to an app without an account at each model provider and switching an existing openai, anthropic or gemini sdk integration to other models by changing the base url are not what Fly.io is typically brought in for.
What can Atlas Cloud do that Fly.io cannot?
Atlas Cloud covers 500+ models, one API key, OpenAI-compatible LLM endpoint, Pay-as-you-go pricing, ComfyUI nodes. Fly.io covers Global deployment, Docker support, Postgres databases, Redis support.

Answered from the vendors’ own pages

Atlas Cloud: How is Atlas Cloud priced?

Pay as you go, per image, per second of video or per token, drawn from a prepaid balance with no subscription required. Examples in November 2026 were $0.004 per image for GPT Image 2 text-to-image, $0.02 per image for Seedream 5.5 and from $0.11 per second for Kling 4.0. Enterprise volume discounts are available through sales.

Source
Fly.io: Is there a free tier for Fly.io?

Fly.io does not advertise a free tier. The base plan is pay-as-you-go with usage-based pricing for Micro VMs and persistent storage. All users get FlyCTL CLI, unlimited organizations, private networking, SSO, ACLs, and scoped tokens.

Source
Atlas Cloud: Is the Atlas Cloud API OpenAI-compatible?

Yes. The base URL https://api.atlascloud.ai accepts OpenAI Chat Completions, Completions, Responses and Images requests, Anthropic Messages and Google Gemini requests with the same API key. Not every model supports every format; each model publishes a supported_apis list.

Source
Fly.io: How much does Fly.io Serious Support cost?

Serious Support costs 29 USD per month and provides access to a dedicated engineering team while maintaining all pay-as-you-go features for Micro VMs and storage.

Source
Atlas Cloud: Can I use Atlas Cloud in ComfyUI?

Yes. The Atlas Cloud ComfyUI nodes, installed from the AtlasCloudAI/atlascloud_comfyui GitHub repository, call hosted models from a ComfyUI graph. Generation runs on Atlas Cloud, so large video and image models work without a local GPU.

Source
Fly.io: What does Fly.io Compliance Package include?

The Compliance Package is 99 USD per month and includes HIPAA compliance, BAAs, and SOC2 documentation for organizations requiring compliance certifications.

Source
Atlas Cloud: What happens when my balance runs out?

New API requests are rejected with 402 Payment Required and you receive low-balance notifications. Service resumes as soon as you top up, and auto top-up can be enabled to avoid interruptions.

Source
Fly.io: Does Fly.io offer discounts for upfront commitment?

Yes, Fly.io offers Machine Reservation Blocks with 40% discount on machine usage. This requires upfront payment but applies savings on infrastructure costs.

Source
Atlas Cloud: What is the Atlas Cloud Coding Plan?

A set of flat-rate subscriptions and 90-day credit packs for open-weight LLMs such as GLM, MiniMax, Kimi and DeepSeek, designed for coding agents including Claude Code, Codex and Cursor. Monthly subscriptions carry a weekly limit that resets every Monday.

Source
Atlas Cloud: Where is Atlas Cloud based?

Its headquarters are at 1540 Broadway, New York, with offices in Silicon Valley and Calgary.

Source
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