Cloud bills rarely go down on their own — a team spins up resources to ship fast, nobody goes back to right-size them, and six months later finance is asking why the AWS invoice doubled. The tools in this guide all attack that problem from a different angle: some watch Kubernetes clusters and resize them automatically, some buy the discount commitments most teams never get around to managing, and some just scan for obvious waste and open a ticket. None of them are free at meaningful scale, and none of them publish real pricing, but the mechanics of what they actually do are worth understanding before a sales call.
The tools compared at a glance
| Tool | What it actually does | Pricing model | Best for |
|---|---|---|---|
| IBM Cloudability (Apptio) | Allocates 100% of cloud spend to teams/features for finance+eng visibility | Quote-based, 3 tiers | FinOps/Finance needing shared cost accountability |
| Cast AI | Auto-resizes and reschedules Kubernetes workloads, including GPUs | Quote-based | Enterprise teams running Kubernetes at scale |
| nOps | Automates Reserved Instance/Savings Plan buying + hourly cost breakdown | Share of Savings or Fixed Fee | Multi-cloud teams not managing discounts today |
| Sedai | Continuously tunes scaling/cost/availability via reinforcement learning | Quote-based, usage-tied | SRE/platform teams comfortable with autonomous prod changes |
| Cloudtellix | Scans AWS for waste, opens a verified-fix ticket in your tracker | Free (beta) | Teams wanting a low-commitment first pass at AWS waste |
IBM Cloudability (Apptio) — the shared-visibility layer
Cloudability's job isn't to change infrastructure at all — it's to end the argument between finance and engineering about where cloud money actually goes, by allocating 100% of costs down to teams and features instead of leaving a chunk as "unallocated shared costs" nobody can explain.
Who it's for: FinOps, DevOps, Finance IT, and leadership who need one shared, trusted number rather than each team pulling its own spreadsheet.
Price: quote-based across three tiers (Essentials/Standard/Premium), no public figures.
Honest limits: no self-serve signup — it's an enterprise sales process — and Apptio/IBM don't publish pricing anywhere, so you're negotiating blind going in. It also doesn't optimize anything itself; it's visibility, not automation.
Verdict: the right starting point if your actual problem is "we can't agree on what's costing what," not "we already know and need it fixed."
Cast AI — hands-off Kubernetes rightsizing
Cast AI watches Kubernetes clusters continuously and resizes, reschedules, and cost-optimizes workloads — including GPU workloads — instead of an engineer guessing at instance sizes and revisiting them quarterly if at all.
Who it's for: DevOps, SRE, and FinOps teams running Kubernetes at real scale, especially with GPU spend to control.
Price: quote-based, customized by cluster count, GPU usage, and product mix.
Honest limits: zero public pricing, and it's Kubernetes-specific — if your workloads aren't containerized on K8s, this tool has nothing to offer you.
Verdict: a strong pick specifically for Kubernetes-heavy shops; irrelevant otherwise.
nOps — automates the discounts teams forget to manage
Most teams either skip Reserved Instances and Savings Plans entirely or manage them badly by hand because it's tedious and easy to get wrong. nOps automates buying and managing those commitments, and breaks spend down hour by hour instead of leaving you to parse one confusing monthly bill.
Who it's for: startups to enterprises with meaningful multi-cloud spend who aren't actively managing discount commitments today.
Price: either Share of Savings (a percentage of what it saves you) or a quote-based Fixed Fee, with a 14-day trial.
Honest limits: exact pricing isn't public until you talk to sales, and it's narrower in scope than a full FinOps platform like Cloudability — it's specifically about discount automation and spend breakdown, not organization-wide cost allocation.
Verdict: the most immediately quantifiable ROI on this list, since Share of Savings pricing means it only costs you money if it actually saves you money.
Sedai — autonomous tuning via reinforcement learning
Instead of an engineer writing static autoscaling rules that go stale as traffic patterns change, Sedai watches how applications actually behave and adjusts scaling, cost, and availability on its own using reinforcement learning, across AWS, Azure, and GCP.
Who it's for: SRE and platform engineering teams managing multi-cloud at scale who are comfortable letting a system make autonomous production changes.
Price: quote-based, tied to cloud environment and usage, with a 30-day free trial.
Honest limits: no public pricing, and the core value proposition — autonomous prod changes — requires a real trust threshold that not every team is ready to cross, no matter how good the trial period looks.
Verdict: worth the 30-day trial if your team already trusts automated remediation elsewhere; a harder sell if this would be your first autonomous-ops tool.
Cloudtellix — the low-commitment first pass
Cloudtellix takes a narrower approach than the rest of this list: it scans an AWS account for wasted spend using read-only IAM access (no permanent keys required), verifies the recommendation with actual metrics, and opens a ticket directly in GitHub, Linear, Slack, Trello, or Jira — rather than adding yet another dashboard alert nobody acts on.
Who it's for: engineering teams and startups who want to find obvious AWS waste without a sales call or a new dashboard to check daily.
Price: free during the current beta; no public pricing for after.
Honest limits: it's beta software with reliability and longevity still unproven, there's no pricing commitment for later, and it only covers AWS — no GCP or Azure support mentioned.
Verdict: the easiest of the five to just try today, precisely because it's free and asks for read-only access rather than a contract.
Which one should you actually pick?
If the real problem is a lack of shared visibility between finance and engineering, start with Cloudability — it won't touch your infrastructure, but it will end the spreadsheet arguments. If you're specifically bleeding money on Kubernetes, Cast AI is the direct fit. If nobody on your team has gotten around to buying Reserved Instances or Savings Plans, nOps is close to free money given its Share of Savings pricing. Sedai is the most ambitious of the five — worth it if you're already comfortable with autonomous production changes elsewhere — and Cloudtellix is the lowest-risk way to find out if you even have a waste problem worth solving before committing to any of the others.
Every tool here is quote-based except Cloudtellix's current free beta, so the real evaluation work — getting an actual number — happens in a sales conversation, not on the pricing page. Budget for that conversation as part of the decision, not an afterthought.