Sai Review (2026): Pricing, Features & Honest Verdict

Sai is a computer-use agent from Simular that operates cloud or local desktops for you, clicking through browsers and apps that have no API. Verdict: serious research and a fair $50 entry plan, undercut by an unpublished credit rate card and untidy legal pages. Best for: operators with recurring desktop busywork. Price: From $50/mo (free plan: yes). Rating: 7/10

What is Sai?

We found Sai at rank 2 on the Product Hunt board for 21 September 2026, under the tagline “The autonomous computer fleet at your command”. Sai is a computer-use agent. You describe a job in plain English, and it works a real desktop the way a person would: it reads the screen, moves the pointer, clicks buttons and types into forms. That matters because a lot of business software has no API at all. Old desktop apps, internal portals and vendor dashboards are all fair game if a human can click through them. Sai runs either on a cloud computer that Simular hosts for you or on your own Mac or Windows machine, and it pings you on iMessage, SMS or Telegram when a step needs your approval.

The company behind it is Simular Inc., a Delaware corporation according to its licence agreement. Its About page lists a $21.5M Series A in December 2025 from investors including Felicis and NVIDIA’s NVentures, and an invitation from Microsoft to pilot Windows 365 for Agents. Simular also maintains Agent S, an open-source computer-use framework under Apache-2.0 that had 12,335 GitHub stars when we checked. Product Hunt shows four earlier launches from the same team since March 2025. We have not run Sai ourselves. This review is based on sai.work, simular.ai, both pricing pages, the API documentation, the privacy policy, the OSWorld 2.0 write-up and the GitHub API.

What Are Sai’s Key Features?

Whole-desktop control, not only a browser tab

Most agents you can buy today live inside a web page. Sai works across the operating system: desktop apps, browsers, the file system and the terminal. Simular’s pitch is “If you can click it, Sai can.” At Microsoft Build 2026 the company showed Sai processing claim forms overnight inside a legacy line-of-business application. It read the scanned forms, checked coverage and typed the results into the UI with no API involved. For anyone whose worst chores sit in software that was never designed for integration, this is the reason to look at Sai before a browser-only agent.

Cloud computers that keep working after you close the laptop

On a paid plan Sai gets its own Windows or Linux cloud computer, and the Pay as you go plan lets you run up to five of them at once. The machine is persistent. Your logins, preferences and setup survive between sessions, so a Monday report does not start from a blank desktop each week. If you would rather keep everything local, the bring-your-own-device mode runs Sai on a Mac mini, a Mac or a Windows PC, and only the AI usage is billed. One gap: the current pricing page offers Windows and Linux cloud machines only, so Mac-only workflows mean supplying your own hardware.

Teach it once, then rerun it on a schedule

Simular’s research angle is what it calls a neuro-symbolic approach. The first time Sai completes a task, it writes the solution down as code in Simulang, the company’s scripting language for desktops, and later runs replay that code instead of reasoning from scratch. The claim is that the hundredth invoice costs less than the first and fails less often. Sai also supports skills, which are reusable instructions a team can share. We could not measure the cost curve, so treat it as a vendor claim. But the design makes sense, and it is the main thing separating Sai from agents that re-think every run.

An HTTP API and CLI with candid documentation

Developers get a REST API at api.sai.simular.ai, a command line tool called sai, and long-lived API keys for servers and CI jobs. There is also a Claude Code mode, where Sai drives your Claude Code account on a cloud desktop and checks the result visually. The docs are blunt about limits, which we like. Sending a message is capped at 60 an hour and file uploads at 30. Every API client on a machine shares one conversation. And one warning reads “You still cannot abort or restart your own work”, followed by advice to set a client-side timeout instead. That is a real gap for unattended automation, and it is rare to see a vendor print it.

How Much Does Sai Cost?

Sai starts free, and paid plans start at $50 a month. The free Explore tier gives a daily credit allowance and limited access to a cloud Windows computer, enough to build and test a first workflow. Pay as you go is $50 a month for 50,000 credits, which the page describes as $50 of usage covering both AI models and computer time. Cloud computers bill only while they run, and you can top up any time. Sai Unlimited is $500 a month for unlimited AI usage under a fair-use policy, with a note that heavy users may be routed to more efficient models until the next billing date. Enterprise is custom and adds SSO, role-based access and SLA guarantees.

For context, Anthropic’s Claude Pro costs $20 a month, or $17 a month on the annual plan, and lists task scheduling and Claude in Chrome among its features. Microsoft Power Automate charges $15 per user a month for attended desktop flows and $150 per bot a month for unattended ones. So Sai’s $50 sits above a chat subscription and well below a classic unattended RPA bot. The catch is that $50 is a usage allowance, not a flat fee, and how far it goes is hard to predict. No annual option is listed.

What Does a Sai Credit Actually Buy?

By the plan’s own math, 1,000 credits equal $1. What nobody tells you is the exchange rate on the other side. We searched the pricing page, the homepage, the API docs and the business pages, and found no price for an hour of cloud computer time or for a model call. Even Sai Unlimited keeps the cloud computer “metered by running time”, so the word unlimited covers AI usage only. This is the same problem we flag on any credit-priced tool: the number is public, the meaning is not.

The only public cost figure sits in Simular’s own benchmark post. On OSWorld 2.0, Sai’s API cost averaged $15.70 per task. Our arithmetic: at that rate the $50 plan covers about three tasks. That is unfair as a typical case, because those tasks take a skilled human more than an hour and Simular says repeat runs get cheaper. But it is the only anchor on offer. Meter a real workflow on the free tier before you pay, and watch the usage display closely in the first week.

That post deserves a careful read for another reason. The headline 73% is a partial-credit score. The binary success rate, where a task either passes or fails, was 28.25%, against 23.14% for the best rival listed. Simular leads on both measures and reports a per-task cost about a third lower than the two frontier models it compares against. Still, roughly seven in ten long tasks did not finish cleanly. The company says as much, writing that benchmarks report success across attempts while “real work demands consistent success every time”. Credit to Simular for publishing both numbers.

Do Sai’s Pricing and Legal Pages Agree With Each Other?

Not yet. Simular has two live pricing pages. The current one at sai.work lists Explore, Pay as you go and Sai Unlimited. An older one at simular.ai/pricing still shows a Starter plan at $50 crossed down from $200, a Premium plan at $200 that no longer exists, a note that access is “Invite only”, and a FAQ that mentions a Plus plan neither page sells. The licence agreement on simular.ai goes back further still, with a refund clause about “the $20 monthly fee”. A search engine can land you on any of the three. Trust the sai.work page, and screenshot it when you subscribe.

Then there is the footer of sai.work, which links to a Terms of Use page. When we opened it on 21 September 2026, it contained the heading “Terms” and no text. The privacy policy, last updated March 2026, is complete. It says Simular may use your inputs and outputs to train its models unless you opt out by emailing support, and it lists screenshots of pages you interact with among the data collected. Data that arrives through Google APIs is excluded from training.

Now compare that with the business pages, which show SOC 2 Type II and HIPAA badges and promise “zero data retention” plus bring-your-own-key encryption. Those terms may well apply under an enterprise contract. A self-serve buyer on the $50 plan gets the privacy policy instead, and we found no trust centre or audit report linked from either business page. If Sai will touch customer data, ask for the paperwork first.

Who is Sai Best For?

Use Sai if your week includes the same multi-app chore again and again, and at least one of those apps has no API. Think pulling figures from a vendor portal into a spreadsheet, filing invoices, updating a CRM from a legacy desktop tool, or rebuilding a monthly report. Founders and operators who cannot justify an RPA consultant are the natural fit, and the phone approvals make it practical to supervise from anywhere. Developers who want an agent to click through a preview build and hand visual bugs back to Claude Code have a good reason to try it too.

Skip Sai if you need a fixed monthly bill, because the credit model cannot give you one today. Skip it if your automation must be cancellable through the API, if your workflows need a hosted Mac, or if your compliance team will not start a pilot while the public terms page is empty. And if everything you automate already has an API, a workflow tool will be cheaper and more predictable than any agent that drives a screen.

Best Sai Alternatives

Claude from Anthropic is the mainstream option. Its pricing page says Claude Cowork is now just Claude, rolling out to Pro and Max. Pro costs $20 a month, or $17 a month on the $200 annual plan, and lists task hand-off, scheduling and Claude in Chrome. Max starts at $100 a month. You get a flat price and a polished product. You do not get a persistent cloud desktop you can watch, or Simular’s focus on replaying learned tasks as code.

Microsoft Power Automate is the traditional route for desktop automation. Premium is $15 per user a month, paid yearly, and covers attended desktop flows. Unattended bots cost $150 per bot a month, or $215 with a virtual machine that Microsoft hosts. Flows are scripted step by step and do not reason about new goals, which makes them predictable and also brittle when a screen changes. In exchange you get a fixed price, mature governance and a vendor your IT team already has a contract with.

Agent S is Simular’s own open-source framework, and the free do-it-yourself path. It is Apache-2.0 licensed, had 12,335 stars and 1,449 forks when we checked, and was last pushed to on 5 September 2026. Simular says a version of it was the first agent to pass human performance on the original OSWorld benchmark. You bring your own model keys, your own machine and your own engineering time, and you get none of Sai’s scheduling, approvals or cloud desktops.

Final Verdict: Is Sai Worth It?

Yes, with a meter running. Simular has real research behind it, funding, a Microsoft partnership and a product that reaches software other agents cannot touch. The free tier is a fair way in, the $50 plan is priced for individuals, and the documentation is more honest about its limits than most. If your work is repetitive and trapped behind graphical interfaces, Sai is one of the few tools built for exactly that problem.

But the commercial side has not caught up with the research. You cannot look up what an hour of computer time costs, three generations of pricing are live at once, the terms page is empty, and the privacy default allows your inputs and outputs to train the models unless you email to opt out. None of that is fatal, and all of it is fixable in an afternoon. Start on the free tier, time one real workflow, opt out of training on day one, and upgrade only when you know what a month of your own work costs. We rate Sai 7 out of 10.