AEO for text-to-speech APIs: AI search visibility ranking
How AI search engines rank text-to-speech APIs by visibility and citations. 20 brands measured quarterly across Google AI Mode: which brands the AI names in answers, which domains it cites as sources, and how the leaders compare. Text-to-speech APIs used by product teams to generate natural voice output for apps, assistants, accessibility, and media workflows. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
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When buyers ask AI engines about Text-to-speech APIs, Google Cloud leads the conversation. It shows up as the top brand in 50.0 percent of answers, highlighting its prominence. Other contenders like ElevenLabs and OpenAI also appear frequently, but they don't match Google Cloud's visibility.
The rankings are shaped by where AI engines pull their information. Google.com and edenai.co are among the top-cited sources, acting as aggregators. They compile reviews and insights, making them authoritative references that aid AI engines in identifying leading brands.
For buyers, the importance of recent reviews and third-party validation cannot be understated when choosing a brand. AI engines prioritize these aspects, along with topical authority. Brands recognized often in respected sources may be better positioned to meet buyer needs in the Text-to-speech API category.
At a glance
What we observed in this category
Google Cloud and ElevenLabs share the top visibility score of 50%, yet both carry a citation rate of 0%, giving them composite scores of 35.0. OpenAI sits just behind at 37.5% visibility but is the only brand in the top five to earn any citations at all, recording 25% citation against a category average of just 1.2%. That citation gap matters because it means OpenAI is not only named in AI Mode responses but also trusted enough to be sourced, a distinction none of the other leading brands currently hold.
The divergence between being named and being cited is the defining pattern in this category. Google Cloud, ElevenLabs, Cartesia, and Amazon Polly all appear in AI Mode responses at rates well above the 10.6% category average yet receive zero citations, meaning the AI describes them without anchoring any claim to their own domains. Microsoft Azure fell from 37.5% visibility to 0% and lost 12.5 citation points in the same period, suggesting its AEO presence has essentially collapsed despite being a major platform brand.
Google AI Mode is the sole engine recorded across all 20 brands in this audit, and the top cited sources are third-party aggregators and benchmark sites, specifically google.com, edenai.co, haass.io, apiframe.ai, and benchlm.ai, rather than the brand domains themselves. This indicates that AI Mode is constructing its answers about text-to-speech APIs by drawing on comparison and review content rather than first-party product pages, which is the structural challenge any brand in this category must address to improve its answer engine optimisation standing.
Movers & shakers since last refresh
Biggest visibility risers
-
Amazon Polly 12% → 38% · rank #8 → #5+25pp
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OpenAI 25% → 38% · rank #5 → #3+12pp
Biggest visibility fallers
-
Microsoft Azure 38% → 0% · rank #4 → #7-38pp
-
ElevenLabs 75% → 50% · rank #1 → #2-25pp
-
Deepgram 25% → 0% · rank #3 → #16-25pp
The AEO ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
cloud.google.com
|
50% | 0% | Google AI Mode |
Google Cloud ties ElevenLabs at 50% visibility, nearly five times the 10.6% category average, yet records 0% citation, leaving its composite score at 35.0. |
||||
| 2 |
elevenlabs.io
|
50% | 0% | Google AI Mode |
ElevenLabs dropped from 75% to 50% visibility and lost 25 citation points period-on-period, making it the second-largest faller despite holding a joint top rank. |
||||
| 3 |
openai.com
|
38% | 25% | Google AI Mode |
OpenAI is the only top-five brand with a non-zero citation rate at 25%, giving it the highest composite score of 33.8 despite lower visibility than the two brands above it. |
||||
| 4 |
cartesia.ai
|
38% | 0% | Google AI Mode |
Cartesia matches OpenAI and Amazon Polly at 37.5% visibility but records 0% citation, yielding a composite score of 26.2, which is 7.6 points below OpenAI. |
||||
| 5 |
aws.amazon.com
|
38% | 0% | Google AI Mode |
Amazon Polly is the biggest visibility riser, climbing from 12.5% to 37.5% and moving from rank 8 to rank 5, though its citation rate remains at 0%. |
||||
| 6 |
lovo.ai
|
0% | 0% | Google AI Mode |
| 7 |
microsoft.com
|
0% | 0% | Google AI Mode |
| 8 |
speechify.com
|
0% | 0% | Google AI Mode |
| 9 |
murf.ai
|
0% | 0% | Google AI Mode |
| 10 |
wellsaidlabs.com
|
0% | 0% | Google AI Mode |
| 11 |
cereproc.com
|
0% | 0% | Google AI Mode |
| 12 |
papercup.com
|
0% | 0% | Google AI Mode |
| 13 |
descript.com
|
0% | 0% | Google AI Mode |
| 14 |
play.ht
|
0% | 0% | Google AI Mode |
| 15 |
rime.ai
|
0% | 0% | Google AI Mode |
| 16 |
deepgram.com
|
0% | 0% | Google AI Mode |
| 17 |
resemble.ai
|
0% | 0% | Google AI Mode |
| 18 |
readspeaker.com
|
0% | 0% | Google AI Mode |
| 19 |
ibm.com
|
0% | 0% | Google AI Mode |
| 20 |
hume.ai
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on text-to-speech APIs, these are the domains Google AI Mode cited most often. If you're not on this list — or if your competitors are — that's a concrete PR / linkbuilding target.
How to read this AEO ranking
Four things worth knowing before you act on the numbers above. These are the same definitions across every industry page — for category-specific observations, see the What we observed section above (where available) and the per-brand insights inline in the ranking.
Visibility = being named
A brand's visibility % is the share of AI answers that mention it by name in the response prose. This is who AI engines actively recommend to the buyer. More on visibility →
Citation rate = being trusted
Citation rate is the share of AI answers that include the brand's domain as a clickable source link. This is what the AI treats as authoritative evidence, different from being named. More on citation rate →
Top engine differs by brand
The "top engine" column shows which AI surface each brand performs best on. Big gaps between a brand's score across engines usually points to specific content or schema gaps. How AI engines pick sources →
AEO rankings move month to month
AI engines re-crawl and re-rank on shorter cycles than classical search. We re-audit every brand on this list at least every 90 days and refresh this page automatically. How AI search ranking works →
Run an AEO audit on your own text-to-speech APIs brand
The brands above were curated from public market-leader lists. Want the same answer engine optimisation measurement against your own brand — including the queries you appear on, which competitors get named instead, and a prioritised fix list? Run a free preview.
Frequently asked about AEO for text-to-speech APIs
Who leads AEO in Text-to-speech APIs?
Google Cloud and ElevenLabs share the highest visibility at 50%, but OpenAI leads on composite score when citations are factored in, as it is the only top-five brand with a non-zero citation rate of 25%.
What sources does AI cite most for Text-to-speech APIs research?
Google AI Mode anchors its answers to third-party aggregators and benchmark sites, with google.com, edenai.co, haass.io, apiframe.ai, and benchlm.ai appearing as the top cited sources rather than brand-owned domains.
Which brands have lost the most AEO ground in Text-to-speech APIs recently?
Microsoft Azure is the largest faller, dropping from 37.5% to 0% visibility and losing 12.5 citation points, while Deepgram fell from rank 3 to rank 16 with a 50-point citation loss.
Why do high-visibility brands in this category still have low composite scores?
Most top brands, including Google Cloud, ElevenLabs, Cartesia, and Amazon Polly, are named in AI Mode responses at above-average rates but receive 0% citations, meaning the AI describes them without sourcing their own content.
How does citation rate affect AEO performance in Text-to-speech APIs?
The category average citation rate is just 1.2%, and only OpenAI exceeds it at 25%, which translates directly into a composite score advantage of 7.6 points over brands with identical or higher visibility.
Which engine dominates AEO coverage in Text-to-speech APIs?
Google AI Mode is the only engine recorded across all 20 brands in this audit, making it the single most important surface for any answer engine optimisation strategy in this category.