Honest comparison
Decize vs Decision Log (decisionlog.ai)
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Choose Decision Log if you need a strict system of record that AI agents and developer tools read and write through an API, CLI or MCP, with immutable decisions and explicit supersession. Choose Decize if your team decides in email and the gap is follow-through: owners, deadlines, outcomes and whether confident calls work out.
What Decision Log (decisionlog.ai) is
Decision Log describes itself as the durable system of record for decisions made by people and AI agents. Decisions are immutable; a change creates a new decision linked by supersession, with rationale, actor attribution and source provenance. It offers a web app plus GraphQL, REST, CLI and MCP access, and says it is not a project manager, wiki or chat tool.
Side by side
| Decize | Decision Log (decisionlog.ai) | |
|---|---|---|
| How decisions get captured | Decize: Forward or Cc an email to your workspace address, type it in plain language, or import a document. Decize drafts the fields and saves the record. | Decision Log (decisionlog.ai): Web app, GraphQL or REST API, CLI and MCP. AI-extracted decisions arrive as candidates a person reviews before activation. |
| Built for | Decize: Teams whose decisions happen in email threads, including people who never open an account. | Decision Log (decisionlog.ai): People and AI agents. Its pages address organizations, product teams, developers and AI-agent operators. |
| Changing a decision | Decize: A decision that replaces or reverses an earlier one is logged as a new record, and once a person confirms, the earlier one keeps its reasoning, marked Replaced, with a link to the new one. The ledger shows what is still in force. Status, owner and deadline are edited in place, and owners and managers can delete a decision outright. | Decision Log (decisionlog.ai): Decisions are immutable. A change is a new decision with an explicit supersession link and an audit event. |
| Follows up on outcomes | Decize: Deadline reminders, then an outcome email about two weeks after its deadline (or after it was logged, if it has none), except in a few cases, such as a replaced decision. It goes to the owner, or to whoever logged it by email or in the web app. Tap an answer, then Save; no login. | Decision Log (decisionlog.ai): Not described on its homepage, pricing page or agent instructions. |
| Forecasts and calibration | Decize: Optional confidence on each decision, in words, counted only once a person confirms it. The dashboard’s calibration chart and the Brier score need the team to have recorded 50 outcomes; the Brier score is on Business and also needs 5 decisions with a confirmed confidence and an outcome. | Decision Log (decisionlog.ai): Not described on its homepage, pricing page or agent instructions. |
| Pricing model | Decize: Per decision, never per seat: $0 for 10 a month, $99 for 50, $249 for 200. Unlimited people on every plan. | Decision Log (decisionlog.ai): Individual: free, one user, 10,000 agent operations a month. Team: $10 per user a month or $40 per user a year, plus metered operations. |
| Integrations | Decize: Its own web app plus your email. No Slack app yet. AI assistants connect over MCP with a key the owner creates: they read what is in force, who owns it and how it went, and anything they suggest waits for a person to keep it. | Decision Log (decisionlog.ai): API, CLI, MCP, an SDK and an agent plugin. Its pages mention no Slack, email or meeting integration. |
| Access model | Decize: Every member reads the whole ledger; there are no private decisions. No leaderboard, and no per-person score anyone else can see. | Decision Log (decisionlog.ai): Organization roles and permissions on Team, scoped and revocable machine credentials, and append-only audit events. |
Choose Decision Log (decisionlog.ai) if
- AI agents need to write decisions directly, without a person keeping each one.
- You need immutable records and an append-only audit trail.
- Your team is comfortable working through an API, a CLI or MCP clients.
- You want a free single-user plan for personal or developer use.
Choose Decize if
- Decisions happen in email and you want them captured by forwarding or Cc.
- You want owners reminded before deadlines and asked how each decision turned out.
- You want forecast calibration built up over time.
- You want unlimited people at a price set by decision volume, not seats.
Sources: Decision Log homepage · Decision Log pricing · Decision Log agent instructions (llms.txt) · Decision Log for teams