# Stack AI Pricing in 2026 and What Each Plan Costs By Femi Adegoke · 2026-10-29 · Source: https://www.activepieces.com/blog/stack-ai-pricing-in-2026-and-what-each-plan-costs --- Stack AI sells access by plan tier. It has a low-cost entry plan and a custom-quoted top tier, and the tier you land on is set by run volume, seats and deployment needs, much as it is with other workflow tools such as [Activepieces](https://www.activepieces.com), rather than by the monthly fee. **Prices change, so confirm them before you commit**; the figures here carry the date 2026-10-29. The entry plan is the cheap one, and the highest tier has no listed price: you ask sales and negotiate the number. Treat the listed fee as a floor, not a forecast. ![Small tag on a big closed door](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/3a5e5be4-69e5-4b23-9aa0-9387275aac5d/stack-ai-pricing-in-2026-and-what-each-plan-cost-24452cac.webp) Stack AI is a platform for building AI workflows and agents in a visual editor and then publishing them as internal tools or API endpoints. Because it's a hosted builder, **the vendor meters your usage**, which is why **the tier matters more than the fee**. ## Stack AI plan tiers and pricing ### The unit the bill is built on Start with what the vendor meters: - workflow runs - the seats that can build or edit - where you may deploy the result Pay the monthly fee and you get only entry to a bundle of ceilings on those three. A team that runs a workflow thousands of times a day will hit the run ceiling long before the fee feels expensive, so the next tier up becomes the real price. ![Visual workflow editor with agent boxes, API endpoint and usage meter](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/fd7ec50d-8917-45dd-beca-c369b9856c6b/stack-ai-pricing-in-2026-and-what-each-plan-cost-e5f5123e.webp) A team with few runs but many reviewers will hit the seat limit first, and the same fee suddenly buys much less. Look at any tier table from an automation tool and the pattern is clear. On [Activepieces](https://www.activepieces.com)' pricing page, Free and Plus stop at 5 users, Team at $200 a month includes 25 users and SSO, and audit logs and SCIM wait for the custom-priced Ultimate tier, so each row is a gate you may or may not need. ![Activepieces pricing page with four subscription tiers showing features and monthly costs](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/5780ea9c-6ecc-45f7-99f2-8707dfb01930/vercel-pricing-in-2026-how-the-costs-scale-scree-22533578.webp) Read Stack AI's page the same way: find the row your workload crosses first, then price the tier that clears it. ## Stack AI plans, prices, and limits The row that matters is the one the page doesn't print. Stack AI's public page gives a $0 entry price and few published limits, so you have to ask the vendor to price the metered unit, runs. ### Stack AI pricing table and check date If you want to know why a check date matters, [Gravity's snapshot history](https://gravity.fast/blog/stack-ai-pricing-history/) is the evidence. Across 18 captures of the page, 7 showed full prices in 2024-25, so a quote from that period may describe a price list that no longer exists. One capture shows the display changing, the moment the layout shifted. Ten showed only $0, so more than half the time a reader saw the free tier and nothing above it. Read the table below as a checklist of questions to put to sales, not as a finished price list; it records only what the page states. | Plan | Monthly price | Annual price | Included runs | Seats/projects | Knowledge-base limits | Support | SSO/on-premise | |---|---|---|---|---|---|---|---| | Free | $0 | not published | not published | not published | not published | not published | not published | | Paid tier | not published | not published | not published | not published | not published | not published | not published | | Enterprise | not published | not published | not published | not published | not published | not published | not published | According to [Gravity](https://gravity.fast/blog/stack-ai-pricing-history/), Stack AI's public page gives a $0 entry price and few published limits, which means you can start free but risk hitting undocumented limitations. Every other cell is a number you must get in writing before comparing tiers. ![What Stack AI's pricing page displayed over time](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/e65adbc3-3067-4b20-a931-b85d530ffaaf/stack-ai-pricing-in-2026-and-what-each-plan-cost-27c51a23.svg "Source: Gravity") ### Stack AI pricing details left unpublished Without run volume, which Stack AI meters and doesn't publish, you can't divide a monthly fee by runs to get a per-run cost, so you can't compare two quotes. Seats, knowledge-base size and SSO or on-premise deployment are also blank. If your workload needs any of them, assume it pushes you off the entry tier. Ask which limit forces the upgrade, then price that tier. ## Stack AI costs at realistic usage At realistic usage, the Free plan covers a solo prototype. A team or a department hits a seat limit or a run limit first and pays for whichever tier lifts it. The table below sets each scenario's usage against the Free allowance, so you can see which limit breaks first and which tier that points to. | Scenario | Assumed monthly runs | Plan allowance (Free: 500 runs, 1 seat) | Fitting plan | Monthly cost | Assumptions | |---|---|---|---|---|---| | Solo prototyper | A few test runs a day | Inside 500 runs, one seat | Free | Nothing | One builder, no sharing, no production traffic | | Five-person support team | Steady daily use by five people | Runs may fit, but one seat does not | A paid tier with multiple seats | That tier's listed fee | Seats bind before runs | | Department document workflow | Set by document intake, so it grows with volume | Run cap is the pressure point | A tier with higher run volume | Depends on the run ceiling you need | Runs bind first; deployment needs may add a second gate | The cost column shifts from a fixed fee to a volume-driven one as you move down the rows, so the sticker price tells you least in the last scenario. Testing a flow as a single builder keeps you well inside 500 runs and on the one seat. Nothing here forces an upgrade, so the monthly fee is zero until you share the work or put it in front of real traffic. For a five-person assistant, the one-seat Free limit fails before the run count does. Five people need access, so the seat cap sets the tier, and the price you compare is the cheapest plan that adds seats, not the one with the biggest run allowance. ![One seat on a Free plan card against five chairs](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/260d7529-76da-4eac-a151-39f751af971e/stack-ai-pricing-in-2026-and-what-each-plan-cost-c14e6420.webp) In a department-scale workflow, every incoming document is a run, so volume tracks business activity rather than headcount. **The run ceiling decides the plan**, and if the workflow must sit inside your own environment, deployment options can decide it too. Price that ceiling before you read the monthly fee. ## Hidden costs and limits Stack AI buyers hit Four places hold the extra cost. These are the model tokens your flows consume, the runs your tier allows, the features held back for higher tiers, and the work of moving out later. ### LLM usage and bring-your-own-key When a workflow step calls a language model, the model provider meters it in tokens, a separate unit from Stack AI's own run count. Find out whether your plan bundles model usage or expects your own API key. With your own key, the provider bills you directly, so the Stack AI invoice understates the true monthly total, and a chatty multi-step flow can cost more in tokens than in platform fees. ### Run caps and overages Here the metered unit is the run, one execution of a workflow. Stack AI's published prices show why this is hard to pin down: Starter at $199 a month and Team at $899 a month appeared in snapshots from January 2024 to January 2025, while snapshots from May 2025 show no published figure for either, making it impossible to determine current pricing from their website. Free stays at $0, meaning you always have a zero-cost way to test Stack AI. With no list price to anchor on, the run allowance and overage rate have to come from a written quote, not the pricing page. Ask what happens at the cap: whether runs stop, or keep going at a per-run rate you haven't seen. If a security review needs a particular deployment model, or a team needs more seats than your tier includes, the real price is the next tier up. Seats and deployment options are the other gates. Check your must-haves against the tier that has them, not the one you priced first. Don't expect workflows and knowledge bases built inside a vendor's builder to move out as portable code. Treat migration as a rebuild: hours to recreate each flow, plus re-indexing every document. Multiply that by your team's hourly cost and add it to the first year's bill. ## Stack AI against its closest alternatives on cost With that labor on the bill, Stack AI costs more than self-hosted Flowise or Dify, and it only comes out cheaper if setup time is your real expense. ### Stack AI cost comparison table with alternatives Before any price, the table lists the unit each vendor meters, since that unit decides which limit you hit first. Take from it which tools let you remove a limit by hosting the software yourself and which only let you buy a higher tier. Read the entry price from each vendor's page on the day you decide, because these change. | Tool | Entry paid price | Billing unit | Free tier | Self-hosting | Custom pricing | Check date | Best for | |---|---|---|---|---|---|---|---| | Stack AI | Monthly plan, see vendor page | Workflow runs | Limited | Enterprise arrangements | Yes | 29 Oct 2026 | Teams deploying internal assistants without engineers | | Flowise | Monthly plan, see vendor page | Predictions | Yes | Yes, open source | Yes | 29 Oct 2026 | Developers who can run their own server | | Dify | Monthly plan, see vendor page | Message credits | Yes | Yes, community edition | Yes | 29 Oct 2026 | Teams wanting open code with a hosted fallback | | Relevance AI | Monthly plan, see vendor page | Credits per action | Yes | Not on standard plans | Yes | 29 Oct 2026 | Sales and operations agents | | Lindy | Monthly plan, see vendor page | Credits per task | Yes | No | Yes | 29 Oct 2026 | Individuals automating inbox and calendar work | | Activepieces | $20 a month (Plus) | Credits | Yes, $0 with 1,000 credits a month | Yes, MIT-licensed Community Edition | Yes | 23 Oct 2026 | — | ### Where Stack AI is cheaper or dearer Where self-hosting exists elsewhere, Stack AI is dearer, because Flowise and Dify let you swap a subscription for server upkeep. Where the alternative is your own engineer's time, it's cheaper, since the hosted builder and deployment options come already assembled. Metering also differs: a run is a whole workflow, while a credit may be a single step, so one long workflow can cost several credits elsewhere and one run here. Activepieces' pricing page counts a flow run as 1 credit however many steps the flow has, where Zapier's page bills per task and Make's per module. Splitting a flow into ten small steps therefore adds nothing to the bill compared with squeezing it into two, with AI steps drawing extra credits on top. If you need self-hosting, don't let price decide, because only Flowise and Dify offer it without an enterprise negotiation. The same goes for a workload built around a single-person task, where Lindy's unit fits better than any seat-based plan. The next section turns this into a method for pricing your own limit. ## Where Activepieces fits next to Stack AI Choose Activepieces for app-to-app automation and Stack AI for building agents and document workflows; the deciding difference is that Activepieces publishes its monthly allowance on every self-serve plan: 1,000 credits on Free, 10,000 on Plus and 50,000 on Team. ![How many credits each Activepieces cloud plan includes](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/d292b01b-a818-4361-963c-6df874401565/stack-ai-pricing-in-2026-and-what-each-plan-cost-cc3036b8.svg "Source: Activepieces") If the work is an agent that reads documents and reasons over them, Stack AI is the closer fit. Activepieces is built around connecting apps, which is where its 746 integrations count, so you would be bending it toward a job it wasn't designed for. ### When the job is app-to-app automation Credits against runs: the table below sets the [Activepieces](https://www.activepieces.com/pricing) cloud plans, at $0, $20 and $200 a month, beside Stack AI's free tier. It shows that the two meter different units, so you can't compare their allowances number to number. ![Factory AI Pricing in 2026 and What Each Plan Costs](https://ap-marketing-media.fra1.cdn.digitaloceanspaces.com/uploads/f25d4d0a-a175-4163-84f4-abe3ab7d5e23/stack-ai-pricing-in-2026-and-what-each-plan-cost-82abfeed.webp) | Plan | Price | Monthly allowance | Billing unit | Best fit | |---|---|---|---|---| | Activepieces Free | $0 | 1,000 | Credits | Testing a first flow | | Activepieces Plus | $20 | 10,000 | Credits | A small team's recurring automations | | Activepieces Team | $200 | 50,000 | Credits | Many flows running at once | | Stack AI Free | $0 | 500 | Runs | Trying an agent before paying | Per [Activepieces' pricing page](https://www.activepieces.com/pricing), Free includes 1,000 credits, so you can prove a flow works but not run it for long. Plus gives 10,000 credits for $20, which is $0.002 a credit, so you need to estimate your usage volume to calculate total cost. Team gives 50,000 for $200, or $0.004 a credit. **Team is therefore not a volume discount**: whatever the extra $180 buys, it's not cheaper credits, so larger quantities cost more per credit. Stack AI and Activepieces can split the work. Stack AI handles the agent or document step, and Activepieces moves the result between your other apps at 1 credit a run however many steps the flow has. Each then bills in its own unit, so you price two limits, not one. The next section shows how. ## Stack AI buying considerations **Before buying Stack AI, find which limit your workload hits first (run volume, seats or deployment option) and price that tier, rather than comparing monthly fees.** Five steps get you there, in this order, because each feeds the next: 1. Count the runs in one real week and scale that count to a month, so the volume limit is tested against your actual traffic. 2. Get in writing who pays for model usage, so you know whether the model provider's charges sit inside the plan or arrive as a second bill. 3. Ask sales for the limits the pricing page leaves out, since a limit you can't see is one you can't budget for. 4. Trial the cheapest tier that seems sufficient, so an upgrade is a decision you make with evidence. 5. Set a date to review the first invoice, which turns a surprise into a scheduled check. The three steps most likely to go wrong are below. Pull one ordinary week from your logs, not a launch week. Count each time a workflow starts, since a run is the unit being metered. Multiply to a month, then add headroom for the busiest week you can remember. A plan that fits the average and fails the peak will cost you overage or a forced upgrade. Ask sales what happens at the run cap: throttling, overage rates or a hard stop. Ask whether seats include read-only reviewers, and which deployment options sit in which tier. Ask whether model calls are billed through Stack AI or directly by the model provider. Get the answers by email, because a verbal answer isn't a price. Put the first-invoice review on the calendar before you sign. Compare the invoice with your run estimate line by line. If the gap is large, you have found your binding limit, and you can price it before the next renewal. ## Frequently asked questions Where the pricing page publishes nothing, the answers below say "page is silent" instead of guessing, because an unpublished limit is one you have to price by asking. ### Plans and billing Does Stack AI have a free plan? Yes, the pricing page lists a Free plan at $0 per month with 500 runs per month. Until a limit is written down, **treat any free tier as a trial**, not a place to host a workload, because you can't tell which ceiling you would hit first. Is Stack AI billed monthly or annually? The page is silent on billing cadence and on any annual discount. Ask before committing, since an annual term fixes your tier for twelve months. If your run volume or seat count grows mid-term, you carry that cost until renewal. ### Model usage and deployment Does Stack AI charge for the underlying LLM usage? The page is silent on whether model usage is bundled into the plan or billed separately. Every run that calls a model consumes tokens, so the answer decides whether you have one metered line (runs) or two (runs plus tokens). Get it in writing before you compare monthly fees. Can Stack AI be self-hosted? The page is silent on self-hosting and on-premise deployment. The article's argument is that deployment options are gated by plan tier, so if your security team requires one, ask which tier unlocks it. That tier, not the entry price, is your real starting point. ### Cancelling or downgrading How do you cancel or downgrade a Stack AI plan? The page is silent on cancellation terms, notice periods and downgrade rules. Ask what happens to your seats and run allowance if you move down a tier mid-term. A downgrade that removes capacity you already depend on is a cost you should know about before you sign. ## Related reading - [n8n Business Plan Pricing: What It Costs in 2026](https://www.activepieces.com/blog/n8n-business-plan-pricing-what-it-costs-in-2026) - [Cursor Business Plan Pricing in 2026: Costs vs Pro](https://www.activepieces.com/blog/cursor-business-plan-pricing-in-2026-costs-vs-pro) - [Factory AI Pricing in 2026 and What Each Plan Costs](https://www.activepieces.com/blog/factory-ai-pricing-in-2026-and-what-each-plan-costs) ## References - [Gravity](https://gravity.fast/blog/stack-ai-pricing-history/) - [Activepieces](https://www.activepieces.com/pricing)