57% of first choices, clear leader.
The floor is 12 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one can't be told apart from repeat variation, and both are shown. Each index measures its own floor from its own repeat, over its own categories, so the floor differs from one index to the next. How the floor is measured
Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.
“Verdict: Avoid completely unless you are a large enterprise with multi-product complexity, a massive budget, and a dedicated billing operations team.” Gemini 3.1 Pro, negative prompt
“Skip merchant-of-record options (Paddle, FastSpring) unless you sell self-serve globally” Claude Opus 5, paraphrase prompt
“Stripe Billing: It is described as developer-centric and API-first, so teams without strong engineering support may find it harder to operate” Perplexity Sonar Pro, negative prompt
“Chargebee for paid feature requirements ... I’d require a written feature-and-cost breakdown before committing” GPT-6 Astra, negative prompt
32 of 36 answers in this category came back with a source list, from 6 of 6 models: citations where the model returns them, or the search results it consulted. 567 links across 187 sites, every framing counted. Ranked by the number of answers carrying the site or page. None of the 36 answers across every segment cited this index's own page for the category.
The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.
| Company and products | Share | Own site cited | Name searches, Google | AI search demand, est. | Organic visits | Paid search a month, est. | Google ads, last 30 days | Best Google position |
|---|---|---|---|---|---|---|---|---|
| Chargebee chargebee.com | 57% | 198 | 5,400 | 140 | 69,891 | $1,889 | 82 | 7 |
| Stripe Billing stripe.com | 17% | 170 | 1,900 | 599 | 3,226,782 | $3,621 | 102 | 1 |
| Maxio maxio.com | 17% | 112 | 2,400 | 49 | 32,891 | $518 | 59 | |
| Paddle paddle.com | 4% | 88 | 60,500 | 69,116 | 172,079 | 31 | ||
| Zoho parent site Zoho Billing 4% | 4% | 60 | 18,100 | 29 | ||||
| Metronome metronome.com | 0% | 11 | 1,220,000 | 5,068 | 3,426 | $14 | 3 | |
| Orb withorb.com | 0% | 9 | 49,500 | 36,681 | 28,669 | $3,507 | 8 | 6 |
| Recurly recurly.com | 0% | 132 | 3,600 | 105 | 22,718 | $12,207 | 17 | 2 |
| Ordway ordwaylabs.com | 0% | 1 | 22,200 | 683 | 22,195 | $142 | 10 | |
| Zenskar zenskar.com | 0% | 1 | 720 | 9 | 1,849 | 0 |
Google's top ten for the two searches hold 16 sites; 6 of them are among the sites the models cited here (chargebee.com, recurly.com, solidgate.com, stripe.com, withorb.com, zoneandco.com). The first result for “best subscription billing platform” is salesforce.com.
| Prompt | Model | Version string | Time (UTC) | Searched | Sources | Latency |
|---|---|---|---|---|---|---|
| Direct recommendation | Claude Opus 5 | claude-opus-5 | 2026-09-09 19:28 | yes | 38 | 54 s |
| Direct recommendation | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 19:30 | yes | 29 | 80 s |
| Direct recommendation | GPT-6 Astra | gpt-6-astra | 2026-09-09 19:32 | yes | 4 | 24 s |
| Direct recommendation | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 19:33 | yes | 5 | 38 s |
| Direct recommendation | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:22 | yes | 7 | 46 s |
| Direct recommendation | Perplexity Sonar Pro | sonar-pro | 2026-09-09 19:31 | yes | 20 | 8 s |
| Paraphrase | Claude Opus 5 | claude-opus-5 | 2026-09-09 19:35 | yes | 21 | 64 s |
| Paraphrase | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 19:37 | yes | 27 | 53 s |
| Paraphrase | GPT-6 Astra | gpt-6-astra | 2026-09-09 19:38 | yes | 4 | 25 s |
| Paraphrase | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 19:39 | yes | 3 | 26 s |
| Paraphrase | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:24 | no | 0 | 37 s |
| Paraphrase | Perplexity Sonar Pro | sonar-pro | 2026-09-09 19:37 | yes | 20 | 7 s |
| Comparative | Claude Opus 5 | claude-opus-5 | 2026-09-09 19:43 | yes | 25 | 136 s |
| Comparative | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 19:45 | yes | 29 | 62 s |
| Comparative | GPT-6 Astra | gpt-6-astra | 2026-09-09 19:47 | yes | 8 | 43 s |
| Comparative | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 19:49 | yes | 6 | 42 s |
| Comparative | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:25 | no | 0 | 21 s |
| Comparative | Perplexity Sonar Pro | sonar-pro | 2026-09-09 19:46 | yes | 20 | 7 s |
| Budget constrained | Claude Opus 5 | claude-opus-5 | 2026-09-09 19:55 | yes | 40 | 143 s |
| Budget constrained | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 19:57 | yes | 33 | 53 s |
| Budget constrained | GPT-6 Astra | gpt-6-astra | 2026-09-09 19:58 | yes | 4 | 23 s |
| Budget constrained | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 19:59 | yes | 5 | 24 s |
| Budget constrained | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:29 | yes | 8 | 96 s |
| Budget constrained | Perplexity Sonar Pro | sonar-pro | 2026-09-09 19:57 | yes | 20 | 5 s |
| Scale constrained | Claude Opus 5 | claude-opus-5 | 2026-09-09 20:03 | yes | 38 | 117 s |
| Scale constrained | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 20:04 | no | 0 | 18 s |
| Scale constrained | GPT-6 Astra | gpt-6-astra | 2026-09-09 20:06 | yes | 4 | 38 s |
| Scale constrained | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 20:08 | yes | 6 | 65 s |
| Scale constrained | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:30 | no | 0 | 27 s |
| Scale constrained | Perplexity Sonar Pro | sonar-pro | 2026-09-09 20:04 | yes | 20 | 13 s |
| Negative framing | Claude Opus 5 | claude-opus-5 | 2026-09-09 20:11 | yes | 41 | 75 s |
| Negative framing | Claude Opus 4.8 | claude-opus-4-8 | 2026-09-09 20:13 | yes | 37 | 62 s |
| Negative framing | GPT-6 Astra | gpt-6-astra | 2026-09-09 20:15 | yes | 5 | 40 s |
| Negative framing | GPT-5.6 Sol | gpt-5.6-sol | 2026-09-09 20:18 | yes | 8 | 59 s |
| Negative framing | Gemini 3.1 Pro | gemini-3.1-pro-preview | 2026-09-10 17:31 | yes | 12 | 38 s |
| Negative framing | Perplexity Sonar Pro | sonar-pro | 2026-09-09 20:14 | yes | 20 | 5 s |
Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.
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