Build AI systems that grow with you.
Smarter agents means time saved. Sibyl Memory learns the nuances of your work, and allows any model to achieve higher performance.
$108 a year Save $36 a year works out to $9 a month
What the two tiers give you.
Both tiers plug into the AI tool you already use: Claude Code, Hermes, Cursor, LangGraph or any MCP client.
| Feature | Free$0 | Pro$108 a yearworks out to $9 a month |
|---|---|---|
| Storage | About a month of work (5 MB) | No cap |
| Computers | 1 computer | Up to 10, one account |
Save and debloatisave writes the session to memory; debloat moves old history out of your instruction files into memory |
Manual, with reminders | Automatic |
Skill suggestionsiworkflows you repeat, offered back as skills you can accept or reject |
No | From your own sessions |
Self-learningirecall ranks the facts and phrasings you use most, so results get closer to what you meant |
No | Yes |
Memory linteriflags stale, contradictory or oversized entries in your store |
No | Yes |
| Price | Free | $108 a year (works out to $9 a month), or $12 a month billed monthly |
| Refunds | Nothing to refund | All sales are final. Cancel any time to stop the next renewal. |
| Get started | Try Free | Get Pro, annual, $108 a year |
- Storage
- No cap
- Computers
- Up to 10, one account
- Save and debloat
i
save writes the session to memory; debloat moves old history out of your instruction files into memory
- Automatic
- Skill suggestions
i
workflows you repeat, offered back as skills you can accept or reject
- From your own sessions
- Self-learning
i
recall ranks the facts and phrasings you use most, so results get closer to what you meant
- Yes
- Memory linter
i
flags stale, contradictory or oversized entries in your store
- Yes
- Price
- $108 a year (works out to $9 a month), or $12 a month billed monthly
- Refunds
- All sales are final. Cancel any time to stop the next renewal.
- Storage
- About a month of work (5 MB)
- Computers
- 1 computer
- Save and debloat
i
save writes the session to memory; debloat moves old history out of your instruction files into memory
- Manual, with reminders
- Skill suggestions
i
workflows you repeat, offered back as skills you can accept or reject
- No
- Self-learning
i
recall ranks the facts and phrasings you use most, so results get closer to what you meant
- No
- Memory linter
i
flags stale, contradictory or oversized entries in your store
- No
- Price
- Free
- Refunds
- Nothing to refund
Install and sign in. Then your agent remembers.
Install
One command installs the CLI and the MCP connector in their own environment, puts them on your PATH, and offers to connect Claude Code, Codex and Hermes for you. Cursor and other MCP clients connect through their MCP settings. Runs on Linux and macOS; on Windows, run it inside WSL2. Native Windows is not supported.
Activate
sibyl init opens a sign-in page. Every plan, free included, runs on an account: sign in with your email and a one-time code, or connect a wallet and add your email. Bought Pro first? Run sibyl claim <checkout code> with the checkout code from your receipt email and the purchase attaches to the account.
Memory grows
Your agent saves what matters as you work, and recalls it in the next session. Projects, people, decisions, the reason something was done the way it was. On Pro, saving happens on its own. Run sibyl status any time to see your plan and where your memory lives.
# 01 install, then say yes to connecting your AI tools
$ curl -fsSL https://sibyllabs.org/install | sh
# open a new terminal if sibyl is not found yet
# 02 sign in: email or wallet
$ sibyl init
# bought Pro first? attach it
$ sibyl claim <checkout code>
# 03 check your plan and memory
$ sibyl statusPrefer to install with pip, or setting up another MCP client? The install docs cover both. Needs Python 3.10 or later.
Start free. Go Pro when you outgrow it.
Stake 100,000 $SIBYL or more in the $SIBYL staking contract and connect that wallet to your account, on the accounts page or by running sibyl init. Pro switches on within the hour, or at once with sibyl refresh, and future product access follows automatically. If your stake drops below the line, Pro stays on for 7 more days.
Measured, not claimed.
- 95.1% on LongMemEval, a public test of long-term memory, with the plugin on Sonnet 4.5.1
- An outside tester reproduced it: about 95.2%, on a rule-based judge.2
- 0 bytes of memory content leave your machine.3
- The server sees your tier, never what you remember.
- In an independent 350-question test across four memory engines, it found the right record all 350 times and answered 344 correctly, for $0.64 in total.4
No ceiling.
Free holds about a month of work (5 MB). Pro removes the cap, so a year of projects, people and decisions stays with you.
It saves itself. About once an hour of real work.
On Pro, Claude Code saves your session on its own: once early, then about every hour you are actually working. On Hermes, Cursor and Codex the plugin asks your agent to save at the same moments. Change the interval or turn it off with sibyl autosave.
Lean instruction files. The history moves into memory.
At the start of a session Pro measures CLAUDE.md, AGENTS.md and the other files your agent loads every time, and proposes moving old history out of them and into memory, where it stays searchable. Nothing moves until you say yes, except in files you pre-authorise.
Skills from your own work.
Pro notices the workflows you repeat and offers them as skills at the start of a session. Detection runs on your machine, and nothing is written until you accept it.
It learns what you look for. Recall improves as you work.
Pro promotes the facts your agent reaches for again and again, and learns the phrasings you search with. The next session starts closer to what you meant.
A linter for memory. Bad entries get caught early.
The linter reads your store the way a linter reads code. It flags what went stale, facts that contradict each other, and notes that grew past their use.
Where does my memory live?
On your machine, in a local database you can open, copy and back up. Pro lifts the limits; it never moves your data.
Does Pro sync memory between my computers?
No. Each computer keeps its own local store. Pro lets one account run on up to 10 computers, and nothing you remember leaves the machine it was saved on.
What phones home?
Entitlement checks and anonymous operation counts. 0 bytes of memory content leave your machine. The server knows which tier your account is on and how many operations ran, never what you remembered. Skill suggestions are found on your machine and never sent.
Do I need an account on the free plan?
Yes. Every plan starts with sibyl init and a free account, which is how the plugin knows your tier. Your memory still stays on your machine.
Can I use Free on a second computer?
Free covers one computer. Signing in on a new one offers to sign the old one out, and nothing stored on either is deleted. Pro covers up to 10.
Does automatic save cost anything?
Each automatic save is one extra model turn that reads and writes memory, on your own model plan. Set it anywhere from every 30 to every 240 minutes, or turn it off, with sibyl autosave.
Can I cancel?
Cancel any time from the billing page on your account. The period you already paid for runs out, nothing renews, payments already made are not refunded, and nothing is deleted when Pro lapses. The free-tier cap applies to new writes again, and automatic save and debloat switch off.
Can I buy before I install?
Yes. Buy first, install when you are ready, then run sibyl claim <checkout code> with the checkout code from your receipt email. The purchase attaches to whichever account you activated, by wallet or by email.
Is it open source?
Yes. The memory engine and the plugin are on GitHub at github.com/Sibyl-Labs/Sibyl-Memory. Read the code that runs on your machine before you install it.
Memory your agent keeps.
$108 a year works out to $9 a month
Or start free: 5 MB, one computer, no card.
Checkout needs JavaScript. sibyl upgrade in your terminal works without it.
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Nothing is deleted if Pro lapses. Your memory stays where it is; the free cap applies to new writes again.
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Prices are before tax; tax is added at checkout where it applies. All sales are final: cancel any time to stop the next renewal and keep Pro to the end of the paid period. Card payments run through Stripe, and no card details touch our servers.
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Prefer to pay another way?
sibyl upgradein your terminal offers USDC at the same price. A USDC payment covers a set period and does not renew. -
Stake 100,000 $SIBYL or more in the $SIBYL staking contract and connect that wallet to your account, on the accounts page or by running sibyl init. Pro switches on within the hour, or at once with sibyl refresh, and future product access follows automatically. If your stake drops below the line, Pro stays on for 7 more days.
- 1LongMemEval Oracle, the plugin on Sonnet 4.5. 95.1% leaves out the 30 preference questions (447 of 470 correct); across all 500 questions it is 90.6%. blog.sibylcap.com/plugin-longmemeval back
- 2Independent reproduction, bounty B003, 2026-06-26. Rule-based judge, run against the published plugin. back
- 3Syscall-traced by an independent tester. blog.sibylcap.com/beta-analysis back
- 4Independent beta-tester run: 500 companies over 365 simulated days, answers by Claude Sonnet 4.6, the tester's own run on each system. agent-bench.xyz back