Head to head · Personal transactions · October 2026 research run
Plum vs YNAB
YNAB scores 65.1 (B) on agent readiness against Plum's 27.4 (F), and leads in 6 of 7 scored categories. Both do personal transactions.
Best subscription, bill and budgeting tools for AI agents · All 43 personal finance comparisons
Which one, for what
Plum F
Best for UK and European users who want saving and investing automated from their spending.
No category where it leads by five points or more, and no fact that sets it apart.
Watch for
No public API or MCP server an outside agent can call.
YNAB B
Best for An agent helping one person with their own YNAB plan, reading spending and editing categories, transactions and targets.
Ahead on
- Reliability, 82 against 60
- Schema & documentation, 77 against 10
- Agent ergonomics, 71 against 0
- Security & auth, 51 against 0
- Maintenance & community, 62 against 56
- Transparency & trust, 75 against 58
Also in its favour
- A hosted endpoint, with nothing to install
- Free to start without a card
Watch for
Each access token is limited to 200 requests an hour in a rolling window, and 429 responses carry no Retry-After
Score by category
| Category | Weight this run | Plum | YNAB | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 60 | 82 | YNAB +22 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 10 | 77 | YNAB +67 |
| Agent ergonomics | 13%16.2 | 0 | 71 | YNAB +71 |
| Security & auth | 14%17.5 | 0 | 51 | YNAB +51 |
| Payments & pricing | 10%12.5 | 30 | 30 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 56 | 62 | YNAB +6 |
| Transparency & trust | 7%8.8 | 58 | 75 | YNAB +17 |
| Negative events | ≤15 | 0 | 0 | |
| Total | F 27.4/100 | B 65.1/100 |
Facts side by side
| Fact | Plum | YNAB |
|---|---|---|
| Kind | Platform | HTTP API |
| Vendor | Plum Fintech Limited | YNAB |
| Hosted endpoint | no (local only) | https://api.ynab.com/v1 |
| Transports | HTTP | |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Closed service under Plum's terms (Plum Fintech Limited and Saveable Limited) | Proprietary service; SDKs Apache-2.0 |
| Tools exposed | none | 0 |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Last release | 2026-10-12 | 2026-09-17 |
| Terms last updated | 2026-07-15 | 2026-04-09 |
| Privacy policy last updated | no date given | 2026-04-09 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 240 stars, 9.6k npm/wk, 2.3k PyPI/wk |
Verdicts
Plum
Plum automates saving and investing for UK and European users from their bank data, with a free tier, public prices, a status page and weekly iOS releases. There is no public API or MCP server an outside agent can call, and its AI tools run only inside the app. No security contact was found.
YNAB
A public OpenAPI 3.1.1 file, a dated changelog and an OAuth read-only scope let an agent read and edit a person's own budget. Each token is limited to 200 requests an hour with no Retry-After, personal access tokens never expire and have no read-only option, and access always starts with a person signing up in a browser.
Before you call either
Plum
- Don't plan to call Plum from another agent. Hand the task to the person in the Plum app.
- Plum moves real money between accounts and investments, so leave any change to automations or withdrawals to the person.
YNAB
- Use last-used in place of plan_id until you have listed plans with GET /v1/plans
- Store server_knowledge and send it back as last_knowledge_of_server to stay inside 200 requests an hour
- Read and write amounts in milliunits, or read the _currency fields added in v1.82.0
- Set import_id on transactions you create so a retried POST is matched instead of duplicated
- Request scope=read-only on OAuth when the task only reads the budget
Questions
Which is better for AI agents, Plum or YNAB?
YNAB scores 65.1 (B) on agent readiness against Plum's 27.4 (F), and leads in 6 of 7 scored categories.
Can an agent call Plum and YNAB without installing anything?
No hosted endpoint is listed for Plum. YNAB has a hosted endpoint at https://api.ynab.com/v1.
Other comparisons with Plum or YNAB
Machine-readable
- This page as Markdown
/compare/plum-vs-ynab.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/plum.json·/api/v1/tools/ynab.json - From a terminal
anchor compare plum ynab(the CLI) - Over MCP
compare_tools {"a": "plum", "b": "ynab"}at/mcp, no key