Pricing
Pricing for wherever it runs.
One plan covers kosa8 on your own machines and on kosa8 Cloud: every plan includes Cloud credit each month. Enterprise covers sites with no network at all. Every plan starts with a 14-day trial.
Solo
$29/month
For one person with one assistant running.
- Sandboxes & secure agent runs
- Save & undo
- Dashboard
- Local models
4 at once64 GB sandboxes
+ $10 of kosa8 Cloud every month
Start free trialPro recommended
$89/month
For one person driving a fleet of assistants.
- Everything in Solo, plus
- Explore
- Assistant
16 at once128 GB sandboxes
+ $25 of kosa8 Cloud every month
Start free trialTeam
$169/person /month
For a team with someone accountable for security. From 3 people.
- Everything in Pro, plus
- Governance & MCP policies
- Seats for the whole team
48 shared256 GB sandboxes
+ $40 a person of kosa8 Cloud every month
or $1,690 a person a yearsave $338 a person
Start free trialScale
$199/person /month
For large fleets that need capacity held for them. From 5 people.
- Everything in Team, plus
- Capacity held for you
- The largest sandboxes
160 shared500 GB sandboxes
+ $50 a person of kosa8 Cloud every month
or $1,990 a person a yearsave $398 a person
Start free trialCompare every plan.
Where each plan runs, the kosa8 Cloud it includes, and its limits, side by side with using kosa8 Cloud with no plan and Enterprise.
| Plan | Your computer | Own hosts (BYOC) | kosa8 Cloud | Cloud credit each month | Copies at once | Sandbox size |
|---|---|---|---|---|---|---|
| Solo$29/monthSandboxes & secure agent runs, save & undo, dashboard, local modelsStart free trial | ✓ | ✓ | ✓ | $10 | 4 | 64 GB |
| Pro recommended$89/monthEverything in Solo, plus Explore and AssistantStart free trial | ✓ | ✓ | ✓ | $25 | 16 | 128 GB |
| Team$169/person /monthEverything in Pro, plus Governance & MCP policies and seats for the whole teamStart free trial | ✓ | ✓ | ✓ | $40per person | 48 shared | 256 GB |
| Scale$199/person /monthEverything in Team, plus capacity held for you and the largest sandboxesStart free trial | ✓ | ✓ | ✓ | $50per person | 160 shared | 500 GB |
| No plan$0/monthSign up for kosa8 Cloud | — | ✓pay as you go | ✓pay as you go | $50 once at sign-up | your spending cap | |
| EnterpriseQuotedUnlimited, and air-gapped sites. Talk to us | contract | contract | contract | contract | unlimited | |
The Cloud credit pays for anything on kosa8 Cloud: sandboxes on our hosts, sleeping snapshots, functions, and $0.20 an hour for each of your own servers joined as a host. Usage past it is billed on the same subscription, at the rates below.
"At once" is how many copies (forks of a running sandbox) can run together; your ordinary sandboxes are not counted. Above the limit, copies run at $0.10 per copy-hour only if you turn on overage.
Every plan starts with a free 14-day trial. There is no permanently free tier — after the trial, kosa8 is paid software.
Need a bigger machine than your plan carries? Capacity add-ons raise any plan to 500 GB ($100 a month) or 1 TB ($200 a month) per sandbox — add one here. The disk is your own; what the add-on covers is saving, forking and pushing a sandbox that size.
kosa8 Cloud
Run it on our hosts, by the second.
Every plan above includes kosa8 Cloud credit each month: $10 on Solo, $25 on Pro, $40 a person on Team and $50 a person on Scale. Usage past the credit is billed on the same subscription at these rates. You can also use kosa8 Cloud with no plan: sign up, make an API key, and pay for what runs.
per vCPU-hour while a sandbox runs, billed per second.
per GB of RAM per hour while it runs.
per GB-month for a sleeping sandbox's snapshot. The next command wakes it.
per hour for each of your own servers joined as a host, with no compute charge for what runs on it.
Prices in the EU (Helsinki), the only region today; the US and Asia-Pacific will cost 1.2× when they open. A new organization gets $50 of credit once it adds a payment method. Where each way of running kosa8 keeps your code, and what it costs: local, cloud, your own hosts or air-gapped.
Enterprise & Government
Unlimited, everything, and it runs with no network at all.
Quotes, purchase orders, security reviews and procurement paperwork: write to contact@kosa8.com and a person answers.
Unlimited
copies at once, and sandboxes of any size.
Everything
every product, the Compliance Pack included.
FIPS 140-3
builds from a private, signed release channel, each with its bill of materials.
Offline
a signed site licence: no activation, no check-ins, no usage leaves the building.
Need more for a while?
Add it for as long as you need it.
per fork-hour: each copy running above your plan's limit, for each hour it runs — hourly overage, only if you turn it on with kosa8 license overage on. Billed with your plan, measured from your own audit log.
a month for the Compliance Pack: the evidence an assessor asks for, in one command.
Add the packto download your own data, because it costs us nothing.
On the plans, nothing is billed by the gigabyte. Their only hourly charge is overage, and only on a machine where you turned it on; otherwise the limits above are the ones kosa8 enforces, and the only ones you pay for.
Verify your own invoice.
kosa8 keeps a sealed record of everything it does, and your usage is calculated from that record — which lives on your computer, not ours. So you can recount it yourself, and we cannot quietly add to it later, because changing the record breaks a seal you can test.
kosa8 usage --days 30 usage since 2026-09-14 (631 audit entries) forks 22 peak concurrent forks 6 snapshots 24 restores 9 sandbox runs 41 overage fork-hours 3.25 at $0.10/hour audit chain verified — these figures are reproducible ↑ an example; yours is counted from the sealed log on your machine
Pricing, plainly
What you pay for, and what you don't.
What counts as a "copy"?
A copy is a fork: a live clone of a running sandbox, made with kosa8 fork. Plans count how many run at once. Your ordinary sandboxes are not counted.
What happens after the 14-day trial?
kosa8 does not lock you out of your own work: a sandbox keeps running, and can still be saved and undone. Copies, local models, Explore, the assistant and governance need a plan. There is no permanently free tier.
What if I need more copies for an hour, not a month?
Turn on overage (kosa8 license overage on) and copies above your plan's limit run at $0.10 each per hour, billed with your plan. For a whole day of heavy use, the $49 Burst Pass adds 32 copies for 24 hours. Neither happens unless you choose it.
How do I know the bill is right?
Usage, overage included, is counted from the tamper-evident audit log on your machine. kosa8 usage shows the same figures we bill, and kosa8 audit verify proves the log was not altered.
Does paying yearly change anything?
Only the price: paying yearly costs about 17% less on every plan. Same features, same limits.
Is there a hosted version?
Yes: kosa8 Cloud runs the same sandboxes on our hosts. Every plan includes Cloud credit each month ($10 on Solo up to $50 a person on Scale), and usage past it, or usage with no plan, is billed per second: $0.048 per vCPU-hour and $0.0154 per GB of RAM per hour in the EU, and $0.08 per GB-month while a sandbox sleeps. A new organization gets a $50 credit once a payment method is added, and your own servers can join as hosts for $0.20 an hour each. Where kosa8 runs compares the options.
Does a plan include kosa8 Cloud?
Yes. Each plan comes with kosa8 Cloud credit every month: $10 on Solo, $25 on Pro, and $40 or $50 a person on Team and Scale. Usage past it is billed per second on the same subscription, so there is one invoice. The credit starts with the first paid month. Bought a plan here before? Link its licence key in the kosa8 Cloud dashboard.
Can I run kosa8 Cloud on my own servers?
Yes. Join any Linux server you run as a host and kosa8 Cloud schedules your sandboxes onto it: $0.20 per host per hour, with no compute charge for what runs there, and your code never leaves your machines. How each way of running kosa8 compares.
Which computers does a licence cover?
Apple-silicon Macs and x86-64 Linux run sandboxes themselves, and Windows 11 on x86-64 does through WSL2 (preview). Anything else — an Intel Mac, Windows 10, JioOS — drives one of those with kosa8 worker join.
More questions, answered: isolation, keys, data and compliance, GPUs, and where it runs.
Start with the trial.
Fourteen days, every feature, no card.