Ternary vs Costory

Costory is our product.

The short answer

Choose Ternary if: you want a finance-owned ledger of technology spend (cloud, SaaS and AI) mapped to cost centers and your ERP, for CFO and FP&A teams.

Choose Costory if: you want allocation and explanations for engineering and FinOps teams, answers inside Slack and your AI assistant, and a flat published price.

Side by side

Where Ternary is strong

Ternary describes a Finance-owned ledger across AI, SaaS, cloud and on-premise spend, mapped to cost centers, GL codes and your ERP chart of accounts, and queryable over MCP. That fits finance-led organizations that want technology spend to reconcile with the general ledger.

Where Costory is different

• Allocation first: Virtual Dimensions map accounts, projects, labels and tags to teams and features, even with incomplete tagging.

• Explanations, not just numbers: cost changes are shown next to deploys, incidents and usage metrics.

• Works where your team already is: Slack digests and alerts in the channel you choose (for example #finops), and Claude, Claude Code, Cursor and Grok Bot via MCP.

• Flat pricing: Copilot €250/month, Copilot Pro €1,000/month, billed annually, with a 30-day free trial and a connection in under 30 minutes.

What Costory does not do

• It does not buy Reserved Instances or Savings Plans for you.

• It does not apply automated rightsizing.

• It does not get write access to your cloud accounts (MCP actions create Costory objects only: alerts, reports, dashboards, events).

Can you use both?

Yes, they can sit side by side. Some teams use a finance-owned ledger for reconciliation and Costory for engineering-level allocation, deploy context and AI-assisted investigations. Costory is read-only on your cloud accounts: its actions create alerts, reports, dashboards and events in Costory only.

FAQ

Should I use Ternary or Costory?

It depends. Ternary fits finance-led teams that want a ledger of technology spend (cloud, SaaS and AI) mapped to cost centers and their ERP. Costory fits engineering and FinOps teams that want allocation and explanations inside Slack and their AI assistant, at a flat published price.

How does Ternary's pricing compare with Costory's?

See Ternary for current pricing. Costory has two flat plans, Copilot at €250/month and Copilot Pro at €1,000/month, billed annually, with a 30-day free trial.

Can I use Ternary and Costory together?

Yes, they can sit side by side. Some teams use a finance-owned ledger for reconciliation and Costory for engineering-level allocation, deploy context and AI-assisted investigations. Costory is read-only on your cloud accounts: its actions create alerts, reports, dashboards and events in Costory only.

How long does Costory take to set up, and where is my data hosted?

Under 30 minutes to connect your billing exports and the MCP, with Terraform or CloudFormation. Your first recommendation comes the next day, once the first billing data lands. A 30-day free trial is available. Costory hosts customer data in the EU, and access to your cloud accounts is read-only (billing and usage exports).