You get every Stack AI price figure I have on record, with the month it sat on the page. 18 monthly snapshots, two changes to the price set. On 11 September 2026 the page showed a $0 plan with 500 runs a month, 2 projects and 1 seat, and no figure on the paid tiers. Extraction is automated and every row links to the archived page it came from.
What changed, and when
January 2024 to January 2025 is one set, $0, $199 and $899 a month across seven snapshots, with Free, Starter, Team and Enterprise / Academia named. April 2025 shows the same three numbers without the per-month suffix, a display change on a single snapshot. From 16 May 2025 the figures stop: ten snapshots through 11 September 2026 return $0 and nothing else. So for the last sixteen months the snapshots record plan names only. That is still worth dating, because I can say exactly when $199 and $899 stopped appearing on the page even though there is no current figure to quote.
| Period | Plan prices seen | Plan names readable on the page | Confirmed by | Source |
|---|---|---|---|---|
| to January 2025 | $0/month, $199/month, $899/month | Free, Starter, Team, Enterprise / Academia, Unlimited runs*, Unlimited team members | 7 snapshots | archived 2024-01-14 |
| $0, $199, $899 | Free, Starter, Team, Enterprise/Academia, Team members | 1 snapshot | archived 2025-04-16 | |
| to September 2026 | $0 | Free, Enterprise, Team members | 10 snapshots | archived 2025-05-16 |
Prices are the plan figures my monthly snapshot found on the page, normalised (no thousands separators); a new row starts when that set changes, so a row can be a display change rather than a price move. Extraction is automated: 1 of the 3 rows rest on a single snapshot and may be extraction noise. Plan names are the short labels the extractor could read; page furniture is dropped. Click the archived page before quoting a row. Currency and billing period follow the page's default at the time.
How to read this page
Click the archived page before you quote the old $199 and $899 figures; they are historical, not current. The currency is the page default on that date. The AI agent pricing index carries today's row, including the tools that publish nothing.
Cite this page. "Stack AI pricing history 2024 to 2026", Gravity, updated 15 September 2026, https://gravity.fast/blog/stack-ai-pricing-history/. Data CC BY 4.0. The full table for all tracked tools is in the AI agent pricing index.
FAQ
1. What does Stack AI cost right now?
Paid tiers not shown with a figure on the page. Free tier: Yes, $0: 500 runs a month, 2 projects, 1 seat. Billing unit: Runs per month, seats. Read on 11 September 2026; the pricing index carries the current row for every tool.
2. How many times has Stack AI changed its prices since 2024?
2 changes in the plan-price set across 18 monthly snapshots from January 2024 to September 2026. Each row above links to the archived page it came from.
3. Where does this data come from?
From the Wayback Machine's monthly captures of www.stack-ai.com/pricing, extracted by a script and checked against the live page. The table is released under CC BY 4.0: reuse it with a link to this page.
Sources
- Stack AI pricing page, read 11 September 2026.
- Wayback Machine captures of the same page, monthly from January 2024, linked per row above.
- The full period data for every tracked tool: ai-agent-pricing-data on GitHub (CC BY 4.0).
Pricing history for other tools
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