How is the AI tool price index calculated?

As a Jevons index over a fixed basket: only tools observed continuously from the first to the last measurement day count (62 of 75). For each tool we form the ratio of current to starting price, then take the geometric mean. Currencies are calculated separately, without conversion.

May I use this pricing data?

Yes. All data is published under CC BY 4.0 and may be used freely, including commercially. The only condition is attribution to "KI-Radar (ki-radar.net)" with a link. CSV and JSON downloads are available at ki-radar.net/en/daten.

Home/AI tool price index

Original measurement series · daily

Are AI tools getting more expensive?

We measure the entry prices of 75 AI tools every day and derive a price index – over a fixed basket, calculated separately per currency. The USD entry prices of the 42 continuously monitored AI tools are unchanged since 28 September 2026.

Measurement period: 28 September 2026 – 24 October 2026 · Methodology · Download the data →

±0.0 %

Price movement USD since start

Index 100.0 (base 100)

0.0 %

of tools changed their price

0/62

0↑ 0↓

increases vs. decreases

0 changes total

—

median change per step

absolute value

Development

The index over time

Each currency has its own basket and its own base. A value above 100 means the average entry price is higher than on the first measurement day.

EUR (€)20 tools in the basket

Price index EUR · base 28 Sept = 100 · currently 100.0

USD ($)42 tools in the basket

Price index USD · base 28 Sept = 100 · currently 100.0

Ticker

Every measured price change

So far no monitored tool has confirmed a change to its entry price. Subscribe via RSS. You can filter the list by category on What changed?, and only the cuts are shown on Deals.

Reuse

Cite the numbers, download the data

These numbers are our own measurements, published under CC BY 4.0 – free to use, including commercially, with attribution.

KI-Radar, "AI Tool Price Monitor", as of 2026-10-24, ki-radar.net/en/ki-tool-preise (CC BY 4.0)

ki-tool-preisindex.csv · ki-tool-preisaenderungen.csv · all datasets

Methodology

How the index is calculated

The index follows the Jevons method: for each tool we form the ratio of current to starting price, then take the geometric mean. A doubling from €5 to €10 therefore weighs as much as one from €50 to €100 – the index measures price movement, not price level.

Fixed basket: only the 62 tools observed continuously from the first to the last measurement day. 13 tools are excluded because they joined later or dropped out temporarily.
Currencies are never converted. A combined EUR/USD index would report exchange-rate movements as price changes.
We measure the cheapest regularly bookable paid tier, monthly billing, list price without discounts.
A new price only counts as a change after several stable measurement days – this filters mis-measurements but delays real changes by a few days.

Limits: The index covers 27 measurement days. That is enough to say what has moved since measurement began, but not yet a statement about the year. The series grows daily.